JP2018021599A - Device for controlling electric oil pump, method for controlling electric oil pump, device for controlling non-stage transmission and method for controlling non-stage transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for an electric oil pump, a control method for an electric oil pump, a control device for a continuously variable transmission, and a continuously variable transmission that can detect the protrusion of a vane of an electric oil pump without using a hydraulic sensor. Provide a control method. A controller 11 is a control device for an electric oil pump 3, and detects a current consumption value C of the electric oil pump 3. The controller 11 determines the vane overhang of the electric oil pump 3 based on the current consumption value C. [Selection diagram] Figure 1

Description

  The present invention relates to control of an electric oil pump.

  Patent Document 1 discloses a technique in which an electric oil pump supplies an amount of oil that is insufficient for supply by a mechanical oil pump.

JP 2009-96326 A

  When the electric oil pump is a vane type, the vane may not protrude when the electric oil pump is started. In this case, an appropriate oil amount cannot be supplied by the electric oil pump, and a situation where the required oil amount cannot be satisfied may occur. For this reason, it can be said that it is preferable to detect the overhang of the vane so as to cope with such a situation.

  In order to detect the overhang of the vane, for example, it is conceivable to provide a hydraulic pressure sensor that detects the hydraulic pressure of the discharge unit and detect the overhang of the vane based on the hydraulic pressure detected by the hydraulic sensor. In this case, however, the provision of the hydraulic sensor is disadvantageous in terms of weight and layout in addition to cost.

  The present invention has been made in view of such problems, and an electric oil pump control device, an electric oil pump control method, and an electric oil pump control method capable of detecting the vane overhang of an electric oil pump without using a hydraulic sensor. It is an object of the present invention to provide a control device for a continuously variable transmission and a control method for a continuously variable transmission.

  A control device for an electric oil pump according to an aspect of the present invention is a control device for a vane-type electric oil pump, and includes a control unit that detects a current consumption value of the electric oil pump, and the control unit includes: The electric oil pump is configured to perform vane overhang determination based on a current consumption value.

  A control device for a continuously variable transmission according to another aspect of the present invention is supplied with oil from a main oil pump driven by a drive source, a vane-type electric oil pump, and the main oil pump and the electric oil pump. And a control unit for detecting a current consumption value of the electric oil pump, wherein the control unit is configured to control the electric oil pump based on the current consumption value. When the control unit determines that the vane is not overhanging even though a drive instruction is given to the electric oil pump, the shift speed or target of the continuously variable transmission is determined. It is configured to execute protection control for changing the gear ratio.

  According to still another aspect of the present invention, there is provided a control method for a vane-type electric oil pump, wherein a current consumption value of the electric oil pump is detected, and the vane of the electric oil pump is based on the current consumption value. Performing an overhang determination, and a method for controlling an electric oil pump is provided.

  According to still another aspect of the present invention, a main oil pump driven by a drive source, a vane type electric oil pump, a control valve unit to which oil is supplied from the main oil pump and the electric oil pump, A control method for a continuously variable transmission, comprising: detecting a current consumption value of the electric oil pump; determining a vane overhang of the electric oil pump based on the current consumption value; and the electric oil pump And executing protection control for changing the transmission speed or the target transmission ratio of the continuously variable transmission when it is determined that the vane is not overhanging even though a drive instruction is issued. A method for controlling a step transmission is provided.

  According to these aspects, when a detecting means such as a sensor for measuring the current consumption value of the electric oil pump is provided, the detection of the vane is detected without using a hydraulic sensor by using this detecting means together. be able to.

It is a schematic block diagram which shows the principal part of a continuously variable transmission. It is a figure which shows an example of control of embodiment by a flowchart. It is a figure which shows an example of the change of the various parameters at the time of electric oil pump control start.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic configuration diagram showing a main part of a continuously variable transmission 1. The continuously variable transmission 1 is a belt-type continuously variable transmission and is provided in a vehicle. The continuously variable transmission 1 is transmitted with the power of the engine ENG that constitutes the drive source of the vehicle.

  The continuously variable transmission 1 includes a mechanical oil pump 2, an electric oil pump 3, a first strainer 4, a second strainer 5, a first check valve 6, a second check valve 7, and a control valve unit. 8 and a controller 11. The continuously variable transmission 1 further includes a pulley part PLY, a clutch part CL, a range switching actuator ACT, a torque converter TC, and a lubrication part LU.

