CN107620641A - Motor car engine ECU - Google Patents
Motor car engine ECU Download PDFInfo
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- CN107620641A CN107620641A CN201610561070.3A CN201610561070A CN107620641A CN 107620641 A CN107620641 A CN 107620641A CN 201610561070 A CN201610561070 A CN 201610561070A CN 107620641 A CN107620641 A CN 107620641A
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- Prior art keywords
- drain tap
- intake valve
- air intake
- egr
- ecu
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The motor car engine ECU of the present invention, it is characterised in that rotation speed monitoring unit, for monitoring engine speed value；Inlet channel pressure monitoring unit, for monitoring the pressure value after inlet channel choke valve；Memory cell, engine speed, inlet channel pressure and the corresponding air intake valve and/or the corresponding relation for being opened and closed angle of drain tap being stored with the state of it can enable EGR；Air intake valve timing control control unit and/or drain tap timing control control unit, the specified time for controlling air intake valve and/or drain tap to be stored according to memory cell open or close.In accordance with the invention it is possible to realize NOx emission reduction, and improve fuel economy.
Description
Technical field
The present invention relates to a kind of motor car engine ECU, more particularly to the starting motor-driven vehicle that can realize EGR controls
Machine ECU.
Background technology
Current environment pollution problem is increasingly obtained under the background of people's attention, and automobile production manufacturer will take various skills
Art means realize the reduction of discharge.Wherein, the control to NOx (nitrogen oxides) discharges is a very important technology mesh
Mark.
In existing engine control technologies, generally use enables EGR and (Exhaust Gas Recirculation, given up
Gas recycles) mode realize NOx emission reduction.When engine is under certain loading condiction, ECU can control engine
Open EGR.EGR operation principle is to reduce the gas temperature after burning by the high heat capacity of waste gas, so as to reduce NOx row
Put.Further, since gas temperature is relatively low after burning, the heat loss of engine also can correspondingly decline.But too high EGR amount meeting
Combustion instability is caused, too low EGR amount can not then give full play to the effect for reducing discharge, thus the control for EGR amount is
It is very important.
EGR can be divided into the outside class of EGR and internal EGR two according to different implementations.Outside EGR is to utilize outside dress
Put and the portion gas in exhaust passage is pumped into inlet channel.As a result of EGR valve, ECU can control EGR exactly
Flow, so as to the EGR rate in master cylinder.But due to needing extra installation external device (ED), this method costly, institute
Need structure also complex.Internal EGR is then by closing drain tap in advance in exhaust stroke, and portion is dammed
In cylinder；Either in the intake stroke, drain tap is again turned on, by portion suction cylinder.This method does not need volume
Outer device is realized, but can not quantitatively control EGR flow, it is impossible to which making full use of EGR to reach reduces the work of discharge
With.
In patent CN204851353U, a kind of bimodal admission cam shaft is applied to EGR realization.In admission cam shaft
On, admission cam and EGR cams are provided with, admission cam is used for the air inlet of engine, and EGR cams are used to realize that internal waste gas follow
Ring.When cylinder is in exhaust stroke, EGR cams open air intake valve so that waste gas enters inlet channel, so as to realize inside
EGR.But this method is essentially still no to be solved the problems, such as quantitatively to control EGR, and which increase extra machine
Tool structure, have impact on mechanical efficiency.
Existing internal EGR implementation method mainly closes drain tap in advance by exhaust stroke, or induction stroke is prolonged
What the method for close later drain tap was realized, and advance angle or delay angle for it is all can be fixed using EGR operating mode
's.This is unfavorable for fully excavating potentiality of the EGR for reducing NOx emission, can not meet the requirement of increasingly strict Abgasgesetz,
Thus we need to take other method to complete the accurate control to internal EGR, so as to realize lower NOx rows
Put.
