CN114076041A - Control method and control system of EGR valve - Google Patents
Control method and control system of EGR valve Download PDFInfo
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- CN114076041A CN114076041A CN202010833139.XA CN202010833139A CN114076041A CN 114076041 A CN114076041 A CN 114076041A CN 202010833139 A CN202010833139 A CN 202010833139A CN 114076041 A CN114076041 A CN 114076041A
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- 238000003745 diagnosis Methods 0.000 claims abstract description 22
- 238000003860 storage Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000004590 computer program Methods 0.000 claims description 2
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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
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
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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
- F02M26/52—Systems for actuating EGR valves
- F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
- F02M26/54—Rotary actuators, e.g. step motors
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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
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
- F02D2021/083—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine controlling exhaust gas recirculation electronically
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Abstract
The invention discloses a control method and a control system of an EGR valve, wherein the control method comprises the following steps: acquiring a target voltage according to the target opening degree of the EGR valve; acquiring the ambient temperature and the water temperature of an engine after acquiring the target voltage; controlling the EGR valve to selectively work according to the ambient temperature and/or the temperature of the engine water; controlling an on-board diagnostics system to selectively monitor the EGR valve based on the ambient temperature and/or the engine water temperature. According to the control method of the EGR valve, when the EGR valve is used, the ambient temperature and the water temperature of an engine are detected firstly, so that the EGR valve is ensured to be in an environment state capable of being normally used when being opened, the problem that the valve rod is frozen to cause intermittent faults when the EGR valve is used is further avoided, the situation that the EGR valve is mistakenly detected by a vehicle-mounted diagnosis system and gives an alarm when the environmental conditions of the EGR valve are not met is avoided, the situation that the vehicle-mounted diagnosis system is mistakenly diagnosed is prevented, and the trouble of false alarm to a client is eliminated.
Description
Technical Field
The invention relates to the technical field of vehicle manufacturing, in particular to a control method of an EGR valve and a control system of the EGR valve suitable for the control method.
Background
Exhaust Gas Recirculation (EGR), one of the effective technologies for reducing emissions, is widely used not only in the field of diesel engines but also in the field of gasoline engines in the sixth phase of the world. The direct current motor EGR valve that matches in the existing market mainly is step motor lift valve, and its control principle is: and determining the target voltage of the EGR valve according to the lift requirement of the EGR valve, comparing the actually measured feedback voltage of the EGR valve of the direct current motor with the target voltage, and then performing PID control according to the difference value to enable the actual voltage to reach the target voltage value, thereby controlling the EGR rate. In the related art, the EGR valve is used in cold regions, particularly in extremely cold regions, faults often occur, so that a fault lamp of an instrument panel engine is always on, the fault lamp can disappear when the fault lamp is started again, the problem occurs repeatedly, and no fault can be detected in a maintenance station. Therefore, it is easy to cause trouble to customers, and there is room for improvement.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a control method for an EGR valve, which detects the ambient temperature and the engine water temperature when the EGR valve is used, so as to ensure that the EGR valve is in the normal environment state when being opened and detected by an on-board diagnosis system, reduce the occurrence of false alarm of an engine fault lamp on a vehicle instrument panel, and reduce the trouble suffered by customers.
According to an embodiment of the present invention, a control method of an EGR valve includes: acquiring a target voltage according to the target opening degree of the EGR valve; acquiring the ambient temperature and the water temperature of an engine after acquiring the target voltage; controlling the EGR valve to selectively work according to the ambient temperature and/or the temperature of the engine water; controlling an on-board diagnostics system to selectively monitor the EGR valve based on the ambient temperature and/or the engine water temperature.
According to the control method of the EGR valve, when the EGR valve is used, the ambient temperature and the water temperature of the engine are detected firstly, so that the EGR valve is ensured to be in an environment state capable of being normally used when being opened, the problem that the valve rod is frozen to cause intermittent faults when the EGR valve is used is further avoided, the situation that the EGR valve is mistakenly detected by a vehicle-mounted diagnosis system and gives an alarm when the environmental conditions of the EGR valve are not met is avoided, the situation that the vehicle-mounted diagnosis system is mistakenly diagnosed is prevented, and the trouble of false alarm to a client is eliminated.