  The mechanical oil pump 2 constitutes a main oil pump that is driven by the engine ENG. The mechanical oil pump 2 sucks oil through the first strainer 4 and supplies the oil to the control valve unit 8 through the first check valve 6.

  The electric oil pump 3 is a vane type oil pump. The electric oil pump 3 is connected to a portion of the supply oil path from the mechanical oil pump 2 to the control valve unit 8 on the downstream side of the first check valve 6 via the second check valve 7. Specifically, the electric oil pump 3 is configured to have the pump portion 31 connected in this way. The electric oil pump 3 sucks oil through the second strainer 5 and supplies the oil to the control valve unit 8 through the second check valve 7.

  Both the first strainer 4 and the second strainer 5 filter oil. The first check valve 6 allows the flow of oil in the direction from the mechanical oil pump 2 toward the control valve unit 8 and blocks the flow in the reverse direction. The second check valve 7 allows the flow of oil in the direction from the electric oil pump 3 toward the control valve unit 8 and blocks the flow in the reverse direction.

  The control valve unit 8 is a hydraulic control circuit, and oil is supplied from the control valve unit 8 to the pulley unit PLY, the clutch unit CL, the range switching actuator ACT, the torque converter TC, the lubrication unit LU, and the like.

  The pulley portion PLY includes a primary pulley and a secondary pulley, and hydraulic actuators that drive the primary pulley and the secondary pulley. The primary pulley and the secondary pulley constitute a continuously variable transmission mechanism of the continuously variable transmission 1 together with a belt wound around them. The clutch portion CL includes a hydraulic forward clutch that is engaged when the vehicle moves forward and transmits power, and a hydraulic reverse brake that is engaged when the vehicle moves backward and transmits power.

  The range switching actuator ACT is a hydraulic actuator for range switching, and drives the range switching valve provided in the control valve unit 8 according to the selected range of the continuously variable transmission 1 to switch the oil path. For example, the range switching valve is configured such that a park rod is further provided. As the range switching valve, a manual valve that is mechanically driven according to a driver operation may be used. In this case, the range switching actuator ACT is not necessary.

  The torque converter TC performs torque transmission via the working fluid. In the torque converter TC, oil is supplied as a working fluid and also supplied to a hydraulic lockup clutch. The lubrication unit LU is configured to include each unit that requires lubrication in the continuously variable transmission 1.

  The electric oil pump 3 further includes a motor 9 and an inverter 10. The motor 9 drives the pump unit 31. Specifically, the motor 9 is a three-phase AC motor. The inverter 10 supplies current to the motor 9. Specifically, the inverter 10 converts the direct current from the battery BATT into a three-phase alternating current and then supplies it to the motor 9.

  The motor 9 is provided with a rotation speed sensor 9 a for detecting the rotation speed of the motor 9. The inverter 10 is provided with a current sensor 10a that detects an input current. The rotation speed sensor 9 a and the current sensor 10 a are generally provided for controlling the driving of the motor 9 by the inverter 10. The signal from the rotation speed sensor 9 a and the signal from the current sensor 10 a are input to the inverter 10 and further to the controller 11.

The controller 11 is an electronic control unit. The controller 11 includes an accelerator for detecting a signal from the rotational speed sensor 21 for detecting the rotational speed NE of the engine ENG and an accelerator opening APO that represents an operation amount of the accelerator pedal. A signal from the opening sensor 22, a signal from the vehicle speed sensor 23 for detecting the vehicle speed VSP, an oil temperature sensor 24 for detecting the oil temperature _TOIL of the continuously variable transmission 1, and a signal from the selection range detection switch 25 RNG or the like is input.

  The controller 11 controls the control valve unit 8, the inverter 10 and the like based on the input signal. The controller 11 controls the control valve unit 8 to control the pulley unit PLY, the clutch unit CL, the range switching actuator ACT, the lock-up clutch of the torque converter TC, and the like. In controlling the electric oil pump 3, the controller 11 controls the drive of the motor 9 by controlling the inverter 10, thereby controlling the drive of the pump unit 31.

  By the way, in the continuously variable transmission 1 in which the electric oil pump 3 is a vane type electric oil pump, the vane may not protrude when the electric oil pump 3 is activated. In this case, the electric oil pump 3 cannot supply an appropriate amount of oil, that is, a flow rate of the oil, and a situation in which the required amount of oil of the continuously variable transmission 1 cannot be satisfied may occur. For this reason, it can be said that it is preferable to detect the overhang of the vane so as to cope with such a situation.

