CN112065983B - Method, device and equipment for detecting abnormal fault of clutch pressure and storage medium - Google Patents
Method, device and equipment for detecting abnormal fault of clutch pressure and storage medium Download PDFInfo
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- CN112065983B CN112065983B CN202010847446.3A CN202010847446A CN112065983B CN 112065983 B CN112065983 B CN 112065983B CN 202010847446 A CN202010847446 A CN 202010847446A CN 112065983 B CN112065983 B CN 112065983B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/02—Selector apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
- F16H2061/1256—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
- F16H2061/1276—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is a friction device, e.g. clutches or brakes
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
The invention relates to the technical field of automobiles, and discloses a method, a device, equipment and a storage medium for detecting abnormal pressure fault of a clutch, wherein the method comprises the following steps: acquiring current vehicle information and an actual clutch pressure value of a target vehicle; determining the current vehicle running condition of the target vehicle according to the current vehicle information; searching a target clutch pressure value corresponding to the current vehicle running condition; and judging whether the clutch pressure of the target vehicle is abnormal or not according to the actual clutch pressure value and the target clutch pressure value. The current vehicle running condition is determined according to the current vehicle information, the target clutch pressure value corresponding to the current vehicle running condition is searched, whether the clutch pressure is abnormal or not is judged according to the actual clutch pressure value and the target clutch pressure value, the defect that the clutch pressure is difficult to detect abnormally is overcome, and the effect of detecting the abnormal fault of the clutch pressure is improved.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a method, a device, equipment and a storage medium for detecting abnormal clutch pressure faults.
Background
The DTC dual-clutch transmission is a popular technology in recent years, and a wet dual-clutch DTC transmission is one of the DTC dual-clutch transmissions, and adopts two groups of multi-plate wet clutches, double input shafts, double output shafts and an automatic gear shifting program to realize gear shifting with quick impact. During the operation of the wet double-clutch DTC transmission, the situation that the circuit is not broken down but the clutch pressure is abnormal can exist, and the normal operation of a vehicle is influenced.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a method, a device, equipment and a storage medium for detecting abnormal faults of clutch pressure, and aims to solve the technical problem that the abnormal detection of the clutch pressure is difficult in the prior art.
In order to achieve the above object, the present invention provides a method for detecting a clutch pressure abnormality fault, wherein a transmission gear selecting and shifting system comprises: the method for detecting the abnormal fault of the clutch pressure comprises the following steps:
acquiring current vehicle information and an actual clutch pressure value of a target vehicle;
determining the current vehicle running condition of the target vehicle according to the current vehicle information;
searching a target clutch pressure value corresponding to the current vehicle running condition;
and judging whether the clutch pressure of the target vehicle is abnormal or not according to the actual clutch pressure value and the target clutch pressure value.
Optionally, the determining whether the clutch pressure of the target vehicle is abnormal according to the actual clutch pressure value and the target clutch pressure value includes:
obtaining a clutch pressure difference value according to the actual clutch pressure value and the target clutch pressure value;
detecting the duration of a pressure difference value corresponding to the clutch pressure difference value, and calculating the absolute value of the pressure difference value of the clutch pressure difference value;
and judging whether the clutch pressure of the target vehicle is abnormal or not according to the absolute value of the pressure difference value and the duration time of the pressure difference value.
Optionally, comparing the absolute value of the pressure difference with a preset pressure difference threshold to obtain a pressure comparison result;
comparing the pressure difference duration with a preset pressure time threshold to obtain a time comparison result;
and judging whether the clutch pressure of the target vehicle is abnormal or not according to the pressure comparison result and the time comparison result.
Optionally, after determining whether the clutch pressure of the target vehicle is abnormal according to the pressure comparison result and the time comparison result, the method further includes:
and when the pressure comparison result is that the absolute value of the pressure difference is larger than the preset pressure difference threshold value, and the time comparison result is that the duration of the pressure difference is larger than the preset pressure time threshold value, determining that the clutch pressure of the target vehicle is abnormal.
Optionally, after determining whether the clutch pressure of the target vehicle is abnormal according to the actual clutch pressure value and the target clutch pressure value, the method further includes:
when the clutch pressure of the target vehicle is abnormal, acquiring an actual engine torque value of the target vehicle, and searching a target engine torque value corresponding to the current vehicle running condition;
obtaining an engine torque difference value according to the actual engine torque value and the target engine torque value;
detecting the torque difference value duration corresponding to the engine torque difference value, and calculating the torque difference value absolute value of the engine torque difference value;
and when the absolute value of the torque difference is smaller than a preset torque difference threshold value and the duration of the torque difference is smaller than a preset torque time threshold value, judging that the clutch pressure sensor has a fault.