According to the control method of the EGR valve of the embodiment of the present invention, the controlling of the EGR valve to be selectively operated according to the ambient temperature and/or the engine water temperature includes: when the environment temperature is not less than a first set temperature value or the engine water temperature is not less than a second set temperature value, controlling the EGR valve to work; and when the environment temperature is less than a first set temperature value and the water temperature of the engine is less than a second set temperature value, controlling the EGR valve to work and not work.
According to the control method of the EGR valve of the embodiment of the present invention, the first set temperature value is t1, and the second set temperature value is t2, and it satisfies the following conditions: t1 is more than or equal to minus 9 ℃ and less than or equal to minus 7 ℃, and t2 is more than or equal to 19 ℃ and less than or equal to 21 ℃.
According to the control method of the EGR valve, after the EGR valve works, the actual voltage fed back by the EGR valve is obtained; and selecting a control program of the driving device of the EGR valve according to the difference value of the target voltage and the actual voltage.
According to the control method of the EGR valve of the embodiment of the present invention, the driving apparatus of the EGR valve includes a direct current motor, and the controlling the driving apparatus of the EGR valve according to the difference between the target voltage and the actual voltage includes: selecting a direct current motor forward operation control program when the difference value between the target voltage and the actual voltage is a positive value; and selecting a reverse operation control program of the direct current motor when the difference value between the target voltage and the actual voltage is a negative value.
According to the control method of the EGR valve of the embodiment of the present invention, the control method further includes: and when the difference value between the target voltage and the actual voltage is zero, controlling the valve rod of the EGR valve to be kept still.
According to the control method of the EGR valve, when the environment temperature is not less than a first set temperature value or the engine water temperature is not less than a second set temperature value, the vehicle-mounted diagnosis system is controlled to monitor the EGR valve; and when the ambient temperature is lower than a first set temperature value and the water temperature of the engine is lower than a second set temperature value, controlling the vehicle-mounted diagnosis system to not monitor the EGR valve.
According to the control method of the EGR valve, after the EGR valve is monitored, the EGR valve is selected to be continuously monitored or controlled to be powered off according to the working state of the EGR valve.
The invention also provides a control system of the EGR valve.
According to an embodiment of the present invention, a control system of an EGR valve, which is applied to a control method of the EGR valve described in any one of the above, includes: an acquisition module for acquiring the target voltage and acquiring the ambient temperature and the engine water temperature; a control module to control the EGR valve to selectively operate based on the ambient temperature and/or the engine water temperature.
The invention also provides a computer readable storage medium.
A computer-readable storage medium according to an embodiment of the invention, has a computer program stored thereon, which, when executed by a processor, implements a method of controlling an EGR valve as described in any of the embodiments above.
The advantages of the control system, the computer readable storage medium and the control method of the EGR valve described above with respect to the prior art are the same and will not be described herein again.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic flow chart diagram of a control method according to an embodiment of the invention;
FIG. 2 is a flow chart illustrating a control method according to an embodiment of the present invention in a specific implementation;
FIG. 3 is a flow chart illustrating a control method according to an embodiment of the present invention in a specific implementation;
FIG. 4 is a flow chart illustrating a control method in a particular implementation according to an embodiment of the present invention;
FIG. 5 is a control schematic of a control method according to an embodiment of the invention;
fig. 6 is a control schematic diagram of an on-board diagnostic system for EGR valve according to the control method of the embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
The control method of the EGR valve according to the embodiment of the invention is described below with reference to FIGS. 1-2, and the control method detects the ambient temperature and the engine water temperature when the EGR valve is used so as to ensure that the EGR valve is in the normal environment state when being opened, thereby reducing the occurrence of false alarm of an engine fault lamp on a vehicle instrument panel and reducing the trouble suffered by a customer.
