CN114320678A - EGR valve clamping stagnation diagnosis solving device and using method thereof - Google Patents
EGR valve clamping stagnation diagnosis solving device and using method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of automobile engines, and discloses a device for diagnosing and solving EGR valve clamping stagnation. The invention also discloses a use method of the EGR valve clamping stagnation diagnosis solution device. The EGR valve jamming diagnosis solving device and the using method thereof can diagnose whether the EGR valve is jammed or not, eliminate the jamming of the EGR valve and perform self-cleaning on the EGR valve.
Description
Technical Field
The invention relates to the technical field of automobile engines, in particular to an EGR valve clamping stagnation diagnosis solving device and a using method thereof.
Background
With the upgrading of regulations, the emission requirements of engines are higher and higher, and in order to reduce the emission of NOx, most of the diesel engines adopt the technical routes of EGR + DOC + DPF + SCR. When the EGR valve works in a high-temperature and high-pressure exhaust gas environment, carbon deposition is easily formed on a valve plate of the EGR valve after a long time, and clamping stagnation is easily generated over time, so that the performance and the emission level of an engine are influenced.
The current EGR valve control is mainly position closed loop feedback control, and no diagnosis solution of EGR valve jamming exists. When clamping stagnation occurs, the system cannot automatically diagnose and solve the problem, and only can be disassembled, checked and replaced manually, thereby wasting time and labor.
Chinese patent publication No. CN113063582A, publication No. 07/02/2021, discloses an EGR valve diagnostic method, apparatus, device, and readable storage medium. The method comprises the following steps: when the EGR valve is determined to be abnormal according to the temperature value acquired by the EGR monitoring temperature sensor, the EGR valve is triggered and opened for N times according to different opening degrees under the working condition of deceleration and fuel cut, the average value of MAP with the change rate smaller than the first preset change rate in the first preset time after the EGR valve is triggered and opened each time is compared with the MAP range corresponding to the opening sequence, and the diagnosis result is obtained according to the comparison result. According to the invention, after the EGR valve is triggered and opened once, the EGR valve is triggered and opened again as long as the change rate of the MAP is less than the first preset change rate within the first preset time, the EGR valve can be triggered and opened for multiple times at different opening degrees within a short time, the time required by diagnosis is shortened, and double judgment is carried out based on the temperature value acquired by the EGR monitoring temperature sensor and the MAP, so that the accuracy of the diagnosis result is ensured. However, the method can only carry out diagnosis, can not eliminate the clamping stagnation, can only be manually disassembled, checked and replaced, and is time-consuming and labor-consuming.
Chinese patent (published: 2021, 03/16/2021, publication: CN212716936U) discloses an anti-icing cold end EGR valve and engine EGR system, which comprises an EGR valve body and a valve plate arranged in the EGR valve body, wherein a first heater which is fully distributed on the whole valve wall is embedded in the valve wall of the EGR valve body; the second heater penetrating through the whole valve plate is embedded in the valve plate. This cold junction EGR valve is at the actual work in-process, when the engine starts under cold condition, can heat cold junction EGR valve through starting first heater and/or second heater to can effectively avoid cold junction EGR valve at the cold district because freeze the problem of jamming, also avoided because the EGR valve can't open, the NOX that leads to risees, the emergence of the engine limit torsion condition. The EGR valve can be prevented from being blocked to a certain extent, but the problem cannot be solved fundamentally.
Chinese patent (publication No. CN205477993U, No. 17/08/2016) discloses a temperature-controlled EGR valve. The problem that the EGR valve can not control the temperature is mainly solved. The EGR valve body is close to air inlet department and is equipped with temperature sensor, be equipped with coolant liquid import and coolant liquid export on the cooler, the valve is installed to coolant liquid import department, be equipped with the bellows on the connecting pipe, valve and temperature sensor all link to each other with vehicle ECU. This control by temperature change EGR valve sealing performance is good, can the gaseous temperature of effective control EGR valve, can avoid because of gas temperature high ablation EGR valve, also can avoid because of gas temperature crosses lowly, and deposit too much the thing of gluing in the EGR valve body, make the EGR valve produce the jamming phenomenon, make whole EGR system's inefficacy, this equipment cost is cheap, practical convenient, the processing is effectual, the non-staining environment, easily popularization. The EGR valve can be prevented from being blocked to a certain extent, but the problem cannot be solved fundamentally.
Disclosure of Invention
The invention aims to provide a device for diagnosing and solving the clamping stagnation of the EGR valve and a using method thereof, which can diagnose whether the EGR valve is clamped or not, eliminate the clamping stagnation of the EGR valve and perform self-cleaning on the EGR valve.
In order to achieve the purpose, the EGR valve clamping stagnation diagnosis solution device provided by the invention integrates a position sensor signal processing module, an H-bridge circuit driving module and an EGR valve position closed-loop control module in an engine electric control unit, a torque motor and a valve sheet opening position sensor are arranged in the EGR valve, and the engine electric control unit controls the opening of the EGR valve through the H-bridge driving circuit.
