CN115324760B - Valve clamping stagnation treatment system - Google Patents
Valve clamping stagnation treatment system Download PDFInfo
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- CN115324760B CN115324760B CN202211261254.XA CN202211261254A CN115324760B CN 115324760 B CN115324760 B CN 115324760B CN 202211261254 A CN202211261254 A CN 202211261254A CN 115324760 B CN115324760 B CN 115324760B
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- valve
- gas recirculation
- recirculation system
- opening
- exhaust gas
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
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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
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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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]
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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
- Y02T10/40—Engine management systems
Abstract
The application discloses processing system of valve jamming includes: a position sensor and an electronic control unit; the electronic sensor is used for acquiring the current actual opening of the valve of the exhaust gas recirculation system in real time; the electronic control unit is used for acquiring the current target opening of the exhaust gas recirculation system valve and the current actual opening acquired by the position sensor in real time; judging whether the valve has a clamping stagnation fault or not based on the current actual opening and the current target opening; if the jamming fault exists, cutting off fuel supply of an engine of the target vehicle, and controlling the engine to enter a reverse dragging mode; controlling the valve to open to a target opening degree to blow the airflow through the valve; after a preset time period, closing the valve; sending an instruction for opening the target detection opening degree to the valve, and acquiring the actual detection opening degree of the valve; judging whether the clamping stagnation fault is repaired or not based on the target detection opening and the actual detection opening; and if the clamping stagnation fault is judged to be repaired, the normal operation of the engine is recovered.
Description
Technical Field
The application relates to the technical field of vehicle fault processing, in particular to a valve clamping stagnation processing system.
Background
For engines with Exhaust Gas Recirculation (EGR), an EGR valve is a very important component because its opening controls the flow of Exhaust Gas into the Exhaust pipe of the engine, affecting the combustion of fuel in the engine.
In the actual use process of vehicle, foreign matters may fall off in the pipeline in front of the exhaust gas recirculation system valve, for example, fin fragments in the cooler of the exhaust gas recirculation system, sticky sand on the inner surface of a casting, metal processing fragments and the like, and when the foreign matters pass through the exhaust gas recirculation system valve, the foreign matters may be clamped between the valve of the exhaust gas recirculation system valve and the valve body, so that the opening of the exhaust gas recirculation system valve cannot be accurately opened to the target opening of a control instruction sent by an ECU (electronic control Unit), and therefore the gas flow entering the engine cannot meet the requirement, further, insufficient fuel combustion may be caused, and the power of the engine is insufficient. When the stagnation is serious, the engine can not be ignited normally, or unburned fuel enters an after-treatment system, such as a three-way catalyst, and burns in the after-treatment system, so that the damage to the components in the after-treatment system can be caused.
Current vehicle valve control systems monitor the egr valve and when it is detected that the egr valve is stuck, the engine torque is directly limited. After a driver drives a vehicle to a maintenance station to repair the clamping failure of the exhaust gas recirculation system valve, the limitation on the torque of the engine is cancelled, and the normal running of the vehicle is recovered. Obviously, the engine and the aftertreatment system are protected to a certain extent only by the conventional system, but the problem of valve clamping stagnation of the exhaust gas recirculation system cannot be eliminated in time, so that the normal running of the vehicle can be influenced for a long time when the vehicle cannot be maintained in time at a maintenance station.
Disclosure of Invention
Based on the not enough of above-mentioned prior art, the application provides a processing system of valve jamming to solve current valve control system and can lead to the problem that the vehicle can't normally travel for a long time.
In order to achieve the above object, the present application provides the following technical solutions:
the present application provides in a first aspect a valve stuck treatment system comprising:
a position sensor and an electronic control unit;
the position sensor is used for acquiring the current actual opening of the exhaust gas recirculation system valve of the target vehicle in real time;
the electronic control unit is used for determining the current target opening degree of the exhaust gas recirculation system valve of the target vehicle in real time and receiving the current actual opening degree of the exhaust gas recirculation system valve of the target vehicle acquired by the position sensor;
determining whether a sticking fault exists in the exhaust gas recirculation system valve based on the current actual opening and the current target opening of the exhaust gas recirculation system valve;
if the exhaust gas recirculation system valve is judged to have the clamping stagnation fault, cutting off fuel supply of an engine of the target vehicle, and controlling the engine to enter a reverse dragging mode;
controlling the exhaust gas recirculation system valve to open to a target opening to blow a gas flow through the exhaust gas recirculation system valve;
after a preset length of time, closing the exhaust gas recirculation system valve;
sending an instruction for opening a target detection opening degree to the exhaust gas recirculation system valve, and acquiring an actual detection opening degree of the exhaust gas recirculation system valve;
determining whether a stuck fault of the EGR valve has been repaired based on the target detected opening and the actual detected opening of the EGR valve;
and if the clamping stagnation fault of the exhaust gas recirculation system valve is repaired, recovering the normal operation of the engine.
