Method, device and equipment for diagnosing abnormal fluctuation of rotational speed of AMT main shaft

Abstract

The application discloses a kind of AMT main shaft speed abnormal fluctuation fault diagnosis method, device and equipment, whether the maximum value of the speed of AMT main shaft in the difference of the minimum value of the speed in preset length is diagnosed to diagnose whether the speed abnormal fluctuation fault of AMT main shaft exists, the speed abnormal fluctuation of AMT main shaft is accurately judged;After diagnosing that the speed abnormal fluctuation fault of AMT main shaft exists, the theoretical speed of the AMT main shaft is calculated according to the gear of AMT main tank or the gear of AMT auxiliary tank, and the theoretical speed of the AMT main shaft is used as the logic input of AMT, can guarantee that vehicle can still be normally driven after the speed abnormal fluctuation fault of AMT main shaft appears, effectively avoid or reduce the vehicle operation loss caused by the speed abnormal fluctuation fault of AMT main shaft.

Description

Technical Field

[0001] This application relates to the field of vehicle fault diagnosis technology, and in particular to a method, apparatus and equipment for diagnosing abnormal fluctuations in the spindle speed of an AMT (Automated Manual Transmission Machine). Background Technology

[0002] An automated mechanical transmission (AMT) is a transmission system that automatically shifts gears based on vehicle speed and engine speed. Abnormal fluctuations in the AMT spindle speed can significantly impact the smoothness of vehicle operation, thus affecting the driving experience. Severe abnormal spindle speed fluctuations can even lead to serious vehicle accidents.

[0003] Therefore, how to diagnose abnormal fluctuations in AMT spindle speed and ensure smooth vehicle operation after such faults occur are technical problems that need to be solved. Summary of the Invention

[0004] The main objective of this application is to provide a method, apparatus, and equipment for diagnosing abnormal fluctuations in the spindle speed of an AMT (Automated Manual Transmission Machine), thereby addressing the aforementioned technical problems.

[0005] In a first aspect, this application provides a method for diagnosing abnormal fluctuations in the spindle speed of an AMT (Automated Manual Transmission Machine), the method comprising the following steps:

[0006] The difference between the maximum and minimum rotational speeds of the AMT spindle within a preset time period is used to diagnose whether the AMT spindle has an abnormal speed fluctuation fault.

[0007] After diagnosing the abnormal speed fluctuation fault of the AMT spindle, the theoretical speed of the AMT spindle is calculated based on the speed of the AMT intermediate shaft or the speed of the AMT output shaft, and the theoretical speed of the AMT spindle is used as the logic input of the AMT.

[0008] In some embodiments, diagnosing whether the AMT spindle has an abnormal speed fluctuation fault based on the difference between the maximum and minimum speed values ​​of the AMT spindle within a preset time period includes:

[0009] Using the preset duration as a period, calculate the difference between the maximum and minimum rotational speeds of the AMT spindle within the period;

[0010] If the difference is greater than a preset first difference threshold for M consecutive cycles, then the AMT spindle is diagnosed to have an abnormal speed fluctuation fault.

[0011] In some embodiments, the method further includes:

[0012] After determining that the AMT spindle has an abnormal speed fluctuation fault, if the difference is less than the preset second difference threshold for N consecutive cycles, then it is determined that the abnormal speed fluctuation fault of the AMT spindle has disappeared.

[0013] Wherein, the first difference threshold is greater than the second difference threshold.

[0014] In some embodiments, after diagnosing an abnormal speed fluctuation fault in the AMT spindle, the theoretical speed of the AMT spindle is calculated based on the speed of the AMT intermediate shaft or the speed of the AMT output shaft, including:

[0015] After diagnosing the abnormal speed fluctuation fault of the AMT spindle, determine whether the AMT main gearbox is in neutral and whether the AMT intermediate shaft speed sensor is faulty.

[0016] If the AMT main gearbox is not in neutral and the AMT intermediate shaft speed sensor is not faulty, the theoretical speed of the AMT main shaft is calculated based on the gear position of the AMT main gearbox and the AMT intermediate shaft speed monitored by the AMT intermediate shaft speed sensor.

[0017] If the AMT main gearbox is in neutral or the AMT intermediate shaft speed sensor is faulty, the theoretical speed of the AMT main shaft is calculated based on the gear position of the AMT rear auxiliary gearbox and the AMT output shaft speed.

[0018] In some embodiments, the theoretical rotational speed of the AMT spindle is calculated based on the gear position of the AMT main gearbox and the rotational speed of the AMT intermediate shaft monitored by the AMT intermediate shaft speed sensor, including:

[0019] The speed ratio of the AMT main gearbox is determined by referring to a table based on the gear positions of the AMT main gearbox;

[0020] The theoretical speed of the AMT spindle is obtained by dividing the rotational speed of the AMT intermediate shaft by the speed ratio of the AMT main gearbox.