As shown in fig. 1, a control method of an EGR valve according to an embodiment of the present invention includes:
s10: the target voltage U1 is obtained from the target opening degree of the EGR valve.
It should be noted that the EGR valve in the present invention may be a dc motor controlled valve, and specifically, the valve rod may be driven by a stepping motor to move, so as to realize the adjustment of the opening degree of the EGR valve. That is, when the EGR valve opening control is performed, it is necessary to determine a lift requirement of the valve rod according to the target opening degree of the EGR valve to determine the target voltage U1 of the EGR valve, so as to control the stepping motor according to the target voltage U1, thereby realizing the movement of the valve rod and the opening process of the EGR valve. In other words, the EGR valve is ready to be driven after the target voltage U1 of the EGR valve is acquired.
S20: and acquiring the ambient temperature and the engine water temperature after acquiring the target voltage U1.
That is, after it is determined that preparation for driving the EGR valve to open is made, it is determined whether the EGR valve is in a state capable of normal operation, that is, it is ensured that the environmental factors of the EGR valve satisfy the normal operation conditions of the EGR valve. Among them, the ambient temperature and the water temperature of the engine are prerequisites affecting the normal operation of the EGR valve. It can be understood that in cold regions in winter, particularly in extremely cold regions, when the ambient temperature is extremely low or the water temperature of the engine is too low, the valve rod inside the EGR valve is very easy to freeze, so that the EGR valve cannot be normally used.
S30: and controlling the EGR valve to selectively work according to the ambient temperature and/or the temperature of the water in the engine.
That is, the ambient temperature and the engine water temperature are used as control references in controlling the EGR valve. That is, when the cooling system of the engine is controlled by the control method of the present invention, the opening of the EGR valve is not under any condition, but can be started after meeting the environment capable of normal operation, otherwise the EGR valve cannot be opened. Namely, when the ambient temperature of the EGR valve and/or the water temperature of the engine meet the running conditions of the EGR valve, the EGR valve can be opened and normally run. In other words, the EGR valve may be opened when the ambient temperature and the water temperature of the engine satisfy the opening condition of the EGR valve at the same time, or when the ambient temperature and the water temperature of the engine satisfy the opening condition of the EGR valve alone.
It can be understood that when the environmental temperature is low and the water temperature of the engine is in the range capable of meeting the operation of the EGR valve, the water of the engine flows to the EGR valve to heat the EGR valve, so that the valve rod inside the EGR valve can be still prevented from being frozen, and the EGR valve is ensured to be in a safe operation state; or when the water temperature of the engine is lower, and when the environment temperature is in the interval capable of meeting the running condition of the EGR valve, the air flow in the environment can influence the temperature of the EGR valve to avoid the valve rod inside the EGR valve from being frozen, so that the EGR valve is ensured to be in a safe running state, and when the environment temperature and the water temperature of the engine meet the normal running condition of the EGR valve, the safe opening of the EGR valve is facilitated. Therefore, after the conditions of the ambient temperature or the water temperature of the engine are met, the control end can activate the stepping motor to drive and control the EGR valve according to the target voltage U1, so that the EGR valve is opened and operated, and the problem of intermittent faults is avoided.
S40: after the EGR valve is operated, the actual voltage U2 fed back by the EGR valve is obtained. The control program of the driving apparatus of the EGR valve is selected according to the difference between the target voltage U1 and the actual voltage U2. In order to ensure that the actual opening degree of the EGR valve is the same as the target opening degree, the EGR valve is required to be adjusted through voltage feedback, the voltage is fed back by continuously monitoring the opening degree, the device is driven to work, and the EGR valve is ensured to be in the optimal state as far as possible.