Optionally, in the above valve stuck processing system, when the electronic control unit executes the determining whether the exhaust gas recirculation system valve has the stuck fault based on the current actual opening and the current target opening of the exhaust gas recirculation system valve, the electronic control unit is configured to:
judging whether the absolute value of the difference value between the current actual opening and the current target opening of the exhaust gas recirculation system valve is larger than a preset threshold value or not;
if the absolute value of the difference value between the current actual opening and the current target opening of the exhaust gas recirculation system valve is judged to be larger than a preset threshold value, determining that the exhaust gas recirculation system valve has a clamping stagnation fault;
and if the absolute value of the difference value between the current actual opening and the current target opening of the exhaust gas recirculation system valve is judged to be not larger than a preset threshold value, determining that the exhaust gas recirculation system valve has no clamping stagnation fault.
Optionally, in the above valve stuck processing system, the target opening is a maximum opening, and the electronic control unit executes the control to open the exhaust gas recirculation system valve to the target opening, and is configured to:
and controlling the valve of the waste gas recirculation system to be opened to the maximum opening degree by sending an instruction of opening the maximum opening degree to the valve of the waste gas recirculation system.
Optionally, in the above valve stuck processing system, the electronic control unit is further configured to:
before the command of opening the target detection opening degree is sent to the exhaust gas recirculation system valve, whether the recorded times of repeatedly opening and closing the exhaust gas recirculation system valve are equal to preset times or not is judged; if the recorded times of repeated opening and closing of the waste gas recirculation system valve is equal to the preset times, executing the instruction of sending the opening target detection opening degree to the waste gas recirculation system valve;
and if the recorded times of repeatedly opening and closing the waste gas recirculation system valve are not equal to the preset times, adding one to the recorded times of repeatedly opening and closing the waste gas recirculation system valve, and returning to execute the control of opening the waste gas recirculation system valve to the target opening.
Optionally, in the above valve stuck processing system, the electronic control unit is further configured to:
feeding back target failure prompt information to a driver of the target vehicle before performing the fuel cut of an engine of the target vehicle and controlling the engine to enter a towing mode; the target fault prompting information is used for prompting that the clamping stagnation fault exists in the exhaust gas recirculation system valve at present, and the clamping stagnation fault is processed by entering a drag-down mode;
monitoring the current operation condition of the target vehicle in real time;
judging whether the current operation condition of the target vehicle meets a target safety condition; wherein the target safety condition refers to a condition for ensuring safety of the vehicle when fuel supply to an engine of the vehicle is cut off and the engine is controlled to enter a tow-back mode;
and if the current operation condition of the target vehicle is judged to meet the target safety condition, prompting a driver of the target vehicle to start the jamming fault treatment.
Optionally, in the above valve stuck processing system, the electronic control unit is further configured to:
feeding back a failure repair prompt message to a driver of the target vehicle after the restoration of the normal operation of the engine is performed; and the fault repairing prompt message is used for prompting that the clamping stagnation fault of the exhaust gas recirculation system valve is eliminated and the normal operation of the vehicle is recovered.
Optionally, in the above valve stuck processing system, the electronic control unit is further configured to:
if the clamping stagnation fault of the exhaust gas recirculation system valve is judged not to be repaired, feeding back target alarm prompt information; the target alarm prompt information is used for prompting that the clamping stagnation fault of the exhaust gas recirculation system valve is not automatically repaired and needs to be manually maintained.
Optionally, in the above valve stuck processing system, the electronic control unit is further configured to:
and if the clamping stagnation fault of the exhaust gas recirculation system valve is not repaired, recovering the fuel supply of the engine of the target vehicle, and controlling the engine to enter a torque limiting mode.
Optionally, in the above valve stuck processing system, the electronic control unit is further configured to:
finding out a target preset difference range in which the absolute value of the difference between the current actual opening and the current target opening of the exhaust gas recirculation system valve is located from each preset difference range;
setting the time length corresponding to the target preset difference range as the preset time length; the larger the limit value of the preset difference range is, the longer the corresponding time length is.
Optionally, in the above valve stuck processing system, the electronic control unit executes the restoration of the normal operation of the engine to:
resuming the fueling of the engine of the target vehicle and adjusting the target vehicle to a gear that matches the current vehicle speed of the target vehicle.