  In order to detect the overhang of the vane, for example, it is conceivable to provide a hydraulic pressure sensor that detects the hydraulic pressure of the discharge unit and detect the overhang of the vane based on the hydraulic pressure detected by the hydraulic sensor. In this case, however, the provision of the hydraulic sensor is disadvantageous in terms of weight and layout in addition to cost.

  In view of such circumstances, in the present embodiment, the controller 11 is configured to perform the control described below.

  FIG. 2 is a flowchart illustrating an example of the control performed by the controller 11.

  In step S <b> 1, the controller 11 starts control of the electric oil pump 3. As a result, a drive instruction is given to the electric oil pump 3. The control of the electric oil pump 3 can be started when the starting condition of the electric oil pump 3 is satisfied. The starting condition of the electric oil pump 3 is, for example, when the amount of oil supplied from the mechanical oil pump 2 is lower than the required oil amount. Other conditions may be applied to the starting condition of the electric oil pump 3.

  In step S2, the controller 11 determines whether or not the vane of the electric oil pump 3 is overhanging. That is, in step S <b> 2, the controller 11 performs the vane overhang determination of the electric oil pump 3. The vane overhang determination is performed based on the current consumption value C of the electric oil pump 3. This is because the current consumption value C of the electric oil pump 3 changes according to the state of the vane.

  Specifically, when the vane is not overhanging, the load of the electric oil pump 3 is reduced, so that the current consumption value C is reduced. Further, when the vane is overhanging, the load on the electric oil pump 3 is increased, and thus the current consumption value C is increased.

  The controller 11 detects the current consumption value C of the electric oil pump 3 based on the signal from the current sensor 10a. This is because the input current of the inverter 10 is used as the drive current of the motor 9 and is consumed as the consumption current of the electric oil pump 3.

  In step S2, the controller 11 specifically determines that the vane is overhanging when the consumption current value C is equal to or greater than the predetermined value C1. The predetermined value C1 is a value for defining whether or not the vane is overhanging, and can be set in advance by an experiment or the like.

  FIG. 3 is a diagram illustrating an example of changes in various parameters when the control of the electric oil pump 3 is started. In FIG. 3, the consumption current value C of the electric oil pump 3 and the rotational speed NP of the electric oil pump 3 are shown as various parameters. In FIG. 3, the consumption current value C when the vane is overhanging is indicated by a solid line, and the consumption current value C when the vane is not overhanging is indicated by a broken line.

  At timing T1, a drive instruction is given to the electric oil pump 3. As a result, the rotational speed NP increases from the timing T1. When the vane is overhanging, the consumption current value C rises from the timing T1 as shown by the solid line. The change in the rotational speed NP according to the drive instruction becomes a steady state at a timing T2 after a transient state from the timing T1. The same applies to changes in the current consumption value C.

  When the vane is not overhanging, as shown by the broken line, the current consumption value C does not change significantly at the timing T1. In this example, the vane starts to protrude at the timing T3 after the timing T2, and thereby the consumption current value C starts to increase. Thereafter, the change in the current consumption value C goes through a transient state and becomes a steady state as in the case of the solid line.

  In view of such a change, for example, the predetermined value C1 is set to a value slightly smaller than the current consumption value C when the change in the rotational speed NP according to the drive instruction is in a steady state and the vane is overhanging. can do. The predetermined value C1 may be set to a value within a fluctuation range of the consumption current value C that fluctuates as described later. The predetermined value C1 can be a variable value.

  Returning to FIG. 2, if a positive determination is made in step S2, it is determined that the vane is overhanging. In this case, the process proceeds to step S3, and the controller 11 executes normal control of the electric oil pump 3. The normal control is control of the electric oil pump 3 without the protection control described below. After step S3, the process ends.

  If a negative determination is made in step S2, it is determined that the vane is not overhanging although the electric oil pump 3 is instructed to drive. In this case, the process proceeds to step S4, and the controller 11 executes protection control for the continuously variable transmission 1.

  The protection control is control for changing the speed change speed or the target speed ratio of the continuously variable transmission 1. Specifically, in the protection control, the speed change speed is decreased, and the target speed change ratio is changed so that the difference from the current speed change ratio becomes smaller. Thereby, the required oil amount of continuously variable transmission 1 falls.