S50: an on-board diagnostics (OBD) system is controlled to selectively monitor the EGR valve based on ambient temperature or engine water temperature. Whether the vehicle-mounted diagnosis system needs to monitor the EGR valve or not is judged by detecting the ambient temperature and the water temperature of the engine, the condition that the vehicle-mounted diagnosis system mistakenly detects the fault of the EGR valve and gives an alarm due to the fact that the EGR valve is not normally opened when the ambient conditions are not met is avoided, the condition that the vehicle-mounted diagnosis system mistakenly diagnoses is prevented, and the trouble which a client may receive is greatly eliminated
According to the control method of the EGR valve, when the EGR valve is used, the ambient temperature and the water temperature of the engine are detected firstly, so that the EGR valve is ensured to be in an environment state capable of being normally used when being opened, the problem that the valve rod is frozen to cause intermittent faults when the EGR valve is used is further avoided, the situation that the EGR valve is mistakenly detected by a vehicle-mounted diagnosis system and gives an alarm when the environmental conditions of the EGR valve are not met is avoided, the situation that the vehicle-mounted diagnosis system is mistakenly diagnosed is prevented, and the trouble of false alarm to a client is eliminated.
In some embodiments, step S30: controlling the EGR valve to selectively operate based on the ambient temperature and/or the engine water temperature includes:
s31: and when the ambient temperature is not less than the first set temperature value or the water temperature of the engine is not less than the second set temperature value, controlling the EGR valve to work. That is, the EGR valve can be controlled to operate when the ambient temperature of the EGR valve is not less than the first set temperature value, or the engine water temperature is not less than the second set temperature value, and of course, the EGR valve can also be controlled to operate when the ambient temperature of the EGR valve is not less than the first set temperature value and the engine water temperature is not less than the second set temperature value. Therefore, the problem that the valve rod inside the EGR valve is frozen after the EGR valve is opened can be avoided under the above conditions, and the normal use of the EGR valve is ensured. The first set temperature value and the second set temperature value can be flexibly set according to actual requirements.
Wherein, first settlement temperature value is less than the second settlement temperature value, ambient temperature's minimum is less than the second settlement temperature value in the condition of EGR valve normal operating promptly, it can be understood that ambient temperature is the outside temperature of EGR valve, ambient temperature just can cause the valve rod to freeze to the valve rod that the valve body transmission of EGR valve is the outside cold volume to the EGR valve inside, and the water of engine can directly flow to the valve body of EGR valve in direct action valve rod, consequently, harsher in the second settlement temperature value when setting for first settlement temperature value, make first settlement temperature value set for being less than the second and set for the temperature value and do benefit to guaranteeing more accurately that the EGR valve opens in normal operating environment, thereby avoid the condition that the inside valve rod freezes to appear in the EGR valve, improve the reliability to EGR valve control.
S32: and when the ambient temperature is lower than the first set temperature value and the water temperature of the engine is lower than the second set temperature value, controlling the EGR valve to work and not work. When the ambient temperature and the water temperature of the engine do not meet the condition that the EGR valve is opened, the EGR valve is controlled to be in a closed state, and therefore the condition that the valve rod of the EGR valve is frozen after the EGR valve is opened is prevented.
In some embodiments, the first set temperature value is t1 and the second set temperature value is t2, satisfying: t1 ≦ 7 ≦ t2 ≦ 21 ℃, t1 may be set to-8.5 ℃, t2 to 19.5 ℃, or t1 may be set to-8 ℃, t2 to 20 ℃, as shown in fig. 1, or t1 may be set to-7.5 ℃, t2 to 20.5 ℃. Therefore, the set temperature value is set in the two intervals, on one hand, false alarm of an engine fault lamp caused by the fact that the temperature of the EGR valve is too low and the EGR valve cannot be started normally is avoided, and on the other hand, if the set temperature value is too high, the EGR valve cannot be started frequently due to too high standards in winter in severe cold areas, and the use of a vehicle is affected.
In some embodiments, the driving apparatus of the EGR valve includes a direct current motor, and the step S40: controlling the driving apparatus of the EGR valve according to the difference between the target voltage U1 and the actual voltage U2 includes:
s41: and selecting a direct current motor forward operation control program when the difference value between the target voltage U1 and the actual voltage U2 is a positive value. That is to say, the actual voltage U2 obtained by currently controlling the operation of the EGR valve does not reach the target voltage U1 and is less than the target voltage U1, that is, the opening degree of the EGR valve needs to be controlled to be increased, so that a direct current motor forward operation control program is selected to drive the EGR valve to be further opened by forward operation of the direct current motor, so that the actual voltage U2 is increased and reaches the target voltage U1, and it is ensured that the actually output current is consistent with the target current.