When an engine works normally, an engine electric control unit sends an opening signal according to the required position of the EGR valve, the opening signal is converted into a driving signal PWM through an H-bridge circuit driving module, then the H-bridge driving circuit is controlled to drive a torque motor in the EGR valve, the EGR valve is driven to act, a valve plate opening position sensor feeds back an actual position signal of the EGR valve to the engine electric control unit, a position sensor signal processing module processes the actual position signal fed back by the valve plate opening position sensor to obtain the actual position of the EGR valve, and an EGR valve position closed-loop control module continues to perform closed-loop control according to the deviation between the required position and the actual position of the EGR valve until the required position is consistent with the actual position.
Preferably, when the engine is working, the engine electronic control unit monitors the required position and the actual position of the EGR valve, when the actual position of the EGR valve is consistent with the required position, the EGR valve works normally, and when the required position of the EGR valve is inconsistent with the actual position, the clamping stagnation state is diagnosed.
Preferably, when the EGR valve is diagnosed as a stuck state, the engine electronic control unit makes a response plan, and at an afterrun stage after the engine is turned off and powered off, the engine electronic control unit continuously sends an opening degree signal of 0% to 100% for several times to the EGR valve, and the opening degree signal is converted into a driving signal PWM through an H-bridge circuit driving module, so as to control an H-bridge driving circuit to drive a torque motor in the EGR valve and drive the EGR valve to perform several actions.
Preferably, after the response plan is completed, after the engine is started next time, the engine electronic control unit monitors the required position and the actual position of the EGR valve, when the actual position of the EGR valve is consistent with the required position, the EGR valve works normally at the moment, the jamming problem is solved, and when the required position of the EGR valve is inconsistent with the actual position, the jamming problem is not solved.
Preferably, if the required position of the EGR valve is inconsistent with the actual position, the engine electronic control unit alarms that the EGR valve has a clamping stagnation fault and prompts a customer to enter an S shop for maintenance treatment.
Preferably, if the demanded position of the EGR valve is not consistent with the actual position, and the deviation value of the demanded position of the EGR valve from the actual position is reduced compared to that before the response plan is implemented, and the reduced value is greater than a preset value, the response plan is repeated until the actual position of the EGR valve is consistent with the demanded position or the deviation value of the demanded position of the EGR valve from the actual position is reduced by a value less than a preset value.
Preferably, when the deviation value of the required position of the EGR valve and the actual position is reduced to be smaller than a preset value, the engine electronic control unit alarms that the EGR valve has a clamping stagnation fault and prompts a customer to enter a 4S shop for maintenance treatment.
Preferably, the number of times that the engine electronic control unit continuously sends out the 0% to 100% opening degree signal is not less than three times.
Preferably, when the engine electronic control unit sends a 0% to 100% opening signal to drive the torque motor to operate, the maximum current value is smaller than the current protection limit of the torque motor, so as to prevent the torque motor from being burnt by excessive current.
Compared with the prior art, the invention has the following advantages:
1. whether the EGR valve is clamped or not can be diagnosed by comparing the actual position of the EGR valve with the required position;
2. through the electric afterrun stage under the engine, to the reciprocal quick action of EGR valve execution, can eliminate EGR valve jamming, clean oneself to the EGR valve, promote the life of EGR valve, reduce user use cost.
Drawings
FIG. 1 is a schematic structural view of an EGR valve stuck diagnostic resolving apparatus of the present invention;
FIG. 2 is a schematic diagram of a diagnostic strategy for a method of using the EGR valve stuck diagnostic resolution apparatus of the present invention.
The components in the figures are numbered as follows:
the system comprises an engine electronic control unit 1, a position sensor signal processing module 2, an H-bridge circuit driving module 3, an EGR valve position closed-loop control module 4, an EGR valve 5, a torque motor 6, a valve sheet opening position sensor 7 and an H-bridge driving circuit 8.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, and it is to be understood that the technical solutions in the embodiments of the present invention are described clearly and completely.
Example 1
As shown in FIG. 1, a device for diagnosing and solving the stuck of the EGR valve integrates a position sensor signal processing module 2, an H-bridge circuit driving module 3 and an EGR valve position closed-loop control module 4 in an engine electronic control unit 1, a torque motor 6 and a valve plate opening position sensor 7 are arranged in the EGR valve 5, and the engine electronic control unit 1 controls the opening of the EGR valve 5 through an H-bridge driving circuit 8.