The application provides a processing system of valve jamming, includes position sensor and electronic control unit. The position sensor is used for acquiring the current actual opening degree of the exhaust gas recirculation system valve of the target vehicle. The electronic control unit is used for: the method comprises the steps of determining the current target opening of the exhaust gas recirculation system valve of a target vehicle in real time, and receiving the current actual opening of the exhaust gas recirculation system valve of the target vehicle acquired by a position sensor, so as to judge whether the exhaust gas recirculation system valve has a clamping stagnation fault or not based on the current actual opening and the current target opening of the exhaust gas recirculation system valve. If the clamping failure of the valve of the exhaust gas recirculation system is judged, fuel supply of an engine of a target vehicle is cut off, the engine is controlled to enter a dragging mode, the problems that fuel enters the post-processing system to be combusted, parts of the post-processing system are burnt and damaged and the like are avoided, and gas flows into the exhaust gas recirculation system are also guaranteed. And then, controlling the valve of the waste gas recirculation system to be opened to a target opening, blowing the air flow through the valve of the waste gas recirculation system, and closing the valve of the waste gas recirculation system after the air flow lasts for a preset time length, so that the air flow can be used for blowing out the foreign matters causing the clamping stagnation. And then sending an instruction for opening the target detection opening degree to the exhaust gas recirculation system valve, acquiring the actual detection opening degree of the exhaust gas recirculation system valve, and judging whether the clamping failure of the exhaust gas recirculation system valve is repaired or not based on the target detection opening degree and the actual detection opening degree of the exhaust gas recirculation system valve. And if the clamping stagnation fault of the repaired exhaust gas recirculation system valve is judged, the normal operation of the engine is recovered. Therefore, when the clamping stagnation fault of the valve of the exhaust gas recirculation system is monitored, the problems that fuel enters the post-processing system to be combusted, parts of the post-processing system are burnt and damaged and the like can be effectively avoided, the clamping stagnation fault can be automatically and timely eliminated, and normal running of a vehicle can be quickly recovered.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a valve stuck processing system according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a method for processing valve sticking implemented by an electronic control unit according to an embodiment of the present application;
FIG. 3 is a flowchart of a method implemented by an electronic control unit for determining whether a stuck fault exists in a valve of an exhaust gas recirculation system according to an embodiment of the present disclosure;
FIG. 4 is a flowchart of a method for processing safety assurance of a target vehicle implemented by an electronic control unit according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an electronic control unit according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In this application, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
An embodiment of the present application provides a valve sticking processing system, as shown in fig. 1, including:
a position sensor, and an Electronic Control Unit (ECU).
And the position sensor is used for acquiring the current actual opening degree of the exhaust gas recirculation system valve of the target vehicle in real time.
And the electronic control unit is used for realizing a method for treating valve clamping stagnation based on the actual opening of the valve of the exhaust gas recirculation system acquired by the position sensor. As shown in fig. 2, the method for processing the valve sticking implemented by the electronic control unit specifically includes the following steps:
s201, determining the current target opening of the exhaust gas recirculation system valve of the target vehicle in real time, and receiving the current actual opening of the exhaust gas recirculation system valve of the target vehicle, which is acquired by the position sensor.
It should be noted that, in the running process of the target vehicle, the electronic control unit may determine, according to the current operating condition, the opening of the exhaust gas recirculation system valve that needs to be opened currently, that is, determine the current target opening of the exhaust gas recirculation system valve, and then send an instruction for opening the current target opening to the exhaust gas recirculation system valve, so as to control the opening of the exhaust gas recirculation system valve to adjust to the current target opening, and at this time, the position sensor correspondingly acquires the current actual opening of the exhaust gas recirculation system valve and feeds back the current actual opening to the electronic control unit.
After the exhaust gas recirculation system valve receives the instruction for opening the current target opening, if the problem of foreign matter jamming exists, the exhaust gas recirculation system valve cannot be opened to the current target opening, so that whether jamming faults exist in the exhaust gas recirculation system valve can be known by acquiring the current actual opening and then executing the step S202.
S202, judging whether the exhaust gas recirculation system valve has a clamping stagnation fault or not based on the current actual opening and the current target opening of the exhaust gas recirculation system valve.
When the exhaust gas recirculation system valve does not have the clamping stagnation fault, theoretically, the current actual opening of the exhaust gas recirculation system valve should be consistent with the current target opening, so that whether the exhaust gas recirculation system valve has the clamping stagnation fault can be judged by comparing whether the current actual opening of the exhaust gas recirculation system valve is consistent with the current target opening.
If the exhaust gas recirculation system valve is determined to have the sticking fault, step S203 is executed.
Optionally, in consideration of the influence of factors such as machining errors, in another embodiment of the present application, when the electronic control unit executes step S202, as shown in fig. 3, the electronic control unit is specifically configured to execute the following steps:
s301, judging whether the absolute value of the difference value between the current actual opening and the current target opening of the exhaust gas recirculation system valve is larger than a preset threshold value or not.
Considering the influence of factors such as machining error, it is reasonable that there is a certain error between the current actual opening degree of the exhaust gas recirculation system valve and the current target opening degree, and it is not caused by jamming, so in this embodiment of the present application, if it is determined that the absolute value of the difference between the current actual opening degree of the exhaust gas recirculation system valve and the current target opening degree is greater than the preset threshold, step S302 is executed. If the absolute value of the difference between the current actual opening and the current target opening of the exhaust gas recirculation system valve is not greater than the preset threshold, step S303 is executed.
S302, determining that the valve of the exhaust gas recirculation system has a clamping stagnation fault.
And S303, determining that the valve of the exhaust gas recirculation system has no clamping stagnation fault.
S203, fuel supply of the engine of the target vehicle is cut off, and the engine is controlled to enter a reverse dragging mode.
