WO2011142007A1 - 内燃機関の可変動弁装置 - Google Patents
内燃機関の可変動弁装置 Download PDFInfo
- Publication number
- WO2011142007A1 WO2011142007A1 PCT/JP2010/058025 JP2010058025W WO2011142007A1 WO 2011142007 A1 WO2011142007 A1 WO 2011142007A1 JP 2010058025 W JP2010058025 W JP 2010058025W WO 2011142007 A1 WO2011142007 A1 WO 2011142007A1
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- WO
- WIPO (PCT)
- Prior art keywords
- output
- phase
- internal combustion
- combustion engine
- rotator
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
- F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/3445—Details relating to the hydraulic means for changing the angular relationship
- F01L2001/34453—Locking means between driving and driven members
- F01L2001/34469—Lock movement parallel to camshaft axis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/3445—Details relating to the hydraulic means for changing the angular relationship
- F01L2001/34453—Locking means between driving and driven members
- F01L2001/34476—Restrict range locking means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2305/00—Valve arrangements comprising rollers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2800/00—Methods of operation using a variable valve timing mechanism
- F01L2800/01—Starting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2800/00—Methods of operation using a variable valve timing mechanism
- F01L2800/03—Stopping; Stalling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2820/00—Details on specific features characterising valve gear arrangements
- F01L2820/04—Sensors
- F01L2820/041—Camshafts position or phase sensors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
- F02B75/18—Multi-cylinder engines
- F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
Definitions
- the present invention includes an output rotator for driving an engine valve and an input rotator for driving the output rotator, a function of changing a relative rotation phase that is a rotation phase of the output rotator with respect to the input rotator, and a relative
- the present invention relates to a variable valve operating apparatus for an internal combustion engine having a function of fixing an input rotary body and an output rotary body to each other when the rotational phase is a specific phase.
- variable valve operating device for example, the one described in Patent Document 1 is known.
- This variable valve operating apparatus is provided with a sensor for determining whether or not the input rotator and the output rotator are fixed to each other.
- a shake ratio that is a ratio of a shake amount in the positive direction and a shake amount in the negative direction with respect to the reference value of the output signal of the sensor is calculated.
- This shake ratio changes as follows depending on whether or not the input rotator and the output rotator are fixed to each other. That is, when both rotation pairs are fixed, the shake ratio takes a value equal to or less than a predetermined value.
- both rotating bodies are not fixed, the output rotating body swings with respect to the input rotating body, so that the shake ratio becomes larger than a predetermined value.
- variable valve system in the process of stopping the rotation of the internal combustion engine, when the shake ratio is equal to or less than a predetermined value, it is determined that the two rotary bodies are fixed to each other, and when the shake ratio is greater than the predetermined value, Judge that it is not fixed.
- the present invention has been made in view of such circumstances, and an object of the present invention is to provide a variable valve for an internal combustion engine that can accurately determine whether or not the input rotating body and the output rotating body are fixed to each other. To provide an apparatus.
- an output rotator that drives an engine valve and an input rotator that drives the output rotator, and changes a relative rotation phase that is a rotation phase of the output rotator with respect to the input rotator.
- a phase variation that is a change amount of the relative rotation phase The gist is to determine whether or not the input rotator and the output rotator are fixed to each other based on the amount.
- the relative rotational phase fluctuates.
- the fluctuation amount of the relative rotation phase in the non-fixed state is compared with the fluctuation amount of the relative rotation phase in the fixed state, the former is larger than the latter. That is, the amount of change in the relative rotational phase varies depending on whether the input rotator and the output rotator are in a fixed state or in an unfixed state.
- the determination can be performed accurately.
- the variable valve operating apparatus includes an input angle sensor that detects a rotation phase of the input rotator and an output angle sensor that detects a rotation phase of the output rotator, and an input angle that is a detection signal of the input angle sensor.
- the phase fluctuation amount may be calculated based on an output angle signal that is a signal and a detection signal of the output angle sensor.
- the variable valve apparatus may calculate the phase fluctuation amount based on a rising signal and a falling signal of the output angle signal detected by the output angle sensor.
- the output angle sensor is provided to detect a timing rotor including a first phase detection unit that forms the rising signal and a second phase detection unit corresponding to the falling signal, and further, the first phase detection unit Is provided in the vicinity where the variation amount of the torque becomes zero in the torque reduction process of the output rotator, and the second phase detection unit has the variation amount of the torque of 0 in the torque increase process of the output rotator. It may be provided in the vicinity.
- the amount of phase fluctuation when the output rotator fluctuates to the maximum in the retarded direction is obtained. Can be calculated.
- the falling signal is detected when the torque becomes zero in the process of increasing the torque of the output rotator, the amount of phase fluctuation when the output rotator varies to the maximum in the advance direction can be calculated.
- the variable valve operating device calculates the phase fluctuation amount based on a rising signal of the output angle signal detected by the output angle sensor, and the output angle sensor is a torque applied to the output rotating body. May be detected as the rising signal when the angle is switched from the retard direction to the advance direction.
- the output angle sensor detects when the torque applied to the output rotating body is switched from the retarded direction (the direction opposite to the rotating body) to the advanced angle direction (the forward direction of the rotating body). It is possible to detect the amount of fluctuation of the relative rotation phase of the output rotator relative to the rotator toward the retard side.
- the variable valve device calculates the phase fluctuation amount based on a falling signal of the output angle signal detected by the output angle sensor, and the output angle sensor is added to the output rotating body.
- the time when the torque switches from the advance direction to the retard direction may be detected as the falling signal.
- the output angle sensor detects the time when the torque applied to the output rotator switches from the advance direction (forward direction of the rotator) to the retard direction (opposite direction of the rotator). It is possible to detect the amount of fluctuation of the relative rotational phase of the output rotator relative to the body toward the advance side.
- the output angle sensor detects a first time when the torque with respect to the output rotator switches from the retard direction to the advance direction, and a second time when the torque with respect to the output rotator switches from the advance direction to the retard direction.
- the phase fluctuation amount may be calculated based on the first time and the second time.
- the phase variation amount is calculated based on the first timing related to the retard amount variation amount of the relative rotation phase and the second timing related to the advance amount variation amount of the relative rotation phase. Therefore, the phase fluctuation amount can be obtained more accurately.
- the variable valve operating apparatus may execute a determination as to whether or not the input rotating body and the output rotating body are fixed to each other when the internal combustion engine is in a stopping process. In the present invention, it is determined whether the engine is in a fixed state or an unfixed state in the process of stopping rotation of the internal combustion engine. For this reason, at the time of the next engine start, the start control according to the fixed state or the non-fixed state can be performed.
- variable valve gear performs a determination as to whether or not the input rotator and the output rotator are fixed to each other when the engine speed in the stop process of the internal combustion engine has decreased to a specified speed. Also good.
- the input rotator and the output rotator are fixed to each other at a later time in the stopping process of the internal combustion engine. If the same determination is made at an early stage in the stopping process of the internal combustion engine, it is assumed that both the rotating bodies are fixed to each other by the rotation of the input rotating body and the output rotating body. In this case, the determination is different from the actual fixed state of the input rotating body and the output rotating body. In this respect, since the present invention performs the same determination after the engine rotational speed has decreased to the specified rotational speed, the frequency at which the determination result differs from the actual fixed state of the input rotary body and the output rotary body Can be lowered.
- variable valve device determines that the input rotating body and the output rotating body are fixed to each other when the phase variation amount is smaller than a reference determination value, and the phase variation amount is greater than the reference determination value. May be determined that the input rotating body and the output rotating body are not fixed to each other.
- the reference determination value may be updated based on the input angle signal and the output angle signal when the output rotator and the input rotator are fixed to each other. There are individual differences in variable valve gears. That is, the degree of shaking of the output rotator with respect to the input rotator varies due to dimensional variations of the output rotator and the input rotator and variations in assembly of the output rotator and the input rotator.
