CN112682195A - Supercharger performance abnormity determination method and device - Google Patents
Supercharger performance abnormity determination method and device Download PDFInfo
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- CN112682195A CN112682195A CN202011549114.3A CN202011549114A CN112682195A CN 112682195 A CN112682195 A CN 112682195A CN 202011549114 A CN202011549114 A CN 202011549114A CN 112682195 A CN112682195 A CN 112682195A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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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
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Abstract
The invention discloses a method and a device for judging the performance abnormity of a supercharger, which can obtain a first air inlet pressure of an engine under a first working condition; determining whether the first intake pressure is within a preset allowable intake pressure range, and if not, closing the EGR valve; obtaining a second intake pressure of the engine under a second operating condition after the EGR valve is closed; and determining whether the performance of the supercharger in the vehicle is abnormal or not at least according to the second air inlet pressure and the preset calibrated air inlet pressure corresponding to the second working condition. The invention determines that the air inlet pressure of the engine is abnormal when the air inlet pressure of the engine under the current working condition is not within the preset allowable air inlet pressure range, closes the EGR valve, and then determines whether the performance of the supercharger is abnormal or not at least through the preset calibrated air inlet pressure corresponding to the working condition after closing the EGR valve and the air inlet pressure of the engine under the working condition, thereby being beneficial to a user to timely acquire and process the abnormal information of the supercharger.
Description
Technical Field
The invention relates to the technical field of correlation of engines, in particular to a supercharger performance abnormity judgment method and device.
Background
A supercharger is a device for increasing the intake pressure of a cylinder, and air entering the cylinder of an engine is compressed by the supercharger to increase the density of the air, so that more air is filled into the cylinder, thereby increasing the power of the engine.
In the use of present booster, when the bleed valve gassing of adjustment booster gassing pressure is not enough, will lead to the booster to overspeed, influences the stability of booster, if the aperture of this bleed valve is too big, will lead to the intake pressure of engine not enough, and then influences the performance of engine. Therefore, how to judge the abnormality of the supercharger in the engine in time and determine the abnormal type is beneficial to reducing the failure risk of the supercharger, facilitating the timely troubleshooting and ensuring the normal operation of the engine.
Disclosure of Invention
In view of the above problems, the present invention provides a method and an apparatus for determining a performance abnormality of a supercharger, which overcomes or at least partially solves the above problems, and the technical solution is as follows:
a supercharger performance abnormality determination method comprising:
obtaining a first air inlet pressure of an engine of a vehicle under a first working condition;
determining whether the first intake pressure is within a preset allowable intake pressure range, and if not, closing an EGR valve in an EGR system of the vehicle;
obtaining a second intake pressure of the engine at a second operating condition of the vehicle after closing the EGR valve;
and determining whether the performance of the supercharger in the vehicle is abnormal or not at least according to the second air inlet pressure and the preset calibrated air inlet pressure corresponding to the second working condition.
Optionally, after the determining the abnormal type of the supercharger in the vehicle, the method further comprises:
and executing a preset alarm strategy under the condition that the performance of the supercharger in the vehicle is determined to be abnormal.
Optionally, the determining whether the first intake pressure is within a preset allowable intake pressure range, and if not, closing an EGR valve in an EGR system of the vehicle includes:
and under the condition that the first intake pressure is determined to be higher than the upper limit of the preset allowable intake pressure range, determining whether the first intake pressure is higher than the corresponding preset allowable pressure maximum limit value under the first working condition, if so, executing a first preset protection strategy, and if not, closing an EGR valve in an EGR system of the vehicle.
Optionally, the determining whether the performance of the supercharger in the vehicle is abnormal according to at least the second intake pressure and a preset calibrated intake pressure corresponding to the second operating condition includes:
determining whether the performance of a supercharger in the vehicle is abnormal or not according to the second air inlet pressure and a preset calibrated air inlet pressure corresponding to the second working condition, and if not, obtaining the opening degree of an air release valve in the supercharger under the second working condition;
and determining whether the performance of the supercharger is abnormal or not according to the preset opening of the calibration bleed valve corresponding to the opening and the second working condition.
Optionally, the determining, according to the second intake pressure and a preset calibrated intake pressure corresponding to the second operating condition, whether performance of a supercharger in the vehicle is abnormal or not, and if not, obtaining an opening degree of a relief valve in the supercharger under the second operating condition includes:
determining whether the second intake pressure is equal to a preset calibrated intake pressure corresponding to the second working condition, if so, determining that an EGR system in the vehicle has a fault, if not, detecting whether the ambient temperature is abnormal, and if so, determining that the ambient temperature is abnormal;
and under the condition that the environment temperature is not detected to be abnormal, obtaining the first opening degree of a gas release valve in the supercharger under the second working condition.
Optionally, the determining whether the performance of the supercharger is abnormal according to the preset opening of the calibration bleed valve corresponding to the opening and the second operating condition includes:
under the condition that the first opening degree is equal to the preset calibrated bleed valve opening degree corresponding to the second working condition, determining that the performance of the supercharger is abnormal and the type of the abnormal performance is abnormal action of a bleed valve;
and under the condition that the first opening degree is smaller than the preset calibrated bleed valve opening degree corresponding to the second working condition, adjusting the bleed valve from the first opening degree to the preset calibrated bleed valve opening degree corresponding to the second working condition, if the adjustment is unsuccessful, determining that the performance of the supercharger is abnormal and the type of the performance abnormality is abnormal of an electric pressure regulating valve, if the adjustment is successful, taking a third intake pressure of the engine after the adjustment is successful as the second intake pressure, and returning to execute the step of determining whether the second intake pressure is equal to the preset calibrated intake pressure corresponding to the second working condition.