The content of the invention
The present invention is to complete in view of the above problems, and its problem is to provide a kind of motor car engine ECU, and it is special
Sign is possess：Rotation speed monitoring unit, for monitoring engine speed value；Inlet channel pressure monitoring unit, for monitor into
Pressure value after gas passage choke valve；Memory cell, it is stored with the engine speed in the state of it can enable EGR, enters
Gas channel pressure and corresponding air intake valve and/or the corresponding relation at the opening and closing angle of drain tap；Air intake valve timing control control
Unit and/or drain tap timing control control unit processed, air intake valve and/or drain tap are controlled according to the memory cell
The specified time stored opens or closes.
According to the motor car engine ECU of the present invention, by determining each enable under EGR operating modes in calibration phase
The opening and closing angle of air intake valve and/or drain tap, so as to effectively utilize EGR effect, NOx emission reduction is realized, and improve
Fuel economy.
In addition, the motor car engine ECU of the present invention, it is preferable that oxygen content monitoring unit, for monitoring in waste gas
Oxygen content；Solar term valve opening control unit, according to the monitoring result of the oxygen content monitoring unit, control air throttle is adjusted
Whole aperture；When oxygen content in the offgas is not up to prescribed limit, the aperture of the air throttle is adjusted until in the waste gas
Oxygen content reach prescribed limit.Thereby, it is possible to ensure the safety discharge of waste gas.
In addition, the motor car engine ECU of the present invention, it is preferable that the memory cell, which is stored in, can enable EGR's
Under the different operating modes of engine under state, the variation coefficient (COV) of indicated mean effective pressure reaches or close to limiting value
When engine speed, inlet channel pressure and corresponding air intake valve and/or drain tap opening and closing angle corresponding relation.By
This, by determining the opening and closing angle of air intake valve and/or drain tap under each operating mode using COV as desired value, so as to have
Effect while realizing NOx emission reduction, and improve fuel economy, also ensures that the burning of engine is steady using EGR effect
It is qualitative.
In addition, the motor car engine ECU of the present invention, it is preferable that the air intake valve timing control unit, described
The monitor value of rotation speed monitoring unit and the inlet channel pressure monitoring unit the memory cell data storage scope it
When interior, driving air intake valve is opened according to the air intake valve opening angle earliest allowable recorded in the memory cell, and institute
Stating drain tap timing control unit makes drain tap be opened and closed according to conventional setting.By only controlling air intake valve opening angle with regard to energy
The optimal control in EGR mode is enough realized, so that ECU control is simplified.
In addition, the motor car engine ECU of the present invention, it is preferable that the earliest air intake valve allowable under each operating mode
Opening angle corresponds to air intake valve opening angle when EGR amount is EGR maximum allowable under the operating mode.Thereby, it is possible to ensuring to send out
In the case of motivation stability, NOx emission reduction is realized using EGR as much as possible.
In addition, the motor car engine ECU of the present invention, it is preferable that the drain tap timing control unit, described
The monitor value of rotation speed monitoring unit and the inlet channel pressure monitoring unit the memory cell data storage scope it
When interior, driving drain tap is closed angle opening according to the drain tap the latest allowable recorded in the memory cell also, entered
Air valve timing control unit is opened and closed according to conventional setting.Thus, it can be realized as EGR by only controlling drain tap to close angle
Optimal control in pattern, so that ECU control is simplified.
In addition, the motor car engine ECU of the present invention, it is preferable that the drain tap the latest allowable under each operating mode
Close the drain tap that angle corresponds to when EGR amount is EGR maximum allowable under the operating mode and close angle.Thereby, it is possible to ensuring to send out
In the case of motivation stability, NOx emission reduction is realized using EGR as much as possible.
In addition, the motor car engine ECU of the present invention, it is preferable that air intake valve timing control control unit and exhaust
Valve timing control control unit, in the monitor value of the rotation speed monitoring unit and the inlet channel pressure monitoring unit in institute
When stating within the scope of the data storage of memory cell, air intake valve and drain tap are driven respectively according to institute in the memory cell
The air intake valve opening angle earliest allowable of record and the combination of drain tap opening angle the latest are opened.Thereby, it is possible to more accurately
Realize the optimal control in EGR mode.