When the device for diagnosing and solving the jamming of the EGR valve 5 is used, under normal operation of an engine, the engine electronic control unit 1 sends an opening signal according to a required position of the EGR valve 5, the opening signal is converted into a driving signal PWM through the H-bridge circuit driving module 3, and then the H-bridge driving circuit 8 is controlled to drive the torque motor 6 in the EGR valve 5, so as to drive the EGR valve 5 to act, the valve sheet opening position sensor 7 feeds back an actual position signal of the EGR valve 5 to the engine electronic control unit 1, and the position sensor signal processing module 2 processes the actual position signal fed back by the valve sheet opening position sensor 7 to obtain an actual position of the EGR valve 5, as shown in FIG. 2, the EGR valve position closed-loop control module 4 continues to perform closed-loop control according to a deviation between the required position and the actual position of the EGR valve 5 until the required position is consistent with the actual position.
Example 2
A position sensor signal processing module 2, an H-bridge circuit driving module 3 and an EGR valve position closed-loop control module 4 are integrated in an engine electronic control unit 1, a torque motor 6 and a valve sheet opening position sensor 7 are arranged in an EGR valve 5, and the engine electronic control unit 1 controls the opening of the EGR valve 5 through an H-bridge driving circuit 8.
When the device for diagnosing and solving the jamming of the EGR valve 5 is used, under the normal work of an engine, the engine electronic control unit 1 sends an opening signal according to the required position of the EGR valve 5, the opening signal is converted into a driving signal PWM through the H-bridge circuit driving module 3, the H-bridge driving circuit 8 is further controlled to drive the torque motor 6 in the EGR valve 5, the EGR valve 5 is driven to act, the actual position signal of the EGR valve 5 is fed back to the engine electronic control unit 1 by the valve plate opening position sensor 7, the position sensor signal processing module 2 processes the actual position signal fed back by the valve plate opening position sensor 7 to obtain the actual position of the EGR valve 5, and the closed-loop control module 4 of the EGR valve position continues to perform closed-loop control according to the deviation between the required position and the actual position of the EGR valve 5 until the required position is consistent with the actual position. When the engine electronic control unit 1 monitors the required position and the actual position of the EGR valve 5, when the actual position of the EGR valve 5 coincides with the required position, the EGR valve 5 operates normally, and when the required position of the EGR valve 5 does not coincide with the actual position, a stuck state is diagnosed.
Example 3
A position sensor signal processing module 2, an H-bridge circuit driving module 3 and an EGR valve position closed-loop control module 4 are integrated in an engine electronic control unit 1, a torque motor 6 and a valve sheet opening position sensor 7 are arranged in an EGR valve 5, and the engine electronic control unit 1 controls the opening of the EGR valve 5 through an H-bridge driving circuit 8.
When the device for diagnosing and solving the jamming of the EGR valve 5 is used, under the normal work of an engine, the engine electronic control unit 1 sends an opening signal according to the required position of the EGR valve 5, the opening signal is converted into a driving signal PWM through the H-bridge circuit driving module 3, the H-bridge driving circuit 8 is further controlled to drive the torque motor 6 in the EGR valve 5, the EGR valve 5 is driven to act, the actual position signal of the EGR valve 5 is fed back to the engine electronic control unit 1 by the valve plate opening position sensor 7, the position sensor signal processing module 2 processes the actual position signal fed back by the valve plate opening position sensor 7 to obtain the actual position of the EGR valve 5, and the closed-loop control module 4 of the EGR valve position continues to perform closed-loop control according to the deviation between the required position and the actual position of the EGR valve 5 until the required position is consistent with the actual position. When the engine electronic control unit 1 monitors the required position and the actual position of the EGR valve 5, when the actual position of the EGR valve 5 coincides with the required position, the EGR valve 5 operates normally, and when the required position of the EGR valve 5 does not coincide with the actual position, a stuck state is diagnosed.
When the EGR valve 5 is diagnosed to be in a stuck state, the engine electronic control unit 1 makes a response plan, and in an afterward stage after the engine is shut down and powered off, the engine electronic control unit 1 continuously sends opening signals of 0% to 100% to the EGR valve 5 for three times, the opening signals are converted into driving signals PWM through the H-bridge circuit driving module 3, and then the H-bridge driving circuit 8 is controlled to drive the torque motor 6 in the EGR valve 5 to drive the EGR valve 5 to perform three times of actions.
Example 4
A position sensor signal processing module 2, an H-bridge circuit driving module 3 and an EGR valve position closed-loop control module 4 are integrated in an engine electronic control unit 1, a torque motor 6 and a valve sheet opening position sensor 7 are arranged in an EGR valve 5, and the engine electronic control unit 1 controls the opening of the EGR valve 5 through an H-bridge driving circuit 8.