Optionally, after detecting a torque difference duration of the engine torque difference and calculating a torque difference absolute value of the engine torque difference, the method further includes:
and when the absolute value of the torque difference is larger than a preset torque difference threshold, the duration time of the torque difference is larger than a preset torque time threshold, and the actual engine torque value is larger than the target engine torque value, determining that the clutch pressure control valve is blocked.
Optionally, after detecting a torque difference duration of the engine torque difference and calculating a torque difference absolute value of the engine torque difference, the method further includes:
and when the absolute value of the torque difference is larger than a preset torque difference threshold, the duration time of the torque difference is larger than a preset torque time threshold, and the actual engine torque value is smaller than the target engine torque value, judging that the oil quantity of the transmission is insufficient.
In order to achieve the above object, the present invention also provides a clutch pressure abnormality fault detection device including:
the information acquisition module is used for acquiring current vehicle information and an actual clutch pressure value of a target vehicle;
the working condition determining module is used for determining the current vehicle running working condition of the target vehicle according to the current vehicle information;
the information searching module is used for searching a target clutch pressure value corresponding to the current vehicle running condition;
and the abnormity judgment module is used for judging whether the clutch pressure of the target vehicle is abnormal or not according to the actual clutch pressure value and the target clutch pressure value.
Further, to achieve the above object, the present invention also proposes a clutch pressure abnormality fault detection apparatus including: a memory, a processor, and a clutch pressure anomaly fault detection program stored on the memory and operable on the processor, the clutch pressure anomaly fault detection program configured with steps to implement the clutch pressure anomaly fault detection method as described above.
In addition, in order to achieve the above object, the present invention also proposes a storage medium having a clutch pressure abnormal fault detection program stored thereon, which when executed by a processor, implements the steps of the clutch pressure abnormal fault detection method as described above.
The invention provides a clutch pressure abnormity fault detection method, which comprises the steps of obtaining current vehicle information and an actual clutch pressure value of a target vehicle; determining the current vehicle running condition of the target vehicle according to the current vehicle information; searching a target clutch pressure value corresponding to the current vehicle running condition; and judging whether the clutch pressure of the target vehicle is abnormal or not according to the actual clutch pressure value and the target clutch pressure value. The current vehicle running condition is determined according to the current vehicle information, the target clutch pressure value corresponding to the current vehicle running condition is searched, whether the clutch pressure is abnormal or not is judged according to the actual clutch pressure value and the target clutch pressure value, the defect that the clutch pressure is difficult to detect abnormally is overcome, and the effect of detecting the abnormal fault of the clutch pressure is improved.
Drawings
FIG. 1 is a schematic diagram of a clutch pressure anomaly fault detection device in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a clutch pressure anomaly fault detection method according to a first embodiment of the present invention;
FIG. 3 is a schematic flow chart of a clutch pressure anomaly fault detection method according to a second embodiment of the present invention;
FIG. 4 is a schematic flow chart of a clutch pressure anomaly fault detection method according to a third embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating clutch pressure abnormality determination according to an embodiment of the clutch pressure abnormality fault detection method of the present invention;
FIG. 6 is a schematic diagram illustrating an engine torque abnormality determination according to an embodiment of the clutch pressure abnormality fault detection method of the present invention;
FIG. 7 is a schematic diagram of a fault diagnosis of an embodiment of a method for detecting a clutch pressure abnormality according to the present invention;
fig. 8 is a functional block diagram of the abnormal clutch pressure failure detection apparatus according to the first embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a clutch pressure abnormality fault detection device in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the clutch pressure abnormality fault detection apparatus may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may comprise a Display screen (Display), an input unit such as keys, and the optional user interface 1003 may also comprise a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The Memory 1005 may be a Random Access Memory (RAM) Memory or a non-volatile Memory (e.g., a magnetic disk Memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration of the apparatus shown in FIG. 1 does not constitute a limitation of the clutch pressure anomaly fault detection apparatus, and may include more or fewer components than shown, or some components in combination, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a storage medium, may include therein an operating system, a network communication module, a user interface module, and a clutch pressure abnormality fault detection program.
In the clutch pressure abnormality fault detection apparatus shown in fig. 1, the network interface 1004 is mainly used for connecting an external network and performing data communication with other network apparatuses; the user interface 1003 is mainly used for connecting to a user equipment and performing data communication with the user equipment; the apparatus of the present invention calls a clutch pressure abnormality fault detection program stored in the memory 1005 through the processor 1001, and executes the clutch pressure abnormality fault detection method provided by the embodiment of the present invention.
