CN105911881A - Simulation method of variable valve timing mechanism - Google Patents
Simulation method of variable valve timing mechanism Download PDFInfo
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- CN105911881A CN105911881A CN201610230104.0A CN201610230104A CN105911881A CN 105911881 A CN105911881 A CN 105911881A CN 201610230104 A CN201610230104 A CN 201610230104A CN 105911881 A CN105911881 A CN 105911881A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000004088 simulation Methods 0.000 title abstract description 12
- 230000007246 mechanism Effects 0.000 title abstract description 6
- 230000010354 integration Effects 0.000 claims description 8
- 238000012360 testing method Methods 0.000 abstract description 19
- 238000012937 correction Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 7
- 230000008676 import Effects 0.000 description 3
- 238000004422 calculation algorithm Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000011990 functional testing Methods 0.000 description 1
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- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B17/00—Systems involving the use of models or simulators of said systems
- G05B17/02—Systems involving the use of models or simulators of said systems electric
Abstract
The invention discloses a simulation method of a variable valve timing mechanism. The method comprises the following steps of a first step, looking up in a table through utilizing an engine rotating speed as an input quantity for obtaining the maximal rotation angular speed of a phase regulator at the current engine rotating speed; a second step, looking up in the table through utilizing the duty ratio of an acquired variable valve timing valve timing valve control signal as the input quantity for obtaining a relative speed; a third step, looking up in a table for acquiring a certain correction factor for correcting the rotation angular speed; and a fourth step, integrating time by means of the rotation angular speed for obtaining the phase of an actual offset of a cam shaft. The second step is performed relative to a balance position. A positive value represents forward rotation, and a negative value represents backward rotation. An actual rotation speed is obtained through multiplying the maximal rotation angular speed with the relative speed. According to the simulation method, relatively low testing labor and relatively low test cost are realized, and a testing task is finished in a relatively short testing period.
Description
Technical field
The invention belongs to field of automobile electronic control, be specifically related to the emulation mode of a kind of VVT gear.
Background technology
It is known that along with the deep development of automobile industry, the controller on car gradually increases, control system is more
Come the most complicated.Meanwhile, in order to shorten the construction cycle to greatest extent, reduce development cost and reduce product entrance
Recalling risk behind market, hardware in loop (HIL) test plays increasing in the exploitation of control unit
Effect.Being tested by HIL, tester can configuration testing environment, the test manpower that less input flexibly
And testing cost, complete test assignment in shorter test period.For HIL tests, each controller
Will there is the controlled device phantom of correspondence with satisfied test needs.Along with the continuous upgrading of controlled device,
Controlled device phantom also should upgrade.As a example by electromotor, for meeting user to economy, dynamic
The pursuit of power and the most harsh emission request, occur in that VVT gear.The most just for
This newly-increased mechanism, carries out the upgrading of controlled device to HIL based on model test, and establishing can changing the flow of QI-blood
The simulation algorithm of door timing (VVT) mechanism.
Summary of the invention
According to above the deficiencies in the prior art, the present invention is directed to the VVT gear that electromotor is newly-increased, enter
The engine simulation model of row HIL test also should increase the phantom of this mechanism, the test manpower that less input
And testing cost, complete test assignment in shorter test period.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is: a kind of VVT gear
Emulation mode, the method comprises the following steps: step one, table look-up using engine speed as input quantity
MaxAngularSpeed obtains phase regulator maximum rotation angular velocity under present engine rotating speed；Step
Two, the dutycycle of the VVT valve control signal to collect is tabled look-up as input quantity
RelativeSpeed obtains relative velocity；Step 3, the CorrectFactor that tabled look-up by oil temperature are obtained
This velocity of rotation is modified by a certain modifying factor；Step 4, with this rotational angular velocity, the time is integrated
Obtain the actual phase value producing skew of camshaft.Described step 2, relative to equilbrium position, rotates forward on the occasion of representing,
Negative value represents reversion, and maximum rotation angular velocity is multiplied with relative velocity and obtains actual rotation speed.Described balance position
The dutycycle putting VVT valve control signal is 50%.Described step 3 is additionally provided with a low pass filter.