When the device for diagnosing and solving the jamming of the EGR valve 5 is used, under the normal work of an engine, the engine electronic control unit 1 sends an opening signal according to the required position of the EGR valve 5, the opening signal is converted into a driving signal PWM through the H-bridge circuit driving module 3, the H-bridge driving circuit 8 is further controlled to drive the torque motor 6 in the EGR valve 5, the EGR valve 5 is driven to act, the actual position signal of the EGR valve 5 is fed back to the engine electronic control unit 1 by the valve plate opening position sensor 7, the position sensor signal processing module 2 processes the actual position signal fed back by the valve plate opening position sensor 7 to obtain the actual position of the EGR valve 5, and the closed-loop control module 4 of the EGR valve position continues to perform closed-loop control according to the deviation between the required position and the actual position of the EGR valve 5 until the required position is consistent with the actual position. When the engine electronic control unit 1 monitors the required position and the actual position of the EGR valve 5, when the actual position of the EGR valve 5 coincides with the required position, the EGR valve 5 operates normally, and when the required position of the EGR valve 5 does not coincide with the actual position, a stuck state is diagnosed.
When the EGR valve 5 is diagnosed to be in a stuck state, the engine electronic control unit 1 makes a response plan, and in an afterward stage after the engine is shut down and powered off, the engine electronic control unit 1 continuously sends opening signals of 0% to 100% to the EGR valve 5 for four times, the opening signals are converted into driving signals PWM through the H-bridge circuit driving module 3, and then the H-bridge driving circuit 8 is controlled to drive the torque motor 6 in the EGR valve 5, and the EGR valve 5 is driven to perform four times of actions.
Example 5
A position sensor signal processing module 2, an H-bridge circuit driving module 3 and an EGR valve position closed-loop control module 4 are integrated in an engine electronic control unit 1, a torque motor 6 and a valve sheet opening position sensor 7 are arranged in an EGR valve 5, and the engine electronic control unit 1 controls the opening of the EGR valve 5 through an H-bridge driving circuit 8.
When the device for diagnosing and solving the jamming of the EGR valve 5 is used, under the normal work of an engine, the engine electronic control unit 1 sends an opening signal according to the required position of the EGR valve 5, the opening signal is converted into a driving signal PWM through the H-bridge circuit driving module 3, the H-bridge driving circuit 8 is further controlled to drive the torque motor 6 in the EGR valve 5, the EGR valve 5 is driven to act, the actual position signal of the EGR valve 5 is fed back to the engine electronic control unit 1 by the valve plate opening position sensor 7, the position sensor signal processing module 2 processes the actual position signal fed back by the valve plate opening position sensor 7 to obtain the actual position of the EGR valve 5, and the closed-loop control module 4 of the EGR valve position continues to perform closed-loop control according to the deviation between the required position and the actual position of the EGR valve 5 until the required position is consistent with the actual position. When the engine electronic control unit 1 monitors the required position and the actual position of the EGR valve 5, when the actual position of the EGR valve 5 coincides with the required position, the EGR valve 5 operates normally, and when the required position of the EGR valve 5 does not coincide with the actual position, a stuck state is diagnosed.
When the EGR valve 5 is diagnosed to be in a stuck state, the engine electronic control unit 1 makes a response plan, and in an afterward stage after the engine is shut down and powered off, the engine electronic control unit 1 continuously sends opening signals of 0% to 100% to the EGR valve 5 for three times, the opening signals are converted into driving signals PWM through the H-bridge circuit driving module 3, and then the H-bridge driving circuit 8 is controlled to drive the torque motor 6 in the EGR valve 5 to drive the EGR valve 5 to perform three times of actions.
After the response plan is completed and the engine is started next time, the engine electronic control unit 1 monitors the required position and the actual position of the EGR valve 5, when the actual position of the EGR valve 5 is consistent with the required position, the EGR valve 5 works normally at the moment, the clamping stagnation problem is solved, and when the required position of the EGR valve 5 is inconsistent with the actual position, the clamping stagnation problem is not solved.
Example 6
A position sensor signal processing module 2, an H-bridge circuit driving module 3 and an EGR valve position closed-loop control module 4 are integrated in an engine electronic control unit 1, a torque motor 6 and a valve sheet opening position sensor 7 are arranged in an EGR valve 5, and the engine electronic control unit 1 controls the opening of the EGR valve 5 through an H-bridge driving circuit 8.
When the device for diagnosing and solving the jamming of the EGR valve 5 is used, under the normal work of an engine, the engine electronic control unit 1 sends an opening signal according to the required position of the EGR valve 5, the opening signal is converted into a driving signal PWM through the H-bridge circuit driving module 3, the H-bridge driving circuit 8 is further controlled to drive the torque motor 6 in the EGR valve 5, the EGR valve 5 is driven to act, the actual position signal of the EGR valve 5 is fed back to the engine electronic control unit 1 by the valve plate opening position sensor 7, the position sensor signal processing module 2 processes the actual position signal fed back by the valve plate opening position sensor 7 to obtain the actual position of the EGR valve 5, and the closed-loop control module 4 of the EGR valve position continues to perform closed-loop control according to the deviation between the required position and the actual position of the EGR valve 5 until the required position is consistent with the actual position. When the engine electronic control unit 1 monitors the required position and the actual position of the EGR valve 5, when the actual position of the EGR valve 5 coincides with the required position, the EGR valve 5 operates normally, and when the required position of the EGR valve 5 does not coincide with the actual position, a stuck state is diagnosed.