S42: and selecting a reverse operation control program of the direct current motor when the difference value between the target voltage U1 and the actual voltage U2 is a negative value. That is to say, the actual voltage U2 obtained by currently controlling the operation of the EGR valve reaches the target voltage U1 and is greater than the target voltage U1, that is, the opening degree of the EGR valve needs to be controlled to be reduced, so that a direct-current motor reverse operation control program is selected, the direct-current motor reverse operation drives the EGR valve to be reversely reduced, the actual voltage U2 is reduced and reaches the target voltage U1, and it is ensured that the actually output current is consistent with the target current.
Of course, step S40: may also include S43: when the difference between the target voltage U1 and the actual voltage U2 is zero, the actual voltage U2 is consistent with the target voltage U1, the operation control program of the direct current motor does not need to be selected, and the EGR valve is kept still.
In some specific implementations: s50: selectively monitoring the EGR valve according to an ambient temperature or an engine water temperature control on-board diagnostics (OBD) includes:
s51: when the ambient temperature is not less than the first set temperature value or the engine water temperature is not less than the second set temperature value, the vehicle-mounted diagnosis system is controlled to monitor the EGR valve, when the detected temperature is higher than the first set temperature value or the second set temperature value, the EGR valve starts to work, the EGR valve is in a normal running state at the moment, timely early warning prompt can be guaranteed when the EGR valve breaks down by monitoring the vehicle-mounted diagnosis system, a user can find out that the EGR valve breaks down timely, and the maintenance and the replacement are performed timely.
S52: and when the ambient temperature is lower than the first set temperature value and the water temperature of the engine is lower than the second set temperature value, controlling the vehicle-mounted diagnosis system not to monitor the EGR valve. That is to say, under this condition, the EGR valve is limited by the temperature condition and is not opened normally, and the EGR valve can't work effectively but is not out of order, and control on-vehicle diagnostic system does not detect the EGR valve this moment, can avoid reporting the trouble that the mistake causes the customer frequently. And when the vehicle gradually runs and the water temperature of the engine rises, the EGR valve can effectively work, and the vehicle-mounted diagnosis system can be controlled to monitor the EGR valve.
S53: after the EGR valve is monitored, the EGR valve is selected to be continuously monitored or controlled to be powered off according to the working state of the EGR valve. That is, after the EGR valve is determined to be in a temperature condition capable of running, the working condition of the EGR valve is monitored through the vehicle-mounted diagnosis system, and at the moment, if the EGR valve is detected to work normally, the EGR valve is detected so as to avoid the situation of subsequent faults and avoid the over-limit work or the non-work of the EGR valve; if the EGR valve is detected to be out of order, namely the EGR valve is in the abnormal working condition, the power is cut off, and the fault is declared on an instrument panel of the vehicle, so that a user can repair and replace the EGR valve in time.
The invention also provides a control system of the EGR valve.
According to the control system of the EGR valve of the embodiment of the present invention, the control system is applied to the control method of the EGR valve of any one of the above, and the control system includes: the device comprises an acquisition module and a control module. The obtaining module is used for obtaining the target voltage U1 and obtaining the ambient temperature and the engine water temperature, and if the obtaining module comprises a temperature sensor and a water temperature sensor, the temperature sensor is used for detecting the ambient temperature of the EGR valve, and the water temperature sensor is used for detecting the water temperature of the engine.
The control module is used for controlling the EGR valve to selectively work according to the ambient temperature and/or the water temperature of the engine and executing other control steps in the control method.
