CN109372660A - A kind of protection system of EGR cooling gas check valve, method and vehicle - Google Patents
A kind of protection system of EGR cooling gas check valve, method and vehicle Download PDFInfo
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- CN109372660A CN109372660A CN201811533231.3A CN201811533231A CN109372660A CN 109372660 A CN109372660 A CN 109372660A CN 201811533231 A CN201811533231 A CN 201811533231A CN 109372660 A CN109372660 A CN 109372660A
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- value
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
- F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0065—Specific aspects of external EGR control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/65—Constructional details of EGR valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0065—Specific aspects of external EGR control
- F02D2041/0067—Determining the EGR temperature
Abstract
The present invention provides a kind of protection system of EGR cooling gas check valve, method and vehicle, comprising: ECU module, cooler for recycled exhaust gas, engine, exhaust pipe, EGR control valve, check valve and temperature sensor；Engine, exhaust pipe, EGR control valve, cooler for recycled exhaust gas, check valve are sequentially connected；Temperature sensor is arranged close to the output end of check valve；Temperature sensor and EGR control valve are electrically connected with ECU module respectively；Temperature sensor is used to incude the EGR exhaust temperature of check valve output end discharge；The high temperature impact of moment can be effectively relieved in the present invention, avoid EGR check valve by the destruction of high-temperature gas.
Description
Technical field
The present invention relates to the protection systems and side of diesel engine technologies field more particularly to a kind of EGR cooling gas check valve
Method.
Background technique
Compared with state's V technology, VI standard of state is more harsh to diesel emission limitation, and exhaust gas recycles (EGR) technology
Using being current to reduce diesel engine NOXOne of major measure of discharge.EGR check valve is guaranteed in diesel engine for automobile EGR technology
One of the critical component of slow-speed of revolution EGR rate, whether EGR check valve, which works normally, directly influences engine fuel economy or even shadow
Ring vehicle discharge.
EGR check valve is mounted on cooler for recycled exhaust gas downstream, is avoided that the refluence of fresh air in engine charge pipeline.It is single
Plastic construction product on valve has heatproof limit value (lower than 230 DEG C).If engine combustion or cooling system break down,
Temperature can be far more than calibration value, after meeting or exceeding the limit value that check valve can be born after EGR is cooling, and plastics are easy to be burned out
Valve block is caused to fall off failure of check valve, and the steel valve block to fall off may enter combustion chamber by air inlet pipe, cause brokenly to engine
Bad, it is necessary for taking certain safeguard measure to EGR check valve.
Current Preservation tactics be after EGR temperature be more than limit value after directly close EGR valve, after several seconds if after EGR
Temperature is lower than limit value, and ECU opens EGR valve according to Closed-loop Control Strategy.Since the aperture that EGR valve is again turned on is not calculated by closed loop
Except constraint, it is excessive to may cause EGR valve aperture, after EGR after temperature excessively high so as to cause EGR gas temperature after cooling
Sensor measures temperature more than EGR valve is closed after limit value again, so be easy to cause check valve to bear amplitude of variation repeatedly very big
Cooling thermal impact.To accelerate check valve to damage.
Summary of the invention
In order to overcome the deficiencies in the prior art described above, the present invention provides a kind of protection system of EGR cooling gas check valve, packet
It includes: ECU module, cooler for recycled exhaust gas, engine, exhaust pipe, EGR control valve, check valve and temperature sensor；
Engine, exhaust pipe, EGR control valve, cooler for recycled exhaust gas, check valve are sequentially connected；
Temperature sensor is arranged close to the output end of check valve；
Temperature sensor and EGR control valve are electrically connected with ECU module respectively；
Temperature sensor is used to incude the EGR exhaust temperature of check valve output end discharge；
ECU module is used to obtain the EGR exhaust temperature values of temperature sensor senses, and by the EGR exhaust temperature value of induction
It is compared with preset threshold, when EGR exhaust temperature exceeds threshold value, ECU module adjusts the aperture of EGR control valve, makes temperature
The EGR exhaust temperature of sensor sensing reaches in threshold range.