Based on the hardware structure, the embodiment of the method for detecting the abnormal pressure fault of the clutch is provided.
Referring to fig. 2, fig. 2 is a schematic flow chart of a clutch pressure abnormality fault detection method according to a first embodiment of the present invention. In a first embodiment, the clutch pressure abnormality fault detection method includes the steps of:
in step S10, the current vehicle information and the actual clutch pressure value of the target vehicle are acquired.
It should be noted that the executing main body of the present embodiment may be a clutch pressure abnormal fault detection device, and may also be other devices that can achieve the same or similar functions.
It should be noted that the clutch in this embodiment may be a wet dual clutch DTC transmission, and the actual clutch pressure value is an actual clutch pressure value corresponding to the wet dual clutch DTC transmission. The current vehicle information may include vehicle speed information, steering information, and other information, which is not limited in this embodiment.
It should be understood that the present vehicle information of the target vehicle may be obtained from a Controller Area Network (Controller Area Network) of the target vehicle, the actual clutch pressure value P _ Act collected by the clutch pressure sensor may be obtained from a TCU (Transmission Control Unit) extended CAN Network, and other obtaining manners may also be used, which is not limited in this embodiment.
And step S20, determining the current vehicle running condition of the target vehicle according to the current vehicle information.
It should be understood that a plurality of vehicle driving conditions may be preset, each vehicle driving condition corresponding to different vehicle information, and after determining the current vehicle information of the target vehicle, the corresponding current vehicle driving condition may be determined according to the current vehicle information.
In a specific implementation, for example, three vehicle driving conditions may be preset, which are respectively: the low-speed running working condition, the medium-speed running working condition and the high-speed running working condition are set, the low-speed running working condition corresponds to a first vehicle speed range, the medium-speed running working condition corresponds to a second vehicle speed range, and the high-speed running working condition corresponds to a third vehicle speed range. After the current vehicle information is determined, the current vehicle speed information can be extracted from the current vehicle information to determine the current vehicle speed, and the current vehicle speed is judged to be in which vehicle speed range, so that the current vehicle running condition is determined according to the vehicle speed range. For example, when the current vehicle speed is within the first vehicle speed range, the current vehicle driving condition may be determined to be a low-speed driving condition.
And step S30, searching a target clutch pressure value corresponding to the current vehicle running condition.
It should be understood that different expected clutch pressure values expected to be provided by the TCU may be set for different vehicle driving conditions, and after the current vehicle driving condition is determined, the target clutch pressure value P _ Des corresponding to the current vehicle driving condition is searched from the expected clutch pressure values.
In a specific implementation, for example, a low-speed driving condition corresponding to a first expected clutch pressure value, a medium-speed driving condition corresponding to a second expected clutch pressure value, and a high-speed driving condition corresponding to a third expected clutch pressure value may be set. When the current vehicle running working condition is a low-speed running working condition, the first expected clutch pressure value corresponding to the low-speed running working condition can be used as the target clutch pressure value.
It can be understood that a pressure value mapping table may be established according to a corresponding relationship between a vehicle running condition and an expected clutch pressure value, and after the current vehicle running condition is determined, a target clutch pressure value corresponding to the current vehicle running condition is searched according to the pressure value mapping table. Other searching methods are also possible, and the embodiment is not limited to this.
And step S40, judging whether the clutch pressure of the target vehicle is abnormal according to the actual clutch pressure value and the target clutch pressure value.
It should be appreciated that after determining the actual clutch pressure value and the target clutch pressure value, the actual clutch pressure value and the target clutch pressure value may be compared to determine whether the clutch pressure of the target vehicle is abnormal.
And a clutch pressure difference value can be obtained according to the actual clutch pressure value and the target clutch pressure value, and whether the clutch pressure of the target vehicle is abnormal or not is judged according to the clutch pressure difference value. Other determination methods are also possible, and this embodiment does not limit this.
In the embodiment, the current vehicle information and the actual clutch pressure value of the target vehicle are acquired; determining the current vehicle running condition of the target vehicle according to the current vehicle information; searching a target clutch pressure value corresponding to the current vehicle running condition; and judging whether the clutch pressure of the target vehicle is abnormal or not according to the actual clutch pressure value and the target clutch pressure value. The current vehicle running condition is determined according to the current vehicle information, the target clutch pressure value corresponding to the current vehicle running condition is searched, whether the clutch pressure is abnormal or not is judged according to the actual clutch pressure value and the target clutch pressure value, the defect that the clutch pressure is difficult to detect abnormally is overcome, and the effect of detecting the abnormal fault of the clutch pressure is improved.