When the EGR valve 5 is diagnosed to be in a stuck state, the engine electronic control unit 1 makes a response plan, and in an afterward stage after the engine is shut down and powered off, the engine electronic control unit 1 continuously sends opening signals of 0% to 100% to the EGR valve 5 for three times, the opening signals are converted into driving signals PWM through the H-bridge circuit driving module 3, and then the H-bridge driving circuit 8 is controlled to drive the torque motor 6 in the EGR valve 5 to drive the EGR valve 5 to perform three times of actions.
After the response plan is finished, after the engine is started next time, the engine electronic control unit 1 monitors the required position and the actual position of the EGR valve 5, when the actual position of the EGR valve 5 is consistent with the required position, the EGR valve 5 works normally at the moment, the clamping stagnation problem is solved, when the required position of the EGR valve 5 is inconsistent with the actual position, the clamping stagnation problem is not solved, the engine electronic control unit 1 alarms that the EGR valve 5 has the clamping stagnation fault, and a customer is prompted to enter a 4S shop for maintenance and treatment.
Example 7
A position sensor signal processing module 2, an H-bridge circuit driving module 3 and an EGR valve position closed-loop control module 4 are integrated in an engine electronic control unit 1, a torque motor 6 and a valve sheet opening position sensor 7 are arranged in an EGR valve 5, and the engine electronic control unit 1 controls the opening of the EGR valve 5 through an H-bridge driving circuit 8.
When the device for diagnosing and solving the jamming of the EGR valve 5 is used, under the normal work of an engine, the engine electronic control unit 1 sends an opening signal according to the required position of the EGR valve 5, the opening signal is converted into a driving signal PWM through the H-bridge circuit driving module 3, the H-bridge driving circuit 8 is further controlled to drive the torque motor 6 in the EGR valve 5, the EGR valve 5 is driven to act, the actual position signal of the EGR valve 5 is fed back to the engine electronic control unit 1 by the valve plate opening position sensor 7, the position sensor signal processing module 2 processes the actual position signal fed back by the valve plate opening position sensor 7 to obtain the actual position of the EGR valve 5, and the closed-loop control module 4 of the EGR valve position continues to perform closed-loop control according to the deviation between the required position and the actual position of the EGR valve 5 until the required position is consistent with the actual position. When the engine electronic control unit 1 monitors the required position and the actual position of the EGR valve 5, when the actual position of the EGR valve 5 coincides with the required position, the EGR valve 5 operates normally, and when the required position of the EGR valve 5 does not coincide with the actual position, a stuck state is diagnosed.
When the EGR valve 5 is diagnosed to be in a stuck state, the engine electronic control unit 1 makes a response plan, and in an afterward stage after the engine is shut down and powered off, the engine electronic control unit 1 continuously sends opening signals of 0% to 100% to the EGR valve 5 for three times, the opening signals are converted into driving signals PWM through the H-bridge circuit driving module 3, and then the H-bridge driving circuit 8 is controlled to drive the torque motor 6 in the EGR valve 5 to drive the EGR valve 5 to perform three times of actions.
After the response plan is completed and the engine is started next time, the engine electronic control unit 1 monitors the required position and the actual position of the EGR valve 5, when the actual position of the EGR valve 5 is consistent with the required position, the EGR valve 5 works normally at the moment, the clamping stagnation problem is solved, and when the required position of the EGR valve 5 is inconsistent with the actual position, the clamping stagnation problem is not solved.
At this time, if the demanded position of the EGR valve 5 is not consistent with the actual position, and the deviation value of the demanded position of the EGR valve 5 from the actual position is decreased compared to that before the response plan is implemented, and the decreased value is greater than the preset value, the response plan is repeated until the actual position of the EGR valve 5 is consistent with the demanded position or the deviation value of the demanded position of the EGR valve 5 from the actual position is decreased to be less than the preset value.
Example 8
A position sensor signal processing module 2, an H-bridge circuit driving module 3 and an EGR valve position closed-loop control module 4 are integrated in an engine electronic control unit 1, a torque motor 6 and a valve sheet opening position sensor 7 are arranged in an EGR valve 5, and the engine electronic control unit 1 controls the opening of the EGR valve 5 through an H-bridge driving circuit 8.
When the device for diagnosing and solving the jamming of the EGR valve 5 is used, under the normal work of an engine, the engine electronic control unit 1 sends an opening signal according to the required position of the EGR valve 5, the opening signal is converted into a driving signal PWM through the H-bridge circuit driving module 3, the H-bridge driving circuit 8 is further controlled to drive the torque motor 6 in the EGR valve 5, the EGR valve 5 is driven to act, the actual position signal of the EGR valve 5 is fed back to the engine electronic control unit 1 by the valve plate opening position sensor 7, the position sensor signal processing module 2 processes the actual position signal fed back by the valve plate opening position sensor 7 to obtain the actual position of the EGR valve 5, and the closed-loop control module 4 of the EGR valve position continues to perform closed-loop control according to the deviation between the required position and the actual position of the EGR valve 5 until the required position is consistent with the actual position. When the engine electronic control unit 1 monitors the required position and the actual position of the EGR valve 5, when the actual position of the EGR valve 5 coincides with the required position, the EGR valve 5 operates normally, and when the required position of the EGR valve 5 does not coincide with the actual position, a stuck state is diagnosed.