Preferably, ECU module is T for obtaining preset unidirectional valve protection limit value ceiling temperatureH；Obtain unidirectional valve protection
Limit value lower limit is TL；
It is also used to the EGR exhaust temperature value T that ECU module is obtained by temperature sensor0Lower than under unidirectional valve protection limit value
Limit TLWhen, ECU module control EGR control valve is maintained in the first aperture threshold range；
As the EGR exhaust temperature value T that ECU module is obtained by temperature sensor0Higher than unidirectional valve protection limit value lower limit TL,
And when being lower than unidirectional valve protection limit value ceiling temperature TH, ECU module control EGR control valve is maintained at the second aperture threshold range
It is interior；
As the EGR exhaust temperature value T that ECU module is obtained by temperature sensor0Higher than unidirectional valve protection limit value upper limit temperature
Spend THWhen, ECU module control EGR control valve is maintained in third aperture threshold range.
Preferably, ECU module is also used to configure protection correction factor k；
Protection correction factor k is formula: k=T0/T1* α or k=T0/T1+ α or k=T0/T1-α；
T0It is the desired value of engine exhaust gas temperature after EGR cooling under each operating condition；
T1It is exhaust gas temperature actual value after the EGR of ECU module (1) acquisition is cooling；
Side reaction coefficient is a preset constant；The value of k is less than 1；
Work as T1Higher than THWhen, it is modified using aperture of the correction factor k to EGR control valve, the temperature after making EGR control valve
Spend T1It approaches and is lower than protection limitation lower limit TL；Temperature is lower than protection limitation lower limit T after EGR control valveLAfterwards, cancel protection to repair
Just.
Preferably, the valve block of check valve is Steel material, and valve seat and valve deck are plastic part, and air-flow can only be unidirectional from steel valve block
Opening passes through；On valve seat, valve deck limits the maximum opening of valve block for steel disc riveting, can valve block be made to fall off when valve seat or valve deck are impaired
Into air inlet pipeline.
A kind of guard method of EGR cooling gas check valve, method include:
The EGR exhaust temperature of temperature sensor senses check valve output end discharge, and the EGR exhaust temperature of induction is transmitted
To ECU module；
ECU module obtains the EGR exhaust temperature value of temperature sensor senses, and by the EGR exhaust temperature value of induction and in advance
If threshold value is compared；
When EGR exhaust temperature exceeds threshold value, ECU module adjusts the aperture of EGR control valve, reduces exhaust pipe and arranges exhaust gas
Amount, after cooler for recycled exhaust gas handles exhaust gas, reaches the EGR exhaust temperature of temperature sensor senses in threshold range.
Preferably, method further include:
It is T that ECU module, which obtains preset unidirectional valve protection limit value ceiling temperature,H；Obtaining unidirectional valve protection limit value lower limit is
TL；
The EGR exhaust temperature value T that ECU module is obtained by temperature sensor0Lower than unidirectional valve protection limit value lower limit TLWhen,
ECU module control EGR control valve is maintained in the first aperture threshold range；
As the EGR exhaust temperature value T that ECU module is obtained by temperature sensor0Higher than unidirectional valve protection limit value lower limit TL,
And it is lower than unidirectional valve protection limit value ceiling temperature THWhen, ECU module control EGR control valve is maintained at the second aperture threshold range
It is interior；
As the EGR exhaust temperature value T that ECU module is obtained by temperature sensor0Higher than unidirectional valve protection limit value upper limit temperature
Spend THWhen, ECU module control EGR control valve is maintained in third aperture threshold range；
First aperture threshold range is greater than the second aperture threshold range, and the second aperture threshold range is greater than third aperture threshold value
Range.