  The shift speed can be changed, for example, by changing the target value, and the target gear ratio can be changed, for example, by switching the shift line of the shift map. The difference between the target gear ratio and the current gear ratio is, for example, a downshift amount. In the protection control, both the transmission speed and the target transmission ratio may be changed.

  After step S4, the process returns to step S2. Since the negative determination is made in step S2 while the vane is not overhanging, the process proceeds to step S4, and the execution of the protection control is continued. Thereafter, when the vane overhangs, an affirmative determination is made in step S2, and the process proceeds to step S3. Thereby, when the vane overhangs during the execution of the protection control, it is possible to shift from the protection control to the normal control.

  The controller 11 constitutes a control device for the electric oil pump 3 and a control device for the continuously variable transmission 1. The controller 11 is configured to have a control unit by performing the process of step S2 and further the process of step S4.

  Next, main effects of the present embodiment will be described.

  The controller 11 is a control device for the electric oil pump 3 and detects a current consumption value C of the electric oil pump 3. The controller 11 determines the vane overhang of the electric oil pump 3 based on the current consumption value C.

  According to such a configuration, when the current sensor 10a for measuring the current consumption value C of the electric oil pump 3 is provided, the current sensor 10a is used together to detect the extension of the vane without using the hydraulic sensor. (Effects corresponding to claims 1 and 6).

  The controller 11 determines that the vane is overhanging when the current consumption value C is equal to or greater than the predetermined value C1. That is, the case where the current consumption value C is equal to or greater than the predetermined value C1 means that the load of the electric oil pump 3 has increased, and that means that the hydraulic pressure has increased by the electric oil pump 3. According to this, it is possible to determine whether the vane is overhanging (effect corresponding to claim 2).

  The controller 11 is a control device for the continuously variable transmission 1 having a mechanical oil pump 2, an electric oil pump 3, and a control valve unit 8 to which oil is supplied from the mechanical oil pump 2 and the electric oil pump 3. Thus, the current consumption value C of the electric oil pump 3 is detected. The controller 11 performs the vane overhang determination of the electric oil pump 3 based on the current consumption value C, and protects when the vane is not overhanging although the electric oil pump 3 is instructed to drive. Execute control.

  According to such a configuration, when the vane is not overhanging, the required oil amount of the continuously variable transmission 1 can be reduced. For this reason, the continuously variable transmission 1 can be protected by preventing or suppressing the occurrence of problems such as belt slip in the continuously variable transmission 1 due to insufficient oil amount. Corresponding effect).

  The controller 11 may be configured as described below.

  Here, the electric oil pump 3 has a discharge mode in which oil is sequentially discharged from each of the plurality of vane chambers, and thus has a unique pulsation. Then, this pulsation appears as a hydraulic pressure fluctuation at the discharge part of the electric oil pump 3. Further, since such hydraulic pressure fluctuations cause fluctuations in the load of the electric oil pump 3, pulsation also appears in changes in the current consumption value C.

  Therefore, as shown by the solid line in FIG. 3, when the vane is overhanging, the consumption current value C pulsates from the timing T2 when the change in the rotational speed NP according to the drive instruction becomes a steady state. fluctuate.

  In light of such circumstances, the controller 11 may be configured to determine that the vane is overhanging when detecting a change in the consumption current value C indicating pulsation of hydraulic pressure. Even with such a configuration, it is possible to determine whether or not the vane is overhanging (effect corresponding to claim 3).

  As indicated by a broken line in FIG. 3, when the vane is not overhanging, the consumption current value C remains lower than the predetermined value C1 until the predetermined period INT elapses from the timing T2.

  The timing T2 can be detected based on the rotational speed NP. The rotational speed NP can be detected based on a signal from the rotational speed sensor 9a. The predetermined period INT is a value for giving a time margin for the determination. This is because the current consumption value C fluctuates so as to pulsate even when the change in the rotational speed NP becomes a steady state, and thus such a fluctuation can affect the determination. The predetermined period INT can be set in advance by an experiment or the like.

  For this reason, the controller 11 may be configured to detect the rotational speed NP and perform the vane overhang determination of the electric oil pump 3 based on the rotational speed NP and the current consumption value C. Even with such a configuration, the vane overhang determination can be performed. Further, according to such a configuration, more accurate determination can be performed. (Effect corresponding to claim 4).