In addition, the motor car engine ECU of the present invention, it is preferable that the earliest air intake valve allowable under each operating mode
Opening angle and the latest drain tap are closed the air intake valve that angle corresponds to when EGR amount is EGR maximum allowable under the operating mode and opened
Angle and drain tap close the combination at angle.Thereby, it is possible in the case where ensuring engine stabilization, utilize EGR as much as possible
To realize NOx emission reduction.
The effect of invention
According to the motor car engine ECU of the present invention, NOx can be realized in the case where ensuring engine stabilization
Emission reduction, and improve fuel economy.
Brief description of the drawings
Fig. 1 is the applicable engine structure schematic diagrames of the ECU of the present invention.
Fig. 2 is the logical flow chart of first embodiment of the present invention calibration phase.
Fig. 3 is the control logic flow chart of first embodiment of the present invention.
Fig. 4 is the exhaust stroke waste gas flow schematic diagram that the present invention realizes.
Fig. 5 is the lift variation figure of first embodiment of the present invention difference operating mode air intake valve.
Fig. 6 is the logical flow chart of second embodiment of the present invention calibration phase.
Fig. 7 is the control logic flow chart of second embodiment of the present invention.
Fig. 8 is second embodiment of the present invention difference operating mode drain tap lift variation figure.
Fig. 9 is the logical flow chart of third embodiment of the present invention calibration phase.
Figure 10 is the control logic flow chart of third embodiment of the present invention.
Figure 11 is third embodiment of the present invention difference operating mode drain tap lift variation figure.
Embodiment
The present invention will be described in more detail with reference to the accompanying drawings and examples.
Describe motor car engine ECU involved in the present invention preferred embodiment in detail referring to the drawings.
In addition, in the description of the drawings, same symbol is accompanied by same or considerable part, the repetitive description thereof will be omitted.
<1st embodiment>
Fig. 1 is the structural representation of a kind of engine and its ECU that first embodiment of the present invention is applicable.Specifically, such as
Shown in Fig. 1, engine is made up of engine main body and coupled air inlet pipeline and gas exhaust piping.Match somebody with somebody in air inlet pipeline
Mass air flow sensor 1 is equipped with, gas temperature sensor is built-in with mass air flow sensor 1.It is configured with the downstream of mass air flow sensor 1
Pressure sensor 2.Compressor 3 is configured with the downstream of pressure sensor 2.Control is configured with the downstream of compressor 3 and enters gas
The air throttle 4 of air capacity in cylinder.Air throttle 4 is the electronic type that its valve opening can individually control independently of the aperture of gas pedal
Air throttle.The downstream of air throttle 4 is configured with gas pressure sensor 5, is hereafter connected with inlet manifold.In engine main body
In, it is configured with fuel injector 6 in the inside of cylinder.The fire that the gaseous mixture of fuel oil and air can be lighted is configured with the top of cylinder
Flower plug 7, and control air inlet, the timing mechanism 8 of drain tap switch.In the song being connected via connecting rod with the piston of cylinder
Speed probe 9 is configured with axle, the signal based on speed probe 9 and the rotating speed of engine can be obtained.In engine air
Gas pressure sensor 10 is configured with cylinder.Turbine 11 is configured with gas exhaust piping.Turbine 11 and 3 coaxial phase of compressor
Even, partial tail gas interior energy is converted into mechanical work and carrys out compressed air.Oxygen sensor 12 is configured in the downstream of turbine 11, according to oxygen
The testing result of sensor 12 reaches target air-fuel ratio to adjust distributive value.Catalysis is configured with the downstream of lambda sensor 12
Reforming unit 13, can be with the carbon monoxide in cleaning of off-gas, nitrogen oxides and hydrocarbon.All mechanism for monitoring and execution
Mechanism is all connected with ECU 14.
The 1st embodiment of the present invention, is by the adjustment of different operating mode lower inlet valve door opening times, with realization
Portion EGR.When cylinder is in the exhaust stroke later stage, control air intake valve is opened in advance, and portion introducing air inlet is led to
Road, this portion again in suction cylinder, is then realized into internal EGR in induction stroke.This implementation needs to use
Air intake valve timing control unit, corresponding valve opening time are the earliest opening angle of air intake valve that ECU 14 is recorded.