Preferably, method further include:
Configuration protection correction factor k；
Protection correction factor k is formula: k=T0/T1* α or k=T0/T1+ α or k=T0/T1-α；
T0It is the desired value of engine exhaust gas temperature after EGR cooling under each operating condition；
T1It is exhaust gas temperature actual value after the EGR of ECU module acquisition is cooling；
Side reaction coefficient is a preset constant；The value of k is less than 1；
Work as T1Higher than THWhen, it is modified using aperture of the correction factor k to EGR control valve, the temperature after making EGR control valve
Spend T1It approaches and is lower than protection limitation lower limit TL；Temperature is lower than protection limitation lower limit T after EGR control valveLAfterwards, cancel protection to repair
Just.
A kind of vehicle with EGR gas unidirectional valve protection, comprising: the protection system of EGR cooling gas check valve.
As can be seen from the above technical solutions, the invention has the following advantages that
The present invention makes EGR check valve avoid damaging when high temperature gas flow is swept away.If the unidirectional valve protection limit of EGR
The value upper limit is TH, then exhaust gas temperature T after EGR is cooling1Higher than THWhen, it is fed back via exhaust gas temperature sensor after EGR cooling,
ECU is received according to the arteries and veins spectrogram set after temperature signal, and ECU exports corrected EGR control valve setting value, and holds to EGR
Row unit issues corresponding operation instruction, turns down the practical aperture of EGR control valve, and improve SCR efficiency, to guarantee that engine is arranged
It puts.Gas temperature is lower than protection limit value lower limit T after EGR is coolingLLater, EGR valve gradually restores normal mode.
The high temperature impact of moment can be effectively relieved in the present invention, avoid EGR check valve by the destruction of high-temperature gas.
Detailed description of the invention
In order to illustrate more clearly of technical solution of the present invention, attached drawing needed in description will be made below simple
Ground introduction, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ordinary skill
For personnel, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the protection system schematic of EGR cooling gas check valve；
Fig. 2 is the correction factor tendency chart of EGR control valve.
Specific embodiment
The present invention provides a kind of protection system of EGR cooling gas check valve, as shown in Figure 1, comprising: ECU module 1, EGR are cooling
Device 2, engine 3, exhaust pipe 4, EGR control valve 5, check valve 6 and temperature sensor 7；
Engine 3, exhaust pipe 4, EGR control valve 5, cooler for recycled exhaust gas 2, check valve 6 are sequentially connected；Temperature sensor 7 is close
The output end of check valve 6 is arranged；Temperature sensor 7 and EGR control valve 5 are electrically connected with ECU module 1 respectively；Temperature sensor 7 is used
In the EGR exhaust temperature of induction 6 output end of check valve discharge；ECU module 1 is used to obtain the EGR exhaust of the induction of temperature sensor 7
Temperature value, and the EGR exhaust temperature value of induction is compared with preset threshold, when EGR exhaust temperature exceeds threshold value, ECU
Module 1 adjusts the aperture of EGR control valve 5, and the EGR exhaust temperature for incuding temperature sensor 7 reaches in threshold range.
In the present invention, ECU module 1 is T for obtaining preset unidirectional valve protection limit value ceiling temperatureH；Obtain check valve
Protection limit value lower limit is TL；It is also used to ECU module 1 and passes through the EGR exhaust temperature value T that temperature sensor 7 obtains0Lower than check valve
Protect limit value lower limit TLWhen, ECU module 1 controls EGR control valve 5 and is maintained in the first aperture threshold range；When ECU module 1 is logical
The EGR exhaust temperature value T that excess temperature sensor 7 obtains0Higher than unidirectional valve protection limit value lower limit TL, and limited lower than unidirectional valve protection
It is worth ceiling temperature THWhen, ECU module 1 controls EGR control valve 5 and is maintained in the second aperture threshold range；When ECU module 1 passes through
The EGR exhaust temperature value T that temperature sensor 7 obtains0Higher than unidirectional valve protection limit value ceiling temperature THWhen, ECU module 1 controls EGR
Control valve 5 is maintained in third aperture threshold range.