In an embodiment, as shown in fig. 3, a second embodiment of the clutch pressure abnormality fault detection method according to the present invention is proposed based on the first embodiment, and the step S40 includes:
and step S401, obtaining a clutch pressure difference value according to the actual clutch pressure value and the target clutch pressure value.
It should be appreciated that after determining the actual clutch pressure value P _ Act and the target clutch pressure value P _ Des, a clutch pressure differential value may be obtained from the actual clutch pressure value and the target clutch pressure value, and the clutch pressure differential value may be: p _ Des-P _ Act.
And step S402, detecting the duration of the pressure difference corresponding to the clutch pressure difference, and calculating the absolute value of the pressure difference of the clutch pressure difference.
It is to be understood that the pressure difference duration T1 Δ corresponding to the clutch pressure difference may be detected and the absolute value of the pressure difference P Δ, P Δ | P _ Des-P _ Act | of the clutch pressure difference calculated.
And step S403, judging whether the clutch pressure of the target vehicle is abnormal or not according to the absolute value of the pressure difference value and the duration time of the pressure difference value.
It should be appreciated that after obtaining the absolute value of the pressure difference and the duration of the pressure difference, the absolute value of the pressure difference may be compared to a preset pressure difference threshold and the duration of the pressure difference may be compared to a preset pressure time threshold to determine whether the clutch pressure of the target vehicle is abnormal.
It is understood that the preset pressure difference threshold P and the preset pressure time threshold T1 can be set by the user according to the actual situation, and the present embodiment is not limited thereto.
In an embodiment, in order to obtain a better detection result and make the detection of the abnormal clutch pressure more accurate, the step S403 includes:
comparing the absolute value of the pressure difference with a preset pressure difference threshold to obtain a pressure comparison result; comparing the pressure difference duration with a preset pressure time threshold to obtain a time comparison result; and judging whether the clutch pressure of the target vehicle is abnormal or not according to the pressure comparison result and the time comparison result.
It should be understood that the absolute value of the pressure difference may be compared with a preset pressure difference threshold to obtain a pressure comparison result, and the magnitude relationship between the absolute value of the pressure difference and the preset pressure difference threshold may be determined according to the pressure comparison result; the pressure difference duration may be compared to a preset pressure time threshold to obtain a time comparison result, and a magnitude relationship between the pressure difference duration and the preset pressure time threshold may be determined based on the time comparison result. And then whether the clutch pressure of the target vehicle is abnormal or not can be judged according to the pressure comparison result and the time comparison result.
After the step of determining whether the clutch pressure of the target vehicle is abnormal according to the pressure comparison result and the time comparison result, the method further comprises the following steps:
and when the pressure comparison result is that the absolute value of the pressure difference is larger than the preset pressure difference threshold value, and the time comparison result is that the duration of the pressure difference is larger than the preset pressure time threshold value, determining that the clutch pressure of the target vehicle is abnormal.
It is understood that the clutch pressure abnormality of the target vehicle is determined at P Δ > P and T1 Δ > T1.
And when the pressure comparison result is that the absolute value of the pressure difference is smaller than or equal to the preset pressure difference threshold value, or the time comparison result is that the duration of the pressure difference is smaller than or equal to the preset pressure time threshold value, determining that the clutch pressure of the target vehicle is normal.
It is understood that the clutch pressure of the target vehicle is determined to be normal at P Δ ≦ P or T1 Δ ≦ T1.
In this embodiment, a clutch pressure difference value is obtained according to the actual clutch pressure value and the target clutch pressure value; detecting the duration of a pressure difference value corresponding to the clutch pressure difference value, and calculating the absolute value of the pressure difference value of the clutch pressure difference value; and judging whether the clutch pressure of the target vehicle is abnormal or not according to the absolute value of the pressure difference value and the duration time of the pressure difference value. Therefore, the pressure difference value of the clutch is calculated, the pressure difference value duration corresponding to the pressure difference value of the clutch is detected, whether the pressure of the clutch is abnormal or not is judged according to the pressure difference value duration and the absolute value of the pressure difference value of the clutch, the accuracy of abnormality detection is further improved, and the detection result is more reliable.