- the reference determination value as to whether or not the output rotator is fixed with respect to the input rotator is based on the input angle signal when the output rotator and the input rotator are fixed to each other, and It is updated based on the output angle signal. Thereby, the above determination can be performed more accurately.
- the reference determination value may be updated based on the input angle signal and the output angle signal when the internal combustion engine is started and when the output rotator and the input rotator are fixed to each other.
- the input rotating body and the output rotating body are fixed to each other using the reference determination value when the engine is subsequently stopped. It can be determined whether or not.
- the reference determination value may be updated based on the input angle signal and the output angle signal.
- the reference determination value can be obtained under conditions closer to the time when the engine is stopped than when the internal combustion engine is started. As a result, it is possible to more accurately determine whether or not the input rotator and the output rotator are fixed to each other.
- variable valve operating device may delay the start timing of fuel injection when the internal combustion engine is started and when the relative rotational phase is not fixed, compared to when the relative rotational phase is fixed.
- the injected fuel is difficult to burn.
- the start timing of fuel injection at the time of engine start and in the non-fixed state is made later than that at the time of engine start and in the fixed state, for example, the amount of injected fuel adhering to the spark plug is reduced. can do.
- an output rotator that drives the engine valve and an input rotator that drives the output rotator, and the relative rotation phase that is the rotation phase of the output rotator with respect to the input rotator is changed.
- a variable valve operating apparatus for an internal combustion engine having a function of fixing the input rotating body and the output rotating body to each other when the relative rotational phase is a specific phase.
- the variable valve operating apparatus includes an input angle sensor that detects a phase of the input rotator and an output angle sensor that detects a rotation phase of the output rotator, and the output angle sensor is added to the output rotator.
- the output rotator is fixed to the input rotator.
- the gist is to determine that the output rotating body is fixed with respect to the input rotating body when the period variation amount is larger than a reference determination value.
- the relative rotational phase fluctuates when the output rotating body receives force from the engine valve.
- the fluctuation amount of the relative rotational phase when the output rotating body receives a force from the engine valve is smaller than that in the non-fixed state. That is, the amount of change in the relative rotational phase varies depending on whether the input rotator and the output rotator are in a fixed state or in an unfixed state. In the present invention, since it is determined whether or not the input rotator and the output rotator are fixed to each other based on the amount of period variation, the determination can be performed accurately.
- (A) is sectional drawing which shows the cross-section of the valve timing variable mechanism of the same embodiment
- (B) is sectional drawing which shows the cross-sectional structure which followed the AA line of (A).
- Sectional drawing which shows typically the positional relationship of the intake valve of the same embodiment, an intake cam, and a cam position sensor.
- the schematic diagram which shows the relationship between the displacement amount of an intake valve, the torque of an intake camshaft, the amount of phase fluctuations of an intake camshaft, and a detection part about the variable valve apparatus of the embodiment.
- standard relative rotation phase calculation process” performed by the electronic controller about the variable valve apparatus of the embodiment The flowchart which shows the procedure of the "fixation determination process” performed by the electronic controller about the variable valve apparatus of the embodiment.
- the timing chart which shows transition of the total phase fluctuation amount at the time of an engine stop about the variable valve apparatus of the embodiment.
- variable valve device of the present invention is embodied as a variable valve device for a V-type 6-cylinder internal combustion engine.
- the internal combustion engine 1 includes an engine main body 10 including a cylinder block 11, a cylinder head 12, and an oil pan 18, a variable valve operating device 20 including each element of a valve operating system provided on the cylinder head 12, an engine main body 10, and the like.
- a lubricating device 50 for supplying lubricating oil and a control device 60 for comprehensively controlling these devices are included.
- the cylinder 13 is provided with a piston 14 that reciprocates.
- the cylinder head 12 is provided with a fuel injection valve 16. The fuel injection valve 16 injects fuel into the intake port.
- the variable valve operating apparatus 20 includes an intake valve 21 and an exhaust valve 28 that open and close the combustion chamber 15, an intake camshaft (output rotator) 22 and an exhaust camshaft 29 that push down each of these valves, and a crankshaft (input rotator). And a variable valve timing mechanism 30 that changes the rotational phase of the intake camshaft 22 with respect to the rotational phase of 17 (hereinafter referred to as “valve timing VT”).
- the intake camshaft 22 is provided with three sets of two intake cams 23.
- the protruding directions of the three sets of intake cams 23 are different by 120 degrees.
- each of the three sets of intake cams 23 is referred to as a first intake cam 23A, a second intake cam 23B, and a third intake cam 23C.
- the lubrication apparatus 50 includes an oil pump 52 that discharges the lubricating oil from the oil pan 18, a lubricating oil passage 51 that supplies the lubricating oil discharged from the oil pump 52 to each part of the internal combustion engine 1, and the variable valve timing mechanism 30. And an oil control valve 53 for controlling the supply mode of the lubricating oil.
- the control device 60 includes an electronic control device 61 that performs various arithmetic processes for controlling the internal combustion engine 1 and various sensors such as a crank position sensor 80 and a cam position sensor 90. .
- the crank position sensor 80 outputs a signal corresponding to the rotation angle of the crankshaft 17 (hereinafter referred to as “crank angle signal CB”) to the electronic control device 61.
- the cam position sensor 90 is an output angle sensor that outputs a signal corresponding to the rotation angle of the intake camshaft 22 (hereinafter, “cam angle signal DB”) to the electronic control device 61.
- the cam position sensor 90 is configured as a magnetic sensor 90B.
- the magnetic sensor 90B is provided so as to detect the timing rotor 90A fixed to the intake camshaft 22.
- the timing rotor 90A includes a first detection unit 91 corresponding to the first intake cam 23A, a second detection unit 92 corresponding to the second intake cam 23B, and a third detection unit 93 corresponding to the third intake cam 23C. Including.
- the magnetic sensor 90B outputs a high level signal when detecting any one of the detection units 91, 92, 93, and outputs a low level signal when the detection units 91, 92, 93 are not detected. That is, the magnetic sensor 90B detects a rising signal when the advance angle side end 94 of the detection units 91, 92, 93 passes through the sensor 90B, and the retard angle side end 95 of the detection unit is the same sensor. When passing through 90B, a falling signal is detected. The rising signal has a faster response speed than the falling signal.
- the electronic control unit 61 calculates the following as parameters for use in various controls. That is, based on the crank angle signal CB and the cam angle signal DB, a calculation value corresponding to the relative relative rotation phase of the intake camshaft 22 with respect to the crankshaft 17 is calculated. Further, the injection timing of the fuel injection valve 16 is controlled based on the engine operating state.
- Control performed by the electronic control unit 61 includes valve timing control for changing the valve timing VT by control of the valve timing variable mechanism 30 and fuel injection control for controlling the injection mode of the fuel injection valve 16.
- the valve timing VT is set to the most advanced valve timing VT (hereinafter, “most advanced angle VTmax”) and the most retarded valve timing VT (hereinafter, “most retarded angle VTmin”) based on the engine operating state. )). Further, the valve timing VT is changed to the intermediate angle VTmdl when the engine is stopped. The intermediate angle VTmdl is at a specific timing between the valve timing VT and the most advanced angle VTmax and the most retarded angle VTmin.
- variable valve timing mechanism 30 The configuration of the variable valve timing mechanism 30 will be described with reference to FIG. Note that an arrow X in the figure indicates the rotation direction of the sprocket 33 and the intake camshaft 22.
- the variable valve timing mechanism 30 includes a housing rotor 31 that rotates in synchronization with the crankshaft 17, a vane rotor 35 that rotates in synchronization with the intake camshaft 22, and a valve timing VT. And a phase fixing mechanism 40 for fixing to the intermediate angle VTmdl.
- the housing rotor 31 includes a sprocket 33 connected to the crankshaft 17 via a timing chain, a housing body 32 that is assembled inside the sprocket 33 and rotates integrally with the sprocket 33, and a cover that is attached to the housing body 32. 34.
