CN107131060B - A method of it is pressed based on dynamic cylinder and determines the engine valve open and close moment - Google Patents
A method of it is pressed based on dynamic cylinder and determines the engine valve open and close moment Download PDFInfo
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- CN107131060B CN107131060B CN201710321912.2A CN201710321912A CN107131060B CN 107131060 B CN107131060 B CN 107131060B CN 201710321912 A CN201710321912 A CN 201710321912A CN 107131060 B CN107131060 B CN 107131060B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000007246 mechanism Effects 0.000 claims abstract description 11
- 230000006835 compression Effects 0.000 claims description 12
- 238000007906 compression Methods 0.000 claims description 12
- 239000000446 fuel Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 9
- 238000002485 combustion reaction Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 5
- 230000006698 induction Effects 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 238000009838 combustion analysis Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000001595 contractor effect Effects 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0223—Variable control of the intake valves only
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Testing Of Engines (AREA)
Abstract
本发明提供一种基于动态缸压确定发动机气门开启关闭时刻的方法，在发动机稳定运行过程中测量发动机缸内压力，然后通过缸压波动判断气门的关闭时刻，和现有方案相比，本发明在气门驱动机构正常运行的过程中测量气门的开启关闭时刻，可以充分考虑运动零部件的变形和惯性作用以及发动机温度对气门驱动机构的加热膨胀作用，得到的气门开启关闭时刻更为精确有效，具有显著的进步。
The present invention provides a method for determining the opening and closing timing of an engine valve based on dynamic cylinder pressure. The pressure in the engine cylinder is measured during the stable operation of the engine, and then the closing timing of the valve is judged by the fluctuation of the cylinder pressure. When the valve opening and closing time is measured during the normal operation of the valve drive mechanism, the deformation and inertia of the moving parts and the heating and expansion effect of the engine temperature on the valve drive mechanism can be fully considered, and the obtained valve opening and closing time is more accurate and effective. with significant progress.
Description
Technical field
The invention belongs to engine design fields, more particularly to when a kind of pressure judgement engine valve unlatching based on dynamic cylinder
The method at quarter.
Background technique
Up to now, engine is still one of most effective dynamic power machine, several especially in power train in vehicle application field
Occupy whole shares.Heat is released in fuel and air combustion reaction in engine, converts to export us by hot merit
The mechanical energy needed.In the process, the supply of fuel can be taking human as adjusting, but air needed for combustion reaction is not every time
Artificially can arbitrarily it increase.So for vehicular engine, circulation air inflow be restrict key factor that power improves it
One.
The raising of circulation air inflow depends on valve timing again.Currently, setting about the engine valve open and close moment
Meter technology comparative maturity.The colleges and universities such as University Of Tianjin, Beijing University of Science & Engineering of external major colleges and universities and research institution and the country
Polytechnics, university etc. has proposed the optimization design design method at engine valve open and close moment.But due to distribution
The thermal expansion and cold contraction effect of mechanism effect of inertia and components, the definite start-up time of valve is but in engine machine real-world operation
It is difficult to determine.
Determine at present the method at engine valve practical open and close moment mainly have one is: pacify on engine flywheel
Index dial is filled, the top dead centre of 0 point of corresponding engine piston on index dial opens the valve-chamber cover of engine, engine is rotated,
The scale value for observing when (or passing through apparatus measures) valve starts mobile and stopping index dial when movement, is started with this
The open and close moment of machine valve.This method is main due to being to measure valve opening close moment under engine static conditions
It has the disadvantage that:
1. having ignored the effect of inertia of the moving parts such as valve in high engine speeds operation process；
2. having ignored the components expanded by heating such as valve in engine operation process extends phenomenon；
3. using index dial it needs to be determined that the top dead centre of engine, engine tope center is difficult to really during actual measurement
It is fixed.
For these reasons, the valve opening close moment of this method measurement misses by a mile.
Summary of the invention
To solve the above problems, the present invention provide it is a kind of when determining the practical unlatching of valve according to cylinder in-cylinder pressure
The new method at quarter measures engine in-cylinder pressure in engine stabilizer operational process, then judges valve by cylinder pressure fluctuation
Close moment, can preferably solve the problems, such as that existing measurement method exists, obtained valve opening close moment is more smart
Truly have effect.