Optionally, the determining whether the first intake pressure is within a preset allowable intake pressure range, and if not, closing an EGR valve in an EGR system of the vehicle includes:
closing an EGR valve in an EGR system of the vehicle in the event that it is determined that the first intake pressure is below a lower limit of the preset allowable intake pressure range.
Optionally, the determining, according to the second intake pressure and a preset calibrated intake pressure corresponding to the second operating condition, whether performance of a supercharger in the vehicle is abnormal, and if the performance of the supercharger in the vehicle is not abnormal, obtaining an opening degree of a relief valve in the supercharger under the second operating condition includes:
determining whether the second intake pressure is equal to a preset calibrated intake pressure corresponding to the second working condition, if so, determining that an EGR system in the vehicle has a fault, if not, detecting whether the ambient temperature is abnormal, and if so, determining that the ambient temperature is abnormal;
and under the condition that the environment temperature is not detected to be abnormal, obtaining a second opening degree of a gas release valve in the supercharger under the second working condition.
Optionally, the determining whether the performance of the supercharger is abnormal according to the preset opening of the calibration bleed valve corresponding to the opening and the second operating condition includes:
under the condition that the second opening degree is equal to the preset calibrated bleed valve opening degree corresponding to the second working condition, determining that the performance of the supercharger is abnormal and the type of the abnormal performance is abnormal action of a bleed valve;
under the condition that the second opening degree is larger than the preset calibrated bleed valve opening degree corresponding to the second working condition, adjusting the bleed valve from the second opening degree to the preset calibrated bleed valve opening degree corresponding to the second working condition, if the adjustment is unsuccessful, determining that the performance of the supercharger is abnormal and the type of the performance abnormality is abnormal of an electric pressure regulating valve, if the adjustment is successful, taking the fourth intake pressure of the engine after the adjustment is successful as the second intake pressure, and returning to execute the step of determining whether the second intake pressure is equal to the preset calibrated intake pressure corresponding to the second working condition;
and under the condition that the second opening degree is smaller than the preset calibrated bleed valve opening degree corresponding to the second working condition, determining whether the second opening degree is smaller than a preset allowable minimum opening degree limit value corresponding to the second working condition, if so, executing a second preset protection strategy, and if not, determining that the performance of the supercharger is abnormal and the type of the performance abnormality is that the opening degree is abnormal and is smaller.
A supercharger performance abnormality determination device comprising: a first intake pressure obtaining unit, an intake pressure range deciding unit, an EGR valve closing unit, a second intake pressure obtaining unit, and an abnormality determining unit,
the first air inlet pressure obtaining unit is used for obtaining a first air inlet pressure of an engine of the vehicle under a first working condition;
the intake pressure range judging unit is used for determining whether the first intake pressure is within a preset allowable intake pressure range or not, and if not, the EGR valve closing unit is triggered;
the EGR valve closing unit is used for closing an EGR valve in an EGR system of the vehicle;
the second intake pressure obtaining unit is used for obtaining a second intake pressure of the engine under a second working condition of the vehicle after the EGR valve is closed;
and the abnormity determining unit is used for determining whether the performance of the supercharger in the vehicle is abnormal or not according to at least the second air inlet pressure and a preset calibration air inlet pressure corresponding to the second working condition.
By means of the technical scheme, the method and the device for judging the performance abnormity of the supercharger can obtain the first air inlet pressure of the engine under the first working condition; determining whether the first intake pressure is within a preset allowable intake pressure range, and if not, closing the EGR valve; obtaining a second intake pressure of the engine under a second operating condition after the EGR valve is closed; and determining whether the performance of the supercharger in the vehicle is abnormal or not at least according to the second air inlet pressure and the preset calibrated air inlet pressure corresponding to the second working condition. The invention determines the abnormal air inlet pressure of the engine when the air inlet pressure of the engine under the current working condition is not in the preset allowable air inlet pressure range, then closes the EGR valve to eliminate the influence of the EGR system on the air inlet pressure of the engine, and then determines whether the performance of the supercharger is abnormal or not at least through the preset calibrated air inlet pressure corresponding to the working condition after closing the EGR valve and the air inlet pressure of the engine under the working condition, thereby being beneficial to a user to timely acquire and process the abnormal information of the supercharger.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic flow chart illustrating a supercharger abnormality determination method according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating another supercharger abnormality determination method according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating another supercharger abnormality determination method according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating another supercharger abnormality determination method according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating another supercharger abnormality determination method according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating another supercharger abnormality determination method according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating another supercharger abnormality determination method according to the embodiment of the present invention;
fig. 8 is a schematic structural diagram illustrating a supercharger abnormality determination apparatus according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments 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.
As shown in fig. 1, a method for determining abnormality of a supercharger according to an embodiment of the present invention may include:
s100, obtaining a first air inlet pressure of an engine of the vehicle under a first working condition.