  Specifically, the controller 11 having such a configuration may be configured to perform vane overhang determination of the electric oil pump 3 based on the current consumption value C within a predetermined period INT from the timing T2. In this case, more accurate determination is possible by setting the predetermined period INT and performing determination in a more stable state than when performing determination in a transitional state between timing T1 and timing T2.

  The controller 11 performs a vane overhang determination of the electric oil pump 3 based on the current consumption value C between the timing T1 and the timing T2, that is, until the change in the rotational speed NP according to the drive instruction becomes a steady state. It may be said.

  In this case, for example, the controller 11 indicates that the vane is overhanging when the consumption current value C within the predetermined period INT is equal to or greater than the predetermined value C2 from the timing T1, that is, after the rotation speed NP starts to increase according to the drive instruction. It can be set as the structure which determines. The predetermined value C2 is a value lower than the predetermined value C1, and can be set to a value slightly larger than the current consumption value C when the vane is not overhanging, for example. In this case, the determination can be performed earlier than the determination based on the current consumption value C within the predetermined period T from the timing T2.

  The rotational speed NP may be used to set a predetermined timing instead of using the predetermined period INT. Even with such a configuration, it is possible to determine whether the vane is overhanging.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  In the above-described embodiment, the plurality of vane overhang determinations are individually described. However, in determining the vane overhang, two or more of the plurality of vane overhang determinations may be combined. That is, in determining the vane overhang, any one of a plurality of vane overhang determinations may be performed, or two or more determinations may be performed. It is preferable to perform two or more determinations because the determination accuracy becomes high.

  In the above-described embodiment, the case where the current sensor 10a is a current sensor that detects the input current of the inverter 10 has been described. However, the current sensor 10a may be configured with one or a plurality of current sensors that detect the phase current of the inverter 10, for example.

  In the above-described embodiment, the case where the controller 11 is configured to have a control unit has been described. However, for example, a plurality of controllers instead of the controller 11 may be configured to have a control unit.

1 continuously variable transmission 2 mechanical oil pump (main oil pump)
DESCRIPTION OF SYMBOLS 3 Electric oil pump 8 Control valve unit 9 Motor 9a Rotational speed sensor 10 Inverter 10a Current sensor 11 Controller (control part)

Claims (7)

A control device for a vane type electric oil pump,
A control unit for detecting a current consumption value of the electric oil pump;
The control unit performs vane overhang determination of the electric oil pump based on the current consumption value.
A control device for an electric oil pump. It is a control apparatus of the electric oil pump of Claim 1, Comprising:
The control unit determines that the vane protrudes when the current consumption value is equal to or greater than a predetermined value.
A control device for an electric oil pump. The control device for an electric oil pump according to claim 1 or 2,
The control unit determines that the vane is overhanging when detecting a change in the consumption current value indicating pulsation of hydraulic pressure,
A control device for an electric oil pump. A control device for an electric oil pump according to claim 3,
The control unit detects a rotation speed of the electric oil pump,
The control unit performs vane overhang determination of the electric oil pump based on the rotation speed of the electric oil pump and the current consumption value.
A control device for an electric oil pump. A main oil pump driven by a drive source;
A vane-type electric oil pump;
A control valve unit to which oil is supplied from the main oil pump and the electric oil pump;
A continuously variable transmission control device comprising:
A control unit for detecting a current consumption value of the electric oil pump;
The control unit performs vane overhang determination of the electric oil pump based on the current consumption value,
The control unit is a protection control that changes a speed change speed or a target speed change ratio of the continuously variable transmission when it is determined that a vane is not overhanging despite an instruction to drive the electric oil pump. Run the
A control device for a continuously variable transmission. A control method for a vane-type electric oil pump,
Detecting a current consumption value of the electric oil pump;
Performing vane overhang determination of the electric oil pump based on the current consumption value;
A method for controlling an electric oil pump, comprising: A main oil pump driven by a drive source;
A vane-type electric oil pump;
A control valve unit to which oil is supplied from the main oil pump and the electric oil pump;
A continuously variable transmission control method comprising:
Detecting a current consumption value of the electric oil pump;
Performing vane overhang determination of the electric oil pump based on the current consumption value;
Executing protection control for changing a speed change speed or a target speed change ratio of the continuously variable transmission when it is determined that the vane is not overhanging in spite of an instruction to drive the electric oil pump; ,
A control method for a continuously variable transmission.

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