Since it is determined that the valve of the exhaust gas recirculation system is stuck at this time, the fuel supply of the engine of the target vehicle is directly cut off in the embodiment of the present application in order to avoid the problems that the engine cannot normally ignite, fuel reaches the aftertreatment system without burning, and thus part of components are burned and damaged, and the like, and to avoid the influence of opening and closing of the valve of the exhaust gas recirculation system on the fuel burning during the aftertreatment process.
Since in the present embodiment, the foreign matter causing the sticking of the valve of the egr system is blown away mainly by blowing gas through the egr system valve, which is a part of the exhaust gas of the engine, it is necessary to keep the engine in operation. In the embodiment of the present application, therefore, the engine is controlled to enter the tow-down mode upon cutting off the fuel supply to the engine of the subject vehicle.
It should be noted that, during the normal running process of the vehicle, the engine fuel generates power to drive the vehicle to run. In the reverse-towing mode, the engine is not powered any more, the vehicle slides forwards by utilizing inertia, and the engine is driven to run by the inertia of the vehicle. Since the engine, now running, still draws in air from the atmosphere and discharges it, it is ensured that the exhaust gas recirculation system valve can be flushed with gas.
Optionally, in view of the current operating condition or road condition of the target vehicle, and the like, which is not suitable for the target vehicle to be in the towing back mode, in order to ensure that the vehicle can be safely ensured after entering the towing back mode, in another embodiment of the present application, the electronic control unit is further configured to execute a safety guarantee process for the safety of the target vehicle before executing step S203. As shown in fig. 4, the safety guarantee processing method of a target vehicle executed by an electronic control unit includes:
s401, feeding back target fault prompting information to a driver of the target vehicle.
And the target fault prompt information is used for prompting that the clamping stagnation fault exists in the exhaust gas recirculation system valve at present, and the clamping stagnation fault is processed by entering a drag-down mode.
In order to enable the driver to drive the target vehicle to the road where the target vehicle can safely enter the towing mode in time and enable the driver to know that the target vehicle is about to enter the towing mode, in the embodiment of the application, target fault prompt information is fed back to the driver of the target vehicle.
S402, monitoring the current operation condition of the target vehicle in real time.
And S403, judging whether the current operation condition of the target vehicle meets the target safety condition.
The target safety condition refers to a condition for ensuring safety of the vehicle when fuel supply to an engine of the vehicle is cut off and the engine is controlled to enter a tow-down mode.
Alternatively, whether the vehicle is running smoothly may be determined according to the operating condition parameters of the target vehicle, such as the vehicle speed, the engine speed, and the load, so as to determine whether the current operating condition of the target vehicle meets the target safety condition.
If the current operation condition of the target vehicle is judged to meet the target safety condition, step S404 is executed.
And S404, prompting that the driver of the target vehicle is about to start the jamming fault processing.
Note that, after the electronic control unit executes step S404, the electronic control unit executes step S203.
In order to make the driver psychological preparation to cut off the engine fuel supply and enter the tow-back mode, in the embodiment of the present application, the driver of the target vehicle is finally prompted to start the stuck fault handling.
And S204, controlling the waste gas recirculation system valve to be opened to a target opening degree so as to blow the gas flow through the waste gas recirculation system valve.
It should be noted that, because the stuck foreign matter is usually relatively small, in the embodiment of the present application, the gas blows through the exhaust gas recirculation system valve to blow away the stuck foreign matter, so the exhaust gas recirculation system valve needs to be opened to a certain opening degree.
Optionally, in order to ensure that the foreign object is more easily blown away, in this embodiment of the application, the target opening is a maximum opening, and when the corresponding electronic control unit executes step S204, the electronic control unit is specifically configured to:
and controlling the valve of the waste gas recirculation system to be opened to the maximum opening degree by sending an instruction for opening the maximum opening degree to the valve of the waste gas recirculation system.
Since the flow rate of gas flowing through the egr valve is large and it is also easier to expose foreign matter when the egr valve opening is maximum, the target opening is usually set to the maximum opening.
Of course, the target opening degree may be set to another opening degree in consideration of the stuck position of the foreign matter and the like.
And S205, closing the exhaust gas recirculation system valve after the preset time duration.
In order to ensure that the foreign bodies can be blown away, in the exemplary embodiment of the present disclosure, the exhaust gas recirculation system valve is closed only after a predetermined period of time.
Alternatively, the preset time length may be a preset fixed value, or may be a dynamic value that changes continuously according to specific situations.
Optionally, in another embodiment of the present application, the preset time duration is a dynamic value, so before the electronic control unit executes step S205, the following steps are further executed:
and finding out a target preset difference range in which the absolute value of the difference between the current actual opening and the current target opening of the exhaust gas recirculation system valve is located from the preset difference ranges, and setting the time length corresponding to the target preset difference range as a preset time length.
The larger the limit value of the preset difference range is, the longer the corresponding time length is. Because the more serious the clamping stagnation is, the longer the air flow blowing time is required to be, the foreign matter can be blown out, and the preset difference range represents the serious degree of the clamping stagnation, the larger the limit value of the preset difference range is, the longer the corresponding time length is.