Operating conditions herein may include, among other things, the operating environment and operating parameters of the vehicle engine. For example: the operating conditions may include an ambient temperature of an operating environment of the vehicle engine, a speed parameter of the engine, and a torque parameter of the engine. The supercharger is an air compression device. The supercharger compresses air entering the engine cylinders so that more air is charged into the cylinders to increase the power of the engine. Alternatively, the supercharger may be embodied as a supercharger with an electronically controlled purge valve.
It will be appreciated that the supercharger in embodiments of the present invention may be an integral part of the engine or may be a vehicle component connected to the air intake of the engine. The performance of the supercharger directly affects the intake pressure of the engine.
It can be understood that the embodiment of the invention can monitor the intake pressure of the engine in real time to obtain the intake pressure of the engine in real time.
S200, determining whether the first air inlet pressure is within a preset allowable air inlet pressure range, and if not, executing the step S300.
The preset allowable intake pressure range can be comprehensively set according to the comprehensive emission, oil consumption and dynamic property of the vehicle. Optionally, the embodiment of the present invention may calibrate and store the normal intake pressure of the engine under each working condition, so as to determine the preset allowable intake pressure range. It is understood that the preset allowable intake air pressure range is a normal fluctuation range of the intake air pressure of the engine in a normal case. Optionally, in the embodiment of the present invention, the normal opening degree of the air release valve in the supercharger may also be calibrated and stored under various operating conditions.
For example: assuming that the preset allowable intake pressure range is: pLo～PHiWherein P isLoFor presetting the lower limit, P, of the allowable intake pressure rangeHiThe upper limit of the intake pressure range is preset, assuming that the first intake pressure is P1When P is presentHi≥P1≥PLoAnd if so, determining that the first air inlet pressure is within the preset allowable air inlet pressure range. When P is present1>PHiOr P1<PLoAnd if so, determining that the first air inlet pressure is not within the preset allowable air inlet pressure range.
It can be understood that, in the case that the first intake air pressure is within the preset allowable intake air pressure range, the embodiment of the invention can continue to monitor the intake air pressure of the engine.
According to the embodiment of the invention, under the condition that the first air inlet pressure of the engine is not in the preset allowable air inlet pressure range, the air inlet pressure of the engine can be preliminarily judged to be abnormal, so that the subsequent steps can be executed to determine the specific reason causing the air inlet pressure of the engine to be abnormal, and a user can conveniently and timely troubleshoot faults.
S300, closing an EGR valve in an EGR system of the vehicle.
Among them, the EGR (Exhaust Gas recirculation) system is a system in which a part of Exhaust Gas discharged from an engine in a vehicle is returned to an intake pipe of the engine and is fed into a cylinder again together with fresh air-fuel mixture. In order to avoid the EGR system from affecting the intake pressure of the engine, it is necessary to close an EGR valve in the EGR system in order to more accurately determine the specific cause of the intake pressure abnormality of the engine.
S400, obtaining a second intake pressure of the engine under a second working condition of the vehicle after the EGR valve is closed.
Since the intake pressure of the engine may change before and after the EGR valve is closed, the embodiment of the invention may obtain the second intake pressure of the engine after the EGR valve is closed, and determine the specific cause of the intake pressure abnormality of the engine according to the second intake pressure.
S500, determining whether the performance of the supercharger in the vehicle is abnormal or not according to at least the second air inlet pressure and the preset calibrated air inlet pressure corresponding to the second working condition.
It can be understood that the embodiment of the invention can calibrate and store the normal intake pressure of the engine under various working conditions in advance under the condition of closing the EGR valve. Further, the embodiment of the invention can set the normal intake pressure of the engine under each working condition as the calibration intake pressure in advance under the condition of closing the EGR valve.
Optionally, in the embodiment of the present invention, under the condition that the EGR valve is closed, the normal opening degree of the purge valve in the supercharger under each operating condition may be calibrated and stored in advance.
It is appreciated that one operating condition corresponds to a nominal intake pressure with the EGR valve closed. In practical applications, after the EGR valve is closed, the embodiment of the present invention may determine the preset calibrated intake pressure corresponding to the second operating condition according to the second operating condition after the EGR valve is closed. For example: when the EGR valve is closed, the working condition A corresponds to the calibrated intake pressure a, and the working condition B corresponds to the calibrated intake pressure B.
According to the method for judging the performance abnormity of the supercharger, the first air inlet pressure of the engine under the first working condition can be obtained; determining whether the first intake pressure is within a preset allowable intake pressure range, and if not, closing the EGR valve; obtaining a second intake pressure of the engine under a second operating condition after the EGR valve is closed; and determining whether the performance of the supercharger in the vehicle is abnormal or not at least according to the second air inlet pressure and the preset calibrated air inlet pressure corresponding to the second working condition. The invention determines the abnormal air inlet pressure of the engine when the air inlet pressure of the engine under the current working condition is not in the preset allowable air inlet pressure range, then closes the EGR valve to eliminate the influence of the EGR system on the air inlet pressure of the engine, and then determines whether the performance of the supercharger is abnormal or not at least through the preset calibrated air inlet pressure corresponding to the working condition after closing the EGR valve and the air inlet pressure of the engine under the working condition, thereby being beneficial to a user to timely acquire and process the abnormal information of the supercharger.