- the housing body 32 is provided with three partition walls 31 ⁇ / b> A that protrude toward the rotation axis (the intake camshaft 22) of the housing rotor 31 in the radial direction.
- the vane rotor 35 is fixed to an end portion of the intake camshaft 22 and is disposed in a space in the housing main body 32.
- the vane rotor 35 is provided with three vanes 36 projecting between adjacent partition walls 31 ⁇ / b> A of the housing body 32.
- Each vane 36 partitions a vane storage chamber 37 formed between the partition walls 31 ⁇ / b> A into an advance chamber 38 and a retard chamber 39.
- variable valve timing mechanism 30 The operation of the variable valve timing mechanism 30 will be described.
- the supply of the lubricating oil to the advance chamber 38 and the discharge of the lubricant from the retard chamber 39 cause the advance chamber 38 to expand and the retard chamber 39 to contract, so that the vane rotor 35 advances relative to the housing rotor 31. It rotates in the corner direction, that is, the rotation direction X of the intake camshaft 22.
- the valve timing VT changes to the advance side.
- the valve timing VT is set to the most advanced angle VTmax. .
- the retard chamber 39 expands and the advance chamber 38 contracts, so that the vane rotor 35 is retarded relative to the housing rotor 31. It rotates in the direction opposite to the corner side, that is, the rotation direction X of the intake camshaft 22.
- the valve timing VT changes to the retard side.
- the vane rotor 35 rotates with respect to the housing rotor 31, and the rotation phase of the vane rotor 35 with respect to the housing rotor 31 becomes a specific phase between the most advanced angle phase PA and the most retarded angle phase PB, that is, the intermediate angle phase PM.
- the valve timing VT is set to the intermediate angle VTmdl.
- the phase locking mechanism 40 includes an engaging portion 46 formed on the housing rotor 31, a limit pin 41 that engages with the engaging portion 46, and a lubricating oil from the lubricating device 50.
- a restriction chamber 44 that receives the supply, a restriction spring 42 that pushes the restriction pin 41 in one direction, and a spring chamber 45 that accommodates the spring are included.
- the restricting pin 41 is accommodated in the accommodating chamber 43 constituted by the restricting chamber 44 and the spring chamber 45, and moves in the axial direction of the rotating shaft of the vane rotor 35 to protrude from the accommodating chamber 43.
- the direction in which the limit pin 41 protrudes from the accommodation chamber 43 is referred to as “projection direction ZA”
- accommodation direction ZB the direction in which the limit pin 41 is accommodated in the accommodation chamber 43.
- the engaging portion 46 includes an engaging hole 48 into which the limit pin 41 is fitted, and an upper groove 47 having a depth relatively smaller than the depth of the engaging hole 48.
- the engagement hole 48 is provided at a position corresponding to the intermediate angle phase PM.
- the upper groove 47 is formed from the retard phase on the retard side to the intermediate angle phase PM with respect to the intermediate angle phase PM.
- the restriction pin 41 When the hydraulic pressure is supplied to the restriction chamber 44, the restriction pin 41 is maintained in the state accommodated in the vane 36. When the hydraulic pressure in the restriction chamber 44 is discharged, the restriction pin 41 is maintained in a state of protruding from the vane 36. When the limit pin 41 protrudes from the vane 36 and engages with the engagement hole 48, the rotational phase of the vane rotor 35 with respect to the housing rotor 31 is fixed to the intermediate angle phase PM.
- the state in which the rotation phase of the vane rotor 35 is fixed to the intermediate angle phase PM with respect to the housing rotor 31 is referred to as a “fixed state”.
- a state in which the rotational phase of the vane rotor 35 is not fixed to the intermediate angle phase PM with respect to the housing rotor 31 is referred to as an “unfixed state”.
- variable valve timing mechanism 30 and the phase locking mechanism 40 Operations of the variable valve timing mechanism 30 and the phase locking mechanism 40 will be described.
- the vane rotor 35 At the time of engine start, when the vane rotor 35 is not fixed to the housing rotor 31, the vane rotor 35 swings relative to the housing rotor 31 due to cranking at the time of engine start. Since no lubricating oil is supplied to the restriction chamber 44, a force is applied to the restriction pin 41 in the protruding direction ZA by the restriction spring 42.
- the vane rotor 35 rotates and the limiting pin 41 is disposed on the upper groove 47, the tip of the limiting pin 41 is abutted against the bottom surface of the upper groove 47.
- valve timing VT is fixed at the intermediate angle VTmdl.
- the oil control valve 53 causes the advance chamber 38 and the delay chamber so that the rotational phase of the vane rotor 35 with respect to the housing rotor 31 becomes the intermediate angle phase PM.
- the supply state of the lubricating oil to the corner chamber 39 is controlled.
- the oil pressure is reduced due to a decrease in the rotation of the oil pump 52, so that a force in the protruding direction ZA is applied to the limit pin 41.
- the limit pin 41 is fitted into the engagement hole 48. Thereby, the valve timing VT is fixed to the intermediate angle VTmdl.
- FIG. 3 the positional relationship among intake valve 21, intake cam 23, and magnetic sensor 90B is schematically shown.
- the first detection unit 91, the second detection unit 92, and the third detection unit 93 of the timing rotor 90A are positioned in relation to each intake cam 23.
- the positional relationship between the first intake cam 23A and the first detector 91 will be described.
- the relationship between the second intake cam 23B and the second detector 92 and the relationship between the third intake cam 23C and the third detector 93 are the same as the positional relationship between the first intake cam 23A and the first detector 91. is there.
- the advance side end 94 of the first detector 91 is magnetic. It is provided at a position detected by the sensor 90B.
- the retard side end portion 95 of the first detection unit 91 is located at the retard side end portion 95 when the retard side hem portion 27 of the nose 24 of the first intake cam 23A contacts the roller of the rocker arm 21A. It is provided at a position where it is detected.
- the advance side end portion 94 of the first detection unit 91 is for detecting the time (first time) when the load torque HB applied to the intake camshaft 22 switches from the retard direction to the advance direction.
- the retard side end portion 95 of the first detection unit 91 is for detecting a time (second time) when the load torque HB applied to the intake camshaft 22 is switched from the advance direction to the retard direction.
- phase fluctuation amount HC phase fluctuation amount HC
- FIG. 4 shows changes in each parameter in one cycle of the intake camshaft 22, that is, a period of two rotations of the crankshaft 17 (720 CA), where one rotation of the crankshaft 17 is 360 CA.
- FIG. 4A shows the displacement HA of the intake valve 21.
- the nose 24 of the first intake cam 23A, the second intake cam 23B, and the third intake cam 23C contacts the roller of the rocker arm 21A corresponding to each intake cam 23.
- the displacement periods of the first intake cam 23A, the second intake cam 23B, and the third intake cam 23C are shifted by one-third period.
- the intake valve 21 corresponding to the intake cam 23 is displaced downwards, and the intake valve 21 is fully opened, that is, the displacement amount HA is maximum. It becomes.
- FIG. 4B shows torque fluctuation applied to the intake camshaft 22.
- FIG. 4C shows the phase fluctuation amount HC of the intake camshaft 22.
- the intake camshaft 22 swings toward the advance side and the retard side with respect to the rotation of the crankshaft 17.
- the intake camshaft 22 swings to the most retarded side. That is, the phase variation amount on the retard side (hereinafter, “retard variation amount HCB”) is maximized on the retard side.
- the intake camshaft 22 swings to the most advanced side. At this time, the amount of phase fluctuation on the advance angle side (hereinafter, “advance angle fluctuation amount HCA”) is maximized on the advance angle side.
- the advance angle variation amount HCA and the retard angle variation amount HCB vary depending on the temperature and oil pressure of the lubricating oil supplied to the variable valve timing mechanism 30 or whether the variable valve timing mechanism 30 is in a fixed state.
- the relative rotation phase at which the retard angle variation amount HCB and the advance angle variation amount HCA are 0 does not advance or retard, and is set to a substantially constant relative rotation phase.