In calibration phase, for all EGR operating point can be used to carry out the demarcation of earliest air intake valve opening angle,
And record to ECU 14.Fig. 2 is a kind of this logical flow chart of implementation calibration phase.First, when operating mode changes
(201) engine speed value that, record speed probe 9 is monitored, and the air inlet that gas pressure sensor 5 is monitored
Channel pressure (202)；Secondly, if engine is in the opening angle under the operating mode that EGR can be enabled (203), adjusting air intake valve,
The pressure value returned according to gas pressure sensor 10 calculates the variation coefficient (COV) (204) of indicated mean effective pressure；When
When COV is reached the limit values, i.e., when engine combustion stability is in critical condition (205), air intake valve corresponding to record is opened
Angle, i.e., earliest air intake valve opening angle (206)；Finally, by air intake valve opening angle and engine speed value and inlet channel pressure
The corresponding relation of power is recorded to ECU 14, so as to terminate the demarcation of the operating mode (207).Herein, it is necessary to which explanation, above-mentioned optimal
In the scheme of choosing, earliest air intake valve opening angle corresponds to COV situations about reaching the limit values, but it is also possible to by earliest air inlet
Valve opening angle is set to correspond to COV close to the situation of limiting value, so as to ensure engine combustion stability, such setting
The effect essentially identical with optimal case can be obtained.Herein, it is contemplated that the difference between engine individual, in actual motion mistake
Cheng Zhong, the standard setting of COV limiting values can be demarcated to the 95% of limiting value according to the running situation of engine, or further
It is reduced to 90%, even 80%.
Fig. 3 is the control logic flow chart of the 1st embodiment.This control flow from engine start when come into effect, directly
Terminated during to engine misses.The present invention ECU control in, when monitor gas pedal 15 state change (301,
302) when, ECU 14 is monitored the engine speed value monitored according to speed probe 9 and gas pressure sensor 5
Inlet channel pressure judge whether that EGR (303,304) can be used.If EGR can be used, ECU 14 will tie according to demarcation
Air intake valve opening angle (305), control air intake valve are opened on time earliest corresponding to fruit selection.Hereafter, ECU 14 also needs to supervise
The signal (306) of lambda sensor 12 is controlled, if the oxygen content in waste gas not up to requires, ECU 14 will control solar term valve opening
Controlling organization adjusts the aperture (307) of air throttle 4, until reach will for oxygen content in the waste gas that is monitored of lambda sensor 12
Ask.After engine misses, the control terminates (308).
Fig. 4 is the exhaust stroke waste gas flow schematic diagram that the present invention realizes.In exhaust stroke, waste gas mainly passes through exhaust
Valve flows into exhaust passage.If adjusting the opening time of air intake valve, air intake valve is set to be opened in exhaust stroke, then portion
Inlet channel can be flowed into, realizes internal EGR.
Fig. 5 is a kind of this implementation air inlet, the lift variation figure of drain tap.For different operating modes, maximum allowable
EGR values are different, thus need to demarcate each operating mode its corresponding maximum EGR value allowable.Pass through preadmission valve
The opening time of door, the waste gas in cylinder can be expelled to air intake valve, and fully entered in induction stroke afterwards in cylinder；
And the exhausted air quantity discharged, and the time span positive correlation that air intake valve is opened in advance, thus had accordingly for different operating modes
Different earliest air intake valve opening angle (dashed lines with shown in chain-dotted line).And during this, the closing of drain tap
Angle keeps constant.
According to the 1st embodiment of the present invention, pass through the earliest air intake valve of each operating mode under prespecified EGR states
Opening angle, so as to realize maximum COVization under each EGR states.This way it is not necessary to existing engine structure is carried out
Improve, as long as changing the air intake valve opening angle under different EGR states, it becomes possible to EGR optimization is realized, so as to reduce NOx,
Realize fuel economy.