Optionally, based on the method shown in fig. 1, as shown in fig. 2, in another method for determining an abnormality of a supercharger according to an embodiment of the present invention, step S500 may include:
and S510, determining whether the performance of the supercharger in the vehicle is abnormal according to the second air inlet pressure and the preset calibrated air inlet pressure corresponding to the second working condition, and if not, executing the step S520.
And S520, obtaining the opening degree of a gas release valve in the supercharger under the second working condition.
S530, determining whether the performance of the supercharger is abnormal according to the preset opening of the calibration bleed valve corresponding to the opening and the second working condition.
It can be understood that the opening of the air release valve in the supercharger directly affects the intake pressure of the engine. In the case that whether the supercharger is abnormal cannot be determined directly through the intake pressure of the engine, the embodiment of the invention may determine whether the intake pressure of the engine is abnormal due to the performance abnormality of the supercharger by combining the opening degree of the exhaust valve in the supercharger under the second operating condition of closing the EGR valve.
Alternatively, based on the method shown in fig. 2, as shown in fig. 3, in another method for determining an abnormality of a supercharger according to an embodiment of the present invention, step S200 may include:
s210, under the condition that the first intake pressure is determined to be higher than the upper limit of the preset allowable intake pressure range, determining whether the first intake pressure is higher than the corresponding preset allowable pressure maximum limit value under the first working condition, if so, executing the step S220, and if not, executing the step S300.
S220, executing a first preset protection strategy.
It is to be noted that the preset allowable maximum pressure value may not be the upper limit of the preset allowable intake pressure range. Under normal circumstances, the preset allowable maximum pressure value is larger than the upper limit of the preset allowable intake pressure range. According to the embodiment of the invention, the corresponding intake pressure value of the engine under the allowable rotating speed of the supercharger under each working condition can be determined according to the allowable rotating speed of the supercharger under each working condition, and the intake pressure value is used as the maximum limit value of the preset allowable pressure. Each operating mode corresponds to a preset maximum allowable pressure limit. The embodiment of the invention can calibrate and store the corresponding preset allowable pressure maximum limit value under each working condition.
When the intake pressure of the engine is higher than the maximum value of the preset allowable pressure, it is indicated that serious abnormality occurs in the intake pressure of the engine, and the serious abnormality may cause the vehicle to be incapable of continuing normal running and easily cause danger to personnel in the vehicle.
Optionally, the first preset protection policy may include: the torque and the rotating speed of the engine are reduced, the fault lamp of the vehicle is controlled to flash, and the abnormity of the intake pressure is prompted.
Alternatively, based on the method shown in fig. 3, as shown in fig. 4, in another method for determining an abnormality of a supercharger according to an embodiment of the present invention, step S510 may include:
and S511, determining whether the second intake pressure is equal to a preset calibrated intake pressure corresponding to the second working condition, if so, executing the step S512, and if not, executing the step S513.
S512, determining the EGR system fault in the vehicle.
When the second intake pressure is equal to the preset calibrated intake pressure corresponding to the second working condition, the intake pressure of the engine returns to normal under the condition that the EGR valve is closed, so that the reason that the intake pressure of the engine is abnormal can be determined to be the failure of the EGR system. Optionally, the embodiment of the invention may prompt the EGR system fault information when determining that the EGR system is faulty.
S513, whether the environment temperature is abnormal or not is detected, if the environment temperature is abnormal, the step S514 is executed, and if the environment temperature is not abnormal, the step S521 is executed.
And S514, determining that the ambient temperature is abnormal.
Specifically, the embodiment of the invention can measure the temperature value of the intake air through the intake air temperature sensor in the engine to determine whether the intake air pressure of the engine is abnormal due to the abnormal ambient temperature. Optionally, in the embodiment of the present invention, when it is determined that the ambient temperature is abnormal, the fault lamp may be controlled to flash, and information of the abnormal ambient temperature may be prompted.
And S521, acquiring a first opening degree of a vent valve in the supercharger under the second working condition.
According to the embodiment of the invention, after the intake pressure abnormity of the engine caused by the EGR system fault and the environment temperature abnormity is eliminated, the performance abnormity of the supercharger can be preliminarily determined. Further, the embodiment of the invention can determine whether the intake pressure of the engine is abnormal and the type of the performance abnormality of the supercharger, which are finally caused by the performance abnormality of the supercharger, through the opening degree of the purge valve of the supercharger.
Alternatively, as in the method shown in fig. 4, step S530 may include:
and S531, under the condition that the first opening degree is equal to the preset calibrated bleed valve opening degree corresponding to the second working condition, determining that the performance of the supercharger is abnormal and the type of the abnormal performance is abnormal operation of the bleed valve.
The pressure increasing valve mainly comprises an electric control pressure regulating valve and a deflation valve. When the air quantity passes through the electric control pressure regulating valve, the air release valve is pushed to operate, and through the opening degrees of different electric control pressure regulating valves, the air quantity for pushing the air release valve is controlled to be different when the opening degrees of the electric control pressure regulating valves are different, so that the air quantity discharged by the air release valve is different, and finally the air inlet pressure of the engine is different.