Alternatively, in order to make it easier for the foreign matter to be blown out, in another embodiment of the present application, the opening and closing of the exhaust gas recirculation system valve will be repeated for a plurality of times, so in another embodiment of the present application, the electronic control unit is further configured to, before executing step S206, further execute the following steps:
and judging whether the recorded times of repeatedly opening and closing the valve of the exhaust gas recirculation system is equal to the preset times or not.
And if the recorded times of repeated opening and closing of the exhaust gas recirculation system valve is judged to be equal to the preset times, sending an instruction of opening the target detection opening degree to the exhaust gas recirculation system valve.
If the recorded times of the repeated opening and closing of the exhaust gas recirculation system valve is not equal to the preset times, adding one to the recorded times of the repeated opening and closing of the exhaust gas recirculation system valve, and returning to execute the step S204.
It should be noted that, through opening and closing the exhaust gas recirculation system valve for many times, not only can the foreign matter be separated from the valve plate of the exhaust gas recirculation system valve more easily, thereby being blown away. Furthermore, the foreign matter can be tried to be blown away by adopting different opening degrees and utilizing different air flow to find and disturb. That is, the target opening degree may be a dynamically changing value each time step S204 is performed.
S206, sending an instruction for opening the target detection opening degree to the exhaust gas recirculation system valve, and obtaining the actual detection opening degree of the exhaust gas recirculation system valve.
It should be noted that, considering that the stuck fault may be serious, the stuck fault may not be eliminated in the above manner, and the stuck condition of the exhaust gas recirculation system valve needs to be checked again.
The ECU sends a command to open the target detection opening degree to the egr valve at this time. Exhaust gas recirculation system valve can open according to the target detection aperture after receiving the instruction, so position sensor can gather the actual aperture of current exhaust gas recirculation system valve this moment, gathers the actual detection aperture promptly, so electronic control unit can follow position sensor and acquire the actual detection aperture.
Alternatively, the target detection opening degree may be the same as the current target opening degree acquired in step S201, so that whether the exhaust gas recirculation system valve has a stuck fault may be detected by the same opening degree. Of course, other opening degrees may be used, and for example, a randomly generated opening degree or a predetermined fixed opening degree may be used.
And S207, judging whether the clamping stagnation fault of the exhaust gas recirculation system valve is repaired or not based on the target detection opening and the actual detection opening of the exhaust gas recirculation system valve.
It should be noted that the specific determination manner in step S207 is the same as that in step S202, so that reference may be made to the implementation manner in step S202, which is not described herein again.
If the stuck fault of the valve of the exhaust gas recirculation system is determined to be repaired, step S208 is executed.
Alternatively, considering that the stuck fault of the exhaust gas recirculation system valve may be serious and cannot be repaired by itself by the above method, the driver needs to be informed to perform maintenance by a manual method, so in another embodiment of the present application, the electronic control unit is further configured to:
and if the clamping stagnation fault of the exhaust gas recirculation system valve is not repaired, feeding back target alarm prompt information.
The target alarm prompt information is used for prompting that the clamping stagnation fault of the exhaust gas recirculation system valve is not automatically repaired and needs to be manually maintained.
Optionally, since the stuck fault cannot be repaired by itself at this time, and the repair is performed manually, the driver needs to continue driving, and the vehicle is still in a driving state, so in another embodiment of the present application, the electronic control unit is further configured to:
and when the clamping failure of the exhaust gas recirculation system valve is judged not to be repaired, the fuel supply of the engine of the target vehicle is recovered, and the engine is controlled to enter a torque limiting mode.
Since the distance traveled by the vehicle is limited in the tow-back mode, the fuel supply of the engine of the target vehicle is restored at this time so that the vehicle can travel to a service point for service. However, in order to avoid the influence on the engine and the aftertreatment system, the engine is controlled to enter a torque limiting mode, namely, the torque of the engine is limited to be not larger than a threshold value.
And S208, recovering the normal operation of the engine.
Specifically, the engine is restored to fuel supply, and the reverse-towing mode is exited to return to the normal operation mode.
Optionally, in another embodiment of the present application, when the electronic control unit executes step S208, the electronic control unit is specifically configured to:
the engine of the target vehicle is restored from its fuel supply, and the target vehicle is adjusted to a gear that matches the current vehicle speed of the target vehicle.
Because the car that leads to can continue normally to drive the vehicle after the jamming trouble is restoreed, so link up better in order to let the driver intervene the driving to and in order to guarantee safety, so in this application embodiment, can automatic acquisition target vehicle current speed, then adjust target vehicle to the gear with target vehicle's current speed assorted.
Of course, this is only an optional way, and it may also be that the shift operation is performed by the driver according to the vehicle speed, and only the shift operation is adjusted to the neutral position, and if the vehicle is on a downhill road, there is a certain risk.
Alternatively, since the driver can drive normally after the normal operation of the engine is resumed, the driver can intervene in driving in time, so in another embodiment of the present application, after executing step S208, the electronic control unit is further configured to:
and feeding back fault repair prompt information to a driver of the target vehicle.
Wherein the fault repair prompt message is used for prompting that the clamping stagnation fault of the exhaust gas recirculation system valve is eliminated and the normal operation of the vehicle is recovered.