<2nd embodiment>
The 2nd embodiment of the present invention, the difference with the 1st embodiment are, when not changing the unlatching of air intake valve
Between, but by the adjustment of the shut-in time of drain tap under different operating modes, to realize internal EGR.Moreover, the 2nd embodiment
It can also apply in inlet channel carries out fuel-injected motor car engine.The method for adjusting the drain tap shut-in time
It is the current relatively conventional method for realizing internal EGR, by controlling drain tap late release in induction stroke early stage, by portion
Point waste gas again in suction cylinder, realizes internal EGR from exhaust passage；But this mode can not equally realize the accurate control of EGR amount
System.But by using method set forth in the present invention, demarcated, can be also realized to different works using method as described below
The maximized utilization of EGR effects under condition.Except that the requirement of this implementation uses drain tap timing control list
Member, corresponding valve shut-in time are that the drain tap that ECU 14 is recorded closes angle the latest.
In calibration phase, for all EGR operating point can be used to carry out the demarcation at the angle of drain tap closing the latest,
And record to ECU 14.Fig. 6 is the logical flow chart of the 2nd embodiment calibration phase.First, when operating mode changes (601),
The engine speed value that record speed probe 9 is monitored, and the inlet channel pressure that gas pressure sensor 5 is monitored
Power (602)；Secondly, if engine is in the closing angle under the operating mode that EGR can be enabled (603), adjusting drain tap, according to gas
The pressure value that pressure sensor 10 returns calculates the variation coefficient (COV) (604) of indicated mean effective pressure；When COV reaches
During limiting value, i.e., when engine combustion stability is in critical condition (605), drain tap corresponding to record closes angle, i.e., most
Late drain tap closes angle (606)；Finally, drain tap is closed into the corresponding of angle and engine speed value and inlet channel pressure
Relation record is to ECU 14, so as to terminate the demarcation of the operating mode (607).Herein, it is necessary to explanation, above-mentioned most preferred scheme
In, drain tap closes the situation that angle reaches the limit values corresponding to COV the latest, but it is also possible to drain tap will close the latest
Angle is set to correspond to COV close to the situation of limiting value, and so as to ensure engine combustion stability, such setting can obtain
The essentially identical effect with optimal case.Herein, it is contemplated that the difference between engine individual, can in actual moving process
According to the running situation of engine by the standard setting of COV limiting values for demarcation limiting value 95%, or be further reduced to
90%, even 80%.
Fig. 7 is the control logic flow chart of the 2nd embodiment.This control flow from engine start when come into effect, directly
Terminated during to engine misses.In the ECU of present invention control, when monitoring the state change of gas pedal 15 (701,
702), ECU 14 is monitored the engine speed value monitored according to speed probe 9 and gas pressure sensor 5
Inlet channel pressure judges whether that EGR (703,704) can be used.If EGR can be used, ECU 14 will be according to calibration result
Drain tap closes angle (705) the latest corresponding to selection, and control drain tap is closed on time.Hereafter, ECU 14 also needs to monitor
The signal (706) of lambda sensor 12, if the oxygen content in waste gas not up to requires that ECU 14 will control solar term valve opening control
The aperture (707) of institutional adjustment air throttle 4 processed, until oxygen content reaches requirement in the waste gas that lambda sensor 12 is monitored.
After engine misses, the control terminates (708).
Fig. 8 is the air inlet of the 2nd embodiment, the lift variation figure of drain tap.During by the unlatching of delayed exhaust valve
Between, the waste gas in exhaust duct can be sucked back in cylinder；And suck exhausted air quantity, and drain tap late release time span just
Correlation, thus have corresponding different drain tap the latest for different operating modes and close angle (dashed lines and chain-dotted line
It is shown).And during this, the opening angle of air intake valve keeps constant.
According to the 2nd embodiment of the present invention, pass through the drain tap the latest of each operating mode under prespecified EGR states
Angle is closed, so as to realize maximum COVization under each EGR states.This way it is not necessary to existing engine structure is carried out
Improve, as long as the drain tap changed under different EGR states closes angle, it becomes possible to EGR optimization is realized, so as to reduce NOx,
Realize fuel economy.