- This relative rotational phase is an average relative rotational phase of the intake camshaft 22 with respect to the crankshaft 17 (hereinafter referred to as “reference relative rotational phase PK”).
- FIG. 4D shows the positions at which the advance side end portion 94 and the retard angle side end portion 95 are detected by the magnetic sensor 90B, the displacement HA of the intake valve 21, and the load torque HB applied to the intake camshaft 22. And the relationship between the phase fluctuation amount HC.
- each detector 91, 92, 93 has a phase where the load torque HB is zero when the load torque HB for the intake cam 23 is switched from the retard direction to the advance direction, that is, the phase fluctuation amount HC.
- the advance angle side end 94 is detected by the magnetic sensor 90B.
- the retard side end portion 95 of each of the detectors 91, 92, 93 has a phase at which the load torque HB becomes zero when the load torque HB for the intake cam 23 is switched from the advance direction to the retard direction, that is, the amount of phase fluctuation.
- the retard side end 95 is detected by the magnetic sensor 90B.
- the relationship between the cam angle signal DB and the fixed state of the valve timing variable mechanism 30 will be described with reference to FIG.
- the missing tooth portion of the crank angle signal CB in FIG. 5 indicates the reference timing in one cycle of the crank angle signal CB.
- the cam angle signal DB indicates a signal corresponding to the first detection unit 91.
- the cam angle signal DB of the second detection unit 92 and the third detection unit 93 is the same as that of the first detection unit 91 regarding the change of the cam angle signal DB with respect to whether or not the valve timing variable mechanism 30 is in a fixed state. Therefore, the description about them is omitted.
- FIG. 5A shows the waveform of the cam angle signal DB of the first detector 91 when the relative rotational phase of the intake camshaft 22 does not vary with respect to the crankshaft 17.
- the relative rotational phase of the advance side end portion 94 of the first detector 91 with respect to the crankshaft 17 and the relative rotational phase of the retard side end portion 95 of the first detector 91 with respect to the crankshaft 17 are the reference relative rotation.
- the phase PK is the relative rotational phase of the advance side end portion 94 of the first detector 91 with respect to the crankshaft 17 and the relative rotational phase of the retard side end portion 95 of the first detector 91 with respect to the crankshaft 17.
- FIG. 5B shows the waveform of the cam angle signal DB of the first detector 91 when the variable valve timing mechanism 30 is in a fixed state.
- the relative rotational phase of the advance side end 94 of the first detector 91 with respect to the crankshaft 17 takes a value shifted by a predetermined rotational phase PN1 to the retard side with respect to the reference relative rotational phase PK.
- the relative rotational phase of the retard side end portion 95 of the first detection unit 91 with respect to the crankshaft 17 takes a value that is shifted by a predetermined rotational phase PN2 to the advance side from the reference relative rotational phase PK.
- variable valve timing mechanism 30 When the variable valve timing mechanism 30 is in the fixed state, the vane rotor 35 and the housing rotor 31 are fixed to each other, so that no rotational phase shift occurs between the vane rotor 35 and the housing rotor 31. However, since a force is applied to the intake cam 23 from the intake valve 21, the amount of deflection of the timing chain interposed between the crankshaft 17 and the housing rotor 31 varies, and the advancement of the first detection unit 91 relative to the crankshaft 17 occurs. The relative rotational phase of the corner side end portion 94 and the retard side end portion 95 varies.
- FIG. 5C shows the waveform of the cam angle signal DB of the first detector 91 when the variable valve timing mechanism 30 is in the non-fixed state.
- the relative rotational phase of the advance side end 94 of the first detector 91 with respect to the crankshaft 17 takes a value that is shifted by a predetermined rotational phase PN3 to the retard side from the reference relative rotational phase PK.
- This deviation amount that is, the predetermined rotational phase PN3 is larger than the predetermined rotational phase PN1, which is the deviation amount when the variable valve timing mechanism 30 is in the fixed state.
- the relative rotation phase of the retard side end portion 95 of the first detection unit 91 with respect to the crankshaft 17 takes a value that is shifted from the reference relative rotation phase PK by a predetermined rotation phase PN4 toward the advance side.
- This deviation amount that is, the predetermined rotational phase PN4 is larger than the predetermined rotational phase PN2 that is a deviation amount when the variable valve timing mechanism 30 is in a fixed state.
- variable valve timing mechanism 30 When the variable valve timing mechanism 30 is in the non-fixed state, the vane rotor 35 and the housing rotor 31 are not fixed to each other, so that a rotational phase shift occurs between the vane rotor 35 and the housing rotor 31. Further, when force is applied to the intake cam 23 from the intake valve 21, the amount of deflection of the timing chain interposed between the crankshaft 17 and the housing rotor 31 varies. For this reason, the relative rotational phase of the advance side end portion 94 and the retard angle side end portion 95 of the first detection portion 91 with respect to the crankshaft 17 varies greatly compared to when the valve timing variable mechanism 30 is in the fixed state.
- the waveform of the cam angle signal DB of the first detection unit 91 changes depending on whether the variable valve timing mechanism 30 is in a fixed state or an unfixed state.
- the amount of deviation of the relative rotational phase of the advance side end portion 94 of the first detector 91 relative to the crankshaft 17 with respect to the reference relative rotational phase PK is slower in the non-fixed state than in the fixed state. It becomes larger on the corner side.
- the amount of deviation of the relative rotational phase of the retard side end portion 95 of the first detection unit 91 relative to the crankshaft 17 with respect to the reference relative rotational phase PK is more advanced in the non-fixed state than in the fixed state. It becomes larger on the corner side.
- step S100 the engine speed NE of the internal combustion engine 1 is acquired.
- step S110 the relative rotational phase PNA of the advance side end 94 of the first detection unit 91 with respect to the crankshaft 17 is obtained based on the engine speed NE and the rising signal of the advance side end 94.
- step S120 an average of the relative rotational phase PNA and the relative rotational phase PNB is obtained and set as a reference relative rotational phase PK.
- step S200 the advance angle variation amount HCA is obtained from the difference between the relative rotation phase PNA of the advance side end 94 and the reference relative rotation phase PK. Further, the retardation fluctuation amount HCB is obtained from the difference between the relative rotational phase PNB of the retard side end portion 95 and the reference relative rotational phase PK.
- step S120 the total phase variation amount HCC is obtained by taking the sum of the advance angle variation amount HCA and the retard angle variation amount HCB.
- step S220 the total phase fluctuation amount HCC and the reference determination value HCK are compared.
- the total phase fluctuation amount HCC is larger than the reference determination value HCK, it is determined in step S230 that the intake camshaft 22 is not fixed to the crankshaft 17.
- the total phase fluctuation amount HCC is equal to or smaller than the reference determination value HCK, it is determined in step S240 that the intake camshaft 22 is fixed with respect to the crankshaft 17.
- the total phase fluctuation amount HCC when the mechanism 30 is in a fixed state also takes different values. Further, the total phase fluctuation amount HCC when the variable valve timing mechanism 30 is in a fixed state also changes due to the change of the friction of the mechanism 30 with time.
- the reference determination value HCK is a fixed value, it may not be possible to accurately determine whether or not the intake camshaft 22 is fixed to the crankshaft 17. For this reason, the reference determination value HCK is learned during engine operation.
- step S300 and S310 it is determined whether or not the internal combustion engine 1 is being started and the variable valve timing mechanism 30 is in a fixed state.
- step S320 it is determined whether or not the engine speed NE of the internal combustion engine 1 is at a specified speed NEA.
- step S330 the total phase fluctuation amount HCC is obtained in step S330, and this total phase fluctuation amount HCC is set as the reference determination value HCK.
- the cam angle signal DB becomes unstable, so that the advance side end 94 and the retard side end 95 of each detection unit The corresponding signal will not be detected correctly.
- the prescribed rotational speed NEA when learning the reference determination value HCK is set to a value larger than the limit rotational speed NEG that can accurately detect the cam angle signal DB.