Description and claims of this specification and term " first ", " second ", " third " " in above-mentioned attached drawing
Four " etc. if there is being to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that
The data used in this way are interchangeable under appropriate circumstances, so that the embodiment of the present invention described herein can be in addition at this
In illustrate or description those of other than sequence implement.In addition, term " includes " and " having " and their any deformation, meaning
Figure, which is to cover, non-exclusive includes.
In the present invention, ECU module 1 is used to obtain the trend of EGR control valve set point correct coefficient k, and ECU module 1 is also used
Correction factor k is protected in configuration；Protection correction factor k is formula: k=T0/T1* α or k=T0/T1+ α or k=T0/T1-α；T0
It is the desired value of engine exhaust gas temperature after EGR cooling under each operating condition；T1It is exhaust gas temperature after the EGR of the acquisition of ECU module 1 is cooling
Spend actual value；Side reaction coefficient is a preset constant；The value of k is less than 1；Work as T1Higher than THWhen, EGR is controlled using correction factor k
The aperture of valve is modified, the temperature T after making EGR control valve1It approaches and is lower than protection limitation lower limit TL；Temperature after EGR control valve
Degree is lower than protection limitation lower limit TLAfterwards, cancel protection amendment.
It should be further noted that EGR exhaust comes out from the exhaust pipe of engine, is controlled and flowed by EGR control valve aperture
Amount, gas temperature reaches as high as more than 600 DEG C, need to be cooling by cooler for recycled exhaust gas, it is cooling after gas open check valve flow into
Air pipe finally enters combustion chamber.There is a temperature sensor behind check valve, measures EGR exhaust temperature after cooling, and will
Temperature signal passes to ECU.
One-way valve plate is Steel material, and valve seat and valve deck are plastic part, and air-flow can only unidirectionally be opened from steel valve block to be passed through.
On valve seat, valve deck limits the maximum opening of valve block for steel disc riveting, when valve seat or valve deck are impaired may make valve block shed into
Air pipe.
The protection limit value upper limit of plastic part is T on check valveH.If engine combustion or cooling system break down, EGR
Temperature can be far more than calibration value, in this patent scheme, when the temperature rises to T after coolingHWhen, temperature sensor can be by signal
Passing to ECU, ECU is received after temperature signal according to the arteries and veins spectrogram 2 of calibration, corrected EGR control valve setting value is exported,
And corresponding operation instruction is issued to EGR execution unit, reduce the practical aperture of EGR control valve.EGR control valve set point correct
The trend of coefficient k is as shown in Fig. 2, and ECU module 1 is also used to configuration modifications coefficient k；Correction factor k is formula: k=T0/T1* α,
T0It is the desired value of engine exhaust gas temperature after EGR cooling under each operating condition.Computation model is preset in ECU arteries and veins Pu Tuli.
T1It is exhaust gas temperature actual value after the EGR of the acquisition of ECU module 1 is cooling；
Side reaction coefficient is that (simple uses T to a constant set in ECU arteries and veins Pu Tuli0/T1Value correct the aperture of valve
It is not able to satisfy actual needs, in actual motion on the one hand the adjustment of EGR control valve is needed to meet the requirement discharged, on the other hand
Temperature sensor obtains actual value and needs certain time, while also being influenced by signal response problem, so k value also needs other systems
Several coordinations, formula are also possible to k=T0/T1+ α, k=T0/T1- α, k=T0/T1* alpha+beta etc., can be on test-bed really
Determine optimum formula and is then set in ECU arteries and veins Pu Tuli.