A method of it is pressed based on dynamic cylinder and determines the engine valve open and close moment, comprising the following steps:
Step 1: the distributive value of control engine (2) is zero, and is rotated with dynamometer machine (3) driving engine (2)；Measurement hair
The in-cylinder pressure of motivation (2), and the compression top center of engine (2) is obtained according to in-cylinder pressure；
Step 2: control dynamometer machine (3) stops working, and engine (2) also stops operating；Then control engine (2) starts
Oil spout is simultaneously again started up engine (2), after engine (2) run well, measures the in-cylinder pressure and engine of engine (2)
(2) crank angle, wherein reference zero of the compression top center as crank angle；Based on reference zero, according in this step
The in-cylinder pressure and crank angle of engine (2) obtain in-cylinder pressure curve and cylinder internal pressure when engine (2) run well
Curve of the power about engine (2) cylinder internal volume；
Step 3: rolling average processing is done to in-cylinder pressure curve obtained in step 2, obtain it is smooth after in-cylinder pressure
Curve；
Step 4: with the in-cylinder pressure curve in step 2 subtract in step 3 it is smooth after in-cylinder pressure curve, both obtain
Pressure difference curve；Wherein, the corresponding crank angle of fluctuation maximum point in pressure difference curve during induction stroke is exhaust valve
Close moment, the corresponding crank angle of fluctuation maximum point during compression stroke are the IC Intake Valve Closes moment；
Step 5: the IC Intake Valve Closes moment obtained according to step 4, on the theoretical lifting curve of engine (2) inlet valve
Valve actuating mechanism is found in IC Intake Valve Closes moment corresponding decrement, then in engine (2) inlet valve theory lifting curve
The corresponding crank angle of upper point identical with this decrement height for inlet valve start-up time；
Step 6: the abscissa to the in-cylinder pressure measured in step 2 about the curve of engine (2) cylinder internal volume respectively
And ordinate takes the logarithm with 2 for the truth of a matter, obtains logarithm P-V of the in-cylinder pressure about the curve of engine (2) cylinder internal volume
Figure；
Step 7: extended line being made to the expansion stroke section in logarithm P-V figure obtained in step 6, this extended line and logarithm P-
The burble point of V figure is the start-up time of exhaust valve.
A method of it is pressed based on dynamic cylinder and determines the engine valve open and close moment, in step 2 described in step 3
Obtained in-cylinder pressure curve does rolling average processing method particularly includes:
Using 1 crank angle degrees as section, and section is moved with setting to be spaced in crank angle reference axis, is successively calculated
The average value of all cylinder pressure data points in each section, and using average value as the corresponding pressure of interval midpoint crank angle
Force value, until traverse all sections, obtain it is smooth after in-cylinder pressure curve.
The utility model has the advantages that
The method proposed by the present invention that valve opening close moment is determined according to engine in-cylinder pressure, in engine stabilizer
Engine in-cylinder pressure is measured in operational process, and the close moment and existing scheme phase of valve are then judged by cylinder pressure fluctuation
Than the present invention measures the open and close moment of valve during valve actuating mechanism operates normally, and can fully consider fortune
Heating expansion of the deformation and effect of inertia and engine temperature of dynamic components to valve actuating mechanism, obtained valve
The open and close moment is more accurate effective, has significant progress.
Detailed description of the invention
Fig. 1 is a kind of structural representation that engraving device when determining engine valve open and close is pressed based on dynamic cylinder of the invention
Figure；
Fig. 2 is the in-cylinder pressure curve graph that engine of the invention is measured in not oil spout；
Fig. 3 is the in-cylinder pressure curve graph that the present invention is measured in normal working of engine；
Fig. 4 is inventive engine inlet valve lifting curve；
Fig. 5 is that the curve of cylinder internal volume of the present invention takes the logarithm P-V figure made with 2 logarithm for the truth of a matter；
Fig. 6 is that the present invention schemes partially enlarged figure to the logarithm P-V of Fig. 5；
1- in-cylinder pressure sensor, 2- engine, 3- dynamometer machine, 4- corner brace editing machine, 5- Combustion tester, P- cylinder internal pressure
Power, the difference of Deta-P- in-cylinder pressure P and its moving average, log-P- in-cylinder pressure.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention is described in detail.