In an embodiment, as shown in fig. 4, a third embodiment of the method for detecting an abnormal clutch pressure failure according to the present invention is proposed based on the first embodiment or the second embodiment, and in this embodiment, explained based on the first embodiment, after step S40, the method further includes:
and step S50, when the clutch pressure of the target vehicle is abnormal, acquiring the actual engine torque value of the target vehicle, and searching the target engine torque value corresponding to the current vehicle running condition.
It should be appreciated that the cause of the fault may be further detected when the clutch pressure of the target vehicle is abnormal. The actual engine torque value of the target vehicle can be obtained, the target engine torque value corresponding to the current vehicle running condition is searched, and the fault reason is determined according to the actual engine torque value and the target engine torque value.
It should be noted that the actual engine torque value Tq _ Act may be obtained from the entire vehicle CAN bus of the target vehicle, or may be obtained in another obtaining manner, which is not limited in this embodiment.
It should be understood that different driver expected engine torque values may be set for different vehicle driving conditions, and after determining the current vehicle driving condition, the target engine torque value Tq _ Des corresponding to the current vehicle driving condition is searched from the expected engine torque values.
In one implementation, for example, a low speed driving condition may be set to correspond to a first desired engine torque value, a medium speed driving condition may be set to correspond to a second desired engine torque value, and a high speed driving condition may be set to correspond to a third desired engine torque value. When the current vehicle driving condition is a low-speed driving condition, the first expected engine torque value corresponding to the low-speed driving condition can be used as the target engine torque value.
It can be understood that a torque value mapping table may be established according to a corresponding relationship between a vehicle running condition and an expected engine torque value, and after the current vehicle running condition is determined, a target engine torque value corresponding to the current vehicle running condition may be searched according to the torque value mapping table. Other searching methods are also possible, and the embodiment is not limited to this.
And step S60, obtaining an engine torque difference value according to the actual engine torque value and the target engine torque value.
It should be appreciated that after determining the actual engine torque value Tq _ Act and the target engine torque value Tq _ Des, an engine torque difference value may be derived from the actual engine torque value and the target engine torque value, and the engine torque difference value may be: tq _ Des-Tq _ Act.
Step S70, detecting a torque difference duration corresponding to the engine torque difference, and calculating a torque difference absolute value of the engine torque difference.
It should be understood that the torque difference duration T2 Δ corresponding to the engine torque difference may be detected and the absolute value of the torque difference Tq Δ, Tq Δ | Tq _ Des-Tq _ Act | of the engine torque difference calculated.
It is understood that the preset torque difference threshold Tq and the preset torque time threshold T2 may be set by a user in advance, and may be set by the user according to practical situations, which is not limited by the embodiment.
It should be appreciated that the cause of the fault may be detected based on the absolute value of the torque difference, the duration of the torque difference, a preset torque difference threshold, and a preset torque time threshold.
And step S80, judging the failure of the clutch pressure sensor when the absolute value of the torque difference is smaller than a preset torque difference threshold value and the duration of the torque difference is smaller than a preset torque time threshold value.
It is understood that at Tq Δ < Tq and T2 Δ < T2, the cause of the failure is determined to be a failure of the clutch pressure sensor.
In an embodiment, after the step S70, the method further includes:
and when the absolute value of the torque difference is larger than a preset torque difference threshold, the duration time of the torque difference is larger than a preset torque time threshold, and the actual engine torque value is larger than the target engine torque value, determining that the clutch pressure control valve is blocked.
Further, the steps may specifically be: and when the absolute value of the torque difference is larger than or equal to a preset torque difference threshold, the duration time of the torque difference is larger than or equal to a preset torque time threshold, and the actual engine torque value is larger than or equal to the target engine torque value, judging that the clutch pressure control valve is blocked.
It is understood that the cause of the failure is determined to be the occurrence of the sticking of the clutch pressure control valve at Tq Δ ≧ Tq, T2 Δ ≧ T2, and Tq _ Act ≧ Tq _ Des.
In an embodiment, after the step S70, the method further includes:
and when the absolute value of the torque difference is larger than a preset torque difference threshold, the duration time of the torque difference is larger than a preset torque time threshold, and the actual engine torque value is smaller than the target engine torque value, judging that the oil quantity of the transmission is insufficient.
Further, the steps may specifically be: and when the absolute value of the torque difference is greater than or equal to a preset torque difference threshold, the duration time of the torque difference is greater than or equal to a preset torque time threshold, and the actual engine torque value is smaller than the target engine torque value, judging that the oil quantity of the transmission is insufficient.
It is understood that when Tq Δ ≧ Tq, and T2 Δ ≧ T2, and Tq _ Act < Tq _ Des, the cause of the failure is determined to be insufficient transmission oil amount.