The specific applications of the obtaining module and the control module are the same as those of the control method, and are not described herein again. Therefore, by detecting the ambient temperature and the water temperature of the engine through the control system, when the ambient temperature and the water temperature of the engine are lower than the requirements, the EGR valve does not work, the problem that the EGR valve cannot reach the required opening degree due to the fact that the valve rod is frozen is avoided, and the probability that the engine fault lamp is turned on due to the fact that the EGR valve is used in a cold region is reduced. And the vehicle-mounted diagnosis system does not monitor the EGR system under the condition, so that the condition that the vehicle-mounted diagnosis system mistakenly detects the fault of the EGR valve and gives an alarm due to the fact that the EGR valve is not normally opened when the environmental condition is not met is avoided, the condition that the vehicle-mounted diagnosis system mistakenly diagnoses is prevented, the condition that the EGR fault is detected and the alarm is given, and the trouble which a client possibly receives is greatly eliminated.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A control method of an EGR valve, characterized by comprising:
acquiring a target voltage according to the target opening degree of the EGR valve;
acquiring the ambient temperature and the water temperature of an engine after acquiring the target voltage;
controlling the EGR valve to selectively work according to the ambient temperature and/or the temperature of the engine water;
controlling an on-board diagnostics system to selectively monitor the EGR valve based on the ambient temperature and/or the engine water temperature.
2. The control method of the EGR valve according to claim 1, wherein the controlling the EGR valve to selectively operate according to the ambient temperature and/or the engine water temperature includes:
when the environment temperature is not less than a first set temperature value or the engine water temperature is not less than a second set temperature value, controlling the EGR valve to work;
and when the environment temperature is less than a first set temperature value and the water temperature of the engine is less than a second set temperature value, controlling the EGR valve to work and not work.
3. The control method of the EGR valve according to claim 2, wherein the first set temperature value is t1, and the second set temperature value is t2, and satisfies: t1 is more than or equal to minus 9 ℃ and less than or equal to minus 7 ℃, and t2 is more than or equal to 19 ℃ and less than or equal to 21 ℃.
4. The control method of the EGR valve according to claim 2, wherein after the EGR valve is operated, an actual voltage fed back by the EGR valve is obtained;
and selecting a control program of the driving device of the EGR valve according to the difference value of the target voltage and the actual voltage.
5. The control method of the EGR valve according to claim 2, wherein the driving apparatus of the EGR valve includes a direct current motor, and the controlling the driving apparatus of the EGR valve according to the difference between the target voltage and the actual voltage includes:
selecting a direct current motor forward operation control program when the difference value between the target voltage and the actual voltage is a positive value;
and selecting a reverse operation control program of the direct current motor when the difference value between the target voltage and the actual voltage is a negative value.
6. The control method of the EGR valve according to claim 5, characterized by further comprising:
and when the difference value between the target voltage and the actual voltage is zero, controlling the valve rod of the EGR valve to be kept still.
7. The control method of the EGR valve according to claim 1, characterized in that,
when the ambient temperature is not less than a first set temperature value or the engine water temperature is not less than a second set temperature value, controlling the vehicle-mounted diagnosis system to monitor the EGR valve;
and when the ambient temperature is lower than a first set temperature value and the water temperature of the engine is lower than a second set temperature value, controlling the vehicle-mounted diagnosis system to not monitor the EGR valve.
8. The method for controlling the EGR valve according to claim 7, wherein after monitoring the EGR valve, the EGR valve is selected to continue to be monitored or to be de-energized according to an operating state of the EGR valve.
9. A control system for an EGR valve, characterized in that the control system is adapted to a control method for an EGR valve according to any of claims 1-8, and the control system comprises:
an acquisition module for acquiring the target voltage and acquiring the ambient temperature and the engine water temperature;
a control module to control the EGR valve to selectively operate based on the ambient temperature and/or the engine water temperature.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a method for controlling an EGR valve according to any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010833139.XA CN114076041A (en) | 2020-08-18 | 2020-08-18 | Control method and control system of EGR valve |
Applications Claiming Priority (1)
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| CN114876679A (en) * | 2022-04-19 | 2022-08-09 | 江铃汽车股份有限公司 | EGR valve protection strategy test system and method |
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