<3rd embodiment>
The 3rd embodiment of the present invention, it is different from the 1st and the 2nd embodiment, it is by different operating mode air inlets, air bleeding valve
Adjusted while the opening/closing time of door, to realize internal EGR.When cylinder is in the exhaust stroke later stage, intake valve is controlled
Door is opened in advance, and portion is introduced into inlet channel, then in induction stroke by this portion again in suction cylinder；Together
When in induction stroke early stage, drain tap late release is controlled, by portion from exhaust passage again in suction cylinder, in realization
Portion EGR.This implementation is needed simultaneously using air inlet, drain tap timing control unit, and corresponding valve opening time is not
The respective value of two kinds of implementations described above is same as, it is necessary to be determined by demarcating.
In calibration phase, for all earliest air intake valve opening angles and the latest of being carried out using EGR operating point
Drain tap closes the demarcation of angle combination, and records to ECU 14.Fig. 9 is a kind of this logical flow chart of method calibration phase.
First, when the engine speed value that operating mode is changed (901), and record speed probe 9 is monitored, and gas pressure pass
The inlet channel pressure (902) that sensor 5 is monitored；Secondly, if engine is under the operating mode that EGR can be enabled (903), adjust
The opening angle of whole air intake valve and the closing angle of drain tap, the pressure value returned according to gas pressure sensor 10 calculate average
Indicate the variation coefficient (COV) (904) of effective pressure；When COV is reached the limit values, i.e., engine combustion stability is in critical
During state (905), air intake valve opening angle corresponding to record and drain tap close angle (906), i.e., earliest air intake valve is opened
Angle and the latest drain tap close the combination at angle；Finally, air intake valve opening angle and drain tap are closed into angle with engine to turn
The corresponding relation of fast value and inlet channel pressure is recorded to ECU 14, so as to terminate the demarcation of the operating mode (907).Herein, it is necessary to
Illustrate, in above-mentioned most preferably scheme, earliest air intake valve opening angle and the latest drain tap are closed angle and reached corresponding to COV
To the situation of limiting value, it is set as correspondingly but it is also possible to which earliest air intake valve opening angle and the latest drain tap are closed into angle
Situation in COV close to limiting value, so as to ensure engine combustion stability, such setting can obtain and optimal case base
This identical effect.Herein, it is contemplated that the difference between engine individual, can be according to engine in actual moving process
Running situation by the standard setting of COV limiting values for demarcation limiting value 95%, or be further reduced to 90%, even
80%.
Figure 10 is the control logic flow chart of the 3rd embodiment.This control flow from engine start when come into effect, directly
Terminated during to engine misses.The present invention ECU control in, when monitor gas pedal 15 state change (1001,
1002) when, ECU 14 is monitored the engine speed value monitored according to speed probe 9 and gas pressure sensor 5
To inlet channel pressure judge whether that EGR (1003,1004) can be used.If EGR can be used, ECU 14 will be according to mark
Determine air intake valve opening angle and the latest drain tap closing angle combination (1005) earliest corresponding to result selection, control air intake valve
Open on time and drain tap is closed on time.Hereafter, ECU 14 also needs to monitor the signal (1006) of lambda sensor 12, if waste gas
In oxygen content not up to require, then ECU 14 will control air throttle opening controlling mechanism adjustment air throttle 4 aperture
(1007), until oxygen content reaches requirement in the waste gas that lambda sensor 12 is monitored.After engine misses, the control is whole
Only (1008).
Figure 11 is the 3rd embodiment air inlet, the lift variation figure of drain tap.During by the unlatching of preadmission valve
Between, the waste gas in cylinder can be expelled to air intake valve, and fully entered in induction stroke afterwards in cylinder；And discharge useless
Tolerance, and the time span positive correlation that air intake valve is opened in advance.By the shut-in time of delayed exhaust valve, will can be vented
Waste gas in road is sucked back in cylinder；And the exhausted air quantity sucked, and the time span positive correlation of drain tap late release are (empty in such as figure
Shown in line and chain-dotted line).Thus corresponding different earliest air intake valve opening angle is had for different operating modes and be vented the latest
Valve closes the combination at angle.
According to the 3rd embodiment of the present invention, by the way that above-mentioned 1st embodiment and the 2nd embodiment are combined, it becomes possible to
EGR optimization is better achieved, so as to reduce NOx, realizes fuel economy.