- the target phase of the variable valve timing mechanism 30 is set to the intermediate angle VTmdl. If the valve timing VT is set to an advance side value with respect to the intermediate angle VTmdl when the engine is stopped, the oil control valve 53 changes the valve timing VT to the retard side.
- the intake cam relative to the crankshaft 17 is determined based on the total phase fluctuation amount HCC of the intake camshaft 22 relative to the crankshaft 17. It is determined whether or not the shaft 22 is in a fixed state. In this example, since the total phase fluctuation amount HCC is smaller than the reference determination value HCK, it is determined that the intake camshaft 22 is fixed to the crankshaft 17.
- the vane rotor 35 is not fixed with respect to the housing rotor 31 when the engine rotational speed NE reaches the specified rotational speed NEA, the total phase fluctuation amount HCC becomes larger than the reference determination value HCK. At this time, it is determined that the intake camshaft 22 is not fixed to the crankshaft 17.
- step S400 When the ignition switch is turned on from off, it is determined in step S400 and step S410 whether or not the intake air temperature is lower than the reference temperature and the valve timing variable mechanism 30 is in an unfixed state. When this determination is positive, in step S420, fuel injection is prohibited until the elapsed time from the start of cranking exceeds the delay time.
- the delay time is set as a period for securing a time until the limit pin 41 is fitted into the engagement hole 48 at the time of cranking.
- step S400 and step S410 the fuel injection control is executed in the normal mode. That is, fuel is injected from the cranking start time.
- the reference temperature in step S400 is set as a temperature at which the startability of the internal combustion engine 1 cannot be secured when the variable valve timing mechanism 30 is in the non-fixed state.
- variable valve timing mechanism 30 when the startability of the internal combustion engine 1 is low, the variable valve timing mechanism 30 is set in a state where a predetermined time elapses from the start of cranking without fuel injection. The period is set to a fixed state.
- the relative rotational phase fluctuates.
- the phase fluctuation amount HC of the relative rotational phase in the non-fixed state is compared with the phase fluctuation amount HC of the relative rotational phase in the fixed state, the former is larger than the latter. That is, the fluctuation amount of the relative rotation phase varies depending on whether the crankshaft 17 and the intake camshaft 22 are in a fixed state or in a non-fixed state.
- the same determination can be performed accurately.
- the cam position sensor 90 is provided so as to detect the timing rotor 90A including the advance side end portion 94 that forms the rising signal and the retard side end portion 95 that corresponds to the fall signal. It has been. Further, the advance side end portion 94 is provided in the vicinity where the fluctuation amount of the rotational torque becomes zero during the torque reduction process of the intake camshaft 22. The retard side end portion 95 is provided in the vicinity where the fluctuation amount of the rotational torque becomes zero in the process of increasing the torque of the intake camshaft 22.
- the cam position sensor 90 since the cam position sensor 90 detects the rising signal when the rotational torque becomes zero in the process of decreasing the rotational torque of the intake camshaft 22, the intake camshaft 22 changes to the maximum in the retarded direction. Can be detected. Further, in order to detect the falling signal when the torque becomes zero in the process of increasing the rotational torque of the intake camshaft 22, the advance angle fluctuation amount HCA when the intake camshaft 22 fluctuates to the maximum in the advance angle direction is detected. can do.
- the electronic control device 61 calculates the phase fluctuation amount HC based on the rising signal detected by the cam position sensor 90.
- the cam position sensor 90 is added to the intake camshaft 22. The time when the applied load torque HB switches from the retard direction to the advance direction is detected as a rising signal.
- the cam position sensor 90 detects the time when the torque applied to the intake camshaft 22 switches from the retarded direction (the direction opposite to the rotating body) to the advanced angle direction (the forward direction of the rotating body).
- the phase fluctuation amount HC toward the retard side of the relative rotation phase of the intake camshaft 22 with respect to the crankshaft 17 can be calculated.
- the electronic control unit 61 calculates the phase fluctuation amount HC based on the falling signal detected by the cam position sensor 90, and the sensor 90 is added to the intake camshaft 22. The time when the applied load torque HB switches from the advance direction to the retard direction is detected as a falling signal.
- the relative phase of the intake camshaft 22 with respect to the crankshaft 17 is an advance angle. Fluctuate greatly to the side.
- the cam position sensor 90 detects when the load torque HB applied to the intake camshaft 22 switches from the advance direction (forward direction of the same rotating body) to the retarded direction (opposite direction of the same rotating body). Therefore, the phase fluctuation amount HC toward the advance side of the relative rotation phase of the intake camshaft 22 with respect to the crankshaft 17 can be calculated.
- the cam position sensor 90 is configured such that the load torque for the intake camshaft 22 is switched from the retard direction to the advance direction, and the load torque for the intake camshaft 22 is retarded from the advance direction.
- the second time when the direction is switched is detected, and the phase fluctuation amount HC is calculated based on the first time and the second time.
- the total phase fluctuation amount HCC is calculated based on the first time related to the amount of fluctuation on the retard side of the relative rotational phase and the second time related to the amount of fluctuation on the advance side of the relative rotational phase. Since it is calculated, the total phase fluctuation amount HCC can be obtained more accurately.
- the electronic control unit 61 determines whether or not the crankshaft 17 and the intake camshaft 22 are fixed to each other when the internal combustion engine 1 is in a stopping process.
- the electronic control unit 61 determines whether the crankshaft 17 and the intake camshaft 22 are fixed to each other when the engine rotational speed NE in the stop process of the internal combustion engine 1 decreases to the specified rotational speed NEA. Determine whether or not.
- crankshaft 17 and the intake camshaft 22 are fixed to each other at a later time in the stopping process of the internal combustion engine 1. If the same determination is made in the initial stage in the stopping process of the internal combustion engine 1, then it is assumed that both rotating bodies are fixed to each other by the rotation of the crankshaft 17 and the intake camshaft 22. In this case, the determination is different from the actual fixed state of the crankshaft 17 and the intake camshaft 22. In this regard, in the above configuration, since the same determination is performed after the engine rotational speed NE has decreased to the specified rotational speed NEA, the determination result is different from the actual fixed state of the crankshaft 17 and the intake camshaft 22. The frequency of becoming can be lowered.
- the reference determination value HCK is updated based on the crank angle signal CB and the cam angle signal DB when the intake camshaft 22 and the crankshaft 17 are fixed.
- variable valve timing mechanism 30 There are individual differences in the variable valve timing mechanism 30. That is, due to variations in the dimensions of the intake camshaft 22 and the crankshaft 17 and variations in the assembly of the intake camshaft 22 and the crankshaft 17, the degree of the phase fluctuation amount HC of the intake camshaft 22 with respect to the crankshaft 17 also varies.
- the reference determination value HCK as to whether or not the intake camshaft 22 is fixed with respect to the crankshaft 17 is determined based on whether or not the intake camshaft 22 and the crankshaft 17 are fixed to each other. It is updated by the total phase fluctuation amount HCC based on the angle signal CB and the cam angle signal DB. Thereby, the above determination can be performed more accurately.
- the reference determination value HCK is updated when the engine is started before the timing at which the stop process of the internal combustion engine 1 is executed, the reference determination value HCK is used when the engine is subsequently stopped. It can be determined whether or not the crankshaft 17 and the intake camshaft 22 are fixed to each other.
- the injected fuel is difficult to burn.
- the start timing of fuel injection at the time of engine start and in the non-fixed state is set later than that at the time of engine start and in the fixed state, for example, the amount of injected fuel adhering to the spark plug is reduced. can do.
- the embodiment of the present invention is not limited to the embodiment exemplified in the above-described embodiment, and can be implemented by changing it as shown below, for example.
- the following modifications are not applied only to the above-described embodiment, and different modifications can be combined with each other.
- the phase locking mechanism 40 is configured to include the upper groove 47, but the upper groove 47 can be omitted.
- the phase fixing mechanism 40 includes an engagement hole 48 and a limit pin 41 provided corresponding to the intermediate angle phase PM.