The embodiment of the application provides a valve jamming processing system which comprises a position sensor and an electronic control unit. The position sensor is used for acquiring the current actual opening degree of the exhaust gas recirculation system valve of the target vehicle. The electronic control unit is used for: the method comprises the steps of determining the current target opening of an exhaust gas recirculation system valve of a target vehicle in real time, and receiving the current actual opening of the exhaust gas recirculation system valve of the target vehicle, which is acquired by a position sensor, so as to judge whether the exhaust gas recirculation system valve has a clamping stagnation fault or not based on the current actual opening and the current target opening of the exhaust gas recirculation system valve. If the clamping failure of the valve of the exhaust gas recirculation system is judged, fuel supply of an engine of a target vehicle is cut off, the engine is controlled to enter a dragging mode, the problems that fuel enters the post-processing system to be combusted, parts of the post-processing system are burnt and damaged and the like are avoided, and gas flows into the exhaust gas recirculation system are also guaranteed. And then, controlling the valve of the waste gas recirculation system to be opened to a target opening, blowing the air flow through the valve of the waste gas recirculation system, and closing the valve of the waste gas recirculation system after the air flow lasts for a preset time length, so that the air flow can be used for blowing out the foreign matters causing the clamping stagnation. And then sending an instruction for opening the target detection opening degree to the exhaust gas recirculation system valve, acquiring the actual detection opening degree of the exhaust gas recirculation system valve, and judging whether the clamping failure of the exhaust gas recirculation system valve is repaired or not based on the target detection opening degree and the actual detection opening degree of the exhaust gas recirculation system valve. And if the clamping stagnation fault of the repaired exhaust gas recirculation system valve is judged, the normal operation of the engine is recovered. Therefore, when the clamping stagnation fault of the valve of the exhaust gas recirculation system is monitored, the problems that fuel enters the post-processing system to be combusted, parts of the post-processing system are burnt and damaged and the like can be effectively avoided, the clamping stagnation fault can be automatically and timely eliminated, and normal running of a vehicle can be quickly recovered.
Another embodiment of the present application provides an electronic control unit, as shown in fig. 5, including the following units:
the opening monitoring unit 501 is configured to determine a current target opening of an egr valve of a target vehicle in real time, and receive a current actual opening of the egr valve of the target vehicle, which is acquired by a position sensor.
The first determining unit 502 is configured to determine whether the egr valve has a stuck fault based on a current actual opening and a current target opening of the egr valve.
And an engine control unit 503 for cutting off fuel supply to the engine of the target vehicle and controlling the engine to enter a reverse towing mode when it is determined that the exhaust gas recirculation system valve has the stuck fault.
A valve opening unit 504 for controlling the exhaust gas recirculation system valve to open to a target opening such that the gas flow blows through the exhaust gas recirculation system valve.
And a valve closing unit 505 for closing the exhaust gas recirculation system valve after the preset time duration.
The detecting unit 506 is configured to send an instruction to open the target detection opening degree to the egr valve, and obtain an actual detection opening degree of the egr valve.
The second determining unit 507 is configured to determine whether the sticking fault of the egr valve has been repaired based on the target detection opening and the actual detection opening of the egr valve.
And the recovery unit 508 is used for recovering the normal operation of the engine when the clamping failure of the repaired exhaust gas recirculation system valve is judged.
Optionally, in an electronic control unit provided in another embodiment of the present application, the first determining unit includes:
and the first judgment subunit is used for judging whether the absolute value of the difference value between the current actual opening and the current target opening of the exhaust gas recirculation system valve is greater than a preset threshold value.
The first determining unit is used for determining that the exhaust gas recirculation system valve has a clamping stagnation fault when the absolute value of the difference value between the current actual opening and the current target opening of the exhaust gas recirculation system valve is judged to be larger than a preset threshold value.
And the second determining unit is used for determining that the exhaust gas recirculation system valve has no clamping stagnation fault when the absolute value of the difference value between the current actual opening and the current target opening of the exhaust gas recirculation system valve is judged to be not greater than the preset threshold value.
Optionally, in an electronic control unit provided in another embodiment of the present application, the target opening degree is a maximum opening degree, and the valve opening unit includes:
and the valve opening subunit is used for controlling the valve of the exhaust gas recirculation system to be opened to the maximum opening degree by sending an instruction for opening the maximum opening degree to the valve of the exhaust gas recirculation system.
Optionally, in an electronic control unit provided in another embodiment of the present application, the electronic control unit further includes:
and the third judging unit is used for judging whether the recorded times of repeatedly opening and closing the valve of the exhaust gas recirculation system is equal to the preset times or not. When the recorded times of repeated opening and closing of the exhaust gas recirculation system valve are judged to be equal to the preset times, the detection unit executes an instruction of sending the opening target detection opening degree to the exhaust gas recirculation system valve.
And the accumulation unit is used for adding one to the recorded repeated opening and closing times of the waste gas recirculation system valve and returning the result to the valve opening unit when the recorded repeated opening and closing times of the waste gas recirculation system valve are judged to be not equal to the preset times.