Realize that technical scheme is as follows:
There are four ideal operation processes when engine operates: induction stroke, compression stroke, expansion stroke and exhaust punching
Journey.When valve opens and closes under ideal conditions, air-flow smoothly flows into and out cylinder, is not in pressure in cylinder
The phenomenon that power increases suddenly or declines suddenly.But in practical situations valve opening or close when, forcibly change
Air motion in cylinder necessarily causes the mutation of in-cylinder pressure, the pressure wave crest (or trough) of the generation after in-cylinder pressure mutation
It is propagated in cylinder internal reflection, causes in-cylinder pressure sustained oscillation whithin a period of time.The pressure wave is by valve opening or closing
Caused by, at the time of being exactly valve opening at the time of pressure wave occurs or close corresponding.Therefore, by measuring engine cylinder internal pressure
The fluctuation of power, it can be determined that the practical close moment of air intake-exhaust door.(a) after judging the close moment of inlet valve, according to
Total backlash of the available air inlet door drive mechanism of inlet valve theory lifting curve during IC Intake Valve Closes, IO Intake Valve Opens
The stress of air inlet door drive mechanism is similar in closing process in the process, so during the gap is also valve opening
The total backlash of valve actuating mechanism.Conversely, can determine opening for inlet valve in inlet valve theory lifting curve according to the gap
Open the moment.(b) in addition in expansion stroke, before exhaust valve is not turned on, gas in the jar substantially conforms to adiabatic expansion, in logarithm
In P-V figure, adiabatic expansion is a skew lines.After exhaust valve is opened, cylinder is discharged in gas in the jar, and in-cylinder pressure declines,
So when the burble point of actual measurement cylinder crimping and adiabatic expansion Molded Line is exactly the practical unlatching of exhaust valve in logarithm P-V figure
It carves.
As shown in Figure 1, engraving device when being a kind of engine valve open and close determining based on dynamic cylinder pressure of the invention
Structural schematic diagram, including engine 2, dynamometer machine 3, in-cylinder pressure sensor 1, corner brace editing machine 4 and Combustion tester 5.Cylinder
Pressure sensor 1 is mounted on 2 cylinder cap of engine, for measuring the in-cylinder pressure in 2 operation process of engine.Combustion analysis
Instrument 5 is used to receive the signal of in-cylinder pressure sensor 1.The peace of corner brace editing machine 4 turns in 2 flywheel side of engine, is Combustion tester 5
2 corner signal of engine is provided.
A method of it is pressed based on dynamic cylinder and determines the engine valve open and close moment, comprising the following steps:
Step 1: the distributive value of control engine 2 is zero, and drives engine 2 to rotate with dynamometer machine 3；Combustion tester 5
The in-cylinder pressure of the engine 2 measured by in-cylinder pressure sensor 1 is acquired, and the compression of engine 2 is obtained according to in-cylinder pressure
Top dead centre；It is illustrated in figure 2 the in-cylinder pressure curve graph that engine 2 of the invention is measured in not oil spout；
Step 2: control dynamometer machine 3 stops working, and engine (2) also stops operating；Then control engine (2) starts to spray
Oil is simultaneously again started up engine 2, after the normal operation of engine 2, in the cylinder using the measurement engine 2 of in-cylinder pressure sensor 1
Pressure, corner brace editing machine 4 measure the crank angle of engine 2, wherein reference zero of the compression top center as crank angle；Base
In reference zero, Combustion tester 5 obtains engine 2 normally according to the in-cylinder pressure of engine 2 and crank angle in this step
The curve of in-cylinder pressure curve and in-cylinder pressure about 2 cylinder internal volume of engine when operating, wherein compression top center is cylinder
The maximum of points of interior pressure is illustrated in figure 3 the in-cylinder pressure curve graph that engine 2 of the invention is measured when running well；
Step 3: rolling average processing is done to in-cylinder pressure curve obtained in step 2, obtain it is smooth after in-cylinder pressure
Curve；
Step 4: with the in-cylinder pressure curve in step 2 subtract in step 3 it is smooth after in-cylinder pressure curve, both obtain
Pressure difference curve；As shown in figure 3, by taking the pressure oscillation in induction stroke as an example, because when pressure oscillation amplitude originates thus compared with
Greatly, it is then gradually reduced, so this pressure wave is then to propagate in cylinder internal reflection as caused by external disturbance, finally fluctuate energy
Amount exhausts fluctuation and disappears, and in intake stroke, the disturbance source of in-cylinder pressure only one, that is, the unexpected pass of exhaust valve
It closes, therefore the corresponding crank angle of fluctuation maximum point in pressure difference curve during induction stroke is exhaust valve closing moment, pressure
The corresponding crank angle of fluctuation maximum point during contracting stroke is the IC Intake Valve Closes moment；The actual pass of exhaust valve as shown in Figure 3
It closes constantly as -341.7 degree.Similarly, it can determine that the IC Intake Valve Closes moment is -141.2 degree；
Step 5: as shown in figure 4, at the IC Intake Valve Closes moment obtained according to step 4, rise in the theory of 2 inlet valve of engine
Valve actuating mechanism is found on journey curve at IC Intake Valve Closes moment corresponding decrement (A point), then is managed in 2 inlet valve of engine
It is the start-up time of inlet valve by crank angle corresponding with this decrement identical B point of height on lifting curve, it can be with by Fig. 4
Determine that the IO Intake Valve Opens moment is -383 degree；
Step 6: respectively to the in-cylinder pressure measured in step 2 about the curve of 2 cylinder internal volume of engine abscissa with
And ordinate takes the logarithm with 2 for the truth of a matter, obtains the curve of in-cylinder pressure as shown in Figure 5 about engine 2 cylinder internal volume
Logarithm P-V figure；
Step 7: as shown in fig. 6, extended line is made to the expansion stroke section in logarithm P-V figure obtained in step 6, this extension
Line and logarithm P-V figure are in log2Burble point when V=0.5 is the start-up time of exhaust valve, and in log2Engine when V=0.5
Crank angle is 97.3 degree, so the exhauxt valve opens moment is 97.3 degree.