By gathering air inlet VVT and the control signal dutycycle of exhaust variable valve timing, simulation is adopted respectively
Collection air inlet VVT and the phase pushing figure of exhaust variable valve timing.The method is by adjusting integration mould
The integration time constant of block carrys out adjustment cam axle rotational angular velocity.The method is adjustable by regulation VVT
The angular range of joint, the deviation angle upper limit that adjustment cam axle is actual.
The medicine have the advantages that phantom is compared to control signal (PWM) duty of VVT valve
Input for main, and according to current engine speed and oil temperature correction, simulation calculates air inlet respectively
Oil flow rate in VVT and aerofluxus VVT, and go out the angular velocity of cam axle according to this flow simulation, finally
Integration goes out phase offset angle.This mechanism is simulated the change of the present camshaft angle of effect final body.This mould
Admission cam shaft and the exhaust cam shaft camshaft phase after phase regulator regulates can independently be simulated by type
Position deviation angle, and ensure that the camshaft actual angle of simulation approximates in real time with the angle on target of ECU demand for control
Equal, therefore can be used for the self study of VVT, diagnosis and the functional test relevant to control.
Accompanying drawing explanation
Below the content expressed by this specification accompanying drawing and the labelling in figure are briefly described:
Fig. 1 is the VVT gear schematic diagram of the specific embodiment of the invention.
Fig. 2 is the VVT valve rating curve figure of the specific embodiment of the invention.
Fig. 3 is the VVT gear simulation architecture figure of the specific embodiment of the invention.
Fig. 4 is the simulation design sketch of the import/exhaust VVT of the specific embodiment of the invention.
In Fig. 1,1, camshaft phase adjuster；2, CMPS Camshaft Position Sensor；3, crank position sensing
Device；4, VVT valve；5, lubricating oil pump.
Detailed description of the invention
Below against accompanying drawing, by the description to embodiment, the most involved each of the detailed description of the invention of the present invention
Mutual alignment and annexation, the effect of each several part between the shape of component, structure, each several part and work former
Reason, manufacturing process and operate with method etc., be described in further detail, to help those skilled in the art
Inventive concept, the technical scheme of the present invention there is more complete, accurate and deep understanding.
VVT gear is as shown in Figure 1, it is assumed that the oil pressure in VVT valve hydraulic cavities is fixing not
Become, then the oil flow rate that the side-play amount (angle) of camshaft phase is proportional in hydraulic cavities, flow is by electromagnetic valve
Duty ratio control, flow can be obtained by the characteristic of electromagnetic valve with the relation of dutycycle.During ECU work, control
System strategy can calculate the target cam shaft angle degree of current working demand, and exports corresponding PWM duty cycle,
By gathering the dutycycle of this control signal, the oil flow rate in hydraulic cavities can be simulated.
Owing to corresponding phase regulator maximum stream flow under different oil pressure is definite value, therefore the rotation of its maximum
Angular velocity is definite value.Therefore, this rotating speed can be calculated by engine speed the function of rotating speed (engine oil pressure be)
Under peak excursion angular velocity.Under the conditions of different duty electromagnetic valve oil flow rate as in figure 2 it is shown, itself and
The big relation of flow is consistent with the relation of engine speed and phase regulator maximum rotation angular velocity, passes through
This relation can calculate the rotational angular velocity of phase regulator under current duty cycle.By angular velocity, the time is carried out
Integration can be obtained by camshaft actual angle side-play amount after phase regulator drives.
Specific implementation is: using engine speed n_Engine as input quantity table look-up acquisition phase regulator exist
Maximum rotation angular velocity under present engine rotating speed.With accounting for of the VVT valve control signal that collects
Empty table look-up acquisition relative velocity (-1～1) as input quantity than PWM_DutyCycle.(account for relative to equilbrium position
Empty ratio is 50%) for, rotating forward on the occasion of representing, negative value represents reversion, maximum rotation angular velocity and relative velocity
It is multiplied and obtains actual rotation speed.Table look-up a certain modifying factor of acquisition to this rotation again by oil temperature T_Oil
Speed is modified.Meanwhile, algorithm with the addition of a low pass filter VVT_LPT, to prevent this angle
Speed simulation process occurs step saltus step.Finally it is integrated obtaining camshaft to the time with this rotational angular velocity
The actual phase value OffsetAngle producing skew.Owing to air inlet VVT is identical with the operation principle of aerofluxus VVT,
Therefore its phantom is the most identical, by gathering the control signal dutycycle of air inlet VVT and aerofluxus VVT respectively,
Respective phase pushing figure can be simulated.Final phantom and variable are as shown in Figure 3 and Table 1.