Under the condition that the first opening degree is equal to the preset calibrated bleed valve opening degree corresponding to the second working condition, the condition that the air quantity for pushing the bleed valve is normal is indicated, but the second air inlet pressure of the engine is still larger than the preset calibrated air inlet pressure corresponding to the second working condition, and the condition that the gas needing to be exhausted through the bleed valve is not normally exhausted is indicated, so that the type of the performance abnormity of the supercharger can be determined to be the abnormal action of the bleed valve.
S532, under the condition that the first opening degree is smaller than the preset calibrated deflation valve opening degree corresponding to the second working condition, adjusting the deflation valve from the first opening degree to the preset calibrated deflation valve opening degree corresponding to the second working condition, if the adjustment is not successful, executing the step S533, and if the adjustment is successful, executing the step S534.
And S533, determining that the performance of the supercharger is abnormal and the type of the performance abnormality is the abnormality of the electric pressure regulating valve.
The air quantity for pushing the air release valve is determined by the opening degree of the electric pressure regulating valve, and the air quantity for pushing the air release valve directly influences the opening degree of the air release valve. Therefore, in the case where the adjustment of the purge valve opening degree is unsuccessful, it can be determined that the performance of the supercharger is abnormal and the type of the performance abnormality is the electric pressure regulating valve abnormality.
And S534, taking the third air inlet pressure of the engine after the adjustment is successful as the second air inlet pressure, and returning to the step S511.
According to the embodiment of the invention, under the condition that the first intake pressure is higher than the upper limit of the preset allowable intake pressure range and is not higher than the corresponding preset allowable pressure maximum limit under the first working condition, whether the intake pressure of the engine is abnormal caused by EGR system faults and environmental temperature abnormity is determined through the second intake pressure and the preset calibrated intake pressure corresponding to the second working condition, and the type of performance abnormity of the supercharger is further determined through the opening degree of the deflation valve of the supercharger, so that the reason of the intake pressure abnormity of the engine can be determined, and related technicians can conveniently investigate and solve related faults.
Alternatively, based on the method shown in fig. 2, as shown in fig. 5, in another method for determining an abnormality of a supercharger according to an embodiment of the present invention, step S200 may include:
and S230, executing the step S300 under the condition that the first air inlet pressure is lower than the lower limit of the preset allowable air inlet pressure range.
Alternatively, based on the method shown in fig. 5, as shown in fig. 6, in another method for determining an abnormality of a supercharger according to the embodiment of the present invention, step S510 may include:
and S515, determining whether the second intake pressure is equal to a preset calibrated intake pressure corresponding to the second working condition, if so, executing the step S516, and if not, executing the step S517.
And S516, determining the EGR system fault in the vehicle.
The descriptions of step S515 to step S516 can refer to the above steps S511 to S512, which are not described herein again.
And S517, detecting whether the environment temperature is abnormal or not, if so, executing the step S518, and if not, executing the step S522.
S518, determining that the ambient temperature is abnormal.
The descriptions of step S517 to step S518 refer to the above steps S513 to S514, which are not described herein again.
And S522, acquiring a second opening degree of a relief valve in the supercharger under the second working condition.
Alternatively, as in the method shown in fig. 6, step S530 may include:
and S535, under the condition that the second opening degree is equal to the preset calibrated bleed valve opening degree corresponding to the second working condition, determining that the performance of the supercharger is abnormal and the type of the abnormal performance is abnormal action of the bleed valve.
The principle of step S535 is similar to that of step S531, and reference may be made to the description of step S531, which is not repeated here.
And S536, when the second opening degree is larger than the preset calibrated deflation valve opening degree corresponding to the second working condition, adjusting the deflation valve from the second opening degree to the preset calibrated deflation valve opening degree corresponding to the second working condition, if the adjustment is not successful, executing step S537, and if the adjustment is successful, executing step S538.
And S537, determining that the performance of the supercharger is abnormal and the type of the performance abnormality is abnormal of the electric pressure regulating valve.
The description of step S537 can refer to step S533 described above, and is not repeated here.
And S538, taking the fourth intake pressure of the engine after the adjustment is successful as the second intake pressure, and returning to the step S515.
S539, under the condition that the second opening degree is smaller than the preset calibrated deflation valve opening degree corresponding to the second working condition, determining whether the second opening degree is smaller than a preset allowable minimum opening degree limit value corresponding to the second working condition, if so, executing a step S540, and if not, executing a step S541.
The opening degree of the lower air valve is obtained as the preset minimum opening degree limit value through the calibration of the rack by combining the allowable rotating speed limit value of the supercharger under each working condition. Each operating mode corresponds to a preset minimum allowable opening limit. The embodiment of the invention can calibrate and store the corresponding preset allowable minimum opening limit value under each working condition.
And S540, executing a second preset protection strategy.
Optionally, the second preset protection policy may be the same as the first preset protection policy.
When the opening degree of the purge valve of the supercharger is smaller than the preset allowable minimum opening degree limit value, it is indicated that the performance of the supercharger is seriously abnormal, which may cause insufficient intake pressure of the engine, seriously affect the performance of the engine, and easily cause danger to personnel in the vehicle.
S541, determining that the performance of the supercharger is abnormal and the type of the performance abnormality is that the opening degree is abnormal to be smaller.