In a specific implementation, the scheme in the embodiment may be applied to transmission control software to implement a fault diagnosis function, as shown in fig. 5, 6, and 7, fig. 5 is a schematic diagram of clutch pressure abnormality determination, fig. 6 is a schematic diagram of engine torque abnormality determination, and fig. 7 is a schematic diagram of fault diagnosis, and through these three schematic diagrams, a user can conveniently know the operating state of a target vehicle.
In this embodiment, when the clutch pressure of the target vehicle is abnormal, the actual engine torque value of the target vehicle is obtained, and the target engine torque value corresponding to the current vehicle running condition is searched; obtaining an engine torque difference value according to the actual engine torque value and the target engine torque value; detecting the torque difference value duration corresponding to the engine torque difference value, and calculating the torque difference value absolute value of the engine torque difference value; and when the absolute value of the torque difference is smaller than a preset torque difference threshold value and the duration of the torque difference is smaller than a preset torque time threshold value, judging that the clutch pressure sensor has a fault. Therefore, when the pressure of the clutch is abnormal, the absolute value of the torque difference value and the duration time of the torque difference value are obtained, the fault reason is determined according to the absolute value of the torque difference value and the duration time of the torque difference value, and the fault detection effect is improved.
Furthermore, an embodiment of the present invention further provides a storage medium, where a clutch pressure abnormal fault detection program is stored, and when the clutch pressure abnormal fault detection program is executed by a processor, the steps of the clutch pressure abnormal fault detection method described above are implemented.
Since the storage medium adopts all technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and no further description is given here.
Further, referring to fig. 8, an embodiment of the present invention further provides a clutch pressure abnormality fault detection apparatus, including:
the information acquisition module 10 is used for acquiring current vehicle information and an actual clutch pressure value of a target vehicle.
It should be noted that the clutch in this embodiment may be a wet dual clutch DTC transmission, and the actual clutch pressure value is an actual clutch pressure value corresponding to the wet dual clutch DTC transmission. The current vehicle information may include vehicle speed information, steering information, and other information, which is not limited in this embodiment.
It should be understood that the present vehicle information of the target vehicle may be obtained from a Controller Area Network (Controller Area Network) of the target vehicle, the actual clutch pressure value P _ Act collected by the clutch pressure sensor may be obtained from a TCU (Transmission Control Unit) extended CAN Network, and other obtaining manners may also be used, which is not limited in this embodiment.
And the working condition determining module 20 is configured to determine a current vehicle driving working condition of the target vehicle according to the current vehicle information.
It should be understood that a plurality of vehicle driving conditions may be preset, each vehicle driving condition corresponding to different vehicle information, and after determining the current vehicle information of the target vehicle, the corresponding current vehicle driving condition may be determined according to the current vehicle information.
In a specific implementation, for example, three vehicle driving conditions may be preset, which are respectively: the low-speed running working condition, the medium-speed running working condition and the high-speed running working condition are set, the low-speed running working condition corresponds to a first vehicle speed range, the medium-speed running working condition corresponds to a second vehicle speed range, and the high-speed running working condition corresponds to a third vehicle speed range. After the current vehicle information is determined, the current vehicle speed information can be extracted from the current vehicle information to determine the current vehicle speed, and the current vehicle speed is judged to be in which vehicle speed range, so that the current vehicle running condition is determined according to the vehicle speed range. For example, when the current vehicle speed is within the first vehicle speed range, the current vehicle driving condition may be determined to be a low-speed driving condition.
And the information searching module 30 is used for searching the target clutch pressure value corresponding to the current vehicle running condition.
It should be understood that different expected clutch pressure values expected to be provided by the TCU may be set for different vehicle driving conditions, and after the current vehicle driving condition is determined, the target clutch pressure value P _ Des corresponding to the current vehicle driving condition is searched from the expected clutch pressure values.
In a specific implementation, for example, a low-speed driving condition corresponding to a first expected clutch pressure value, a medium-speed driving condition corresponding to a second expected clutch pressure value, and a high-speed driving condition corresponding to a third expected clutch pressure value may be set. When the current vehicle running working condition is a low-speed running working condition, the first expected clutch pressure value corresponding to the low-speed running working condition can be used as the target clutch pressure value.
It can be understood that a pressure value mapping table may be established according to a corresponding relationship between a vehicle running condition and an expected clutch pressure value, and after the current vehicle running condition is determined, a target clutch pressure value corresponding to the current vehicle running condition is searched according to the pressure value mapping table. Other searching methods are also possible, and the embodiment is not limited to this.