K is a value less than 1
Work as T1Higher than THWhen, it is modified using aperture of the correction factor k to EGR control valve, the temperature after making EGR control valve
Spend T1It approaches and is lower than protection limitation lower limit TL；Temperature is lower than protection limitation lower limit T after EGR control valveLAfterwards, cancel protection to repair
Just.As can be seen that T in formula1Deviate desired value T0If bigger, adjustment amplitude is bigger.
Other than protection mechanism, the setting of correction factor k also can steady EGR control valve fluctuation, reduce wave crest and wave
The value of paddy.
The present invention is that EGR check valve is made to avoid damaging when high temperature gas flow is swept away.If the unidirectional valve protection of EGR
The limit value upper limit is THGenerally below 20 DEG C of check valve heatproof or more, then exhaust gas temperature T after EGR is cooling1Higher than THWhen, via
Exhaust gas temperature sensor is fed back after EGR is cooling, and ECU is received after temperature signal according to the arteries and veins spectrogram (MAP) set, ECU output
Corrected EGR control valve set point correct coefficient k < 1, and corresponding operation instruction is issued to EGR execution unit, turn down EGR
The practical aperture of control valve, and SCR efficiency is improved, to guarantee engine emission.Gas temperature is lower than protection limit value after EGR is cooling
Lower limit TLLater, EGR valve gradually restores normal mode.
The high temperature impact of moment can be effectively relieved in the present invention, avoid EGR check valve by the destruction of high-temperature gas.
The present invention also provides a kind of guard method of EGR cooling gas check valve, method includes:
The EGR exhaust temperature of temperature sensor senses check valve output end discharge, and the EGR exhaust temperature of induction is transmitted
To ECU module；
ECU module obtains the EGR exhaust temperature value of temperature sensor senses, and by the EGR exhaust temperature value of induction and in advance
If threshold value is compared；
When EGR exhaust temperature exceeds threshold value, ECU module adjusts the aperture of EGR control valve, reduces exhaust pipe and arranges exhaust gas
Amount, after cooler for recycled exhaust gas handles exhaust gas, reaches the EGR exhaust temperature of temperature sensor senses in threshold range.
In method provided by the invention, method further include:
It is T that ECU module, which obtains preset unidirectional valve protection limit value ceiling temperature,H；Obtaining unidirectional valve protection limit value lower limit is
TL；
The EGR exhaust temperature value T that ECU module is obtained by temperature sensor0Lower than unidirectional valve protection limit value lower limit TLWhen,
ECU module control EGR control valve 5 is maintained in the first aperture threshold range；
As the EGR exhaust temperature value T that ECU module is obtained by temperature sensor0Higher than unidirectional valve protection limit value lower limit TL,
And it is lower than unidirectional valve protection limit value ceiling temperature THWhen, ECU module control EGR control valve is maintained at the second aperture threshold range
It is interior；
As the EGR exhaust temperature value T that ECU module is obtained by temperature sensor0Higher than unidirectional valve protection limit value upper limit temperature
Spend THWhen, ECU module control EGR control valve is maintained in third aperture threshold range；
First aperture threshold range is greater than the second aperture threshold range, and the second aperture threshold range is greater than third aperture threshold value
Range.
Method further include:
Configuration protection correction factor k；
Protection correction factor k is formula: k=T0/T1* α or k=T0/T1+ α or k=T0/T1-α；
T0It is the desired value of engine exhaust gas temperature after EGR cooling under each operating condition；
T1It is exhaust gas temperature actual value after the EGR of ECU module acquisition is cooling；
Side reaction coefficient is a preset constant；The value of k is less than 1；
Work as T1Higher than THWhen, it is modified using aperture of the correction factor k to EGR control valve, the temperature after making EGR control valve
Spend T1It approaches and is lower than protection limitation lower limit TL；Temperature is lower than protection limitation lower limit T after EGR control valveLAfterwards, cancel protection to repair
Just.