In the actual use process, because the engine of vehicle adopts closed circulation's mode for oil gas gets into the booster again after oil and gas separator separates in the engine, and reasons such as the longer or service environment of booster live time cause easily that the booster internal component has more fatlute, and then lead to the aperture of the bleed valve of booster unusually little.
Optionally, based on the method shown in fig. 1, as shown in fig. 7, in another method for determining an abnormality of a supercharger according to an embodiment of the present invention, after step S500, the method further includes:
s600, executing a preset alarm strategy under the condition that the performance of the supercharger in the vehicle is determined to be abnormal.
Optionally, in the embodiment of the present invention, the first preset alarm strategy may be executed when it is determined that the type of the performance abnormality of the supercharger is an abnormality in the operation of the purge valve. Optionally, the first preset alarm policy may include: and prompting the information of abnormal action of the air release valve. According to the embodiment of the invention, related personnel can be timely reminded to check the air release valve of the supercharger through the first preset alarm strategy.
Optionally, the embodiment of the present invention may execute the second preset alarm strategy when it is determined that the type of the performance abnormality of the supercharger is an electric pressure regulating valve abnormality. Optionally, the second preset alarm policy may include: and prompting the information of abnormal action of the electric pressure regulating valve. According to the embodiment of the invention, related personnel can be timely reminded to check the electric pressure regulating valve of the supercharger through the second preset alarm strategy.
Optionally, in the embodiment of the present invention, a third preset alarm policy may be executed when it is determined that the type of performance abnormality of the supercharger is that the opening degree is abnormally small. Optionally, the third preset alarm policy may include: and prompting the information that the opening degree of the supercharger is smaller than the abnormal value. According to the embodiment of the invention, related personnel can be reminded to check the supercharger and timely treat the oil sludge in the supercharger by the third preset alarm strategy.
Corresponding to the above method embodiment, an embodiment of the present invention further provides a supercharger performance abnormality determination apparatus, whose structure is shown in fig. 8, and may include: a first intake pressure obtaining unit 100, an intake pressure range deciding unit 200, an EGR valve closing unit 300, a second intake pressure obtaining unit 400, and an abnormality type determining unit 500.
The first intake pressure obtaining unit 100 obtains a first intake pressure of an engine of the vehicle under a first working condition.
The intake pressure range decision unit 200 determines whether the first intake pressure is within a preset allowable intake pressure range, and if not, triggers the EGR valve closing unit 300.
The EGR valve closing unit 300 is configured to close an EGR valve in an EGR system of the vehicle.
The second intake pressure obtaining unit 400 is configured to obtain a second intake pressure of the engine under a second operating condition of the vehicle after the EGR valve is closed.
And the abnormity determining unit is used for determining whether the performance of the supercharger in the vehicle is abnormal or not according to at least the second air inlet pressure and a preset calibration air inlet pressure corresponding to the second working condition.
Optionally, another supercharger performance abnormality determination apparatus provided in the embodiment of the present invention may further include: and an alarm strategy execution unit.
And the alarm strategy execution unit is used for executing a preset alarm strategy under the condition that the abnormality determination unit determines that the performance of the supercharger in the vehicle is abnormal.
Alternatively, the intake pressure range decision unit 200 may include: a first decision subunit and a first protection policy enforcement subunit.
And a first judging subunit, configured to, in a case where it is determined that the first intake pressure is higher than the upper limit of the preset allowable intake pressure range, determine whether the first intake pressure is higher than a corresponding preset allowable pressure maximum limit value under the first operating condition, if so, trigger the first protection strategy executing subunit, and if not, trigger the EGR valve closing unit 300 to close the EGR valve in the EGR system of the vehicle.
A first protection strategy execution subunit for executing a first preset protection strategy
Optionally, the abnormality determination unit includes a first abnormality determination subunit, a purge valve opening degree obtaining subunit, and a second abnormality determination subunit.
And the first abnormity determining subunit is used for determining whether the performance of the supercharger in the vehicle is abnormal according to the second air inlet pressure and a preset calibrated air inlet pressure corresponding to the second working condition, and if the performance of the supercharger in the vehicle is not abnormal, triggering the air bleed valve opening obtaining subunit.
And the air bleeding valve opening obtaining subunit is used for obtaining the opening of an air bleeding valve in the supercharger under the second working condition.
And the second abnormity determining subunit is used for determining whether the performance of the supercharger is abnormal according to the preset opening of the calibrated bleed valve, wherein the opening corresponds to the second working condition.
Optionally, the first abnormality determining subunit is specifically configured to determine whether the second intake pressure is equal to a preset calibrated intake pressure corresponding to the second operating condition, if so, determine that an EGR system in the vehicle is faulty, if not, detect whether an ambient temperature is abnormal, if so, determine that the ambient temperature is abnormal, and if not, trigger the bleed valve opening obtaining subunit to specifically obtain the first opening of the bleed valve in the supercharger under the second operating condition.