Table 1 mode input output variable
| Variable | Describe | Unit |
| n_Engine | Engine speed | rpm |
| PWM_DutyCycle | VVT control signal dutycycle | % |
| T_Oil | Oil temperature | ℃ |
| OffsetAngle | Phase offset angle | ° |
From described above, the principal element affecting VVT control phase accuracy has the velocity of rotation of VVT, maximum
Deviation angle.The former directly affects camshaft actual angle and angle on target is followed effect, can be long-pending by adjusting
Integration time constant dT of sub-module carrys out adjustment cam axle rotational angular velocity；Another influence factor is VVT scalable
Angular range, directly influence the deviation angle upper limit that camshaft is actual.Other factors can play camshaft
The correction effect of deviation angle.Therefore, debugging needs the step done to have: (1) determines that the target that VVT controls is opened
Degree scope；(2) adjust the integral constant (dT) of VVT, make actual phase angle and target phase angle followability
Reach requirement.
Understanding in conjunction with a certain Edition Control Strategy calibration value, the target range of phase controlling is by VVT: air inlet
VVT adjustable extent is-21 ° to 49 °, i.e. scalable intake valve after air inlet TDC 21 ° to TDC first 49 °
In the range of open；Aerofluxus VVT adjustable extent is-30 ° to 40 °, and i.e. scalable air bleeding valve is at aerofluxus TDC
Close to first 40 ° of TDC for latter 30 °.Therefore, the peak excursion angle (Shift_MX) of intake and exhaust VVT
It is 70 °.Final debugging uses parameter as shown in table 2.
Table 2 import/exhaust VVT analog parameter table
| Title | Integration time constant | Peak excursion angle |
| Air inlet VVT | 0.002 | 70 |
| Aerofluxus VVT | 0.003 | 70 |
Table 3 import/exhaust VVT observational variable
| Variable | Describe |
| wnwse_w | Air inlet VVT controls camshaft angle on target during INO |
| wnwvfe_w | The camshaft actual angle that air inlet VVT controls |
| wnwsa_w | Aerofluxus VVT controls camshaft angle on target during exhaust valve closure |
| wnwvfa_w | The camshaft actual angle that aerofluxus gas VVT controls |
Run the operating mode set by HIL equipment, verify the control effect of VVT, as shown in table 3 and fig. 4.
The angle on target wnwse_w of admission cam shaft demand is solid line 1, and actual camshaft angle wnwvfe_w is empty
Line 2；The angle on target wnwsa_w of exhaust cam shaft demand is solid line 3, actual camshaft angle wnwvfa_w
For dotted line 4.As shown in Figure 4, air inlet VVT and aerofluxus VVT controls the actual angle of camshaft to angle on target
Followability is good, and the actual angle of camshaft can change and quickly governing response along with the angle on target of demand,
And the angle of camshaft skew is in the range of setting, simulation effect is sufficient for test request.
Above in conjunction with accompanying drawing, the present invention is exemplarily described, it is clear that the present invention implements not by above-mentioned
The restriction of mode, as long as have employed changing of the various unsubstantialities that method is conceived and technical scheme is carried out of the present invention
Enter, or the most improved design by the present invention and technical scheme directly apply to other occasion, all in the present invention
Protection domain within.Protection scope of the present invention should be as the criterion with the protection domain that claims are limited.
Claims (7)
1. the emulation mode of a VVT gear, it is characterised in that the method comprises the following steps:
Step one, using engine speed as input quantity table look-up acquisition phase regulator maximum rotation under present engine rotating speed
Angular velocity；
Step 2, table look-up acquisition relative velocity using the dutycycle of VVT valve control signal that collects as input quantity；
This velocity of rotation is modified by step 3, a certain modifying factor of acquisition of being tabled look-up by oil temperature；
Step 4, it is integrated the time obtaining the actual phase value producing skew of camshaft with this rotational angular velocity.
The emulation mode of VVT gear the most according to claim 1, it is characterised in that described step 2 is relative
In equilbrium position, rotating forward on the occasion of representing, negative value represents reversion, and maximum rotation angular velocity is multiplied with relative velocity and obtains actual rotation
Speed.