The ECU of the present invention is not limited to embodiment described above, and other various deformations are all possible.Though
So the present invention is illustrated above in association with drawings and examples, it will be appreciated that described above is not with any shape
The formula limitation present invention.Those skilled in the art without departing from the true spirit and scope of the present invention can be as needed
The present invention is deformed and changed, these deformations and change are within the scope of the present invention.
Claims (9)
- A kind of 1. ECU of engine of motor vehicle, it is characterised in thatPossess：Rotation speed monitoring unit, for monitoring engine speed value；Inlet channel pressure monitoring unit, for monitoring the pressure value after inlet channel choke valve；Memory cell, engine speed, inlet channel pressure and the corresponding air inlet being stored with the state of it can enable EGR The corresponding relation at the opening and closing angle of valve and/or drain tap；Air intake valve timing control control unit and/or drain tap timing control control unit, control air intake valve and/or row The specified time that air valve is stored according to the memory cell opens or closes.
- 2. ECU as claimed in claim 1, it is characterised in thatIt is also equipped with：Oxygen content monitoring unit, for monitoring the oxygen content in waste gas；Solar term valve opening control unit, according to the monitoring result of the oxygen content monitoring unit, control air throttle adjusts aperture,When oxygen content in the offgas is not up to prescribed limit, the aperture of the air throttle is adjusted up to the oxygen in the waste gas Gas content reaches prescribed limit.
- 3. ECU as claimed in claim 1, it is characterised in thatThe memory cell is stored under the different operating modes that can enable the engine in the state of EGR, and average instruction is effective The variation coefficient (COV) of pressure reaches or close to engine speed during limiting value, inlet channel pressure and corresponding intake valve The corresponding relation at the opening and closing angle of door and/or drain tap.
- 4. the ECU as described in any one in claims 1 to 3, it is characterised in thatThe air intake valve timing control unit, in the rotation speed monitoring unit and the prison of the inlet channel pressure monitoring unit For measured value when within the scope of the data storage of the memory cell, driving air intake valve is according to recorded in the memory cell Air intake valve opening angle earliest allowable is opened, and the drain tap timing control unit makes drain tap according to conventional setting Opening and closing.
- 5. ECU as claimed in claim 4, it is characterised in thatWhen air intake valve opening angle earliest allowable under each operating mode corresponds to that EGR amount is EGR maximum allowable under the operating mode Air intake valve opening angle.
- 6. the ECU as described in any one in claims 1 to 3, it is characterised in thatThe drain tap timing control unit, in the rotation speed monitoring unit and the prison of the inlet channel pressure monitoring unit For measured value when within the scope of the data storage of the memory cell, driving drain tap is according to recorded in the memory cell Drain tap the latest allowable closes angle opening also, air intake valve timing control unit is opened and closed according to conventional setting.
- 7. ECU as claimed in claim 6, it is characterised in thatWhen drain tap the latest allowable under each operating mode closes angle and corresponds to that EGR amount is EGR maximum allowable under the operating mode Drain tap close angle.
- 8. the ECU as described in any one in claims 1 to 3, it is characterised in thatAir intake valve timing control control unit and drain tap timing control control unit, in the rotation speed monitoring unit and institute The monitor value of inlet channel pressure monitoring unit is stated when within the scope of the data storage of the memory cell, drives air intake valve With drain tap respectively according to air intake valve opening angle and the drain tap the latest earliest allowable recorded in the memory cell The combination of opening angle is opened.
- 9. ECU as claimed in claim 8, it is characterised in thatAir intake valve opening angle earliest allowable and the angle of drain tap closing the latest under each operating mode correspond to EGR under the operating mode Measure for EGR maximum allowable when air intake valve opening angle and drain tap close angle combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610561070.3A CN107620641B (en) | 2016-07-15 | 2016-07-15 | ECU for motor vehicle engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610561070.3A CN107620641B (en) | 2016-07-15 | 2016-07-15 | ECU for motor vehicle engine |
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| CN107620641A true CN107620641A (en) | 2018-01-23 |
| CN107620641B CN107620641B (en) | 2022-04-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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