The present invention also provides a kind of vehicles with EGR gas unidirectional valve protection, comprising: the protection of EGR cooling gas check valve
System.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (8)
1. a kind of protection system of EGR cooling gas check valve characterized by comprising ECU module (1), cooler for recycled exhaust gas (2), hair
Motivation (3), exhaust pipe (4), EGR control valve (5), check valve (6) and temperature sensor (7)；
Engine (3), exhaust pipe (4), EGR control valve (5), cooler for recycled exhaust gas (2), check valve (6) are sequentially connected；
Output end of the temperature sensor (7) close to check valve (6) is arranged；
Temperature sensor (7) and EGR control valve (5) are electrically connected with ECU module (1) respectively；
Temperature sensor (7) is used to incude the EGR exhaust temperature of check valve (6) output end discharge；
ECU module (1) is used to obtain the EGR exhaust temperature value of temperature sensor (7) induction, and by the EGR exhaust temperature of induction
Value is compared with preset threshold, and when EGR exhaust temperature exceeds threshold value, ECU module (1) adjustment EGR control valve (5) is opened
Degree, the EGR exhaust temperature for incuding temperature sensor (7) reach in threshold range.
2. the protection system of EGR cooling gas check valve according to claim 1, which is characterized in that
ECU module (1) is T for obtaining preset unidirectional valve protection limit value ceiling temperatureH；Obtain unidirectional valve protection limit value lower limit
For TL；
It is also used to ECU module (1) and passes through the EGR exhaust temperature value T that temperature sensor (7) obtain0Lower than under unidirectional valve protection limit value
Limit TLWhen, ECU module (1) control EGR control valve (5) is maintained in the first aperture threshold range；
When ECU module (1) passes through the EGR exhaust temperature value T that temperature sensor (7) obtain0Higher than unidirectional valve protection limit value lower limit
TL, and it is lower than unidirectional valve protection limit value ceiling temperature THWhen, ECU module (1) control EGR control valve (5) is maintained at the second aperture threshold
It is worth in range；
When ECU module (1) passes through the EGR exhaust temperature value T that temperature sensor (7) obtain0Higher than unidirectional valve protection limit value upper limit temperature
Spend THWhen, ECU module (1) control EGR control valve (5) is maintained in third aperture threshold range.
3. the protection system of EGR cooling gas check valve according to claim 2, which is characterized in that
ECU module (1) is also used to configure protection correction factor k；
Protection correction factor k is formula: k=T0/T1* α or k=T0/T1+ α or k=T0/T1-α；
T0It is the desired value of engine exhaust gas temperature after EGR cooling under each operating condition；
T1It is exhaust gas temperature actual value after the EGR of ECU module (1) acquisition is cooling；
Side reaction coefficient is a preset constant；The value of k is less than 1；
Work as T1Higher than THWhen, it is modified using aperture of the correction factor k to EGR control valve, the temperature T after making EGR control valve1
It approaches and is lower than protection limitation lower limit TL；Temperature is lower than protection limitation lower limit T after EGR control valveLAfterwards, cancel protection amendment.
4. the protection system of EGR cooling gas check valve according to claim 1, which is characterized in that the valve block of check valve is steel
Material, valve seat and valve deck are plastic part, and air-flow can only unidirectionally be opened from steel valve block to be passed through；Steel disc riveting is on valve seat, valve deck limit
The maximum opening of valve block processed can make valve block shed into air inlet pipeline when valve seat or valve deck are impaired.
5. a kind of guard method of EGR cooling gas check valve, which is characterized in that method includes:
The EGR exhaust temperature of temperature sensor senses check valve output end discharge, and the EGR exhaust temperature of induction is transmitted to
ECU module；
ECU module obtains the EGR exhaust temperature value of temperature sensor senses, and by the EGR exhaust temperature value of induction and default threshold
Value is compared；
When EGR exhaust temperature exceeds threshold value, ECU module adjusts the aperture of EGR control valve, reduces exhaust pipe to exhaust gas discharge capacity,
After cooler for recycled exhaust gas handles exhaust gas, reach the EGR exhaust temperature of temperature sensor senses in threshold range.