When the EGR valve 5 is diagnosed to be in a stuck state, the engine electronic control unit 1 makes a response plan, and in an afterward stage after the engine is shut down and powered off, the engine electronic control unit 1 continuously sends opening signals of 0% to 100% to the EGR valve 5 for three times, the opening signals are converted into driving signals PWM through the H-bridge circuit driving module 3, and then the H-bridge driving circuit 8 is controlled to drive the torque motor 6 in the EGR valve 5 to drive the EGR valve 5 to perform three times of actions.
After the response plan is completed and the engine is started next time, the engine electronic control unit 1 monitors the required position and the actual position of the EGR valve 5, when the actual position of the EGR valve 5 is consistent with the required position, the EGR valve 5 works normally at the moment, the clamping stagnation problem is solved, and when the required position of the EGR valve 5 is inconsistent with the actual position, the clamping stagnation problem is not solved.
At this time, if the required position of the EGR valve 5 is not consistent with the actual position, and the deviation value between the required position and the actual position of the EGR valve 5 is reduced compared with that before the response plan is implemented, and the reduced value is greater than the preset value, the response plan is repeated until the actual position of the EGR valve 5 is consistent with the required position or the deviation value between the required position and the actual position of the EGR valve 5 is reduced to be less than the preset value, and when the reduced value of the deviation value between the required position and the actual position of the EGR valve 5 is less than the preset value, the engine electronic control unit 1 alarms that the EGR valve 5 has a stuck fault, and prompts a customer to enter a 4S shop for maintenance treatment.
Example 9
A position sensor signal processing module 2, an H-bridge circuit driving module 3 and an EGR valve position closed-loop control module 4 are integrated in an engine electronic control unit 1, a torque motor 6 and a valve sheet opening position sensor 7 are arranged in an EGR valve 5, and the engine electronic control unit 1 controls the opening of the EGR valve 5 through an H-bridge driving circuit 8.
When the device for diagnosing and solving the jamming of the EGR valve 5 is used, under the normal work of an engine, the engine electronic control unit 1 sends an opening signal according to the required position of the EGR valve 5, the opening signal is converted into a driving signal PWM through the H-bridge circuit driving module 3, the H-bridge driving circuit 8 is further controlled to drive the torque motor 6 in the EGR valve 5, the EGR valve 5 is driven to act, the actual position signal of the EGR valve 5 is fed back to the engine electronic control unit 1 by the valve plate opening position sensor 7, the position sensor signal processing module 2 processes the actual position signal fed back by the valve plate opening position sensor 7 to obtain the actual position of the EGR valve 5, and the closed-loop control module 4 of the EGR valve position continues to perform closed-loop control according to the deviation between the required position and the actual position of the EGR valve 5 until the required position is consistent with the actual position. When the engine electronic control unit 1 monitors the required position and the actual position of the EGR valve 5, when the actual position of the EGR valve 5 coincides with the required position, the EGR valve 5 operates normally, and when the required position of the EGR valve 5 does not coincide with the actual position, a stuck state is diagnosed.
When the EGR valve 5 is diagnosed to be in a stuck state, the engine electronic control unit 1 makes a response plan, and in an afterward stage after the engine is shut down and powered off, the engine electronic control unit 1 continuously sends 0% to 100% opening degree signals for three times to the EGR valve 5, the opening degree signals are converted into driving signals PWM through the H-bridge circuit driving module 3, and then the H-bridge driving circuit 8 is controlled to drive the torque motor 6 in the EGR valve 5, so that the EGR valve 5 is driven to perform three times of actions, wherein the maximum current value is smaller than the current protection limit of the torque motor 6 when the engine electronic control unit 1 sends 0% to 100% opening degree signals to drive the torque motor 6 to operate.
After the response plan is completed and the engine is started next time, the engine electronic control unit 1 monitors the required position and the actual position of the EGR valve 5, when the actual position of the EGR valve 5 is consistent with the required position, the EGR valve 5 works normally at the moment, the clamping stagnation problem is solved, and when the required position of the EGR valve 5 is inconsistent with the actual position, the clamping stagnation problem is not solved.