- the upper groove 47 of the phase fixing mechanism 40 is formed from the intermediate angle phase PM toward the retarded side from the same phase, but the upper groove 47 is formed from the intermediate angle phase PM to the advanced angle side. It can also be formed toward.
- learning of the reference determination value HCK is executed when the engine is started, but this can also be set in advance. Further, in the internal combustion engine 1 that executes automatic stop for stopping the engine during idling during engine operation from when the engine is started to when the engine is stopped, the reference determination value HCK is obtained at the predetermined engine speed NE at the time of automatic stop. Can learn.
- the phase fluctuation amount of the intake camshaft 22 with respect to the crankshaft 17 varies depending on the engine state. Comparing when the internal combustion engine 1 is started and when the internal combustion engine 1 is automatically stopped, the automatic stop is closer to the state when the operation is stopped. In this modification, since the reference determination value HCK is obtained at the time of automatic stop, whether or not the intake camshaft 22 is fixed to the crankshaft 17 as compared with the case where the reference determination value HCK obtained at the time of engine start is used. More accurate determination can be made.
- the timing rotor 90A is provided with the detection units 91, 92, 93 corresponding to the intake cams 23, but either one or two can be omitted. Any two of them may be integrated.
- the timing rotor 90A is provided with only the detection units 91, 92, 93 for detecting the relative rotational phase between the crankshaft 17 and the intake camshaft 22, but a detection unit for cylinder discrimination is provided. Can do.
- the retard angle side end portion 95 and the advance angle side end portion 94 of each of the detection units 91, 92, 93 are in a phase where the load torque HB is 0, that is, the total phase fluctuation amount HCC is on the retard angle side or Although it is provided corresponding to the maximum phase on the advance side, the retard side end 95 and the advance side end 94 of each of the detection units 91, 92, 93 can be provided as follows. .
- any one or two of the detectors 91, 92, 93 are arranged so that the phase at which the load torque HB of the retard side end portion 95 and the advance side end portion 94 is maximum, that is, the total phase fluctuation amount HCC is It can be provided corresponding to a phase near zero. According to this configuration, the relative rotational phase between the crankshaft 17 and the intake camshaft 22 can be obtained by the detection unit provided corresponding to the phase where the total phase fluctuation amount HCC is near zero.
- the retard side end portion 95 of each of the detection units 91, 92, and 93 can be provided not at a position where the phase fluctuation amount HC becomes maximum on the retard side but at a position shifted from the phase.
- the advance side end 94 of each of the detectors 91, 92, 93 can be provided not at the position where the phase fluctuation amount HC is maximum on the advance side but at a position deviated from the position.
- whether or not the intake camshaft 22 is fixed to the crankshaft 17 is determined based on the total phase fluctuation amount HCC of the intake camshaft 22 with respect to the crankshaft 17. Instead of such a determination, the same determination can be performed based only on the cam angle signal DB.
- step S500 based on the engine rotational speed NE, the detection timing of the advance side end 94 and the detection timing of the retard side end 95 of the first detection unit 91.
- step S510 the phase interval PNX is compared with the reference determination value HCKA.
- the reference determination value HCKA is set as a phase interval PNX at a predetermined rotational speed at the time of engine start.
- step S520 When the phase interval PNX is larger than the reference determination value HCKA, it is determined in step S520 that the intake camshaft 22 is not fixed to the crankshaft 17. When the phase interval PNX is at the reference determination value HCKA or smaller than the reference determination value HCKA, it is determined in step S530 that the intake camshaft 22 is fixed with respect to the crankshaft 17. In this configuration, since it is determined whether or not the crankshaft 17 and the intake camshaft 22 are fixed to each other based on the phase interval PNX, the same determination can be performed.
- the determination whether or not the intake camshaft 22 is fixed to the crankshaft 17 is executed when the engine is stopped, but this determination timing is not limited to this.
- the same determination can be performed when the engine is started.
- the same determination can be performed at the time of automatic stop.
- the total phase fluctuation amount HCC or the phase interval PNX is obtained in the relationship between the crankshaft 17 and the intake camshaft 22, and the crankshaft is determined based on the total phase fluctuation amount HCC or the phase interval PNX. It is determined whether or not the intake camshaft 22 with respect to 17 is fixed.
- the object to which the present invention is applied is not limited to the crankshaft 17 and the intake camshaft 22.
- the present invention can also be applied to the determination of the fixed state of the relative rotational phase between the housing rotor 31 and the intake camshaft 22.
- the present invention can also be applied to the case where the fixed state of the relative rotation phase between the crankshaft 17 and the housing rotor 31 is determined.
- the present invention is applied to the variable valve gear 20 including the variable valve timing mechanism 30 that is fixed at the intermediate angle VTmdl.
- the present invention is not limited to the variable valve timing mechanism 30 and the present invention is applied. Can do.
- the present invention can be applied to the variable valve operating apparatus 20 including the valve timing variable mechanism 30 that is fixed at the most retarded angle VTmin.
- the present invention is applied to the variable valve timing mechanism 30 having the phase locking mechanism 40 that fixes the housing rotor 31 and the vane rotor 35 by the single limit pin 41.
- the present invention can also be applied to the variable valve timing mechanism 30 having the phase locking mechanism 40 that fixes the housing rotor 31 and the vane rotor 35 by the two limit pins 41.
- the limit pin 41 is provided in the vane rotor 35 and each engagement hole 48 is provided in the housing rotor 31.
- the limit pin 41 is provided in the housing rotor 31 and the engagement hole 48 is provided in the vane rotor 35. It can also be configured.
- the engagement and release directions of the limit pin 41 and the engagement hole 48 are the axial direction of the vane rotor 35, but the same direction is engaged with the limit pin 41 so as to coincide with the radial direction of the vane rotor 35.
- Holes 48 can also be formed.
- the present invention is applied to the valve timing variable mechanism 30 that fixes the valve timing VT at the most retarded angle VTmin.
- the present invention relates to the valve timing variable mechanism 30 that fixes the valve timing VT at the most advanced angle VTmax.
- the invention can also be applied.
- SYMBOLS 1 Internal combustion engine, 10 ... Engine main body, 11 ... Cylinder block, 12 ... Cylinder head, 13 ... Cylinder, 14 ... Piston, 15 ... Combustion chamber, 16 ... Fuel injection valve, 17 ... Crankshaft, 18 ... Oil pan, 20 DESCRIPTION OF SYMBOLS ... Variable valve gear, 21 ... Intake valve, 21A ... Rocker arm, 22 ... Intake cam shaft, 23 ... Intake cam, 23A ... First intake cam, 23B ... Second intake cam, 23C ... Third intake cam, 24 ... Nose , 25 ... vertex part, 26 ... advance angle side hem part, 27 ... retard angle side hem part, 28 ...
- exhaust valve, 29 ... exhaust camshaft, 30 variable valve timing mechanism, 31 ... housing rotor, 31A ... partition wall, 32 ... Housing body, 33 ... Sprocket, 34 ... Cover, 35 ... Vane rotor, 36 ... Vane, 37 ... Vane storage chamber, 38 ... Advance chamber, 39 ... Retarded chamber, DESCRIPTION OF SYMBOLS 0 ... Phase locking mechanism, 41 ... Limit pin, 42 ... Limit spring, 43 ... Storage chamber, 44 ... Limit chamber, 45 ... Spring chamber, 46 ... Engagement part, 47 ... Upper groove, 48 ... Engagement hole, 50 ... Lubricating device, 51 ... lubricating oil passage, 52 ... oil pump, 53 ... oil control valve, 60 ...
- control device 61 ... electronic control device, 80 ... crank position sensor (input angle sensor), 90 ... cam position sensor (output angle) Sensor), 90A ... timing rotor, 90B ... magnetic sensor, 91 ... first detector, 92 ... second detector, 93 ... third detector, 94 ... advance side end (first phase detector), 95 ... retard side end (second phase detector).