Optionally, in an electronic control unit provided in another embodiment of the present application, the electronic control unit further includes:
and the first prompting unit is used for feeding back target fault prompting information to a driver of the target vehicle. And the target fault prompt information is used for prompting that the clamping stagnation fault exists in the exhaust gas recirculation system valve at present, and the clamping stagnation fault is processed by entering a drag-down mode.
And the working condition monitoring unit is used for monitoring the current running working condition of the target vehicle in real time.
And the fourth judgment unit is used for judging whether the current operation working condition of the target vehicle meets the target safety condition. The target safety condition refers to a condition for ensuring the safety of the vehicle when the fuel supply to the engine of the vehicle is cut off and the engine is controlled to enter the tow-back mode.
And the second prompting unit is used for prompting a driver of the target vehicle to start jamming fault processing when the current operation working condition of the target vehicle is judged to meet the target safety condition.
Optionally, in an electronic control unit provided in another embodiment of the present application, the electronic control unit further includes:
and the third prompting unit is used for feeding back fault repairing prompting information to the driver of the target vehicle. Wherein the fault repair prompt message is used for prompting that the clamping stagnation fault of the exhaust gas recirculation system valve is eliminated and the normal operation of the vehicle is recovered.
Optionally, in an electronic control unit provided in another embodiment of the present application, the electronic control unit further includes:
and the feedback unit is used for feeding back target alarm prompt information when the clamping stagnation fault of the valve of the exhaust gas recirculation system is judged not to be repaired. The target alarm prompt information is used for prompting that the clamping stagnation fault of the exhaust gas recirculation system valve is not automatically repaired and needs to be manually maintained.
Optionally, in an electronic control unit provided in another embodiment of the present application, the electronic control unit further includes:
and the torque limiting unit is used for recovering fuel supply of an engine of the target vehicle and controlling the engine to enter a torque limiting mode when the clamping failure of the exhaust gas recirculation system valve is judged not to be repaired.
Optionally, in an electronic control unit provided in another embodiment of the present application, the electronic control unit further includes:
the searching unit is used for searching a target preset difference range in which the absolute value of the difference value between the current actual opening and the current target opening of the exhaust gas recirculation system valve is located from each preset difference range;
the setting unit is used for setting the time length corresponding to the target preset difference value range as the preset time length; the larger the limit value of the preset difference range is, the longer the corresponding time length is.
Optionally, in an electronic control unit provided in another embodiment of the present application, the recovery unit includes:
a recovery subunit for recovering fuel supply to an engine of the target vehicle and adjusting the target vehicle to a gear that matches a current vehicle speed of the target vehicle.
It should be noted that, for the specific implementation process of each unit provided in the foregoing embodiment of the present application, reference may be made to the implementation process of each step executed by the electronic control unit in the foregoing system, and details are not described here again.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A system for treating valve sticking, comprising:
a position sensor and an electronic control unit;
the position sensor is used for acquiring the current actual opening degree of a valve of an exhaust gas recirculation system of the target vehicle in real time;
the electronic control unit is used for determining the current target opening degree of the exhaust gas recirculation system valve of the target vehicle in real time and receiving the current actual opening degree of the exhaust gas recirculation system valve of the target vehicle acquired by the position sensor;
determining whether a sticking fault exists in the exhaust gas recirculation system valve based on the current actual opening and the current target opening of the exhaust gas recirculation system valve;
if the exhaust gas recirculation system valve is judged to have the clamping stagnation fault, cutting off fuel supply of an engine of the target vehicle, and controlling the engine to enter a reverse dragging mode;
controlling the exhaust gas recirculation system valve to open to a target opening to blow a gas flow through the exhaust gas recirculation system valve;
after a preset length of time, closing the exhaust gas recirculation system valve;
sending an instruction for opening a target detection opening degree to the exhaust gas recirculation system valve, and acquiring an actual detection opening degree of the exhaust gas recirculation system valve;
determining whether a stuck fault of the EGR valve has been repaired based on the target detected opening and the actual detected opening of the EGR valve;
if the clamping stagnation fault of the exhaust gas recirculation system valve is repaired, recovering the normal operation of the engine;
feeding back target failure prompt information to a driver of the target vehicle before performing the fuel cut of an engine of the target vehicle and controlling the engine to enter a towing mode; the target fault prompting information is used for prompting that the clamping stagnation fault exists in the exhaust gas recirculation system valve at present, and the clamping stagnation fault is processed by entering a drag-down mode;
monitoring the current operation condition of the target vehicle in real time;
judging whether the current operation condition of the target vehicle meets a target safety condition; wherein the target safety condition refers to a condition for ensuring safety of the vehicle when fuel supply to an engine of the vehicle is cut off and the engine is controlled to enter a tow-back mode;
and if the current operation condition of the target vehicle is judged to meet the target safety condition, prompting a driver of the target vehicle to start the jamming fault treatment.