And the abnormity judgment module 40 is used for judging whether the clutch pressure of the target vehicle is abnormal or not according to the actual clutch pressure value and the target clutch pressure value.
It should be appreciated that after determining the actual clutch pressure value and the target clutch pressure value, the actual clutch pressure value and the target clutch pressure value may be compared to determine whether the clutch pressure of the target vehicle is abnormal.
And a clutch pressure difference value can be obtained according to the actual clutch pressure value and the target clutch pressure value, and whether the clutch pressure of the target vehicle is abnormal or not is judged according to the clutch pressure difference value. Other determination methods are also possible, and this embodiment does not limit this.
In the embodiment, the current vehicle information and the actual clutch pressure value of the target vehicle are acquired; determining the current vehicle running condition of the target vehicle according to the current vehicle information; searching a target clutch pressure value corresponding to the current vehicle running condition; and judging whether the clutch pressure of the target vehicle is abnormal or not according to the actual clutch pressure value and the target clutch pressure value. The current vehicle running condition is determined according to the current vehicle information, the target clutch pressure value corresponding to the current vehicle running condition is searched, whether the clutch pressure is abnormal or not is judged according to the actual clutch pressure value and the target clutch pressure value, the defect that the clutch pressure is difficult to detect abnormally is overcome, and the effect of detecting the abnormal fault of the clutch pressure is improved.
In an embodiment, the abnormality determining module 40 is further configured to obtain a clutch pressure difference according to the actual clutch pressure value and the target clutch pressure value; detecting the duration of a pressure difference value corresponding to the clutch pressure difference value, and calculating the absolute value of the pressure difference value of the clutch pressure difference value; and judging whether the clutch pressure of the target vehicle is abnormal or not according to the absolute value of the pressure difference value and the duration time of the pressure difference value.
In an embodiment, the abnormality determining module 40 is further configured to compare the absolute value of the pressure difference with a preset pressure difference threshold, so as to obtain a pressure comparison result; comparing the pressure difference duration with a preset pressure time threshold to obtain a time comparison result; and judging whether the clutch pressure of the target vehicle is abnormal or not according to the pressure comparison result and the time comparison result.
In an embodiment, the abnormality determination module 40 is further configured to determine that the clutch pressure of the target vehicle is abnormal when the pressure comparison result is that the absolute value of the pressure difference is greater than the preset pressure difference threshold, and the time comparison result is that the duration of the pressure difference is greater than the preset pressure time threshold.
In an embodiment, the apparatus for detecting a clutch pressure abnormality fault further includes a fault diagnosis module, configured to obtain an actual engine torque value of the target vehicle when the clutch pressure of the target vehicle is abnormal, and search for a target engine torque value corresponding to the current vehicle driving condition; obtaining an engine torque difference value according to the actual engine torque value and the target engine torque value; detecting the torque difference value duration corresponding to the engine torque difference value, and calculating the torque difference value absolute value of the engine torque difference value; and when the absolute value of the torque difference is smaller than a preset torque difference threshold value and the duration of the torque difference is smaller than a preset torque time threshold value, judging that the clutch pressure sensor has a fault.
In one embodiment, the fault diagnosis module is further configured to determine that the clutch pressure control valve is stuck when the absolute value of the torque difference is greater than a preset torque difference threshold, the duration of the torque difference is greater than a preset torque time threshold, and the actual engine torque value is greater than the target engine torque value.
In one embodiment, the fault diagnosis module is further configured to determine that the transmission oil amount is insufficient when the absolute value of the torque difference is greater than a preset torque difference threshold, the torque difference duration is greater than a preset torque time threshold, and the actual engine torque value is less than the target engine torque value.
Other embodiments or specific implementation methods of the clutch pressure abnormality fault detection device according to the present invention may refer to the above method embodiments, and are not described herein again.
It should be noted that, in this document, 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 like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) readable by an estimator as described above, and includes instructions for enabling an intelligent device (e.g. a mobile phone, an estimator, a clutch pressure abnormality fault detection device, an air conditioner, or a network clutch pressure abnormality fault detection device, etc.) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A clutch pressure abnormality fault detection method, characterized by comprising the steps of:
acquiring current vehicle information and an actual clutch pressure value of a target vehicle;
determining the current vehicle running condition of the target vehicle according to the current vehicle information;
searching a target clutch pressure value corresponding to the current vehicle running condition;
judging whether the clutch pressure of the target vehicle is abnormal or not according to the actual clutch pressure value and the target clutch pressure value;
when the clutch pressure of the target vehicle is abnormal, acquiring an actual engine torque value of the target vehicle, and searching a target engine torque value corresponding to the current vehicle running condition;
obtaining an engine torque difference value according to the actual engine torque value and the target engine torque value;
detecting the torque difference value duration corresponding to the engine torque difference value, and calculating the torque difference value absolute value of the engine torque difference value;
and when the absolute value of the torque difference is smaller than a preset torque difference threshold value and the duration of the torque difference is smaller than a preset torque time threshold value, judging that the clutch pressure sensor has a fault.