Optionally, the second abnormality determining subunit may be specifically configured to determine that the performance of the supercharger is abnormal and the type of the abnormal performance is that the purge valve is abnormal in operation when the first opening degree is equal to a preset calibrated purge valve opening degree corresponding to the second operating condition;
optionally, the second abnormality determining sub-unit may be further specifically configured to, when the first opening degree is smaller than a preset calibrated bleed valve opening degree corresponding to the second operating condition, adjust the bleed valve from the first opening degree to the preset calibrated bleed valve opening degree corresponding to the second operating condition, if the adjustment is unsuccessful, determine that the performance of the supercharger is abnormal and the type of the performance abnormality is that the electric pressure regulating valve is abnormal, and if the adjustment is successful, use a third intake pressure of the engine after the adjustment is successful as the second intake pressure, and trigger the first abnormality determining sub-unit to determine whether the second intake pressure is equal to the preset calibrated intake pressure corresponding to the second operating condition.
Optionally, the EGR valve closing unit 300 is further configured to close an EGR valve in an EGR system of the vehicle if the intake pressure range decision unit 200 determines that the first intake pressure is lower than the lower limit of the preset allowable intake pressure range.
Optionally, the first abnormality determining subunit is specifically configured to determine whether the second intake pressure is equal to a preset calibrated intake pressure corresponding to the second operating condition, if so, determine that an EGR system in the vehicle is faulty, if not, detect whether an ambient temperature is abnormal, if so, determine that the ambient temperature is abnormal, and if not, trigger the air bleeding valve opening obtaining subunit to specifically obtain a second opening of the air bleeding valve in the supercharger under the second operating condition.
Optionally, the second abnormality determining subunit may be specifically configured to determine that the performance of the supercharger is abnormal and the type of the performance abnormality is that the purge valve is abnormal when the second opening degree is equal to a preset calibrated purge valve opening degree corresponding to the second operating condition.
Optionally, the second abnormality determining sub-unit may be further specifically configured to, when the second opening degree is greater than a preset calibrated bleed valve opening degree corresponding to the second operating condition, adjust the bleed valve from the second opening degree to the preset calibrated bleed valve opening degree corresponding to the second operating condition, if the adjustment is unsuccessful, determine that the performance of the supercharger is abnormal and the type of the performance abnormality is that the electric pressure regulating valve is abnormal, and if the adjustment is successful, use a fourth intake pressure of the engine after the adjustment is successful as the second intake pressure, and trigger the first abnormality determining sub-unit to determine whether the second intake pressure is equal to the preset calibrated intake pressure corresponding to the second operating condition.
Optionally, the second abnormality determining subunit may be further specifically configured to determine, when the second opening degree is smaller than a preset calibrated bleed valve opening degree corresponding to the second operating condition, whether the second opening degree is smaller than a preset allowable minimum opening degree limit corresponding to the second operating condition, if the second opening degree is smaller than the preset allowable minimum opening degree limit, execute a second preset protection strategy, and if the second opening degree is not smaller than the preset allowable minimum opening degree limit, determine that the performance of the supercharger is abnormal and the type of the performance abnormality is that the opening degree is abnormal and is smaller.
The supercharger performance abnormity determining device can obtain a first air inlet pressure of an engine under a first working condition; determining whether the first intake pressure is within a preset allowable intake pressure range, and if not, closing the EGR valve; obtaining a second intake pressure of the engine under a second operating condition after the EGR valve is closed; and determining whether the performance of the supercharger in the vehicle is abnormal or not at least according to the second air inlet pressure and the preset calibrated air inlet pressure corresponding to the second working condition. The invention determines the abnormal air inlet pressure of the engine when the air inlet pressure of the engine under the current working condition is not in the preset allowable air inlet pressure range, then closes the EGR valve to eliminate the influence of the EGR system on the air inlet pressure of the engine, and then determines whether the performance of the supercharger is abnormal or not at least through the preset calibrated air inlet pressure corresponding to the working condition after closing the EGR valve and the air inlet pressure of the engine under the working condition, thereby being beneficial to a user to timely acquire and process the abnormal information of the supercharger.
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 phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. 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 invention. Thus, the present invention 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.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. A supercharger performance abnormality determination method characterized by comprising:
obtaining a first air inlet pressure of an engine of a vehicle under a first working condition;
determining whether the first intake pressure is within a preset allowable intake pressure range, and if not, closing an EGR valve in an EGR system of the vehicle;
obtaining a second intake pressure of the engine at a second operating condition of the vehicle after closing the EGR valve;
and determining whether the performance of the supercharger in the vehicle is abnormal or not at least according to the second air inlet pressure and the preset calibrated air inlet pressure corresponding to the second working condition.
2. The method of claim 1, wherein after the determining the type of abnormality of the supercharger in the vehicle, the method further comprises:
and executing a preset alarm strategy under the condition that the performance of the supercharger in the vehicle is determined to be abnormal.
3. The method of claim 1, wherein the determining whether the first intake pressure is within a preset allowable intake pressure range, and if not, closing an EGR valve in an EGR system of the vehicle comprises:
and under the condition that the first intake pressure is determined to be higher than the upper limit of the preset allowable intake pressure range, determining whether the first intake pressure is higher than the corresponding preset allowable pressure maximum limit value under the first working condition, if so, executing a first preset protection strategy, and if not, closing an EGR valve in an EGR system of the vehicle.
4. A method according to any one of claims 1-3, wherein said determining whether performance of a supercharger in the vehicle is abnormal based on at least the second intake air pressure and a preset calibrated intake air pressure corresponding to the second operating condition comprises:
determining whether the performance of a supercharger in the vehicle is abnormal or not according to the second air inlet pressure and a preset calibrated air inlet pressure corresponding to the second working condition, and if not, obtaining the opening degree of an air release valve in the supercharger under the second working condition;
and determining whether the performance of the supercharger is abnormal or not according to the preset opening of the calibration bleed valve corresponding to the opening and the second working condition.