At this time, if the required position of the EGR valve 5 is not consistent with the actual position, and the deviation value between the required position and the actual position of the EGR valve 5 is reduced compared with that before the response plan is implemented, and the reduced value is greater than the preset value, the response plan is repeated until the actual position of the EGR valve 5 is consistent with the required position or the deviation value between the required position and the actual position of the EGR valve 5 is reduced to be less than the preset value, and when the reduced value of the deviation value between the required position and the actual position of the EGR valve 5 is less than the preset value, the engine electronic control unit 1 alarms that the EGR valve 5 has a stuck fault, and prompts a customer to enter a 4S shop for maintenance treatment.
Example 10
A position sensor signal processing module 2, an H-bridge circuit driving module 3 and an EGR valve position closed-loop control module 4 are integrated in an engine electronic control unit 1, a torque motor 6 and a valve sheet opening position sensor 7 are arranged in an EGR valve 5, and the engine electronic control unit 1 controls the opening of the EGR valve 5 through an H-bridge driving circuit 8.
When the device for diagnosing and solving the jamming of the EGR valve 5 is used, under the normal work of an engine, the engine electronic control unit 1 sends an opening signal according to the required position of the EGR valve 5, the opening signal is converted into a driving signal PWM through the H-bridge circuit driving module 3, the H-bridge driving circuit 8 is further controlled to drive the torque motor 6 in the EGR valve 5, the EGR valve 5 is driven to act, the actual position signal of the EGR valve 5 is fed back to the engine electronic control unit 1 by the valve plate opening position sensor 7, the position sensor signal processing module 2 processes the actual position signal fed back by the valve plate opening position sensor 7 to obtain the actual position of the EGR valve 5, and the closed-loop control module 4 of the EGR valve position continues to perform closed-loop control according to the deviation between the required position and the actual position of the EGR valve 5 until the required position is consistent with the actual position. When the engine electronic control unit 1 monitors the required position and the actual position of the EGR valve 5, when the actual position of the EGR valve 5 coincides with the required position, the EGR valve 5 operates normally, and when the required position of the EGR valve 5 does not coincide with the actual position, a stuck state is diagnosed.
When the EGR valve 5 is diagnosed to be in a stuck state, the engine electronic control unit 1 makes a response plan, and in an afterward stage after the engine is shut down and powered off, the engine electronic control unit 1 continuously sends an opening degree signal of 0% to 100% to the EGR valve 5 for four times, the opening degree signal is converted into a driving signal PWM through the H-bridge circuit driving module 3, and then the H-bridge driving circuit 8 is controlled to drive the torque motor 6 in the EGR valve 5, and the EGR valve 5 is driven to perform four actions, wherein when the engine electronic control unit 1 sends the opening degree signal of 0% to 100% to drive the torque motor 6 to operate, the maximum current value is smaller than the current protection limit of the torque motor 6.
After the response plan is completed and the engine is started next time, the engine electronic control unit 1 monitors the required position and the actual position of the EGR valve 5, when the actual position of the EGR valve 5 is consistent with the required position, the EGR valve 5 works normally at the moment, the clamping stagnation problem is solved, and when the required position of the EGR valve 5 is inconsistent with the actual position, the clamping stagnation problem is not solved.
At this time, if the required position of the EGR valve 5 is not consistent with the actual position, and the deviation value between the required position and the actual position of the EGR valve 5 is reduced compared with that before the response plan is implemented, and the reduced value is greater than the preset value, the response plan is repeated until the actual position of the EGR valve 5 is consistent with the required position or the deviation value between the required position and the actual position of the EGR valve 5 is reduced to be less than the preset value, and when the reduced value of the deviation value between the required position and the actual position of the EGR valve 5 is less than the preset value, the engine electronic control unit 1 alarms that the EGR valve 5 has a stuck fault, and prompts a customer to enter a 4S shop for maintenance treatment.
In the above embodiment, by operating the EGR valve 5, firstly, slight clamping stagnation can be eliminated, so that the EGR valve 5 can be recovered to normal operation, and secondly, carbon deposits attached to the actuator can be cleaned by a large-scale action back and forth in a short time, so that the service life of the EGR valve 5 is prolonged.
According to the EGR valve 5 jamming diagnosis solving device and the using method thereof, whether the EGR valve 5 is jammed can be diagnosed by comparing the actual position of the EGR valve 5 with the required position; through the engine electric afterrun stage down, to the reciprocal quick action of EGR valve 5 execution, can eliminate EGR valve 5 jamming, clean oneself EGR valve 5, promote EGR valve 5's life, reduce user use cost.
Finally, it should be noted that the above is a detailed description of the invention, and the embodiments of the invention are not limited to the description, and those skilled in the art should be considered as falling within the protection scope of the present invention without departing from the spirit of the present invention. The above embodiments are merely representative examples of the present invention. It is obvious that the invention is not limited to the above-described embodiments, but that many variations are possible. Any simple modification, equivalent change and modification made to the above embodiments in accordance with the technical spirit of the present invention should be considered to be within the scope of the present invention.