2. The clutch pressure abnormality fault detection method according to claim 1, wherein the judging whether the clutch pressure of the target vehicle is abnormal from the actual clutch pressure value and the target clutch pressure value includes:
obtaining a clutch pressure difference value according to the actual clutch pressure value and the target clutch pressure value;
detecting the duration of a pressure difference value corresponding to the clutch pressure difference value, and calculating the absolute value of the pressure difference value of the clutch pressure difference value;
and judging whether the clutch pressure of the target vehicle is abnormal or not according to the absolute value of the pressure difference value and the duration time of the pressure difference value.
3. The clutch pressure abnormality fault detection method according to claim 2, wherein the determining whether the clutch pressure of the target vehicle is abnormal based on the pressure difference absolute value and the pressure difference duration includes:
comparing the absolute value of the pressure difference with a preset pressure difference threshold to obtain a pressure comparison result;
comparing the pressure difference duration with a preset pressure time threshold to obtain a time comparison result;
and judging whether the clutch pressure of the target vehicle is abnormal or not according to the pressure comparison result and the time comparison result.
4. The clutch pressure abnormality fault detection method according to claim 3, characterized in that after determining whether the clutch pressure of the target vehicle is abnormal based on the pressure comparison result and the time comparison result, further comprising:
and when the pressure comparison result is that the absolute value of the pressure difference is larger than the preset pressure difference threshold value, and the time comparison result is that the duration of the pressure difference is larger than the preset pressure time threshold value, determining that the clutch pressure of the target vehicle is abnormal.
5. The clutch pressure abnormality fault detection method according to claim 1, after said detecting a torque difference duration of said engine torque difference and calculating a torque difference absolute value of said engine torque difference, further comprising:
and when the absolute value of the torque difference is larger than a preset torque difference threshold, the duration time of the torque difference is larger than a preset torque time threshold, and the actual engine torque value is larger than the target engine torque value, determining that the clutch pressure control valve is blocked.
6. The clutch pressure abnormality fault detection method according to claim 1, after said detecting a torque difference duration of said engine torque difference and calculating a torque difference absolute value of said engine torque difference, further comprising:
and when the absolute value of the torque difference is larger than a preset torque difference threshold, the duration time of the torque difference is larger than a preset torque time threshold, and the actual engine torque value is smaller than the target engine torque value, judging that the oil quantity of the transmission is insufficient.
7. A clutch pressure abnormality fault detection device, characterized by comprising:
the information acquisition module is used for acquiring current vehicle information and an actual clutch pressure value of a target vehicle;
the working condition determining module is used for determining the current vehicle running working condition of the target vehicle according to the current vehicle information;
the information searching module is used for searching a target clutch pressure value corresponding to the current vehicle running condition;
the abnormality determination module is used for determining whether the clutch pressure of the target vehicle is abnormal or not according to the actual clutch pressure value and the target clutch pressure value;
the fault diagnosis module is used for acquiring an actual engine torque value of the target vehicle when the clutch pressure of the target vehicle is abnormal, and searching a target engine torque value corresponding to the current vehicle running condition; obtaining an engine torque difference value according to the actual engine torque value and the target engine torque value; detecting the torque difference value duration corresponding to the engine torque difference value, and calculating the torque difference value absolute value of the engine torque difference value; and when the absolute value of the torque difference is smaller than a preset torque difference threshold value and the duration of the torque difference is smaller than a preset torque time threshold value, judging that the clutch pressure sensor has a fault.
8. A clutch pressure abnormality fault detection apparatus, characterized by comprising: a memory, a processor, and a clutch pressure abnormality fault detection program stored on the memory and executable on the processor, the clutch pressure abnormality fault detection program configured to implement the clutch pressure abnormality fault detection method according to any one of claims 1 to 6.
9. A storage medium having a clutch pressure abnormality fault detection program stored thereon, the clutch pressure abnormality fault detection program, when executed by a processor, implementing the clutch pressure abnormality fault detection method according to any one of claims 1 to 6.
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