6. according to claim 5, the guard method of EGR cooling gas check valve, which is characterized in that method further include:
It is T that ECU module, which obtains preset unidirectional valve protection limit value ceiling temperature,H；Obtaining unidirectional valve protection limit value lower limit is TL；
The EGR exhaust temperature value T that ECU module is obtained by temperature sensor0Lower than unidirectional valve protection limit value lower limit TLWhen, ECU mould
Block control EGR control valve (5) is maintained in the first aperture threshold range；
As the EGR exhaust temperature value T that ECU module is obtained by temperature sensor0Higher than unidirectional valve protection limit value lower limit TL, and it is low
In unidirectional valve protection limit value ceiling temperature THWhen, ECU module control EGR control valve is maintained in the second aperture threshold range；
As the EGR exhaust temperature value T that ECU module is obtained by temperature sensor0Higher than unidirectional valve protection limit value ceiling temperature TH
When, ECU module control EGR control valve is maintained in third aperture threshold range；
First aperture threshold range is greater than the second aperture threshold range, and the second aperture threshold range is greater than third aperture threshold value model
It encloses.
7. according to claim 6, the guard method of EGR cooling gas check valve, which is characterized in that method further include:
Configuration protection correction factor k；
Protection correction factor k is formula: k=T0/T1* α or k=T0/T1+ α or k=T0/T1-α；
T0It is the desired value of engine exhaust gas temperature after EGR cooling under each operating condition；
T1It is exhaust gas temperature actual value after the EGR of ECU module acquisition is cooling；
Side reaction coefficient is a preset constant；The value of k is less than 1；
Work as T1Higher than THWhen, it is modified using aperture of the correction factor k to EGR control valve, the temperature T after making EGR control valve1
It approaches and is lower than protection limitation lower limit TL；Temperature is lower than protection limitation lower limit T after EGR control valveLAfterwards, cancel protection amendment.
8. a kind of vehicle with EGR gas unidirectional valve protection characterized by comprising as described in Claims 1-4 is any
EGR cooling gas check valve protection system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811533231.3A CN109372660B (en) | 2018-12-14 | 2018-12-14 | Protection system and method for EGR gas one-way valve and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811533231.3A CN109372660B (en) | 2018-12-14 | 2018-12-14 | Protection system and method for EGR gas one-way valve and vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109372660A true CN109372660A (en) | 2019-02-22 |
| CN109372660B CN109372660B (en) | 2022-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811533231.3A Active CN109372660B (en) | 2018-12-14 | 2018-12-14 | Protection system and method for EGR gas one-way valve and vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113958417A (en) * | 2021-10-21 | 2022-01-21 | 中国重汽集团济南动力有限公司 | EGR (exhaust gas recirculation) one-way valve high-temperature protection control method and device and storage medium |
| CN116085125A (en) * | 2023-02-15 | 2023-05-09 | 广州汽车集团股份有限公司 | Control method and device for exhaust gas recirculation valve, vehicle and storage medium |
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| CN113958417A (en) * | 2021-10-21 | 2022-01-21 | 中国重汽集团济南动力有限公司 | EGR (exhaust gas recirculation) one-way valve high-temperature protection control method and device and storage medium |
| CN113958417B (en) * | 2021-10-21 | 2024-01-23 | 中国重汽集团济南动力有限公司 | High-temperature protection control method and device for EGR check valve and storage medium |
| CN116085125A (en) * | 2023-02-15 | 2023-05-09 | 广州汽车集团股份有限公司 | Control method and device for exhaust gas recirculation valve, vehicle and storage medium |
| CN116085125B (en) * | 2023-02-15 | 2024-03-26 | 广州汽车集团股份有限公司 | Control method and device for exhaust gas recirculation valve, vehicle and storage medium |
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| CN109372660B (en) | 2022-04-01 |
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