2. The system of claim 1, wherein the electronic control unit is configured to, when determining whether the egr valve has the stuck fault based on the current actual opening and the current target opening of the egr valve,:
judging whether the absolute value of the difference value between the current actual opening and the current target opening of the exhaust gas recirculation system valve is larger than a preset threshold value or not;
if the absolute value of the difference value between the current actual opening and the current target opening of the exhaust gas recirculation system valve is judged to be larger than a preset threshold value, determining that the exhaust gas recirculation system valve has a clamping stagnation fault;
and if the absolute value of the difference value between the current actual opening and the current target opening of the exhaust gas recirculation system valve is judged to be not larger than a preset threshold value, determining that the exhaust gas recirculation system valve has no clamping stagnation fault.
3. The system of claim 1, wherein the target opening is a maximum opening, and the electronic control unit performs the controlling of the exhaust gas recirculation system valve to open to the target opening for:
and controlling the valve of the waste gas recirculation system to be opened to the maximum opening degree by sending an instruction of opening the maximum opening degree to the valve of the waste gas recirculation system.
4. The valve stuck process system of claim 1, wherein said electronic control unit is further configured to:
before the command of opening the target detection opening degree is sent to the exhaust gas recirculation system valve, whether the recorded times of repeatedly opening and closing the exhaust gas recirculation system valve are equal to preset times or not is judged; if the recorded times of repeated opening and closing of the waste gas recirculation system valve is equal to the preset times, executing the instruction of sending the opening target detection opening degree to the waste gas recirculation system valve;
and if the recorded times of repeatedly opening and closing the waste gas recirculation system valve are not equal to the preset times, adding one to the recorded times of repeatedly opening and closing the waste gas recirculation system valve, and returning to execute the control of opening the waste gas recirculation system valve to the target opening.
5. The valve stuck process system of claim 1, wherein said electronic control unit is further configured to:
feeding back a failure repair prompt message to a driver of the target vehicle after the restoration of the normal operation of the engine is performed; and the fault repairing prompt message is used for prompting that the clamping stagnation fault of the exhaust gas recirculation system valve is eliminated and the normal operation of the vehicle is recovered.
6. The valve stuck process system of claim 1, wherein said electronic control unit is further configured to:
if the clamping stagnation fault of the exhaust gas recirculation system valve is judged not to be repaired, feeding back target alarm prompt information; the target alarm prompt information is used for prompting that the clamping stagnation fault of the exhaust gas recirculation system valve is not automatically repaired and needs to be manually maintained.
7. The valve stuck handling system according to claim 1, wherein said electronic control unit is further configured to:
and if the clamping stagnation fault of the exhaust gas recirculation system valve is not repaired, recovering the fuel supply of the engine of the target vehicle, and controlling the engine to enter a torque limiting mode.
8. The valve stuck process system of claim 2, wherein said electronic control unit is further configured to:
finding out a target preset difference range in which the absolute value of the difference between the current actual opening and the current target opening of the exhaust gas recirculation system valve is located from each preset difference range;
setting the time length corresponding to the target preset difference range as the preset time length; the larger the limit value of the preset difference range is, the longer the corresponding time length is.
9. The system for managing valve sticking as defined in claim 1, wherein said electronic control unit executes said restoring of normal operation of said engine for:
resuming the fueling of the engine of the target vehicle and adjusting the target vehicle to a gear that matches the current vehicle speed of the target vehicle.
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| CN114320678A (en) * | 2021-10-29 | 2022-04-12 | 东风商用车有限公司 | EGR valve clamping stagnation diagnosis solving device and using method thereof |
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| KR101816429B1 (en) * | 2016-08-10 | 2018-01-08 | 현대자동차주식회사 | Method for Removing EGR Impurity by using Air Blowing, Exhaust Gas Recirculation System and Vehicle thereof |
| GB2583336A (en) * | 2019-04-23 | 2020-10-28 | Delphi Automotive Systems Lux | Method of determining a fault in an engine with EGR |
| CN113803184B (en) * | 2020-06-12 | 2023-08-29 | 卓品智能科技无锡有限公司 | Method for detecting whether pressure limiting valve is clamped at closed position |
| CN111890927B (en) * | 2020-08-07 | 2021-10-26 | 中国重汽集团济南动力有限公司 | Heavy vehicle driving performance limiting method |
| CN112282987A (en) * | 2020-10-30 | 2021-01-29 | 东风汽车集团有限公司 | External cooling type EGR coking removal control method for gasoline engine |
| CN112576382A (en) * | 2021-03-01 | 2021-03-30 | 潍柴动力股份有限公司 | Purging control method and device for engine |
| CN113187629A (en) * | 2021-03-29 | 2021-07-30 | 广西玉柴机器股份有限公司 | Method and device for processing state of EGR valve |
| CN114810376B (en) * | 2021-07-05 | 2023-06-30 | 长城汽车股份有限公司 | Method, device, storage medium and electronic equipment for controlling engine air inflow |
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| CN114320678A (en) * | 2021-10-29 | 2022-04-12 | 东风商用车有限公司 | EGR valve clamping stagnation diagnosis solving device and using method thereof |
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