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Abstract
Description
この可変動弁装置には、入力回転体と出力回転体とが互いに固定されているか否かを判定するセンサが設けられている。またセンサの出力信号の基準値に対する正の方向のぶれ量と負の方向のぶれ量との比であるぶれ比を算出する。このぶれ比は、入力回転体と出力回転体とを互いに固定しているか否かにより、次のように変化する。すなわち、両回転対が固定されているとき、ぶれ比が所定値以下の値をとる。両回転体が固定されていないとき、出力回転体が入力回転体に対して揺れ動くため、ぶれ比が所定値よりも大きくなる。上記可変動弁装置では、内燃機関の回転の停止過程において、ぶれ比が所定値以下のとき両回転体が互いに固定されている旨判定し、ぶれ比が所定値よりも大きいとき両回転体が固定されていない旨判定する。
前記出力角センサは、前記立ち上がり信号を形成する第1位相検出部と前記立ち下がり信号に対応する第2位相検出部とを含むタイミングロータを検知するように設けられ、さらに、前記第1位相検出部は、前記出力回転体のトルク減少過程において同トルクの変動量が0となる付近に設けられ、前記第2位相検出部は、前記出力回転体のトルク増大過程において同トルクの変動量が0となる付近に設けられてもよい。
この発明では、内燃機関の回転の停止過程において固定状態か非固定状態かの判定を行う。このため、次回の機関始動時には固定状態または非固定状態に応じた始動制御を行うことができる。
可変動弁装置には個体差がある。すなわち、出力回転体および入力回転体の寸法ばらつきや出力回転体と入力回転体の組み付けのばらつきに起因して、入力回転体に対する出力回転体の揺れの程度も異なる。この点、この発明によれば、入力回転体に対し出力回転体が固定されているか否かの基準判定値は、出力回転体と入力回転体とが互いに固定されているときの入力角信号および出力角信号に基づいて更新される。これにより上記判定をより正確に行うことができる。
図2(A)に示されるように、バルブタイミング可変機構30は、クランクシャフト17に同期して回転するハウジングロータ31と、吸気カムシャフト22に同期して回転するベーンロータ35と、バルブタイミングVTを中間角VTmdlに固定する位相固定機構40とを含む。
進角室38への潤滑油の供給および遅角室39からの潤滑油の排出により、進角室38が拡大するとともに遅角室39が縮小して、ベーンロータ35がハウジングロータ31に対して進角側すなわち吸気カムシャフト22の回転方向Xに回転する。これにより、バルブタイミングVTが進角側に変化する。ベーンロータ35がハウジングロータ31に対して最も進角側に回転したとき、すなわちハウジングロータ31に対するベーンロータ35の回転位相が最進角位相PAにあるとき、バルブタイミングVTは最進角VTmaxに設定される。
機関始動時において、ハウジングロータ31に対してベーンロータ35が固定されていないとき、機関始動時のクランキングにより、ハウジングロータ31に対してベーンロータ35が揺れる。制限室44には潤滑油が供給されていないため、制限ピン41には、制限ばね42により突出方向ZAに力が加えられている。ベーンロータ35が回転して制限ピン41が上段溝47上に配置されたとき、制限ピン41の先端部が上段溝47の底面に突き当てられる。さらに、ベーンロータ35が回転して制限ピン41と係合穴48との位置が一致したとき、制限ピン41の先端部が係合穴48の底面に突き当てられる。このようにして、バルブタイミングVTが中間角VTmdlに固定される。
タイミングロータ90Aの第1検出部91と第2検出部92と第3検出部93は、各吸気カム23との関係で位置決めされている。以下、第1吸気カム23Aと第1検出部91との位置関係について説明する。第2吸気カム23Bと第2検出部92との関係、および第3吸気カム23Cと第3検出部93との関係は、第1吸気カム23Aと第1検出部91との位置関係と同様である。
吸気バルブ21が開弁し始めるとき、すなわち吸気カム23のノーズ24の進角側裾部26がロッカアーム21Aのローラに接触し始めるとき、吸気カムシャフト22の回転方向とは反対方向に向けて吸気バルブ21の力が加えられる。このため、吸気カムシャフト22に対して遅角方向に加えられる負荷トルクHBが増大する。このとき、吸気カムシャフト22の回転トルクは減少する。
同図5のクランク角信号CBの欠歯部は、同クランク角信号CBの一周期における基準タイミングを示す。カム角信号DBは、第1検出部91に対応する信号を示している。第2検出部92および第3検出部93のカム角信号DBについては、バルブタイミング可変機構30が固定状態にあるか否かに対するカム角信号DBの変化に関して、第1検出部91と同様であるため、これらについての説明は省略する。
このとき、クランクシャフト17に対する第1検出部91の進角側端部94の相対回転位相は、基準相対回転位相PKよりも遅角側に所定回転位相PN1ずれた値をとる。一方、クランクシャフト17に対する第1検出部91の遅角側端部95の相対回転位相は、基準相対回転位相PKよりも進角側に所定回転位相PN2ずれた値をとる。
この場合、クランクシャフト17に対する第1検出部91の進角側端部94の相対回転位相は、基準相対回転位相PKよりも遅角側に所定回転位相PN3ずれた値をとる。このずれ量すなわち所定回転位相PN3は、バルブタイミング可変機構30が固定状態にあるときのずれ量である所定回転位相PN1よりも大きい。
ステップS300およびステップS310において、内燃機関1が機関始動中にあり、かつバルブタイミング可変機構30が固定状態にあるか否かについて判定する。この判定が肯定されるとき、ステップS320において、内燃機関1の機関回転速度NEが規定回転速度NEAにあるか否かについて判定する。この判定が肯定されるとき、ステップS330において総位相変動量HCCが求められ、この総位相変動量HCCが基準判定値HCKとして設定される。
(1)本実施形態では、クランクシャフト17に対する吸気カムシャフト22の相対回転位相の変化量である総位相変動量HCCに基づいて、クランクシャフト17と吸気カムシャフト22とが互いに固定されているか否か判定することを要旨とする。
なお、本発明の実施態様は上記実施形態にて例示した態様に限られるものではなく、これを例えば以下に示すように変更して実施することもできる。また以下の各変形例は、上記実施形態についてのみ適用されるものではなく、異なる変形例同士を互いに組み合わせて実施することもできる。
(c)各検出部91,92,93の進角側端部94は、位相変動量HCが進角側に最大となる位置ではなく、当該位置からずれたところに設けることができる。
イグニッションスイッチがオンからオフに切り替えられたとき、ステップS500において、機関回転速度NEと、第1検出部91の進角側端部94の検出タイミングと遅角側端部95の検出タイミングとに基づいて位相間隔PNX(期間変動量)を求める。次に、ステップS510において、位相間隔PNXと基準判定値HCKAとを比較する。基準判定値HCKAは、機関始動時の所定回転速度における位相間隔PNXとして設定される。
Claims (15)
- 機関バルブを駆動する出力回転体と、この出力回転体を駆動する入力回転体とを含み、前記入力回転体に対する前記出力回転体の回転位相である相対回転位相を変更する機能、および前記相対回転位相が特定位相のときに前記入力回転体と前記出力回転体とを互いに固定する機能を有する内燃機関の可変動弁装置において、
前記相対回転位相の変化量である位相変動量に基づいて前記入力回転体と前記出力回転体とが互いに固定されているか否か判定する
ことを特徴とする内燃機関の可変動弁装置。 - 請求項1に記載の内燃機関の可変動弁装置において、
前記入力回転体の回転位相を検出する入力角センサと、前記出力回転体の回転位相を検出する出力角センサとを備え、
前記入力角センサの検出信号である入力角信号および前記出力角センサの検出信号である出力角信号に基づいて前記位相変動量を算出する
ことを特徴とする内燃機関の可変動弁装置。 - 請求項2に記載の内燃機関の可変動弁装置において、
前記出力角センサが検出する前記出力角信号の立ち上がり信号と立ち下がり信号とに基づいて前記位相変動量を算出する
ことを特徴とする内燃機関の可変動弁装置。 - 請求項3に記載の内燃機関の可変動弁装置において、
前記出力角センサは、前記立ち上がり信号を形成する第1位相検出部と前記立ち下がり信号に対応する第2位相検出部とを含むタイミングロータを検知するように設けられ、
前記第1位相検出部は、前記出力回転体のトルク減少過程において同トルクの変動量が0となる付近に設けられ、
前記第2位相検出部は、前記出力回転体のトルク増大過程において同トルクの変動量が0となる付近に設けられる
ことを特徴とする内燃機関の可変動弁装置。 - 請求項2または3に記載の内燃機関の可変動弁装置において、
前記出力角センサが検出する前記出力角信号の立ち上がり信号に基づいて、前記位相変動量を算出するものであり、
前記出力角センサは、前記出力回転体に加えられるトルクが遅角方向から進角方向に切り替わる時期を前記立ち上がり信号として検出する