A method of it is pressed based on dynamic cylinder and determines the engine valve open and close moment, in step 2 described in step 3
Obtained in-cylinder pressure curve does rolling average processing method particularly includes:
Using 1 crank angle degrees as section, and section is moved with setting to be spaced in crank angle reference axis, is successively calculated
The average value of all cylinder pressure data points in each section, and using average value as the corresponding pressure of interval midpoint crank angle
Force value, until traverse all sections, obtain it is smooth after in-cylinder pressure curve.
Certainly, the invention may also have other embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding changes and modifications, but these corresponding changes and change in accordance with the present invention
Shape all should fall within the scope of protection of the appended claims of the present invention.
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| CN201710321912.2A CN107131060B (en) | 2017-05-09 | 2017-05-09 | A method of it is pressed based on dynamic cylinder and determines the engine valve open and close moment |
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| CN201710321912.2A CN107131060B (en) | 2017-05-09 | 2017-05-09 | A method of it is pressed based on dynamic cylinder and determines the engine valve open and close moment |
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| CN111189644A (en) * | 2020-03-06 | 2020-05-22 | 安徽华菱汽车有限公司 | Detection system for determining opening and closing time of air valve |
| CN116756621A (en) * | 2023-08-11 | 2023-09-15 | 北京理工大学 | On-line diagnosis method for air inlet and outlet faults of engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4967711A (en) * | 1988-07-29 | 1990-11-06 | Fuji Jukogyo Kabushiki Kaisha | Fuel injection control system for automotive engine |
| CN1906395A (en) * | 2004-10-07 | 2007-01-31 | 丰田自动车株式会社 | Device and method for controlling internal combustion engine |
| CN101907027A (en) * | 2009-06-08 | 2010-12-08 | 通用汽车环球科技运作公司 | Be used to produce the method and system of in-cylinder pressure sensor signal |
| CN102472196A (en) * | 2010-02-16 | 2012-05-23 | 丰田自动车株式会社 | In-cylinder pressure estimation device for internal combustion engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8286471B2 (en) * | 2009-01-13 | 2012-10-16 | Ford Global Technologies, Llc | Variable displacement engine diagnostics |
| US20120324989A1 (en) * | 2011-06-27 | 2012-12-27 | Caterpillar Inc. | System and method for diagnosis of engine component condition |
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- 2017-05-09 CN CN201710321912.2A patent/CN107131060B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4967711A (en) * | 1988-07-29 | 1990-11-06 | Fuji Jukogyo Kabushiki Kaisha | Fuel injection control system for automotive engine |
| CN1906395A (en) * | 2004-10-07 | 2007-01-31 | 丰田自动车株式会社 | Device and method for controlling internal combustion engine |
| CN101907027A (en) * | 2009-06-08 | 2010-12-08 | 通用汽车环球科技运作公司 | Be used to produce the method and system of in-cylinder pressure sensor signal |
| CN102472196A (en) * | 2010-02-16 | 2012-05-23 | 丰田自动车株式会社 | In-cylinder pressure estimation device for internal combustion engine |
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Inventor after: Li Yijie Inventor after: Shi Zhongjie Inventor after: Liu Fushui Inventor after: Kang Ning Inventor after: Yang Ziming Inventor before: Liu Fushui Inventor before: Shi Zhongjie Inventor before: Li Yijie Inventor before: Kang Ning Inventor before: Yang Ziming |