The emulation mode of VVT gear the most according to claim 2, it is characterised in that described equilbrium position can
The dutycycle of air valve variation timing valve control signal is 50%.
The emulation mode of VVT gear the most according to claim 1, it is characterised in that step 3 is additionally provided with one
Individual low pass filter.
The emulation mode of VVT gear the most according to claim 1, it is characterised in that can by gathering air inlet
The control signal dutycycle of air valve variation timing and exhaust variable valve timing, respectively analog acquisition air inlet VVT and aerofluxus
The phase pushing figure of VVT.
The emulation mode of VVT gear the most according to claim 1, it is characterised in that the method is by adjusting
The integration time constant of integration module carrys out adjustment cam axle rotational angular velocity.
The emulation mode of VVT gear the most according to claim 1, it is characterised in that the method is by regulation
The adjustable angular range of VVT, the deviation angle upper limit that adjustment cam axle is actual.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610230104.0A CN105911881B (en) | 2016-04-14 | 2016-04-14 | A kind of emulation mode of VVT gear |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610230104.0A CN105911881B (en) | 2016-04-14 | 2016-04-14 | A kind of emulation mode of VVT gear |
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| CN105911881A true CN105911881A (en) | 2016-08-31 |
| CN105911881B CN105911881B (en) | 2019-03-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108571351A (en) * | 2017-03-08 | 2018-09-25 | 福特环球技术公司 | Method and system for variable cam timing control |
| CN111289253A (en) * | 2018-12-07 | 2020-06-16 | 上海汽车集团股份有限公司 | Method, device and system for determining intake and exhaust phases of engine |
Citations (6)
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|---|---|---|---|---|
| CN101749065A (en) * | 2009-12-24 | 2010-06-23 | 奇瑞汽车股份有限公司 | Variable valve timing (VVT) adjusting method of engine and device |
| JP4545127B2 (en) * | 2006-09-15 | 2010-09-15 | 株式会社デンソー | Valve timing adjustment device |
| CN102312744A (en) * | 2010-06-30 | 2012-01-11 | 马自达汽车株式会社 | The DENG that is used for vehicle |
| CN102374038A (en) * | 2011-09-06 | 2012-03-14 | 天津大学 | VVT (Variable Valve Timing) control method capable of combining self-learning feed-forward and active anti-interference feedback |
| CN104421024A (en) * | 2013-08-22 | 2015-03-18 | 马自达汽车株式会社 | Method and device for controlling multi-cylinder engine |
| CN104421017A (en) * | 2013-08-22 | 2015-03-18 | 马自达汽车株式会社 | Control device of multi-cylinder engine |
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2016
- 2016-04-14 CN CN201610230104.0A patent/CN105911881B/en active Active
Patent Citations (6)
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|---|---|---|---|---|
| JP4545127B2 (en) * | 2006-09-15 | 2010-09-15 | 株式会社デンソー | Valve timing adjustment device |
| CN101749065A (en) * | 2009-12-24 | 2010-06-23 | 奇瑞汽车股份有限公司 | Variable valve timing (VVT) adjusting method of engine and device |
| CN102312744A (en) * | 2010-06-30 | 2012-01-11 | 马自达汽车株式会社 | The DENG that is used for vehicle |
| CN102374038A (en) * | 2011-09-06 | 2012-03-14 | 天津大学 | VVT (Variable Valve Timing) control method capable of combining self-learning feed-forward and active anti-interference feedback |
| CN104421024A (en) * | 2013-08-22 | 2015-03-18 | 马自达汽车株式会社 | Method and device for controlling multi-cylinder engine |
| CN104421017A (en) * | 2013-08-22 | 2015-03-18 | 马自达汽车株式会社 | Control device of multi-cylinder engine |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108571351A (en) * | 2017-03-08 | 2018-09-25 | 福特环球技术公司 | Method and system for variable cam timing control |
| CN108571351B (en) * | 2017-03-08 | 2022-03-04 | 福特环球技术公司 | Method and system for variable camshaft timing control |
| CN111289253A (en) * | 2018-12-07 | 2020-06-16 | 上海汽车集团股份有限公司 | Method, device and system for determining intake and exhaust phases of engine |
| CN111289253B (en) * | 2018-12-07 | 2022-07-22 | 上海汽车集团股份有限公司 | Method, device and system for determining intake and exhaust phases of engine |
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