ことを特徴とする内燃機関の可変動弁装置。 - 請求項2または3に記載の内燃機関の可変動弁装置において、
前記出力角センサが検出する前記出力角信号の立ち下がり信号に基づいて、前記位相変動量を算出するものであり、
前記出力角センサは、前記出力回転体に加えられるトルクが進角方向から遅角方向に切り替わる時期を前記立ち下がり信号として検出する
ことを特徴とする内燃機関の可変動弁装置。 - 請求項2または3に記載の内燃機関の可変動弁装置において、
前記出力角センサは、前記出力回転体に対するトルクが遅角方向から進角方向に切り替わる第1時期と、前記出力回転体に対するトルクが進角方向から遅角方向に切り替わる第2時期とを検出するものであり、
前記位相変動量は、前記第1時期と前記第2時期とに基づいて算出されるものである
ことを特徴とする内燃機関の可変動弁装置。 - 請求項1~7に記載のいずれか一項に記載の内燃機関の可変動弁装置において、
前記内燃機関が停止過程にあるとき、前記入力回転体と前記出力回転体とが互いに固定されているか否かの判定を実行する
ことを特徴とする内燃機関の可変動弁装置。 - 請求項8に記載に記載の内燃機関の可変動弁装置において、
前記内燃機関の停止過程における機関回転速度が規定回転速度に低下したとき、前記入力回転体と前記出力回転体とが互いに固定されているか否かの判定を実行する
ことを特徴とする内燃機関の可変動弁装置。 - 請求項1~9のいずれか一項に記載の内燃機関の可変動弁装置において、
前記位相変動量が基準判定値よりも小さいとき、前記入力回転体と前記出力回転体とが互いに固定されている旨判定し、
前記位相変動量が前記基準判定値よりも大きいとき、前記入力回転体と前記出力回転体とが互いに固定されていない旨判定する
ことを特徴とする内燃機関の可変動弁装置。 - 請求項10に記載の内燃機関の可変動弁装置において、
前記出力回転体と前記入力回転体とが互いに固定されているときの前記入力角信号および前記出力角信号に基づいて前記基準判定値が更新される
ことを特徴とする内燃機関の可変動弁装置。 - 請求項11に記載の内燃機関の可変動弁装置において、
前記内燃機関の始動後かつ前記出力回転体と前記入力回転体とが互いに固定されているとき、前記入力角信号および前記出力角信号に基づいて前記基準判定値が更新される
ことを特徴とする内燃機関の可変動弁装置。 - 請求項12に記載の内燃機関の可変動弁装置において、
前記内燃機関が自動停止されるときに前記入力回転体と前記出力回転体とを互いに固定する機能を備え、
前記内燃機関が自動停止状態かつ前記入力回転体と前記出力回転体とが互いに固定されているとき、前記入力角信号および前記出力角信号に基づいて前記基準判定値が更新される
ことを特徴とする内燃機関の可変動弁装置。 - 請求項1~13に記載のいずれか一項に記載の内燃機関の可変動弁装置において、
前記内燃機関の始動時、前記相対回転位相が固定されていないときには、前記相対回転位相が固定されているときに比べて、燃料噴射の開始時期を遅くする
ことを特徴とする内燃機関の可変動弁装置。 - 機関バルブを駆動する出力回転体と、この出力回転体を駆動する入力回転体とを含み、前記入力回転体に対する前記出力回転体の回転位相である相対回転位相を変更する機能、および前記相対回転位相が特定位相のときに前記入力回転体と前記出力回転体とを互いに固定する機能を有する内燃機関の可変動弁装置において、
前記入力回転体の位相を検出する入力角センサと、前記出力回転体の回転位相を検出する出力角センサとを備え、
前記出力角センサは、前記出力回転体に加えられるトルクが進角方向から遅角方向に切り替わるときを第1検出時期として検出するとともに、前記出力回転体に加えられるトルクが遅角方向から進角方向に切り替わるときを第2検出時期として検出するものであり、
前記第1検出時期と前記第2検出時期との間隔の変動量である期間変動量が基準判定値よりも小さいとき、前記入力回転体に対して前記出力回転体が固定されている旨判定し、
前記期間変動量が基準判定値よりも大きいとき、前記入力回転体に対して前記出力回転体が固定されている旨判定する
ことを特徴とする内燃機関の可変動弁装置。
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|---|---|---|---|
| US13/696,194 US8683968B2 (en) | 2010-05-12 | 2010-05-12 | Variable valve assembly for internal combustion engine |
| PCT/JP2010/058025 WO2011142007A1 (ja) | 2010-05-12 | 2010-05-12 | 内燃機関の可変動弁装置 |
| DE112010005549.1T DE112010005549B4 (de) | 2010-05-12 | 2010-05-12 | Variable Ventilbaugruppe für eine Brennkraftmaschine |
| CN201080066672.2A CN103038461B (zh) | 2010-05-12 | 2010-05-12 | 内燃机的可变气门装置 |
| JP2012514636A JP5408347B2 (ja) | 2010-05-12 | 2010-05-12 | 内燃機関の可変動弁装置 |
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| PCT/JP2010/058025 WO2011142007A1 (ja) | 2010-05-12 | 2010-05-12 | 内燃機関の可変動弁装置 |
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| JP (1) | JP5408347B2 (ja) |
| CN (1) | CN103038461B (ja) |
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| JP2015166557A (ja) * | 2014-03-03 | 2015-09-24 | 株式会社日本自動車部品総合研究所 | 内燃機関のバルブタイミング制御装置 |
| CN110094268A (zh) * | 2018-01-30 | 2019-08-06 | 丰田自动车株式会社 | 内燃机的控制装置 |
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| JP5900428B2 (ja) * | 2013-07-09 | 2016-04-06 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
| JP5949819B2 (ja) * | 2014-03-25 | 2016-07-13 | トヨタ自動車株式会社 | 内燃機関の燃料噴射制御装置 |
| US9777604B2 (en) * | 2014-10-21 | 2017-10-03 | Ford Global Technologies, Llc | Method and system for variable cam timing device |
| DE102018220743A1 (de) * | 2018-11-30 | 2020-06-04 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Regelung eines Nockenwellen-Phasenstellers in einem Verbrennungsmotor |
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- 2010-05-12 CN CN201080066672.2A patent/CN103038461B/zh not_active Expired - Fee Related
- 2010-05-12 US US13/696,194 patent/US8683968B2/en active Active
- 2010-05-12 DE DE112010005549.1T patent/DE112010005549B4/de not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN103038461A (zh) | 2013-04-10 |
| CN103038461B (zh) | 2015-06-17 |
| JPWO2011142007A1 (ja) | 2013-07-22 |
| DE112010005549T5 (de) | 2013-03-07 |
| US8683968B2 (en) | 2014-04-01 |
| JP5408347B2 (ja) | 2014-02-05 |
| DE112010005549B4 (de) | 2017-08-31 |
| US20130055980A1 (en) | 2013-03-07 |
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