5. The method according to claim 4, wherein the step of judging whether the performance of the supercharger in the vehicle can be determined to be abnormal or not according to the second intake pressure and the preset calibration intake pressure corresponding to the second working condition, and if the performance of the supercharger in the vehicle is not abnormal, the step of obtaining the opening degree of the air release valve in the supercharger under the second working condition comprises the following steps:
determining whether the second intake pressure is equal to a preset calibrated intake pressure corresponding to the second working condition, if so, determining that an EGR system in the vehicle has a fault, if not, detecting whether the ambient temperature is abnormal, and if so, determining that the ambient temperature is abnormal;
and under the condition that the environment temperature is not detected to be abnormal, obtaining the first opening degree of a gas release valve in the supercharger under the second working condition.
6. The method of claim 5, wherein determining whether performance of the supercharger is abnormal based on a preset calibrated bleed valve opening corresponding to the second operating condition comprises:
under the condition that the first opening degree is equal to the preset calibrated bleed valve opening degree corresponding to the second working condition, determining that the performance of the supercharger is abnormal and the type of the abnormal performance is abnormal action of a bleed valve;
and under the condition that the first opening degree is smaller than the preset calibrated bleed valve opening degree corresponding to the second working condition, adjusting the bleed valve from the first opening degree to the preset calibrated bleed valve opening degree corresponding to the second working condition, if the adjustment is unsuccessful, determining that the performance of the supercharger is abnormal and the type of the performance abnormality is abnormal of an electric pressure regulating valve, if the adjustment is successful, taking a third intake pressure of the engine after the adjustment is successful as the second intake pressure, and returning to execute the step of determining whether the second intake pressure is equal to the preset calibrated intake pressure corresponding to the second working condition.
7. The method of claim 4, wherein the determining whether the first intake pressure is within a preset allowable intake pressure range, and if not, closing an EGR valve in an EGR system of the vehicle comprises:
closing an EGR valve in an EGR system of the vehicle in the event that it is determined that the first intake pressure is below a lower limit of the preset allowable intake pressure range.
8. The method according to claim 7, wherein the step of determining whether the performance of a supercharger in the vehicle is abnormal according to the second intake pressure and a preset calibration intake pressure corresponding to the second working condition, and if the performance of the supercharger in the vehicle is not abnormal, obtaining the opening degree of a relief valve in the supercharger under the second working condition comprises the following steps:
determining whether the second intake pressure is equal to a preset calibrated intake pressure corresponding to the second working condition, if so, determining that an EGR system in the vehicle has a fault, if not, detecting whether the ambient temperature is abnormal, and if so, determining that the ambient temperature is abnormal;
and under the condition that the environment temperature is not detected to be abnormal, obtaining a second opening degree of a gas release valve in the supercharger under the second working condition.
9. The method of claim 8, wherein determining whether the performance of the supercharger is abnormal based on the preset calibrated bleed valve opening corresponding to the second operating condition comprises:
under the condition that the second opening degree is equal to the preset calibrated bleed valve opening degree corresponding to the second working condition, determining that the performance of the supercharger is abnormal and the type of the abnormal performance is abnormal action of a bleed valve;
under the condition that the second opening degree is larger than the preset calibrated bleed valve opening degree corresponding to the second working condition, adjusting the bleed valve from the second opening degree to the preset calibrated bleed valve opening degree corresponding to the second working condition, if the adjustment is unsuccessful, determining that the performance of the supercharger is abnormal and the type of the performance abnormality is abnormal of an electric pressure regulating valve, if the adjustment is successful, taking the fourth intake pressure of the engine after the adjustment is successful as the second intake pressure, and returning to execute the step of determining whether the second intake pressure is equal to the preset calibrated intake pressure corresponding to the second working condition;
and under the condition that the second opening degree is smaller than the preset calibrated bleed valve opening degree corresponding to the second working condition, determining whether the second opening degree is smaller than a preset allowable minimum opening degree limit value corresponding to the second working condition, if so, executing a second preset protection strategy, and if not, determining that the performance of the supercharger is abnormal and the type of the performance abnormality is that the opening degree is abnormal and is smaller.
10. A supercharger performance abnormality determination device characterized by comprising: a first intake pressure obtaining unit, an intake pressure range deciding unit, an EGR valve closing unit, a second intake pressure obtaining unit, and an abnormality determining unit,
the first air inlet pressure obtaining unit is used for obtaining a first air inlet pressure of an engine of the vehicle under a first working condition;
the intake pressure range judging unit is used for determining whether the first intake pressure is within a preset allowable intake pressure range or not, and if not, the EGR valve closing unit is triggered;
the EGR valve closing unit is used for closing an EGR valve in an EGR system of the vehicle;
the second intake pressure obtaining unit is used for obtaining a second intake pressure of the engine under a second working condition of the vehicle after the EGR valve is closed;
and the abnormity determining unit is used for determining whether the performance of the supercharger in the vehicle is abnormal or not according to at least the second air inlet pressure and a preset calibration air inlet pressure corresponding to the second working condition.
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