Meanwhile, it should be noted that the above description of the technical solutions is exemplary, the present specification may be embodied in different forms, and should not be construed as being limited to the technical solutions set forth herein. Rather, these descriptions are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solution of the present invention is limited only by the scope of the claims. The features of the various embodiments of the present invention may be partially or fully combined or spliced with each other and performed in a variety of different configurations as would be well understood by those skilled in the art. Embodiments of the invention may be performed independently of each other or may be performed together in an interdependent relationship.
For those skilled in the art to which the invention relates, several simple deductions or substitutions may be made without departing from the spirit of the invention, and the above-mentioned structures should be considered as belonging to the protection scope of the invention.
Claims (10)
1. The utility model provides a diagnosis solution device of EGR valve jamming which characterized in that: the EGR valve control system is characterized in that a position sensor signal processing module (2), an H-bridge circuit driving module (3) and an EGR valve position closed-loop control module (4) are integrated in an engine electric control unit (1), a torque motor (6) and a valve sheet opening position sensor (7) are arranged inside an EGR valve (5), and the engine electric control unit (1) controls the opening of the EGR valve (5) through an H-bridge driving circuit (8).
2. A method of using the EGR valve stuck diagnostic resolving device of claim 1, wherein: under the normal work of an engine, the engine electric control unit (1) sends an opening signal according to the required position of the EGR valve (5), the opening signal is converted into a driving signal PWM through an H-bridge circuit driving module (3), and then an H-bridge driving circuit (8) is controlled to drive a torque motor (6) in the EGR valve (5) to drive the EGR valve (5) to act, an actual position signal of the EGR valve (5) is fed back to the engine electric control unit (1) by a valve plate opening position sensor (7), the actual position signal fed back by the valve plate opening position sensor (7) is processed by a position sensor signal processing module (2) to obtain the actual position of the EGR valve (5), and the EGR valve position closed-loop control module (4) continues to carry out closed-loop control according to the deviation between the required position and the actual position of the EGR valve (5), until the demanded position coincides with the actual position.
3. The use method of the EGR valve stuck diagnostic resolving device according to claim 2, characterized in that: when the engine works, the engine electronic control unit (1) monitors the required position and the actual position of the EGR valve (5), when the actual position of the EGR valve (5) is consistent with the required position, the EGR valve (5) works normally, and when the required position of the EGR valve (5) is inconsistent with the actual position, a clamping stagnation state is diagnosed.
4. The use of the EGR valve stuck diagnostic resolving device of claim 3, characterized in that: when EGR valve (5) diagnoses for the jamming state, engine electrical control unit (1) makes the response plan, and at the afteraft stage of engine flameout power-off, engine electrical control unit (1) sends 0% to 100% opening signal for a plurality of times in succession EGR valve (5), the opening signal passes through H bridge circuit drive module (3) and turns into drive signal PWM, and then control H bridge drive circuit (8) drive torque motor (6) in EGR valve (5), drive EGR valve (5) carry out the action of a plurality of times.
5. The use of the EGR valve stuck diagnostic resolving device of claim 4, wherein: after the response plan is completed and the engine is started next time, the engine electronic control unit (1) monitors the required position and the actual position of the EGR valve (5), when the actual position of the EGR valve (5) is consistent with the required position, the EGR valve (5) works normally at the moment, the clamping stagnation problem is solved, and when the required position of the EGR valve (5) is inconsistent with the actual position, the clamping stagnation problem is not solved.
6. The use of the EGR valve stuck diagnostic resolving device of claim 5, wherein: and if the required position of the EGR valve (5) is inconsistent with the actual position, the engine electronic control unit (1) alarms that the EGR valve (5) has a clamping stagnation fault and prompts a customer to enter a 4S shop for maintenance treatment.
7. The use of the EGR valve stuck diagnostic resolving device of claim 5, wherein: if the demanded position of the EGR valve (5) is not consistent with the actual position, and the deviation value of the demanded position of the EGR valve (5) and the actual position is reduced compared with that before the response plan is implemented, and the reduced value is larger than a preset value, the response plan is repeated until the actual position of the EGR valve (5) is consistent with the demanded position or the deviation value of the demanded position and the actual position of the EGR valve (5) is reduced to be smaller than the preset value.
8. The use of the EGR valve stuck diagnostic resolving device of claim 7, wherein: when the deviation value of the required position and the actual position of the EGR valve (5) is smaller than a preset value, the engine electronic control unit (1) alarms that the EGR valve (5) has a clamping stagnation fault and prompts a customer to enter a 4S shop for maintenance treatment.
9. The use of the EGR valve stuck diagnostic resolving device of claim 4, wherein: the number of times that the engine electronic control unit (1) continuously sends signals of 0% to 100% opening degree is not less than three times.
10. The use of the EGR valve stuck diagnostic resolving device of claim 4, wherein: when the engine electronic control unit (1) sends a 0% to 100% opening degree signal to drive the torque motor (6) to operate, the maximum current value is smaller than the current protection limit of the torque motor (6).
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Application publication date: 20220412 |