[0021] In some embodiments, the theoretical rotational speed of the AMT spindle is calculated based on the gear position of the AMT rear auxiliary gearbox and the rotational speed of the AMT output shaft, including:

[0022] The speed ratio of the AMT rear auxiliary gearbox is determined by referring to a table based on the gear position of the AMT rear auxiliary gearbox;

[0023] The theoretical speed of the AMT main shaft is obtained by multiplying the speed ratio of the AMT rear auxiliary gearbox by the speed of the AMT output shaft.

[0024] In some embodiments, the diagnosis of whether the AMT spindle has a speed fault is based on the difference between the maximum and minimum speed of the AMT spindle within a preset time period, and further includes:

[0025] Determine whether the vehicle's current condition meets the preset fault diagnosis conditions;

[0026] If the current vehicle condition meets the above fault diagnosis conditions, then start the AMT spindle speed abnormal fluctuation fault diagnosis operation.

[0027] If the current vehicle condition does not meet the fault diagnosis conditions, the fault diagnosis operation for abnormal fluctuation of AMT spindle speed will not be performed.

[0028] In some embodiments, the method further includes:

[0029] When the vehicle's automatic transmission control system TCU is not in the initialization state, the AMT spindle speed sensor has no electrical fault, the engine is in the start state, the vehicle speed is greater than the preset vehicle speed threshold, the brake pedal release time is greater than the preset time calibration value, and the AMT is in the non-shifting state, it is determined that the current vehicle condition meets the fault diagnosis conditions.

[0030] Secondly, this application also provides a diagnostic device for abnormal fluctuations in the spindle speed of an AMT (Automated Manual Transmission Machine), the device comprising:

[0031] The diagnostic module diagnoses whether the AMT spindle has an abnormal speed fluctuation fault based on the difference between the maximum and minimum speed values ​​of the AMT spindle within a preset time period.

[0032] The calculation module is used to calculate the theoretical speed of the AMT spindle based on the gear position of the AMT main gearbox or the gear position of the AMT auxiliary gearbox after diagnosing an abnormal speed fluctuation fault in the AMT spindle, and use the theoretical speed of the AMT spindle as the logic input of the AMT.

[0033] In some embodiments, the diagnostic module is further configured to:

[0034] Using the preset duration as a period, calculate the difference between the maximum and minimum rotational speeds of the AMT spindle within the period;

[0035] If the difference is greater than a preset first difference threshold for M consecutive cycles, then the AMT spindle is diagnosed to have an abnormal speed fluctuation fault.

[0036] In some embodiments, the diagnostic module is further configured to:

[0037] After determining that the AMT spindle has an abnormal speed fluctuation fault, if the difference is less than the preset second difference threshold for N consecutive cycles, then it is determined that the abnormal speed fluctuation fault of the AMT spindle has disappeared.

[0038] Wherein, the first difference threshold is greater than the second difference threshold.

[0039] In some embodiments, the computing module is further configured to:

[0040] After diagnosing the abnormal speed fluctuation fault of the AMT spindle, determine whether the AMT main gearbox is in neutral and whether the AMT intermediate shaft speed sensor is faulty.

[0041] If the AMT main gearbox is not in neutral and the AMT intermediate shaft speed sensor is not faulty, the theoretical speed of the AMT main shaft is calculated based on the gear position of the AMT main gearbox and the AMT intermediate shaft speed monitored by the AMT intermediate shaft speed sensor.

[0042] If the AMT main gearbox is in neutral or the AMT intermediate shaft speed sensor is faulty, the theoretical speed of the AMT main shaft is calculated based on the gear position of the AMT rear auxiliary gearbox and the AMT output shaft speed.

[0043] In some embodiments, the computing module is further configured to:

[0044] The speed ratio of the AMT main gearbox is determined by referring to a table based on the gear positions of the AMT main gearbox;

[0045] The theoretical speed of the AMT spindle is obtained by dividing the rotational speed of the AMT intermediate shaft by the speed ratio of the AMT main gearbox.

[0046] In some embodiments, the computing module is further configured to:

[0047] The speed ratio of the AMT rear auxiliary gearbox is determined by referring to a table based on the gear position of the AMT rear auxiliary gearbox;

[0048] The theoretical speed of the AMT main shaft is obtained by multiplying the speed ratio of the AMT rear auxiliary gearbox by the speed of the AMT output shaft.

[0049] In some embodiments, the device is also used for:

[0050] Determine whether the vehicle's current condition meets the preset fault diagnosis conditions;

[0051] If the current vehicle condition meets the above fault diagnosis conditions, then start the AMT spindle speed abnormal fluctuation fault diagnosis operation.

[0052] If the current vehicle condition does not meet the fault diagnosis conditions, the fault diagnosis operation for abnormal fluctuation of AMT spindle speed will not be performed.

[0053] In some embodiments, when the vehicle's automatic transmission control system TCU is not in the initialization state, the AMT spindle speed sensor has no electrical fault, the engine is in the start state, the vehicle speed is greater than a preset vehicle speed threshold, the brake pedal release time is greater than a preset duration calibration value, and the AMT is in a non-shifting state, the current vehicle condition is determined to meet the fault diagnosis conditions.

[0054] Thirdly, this application also provides a computer device, the computer device including a processor, a memory, and a computer program stored in the memory and executable by the processor, wherein when the computer program is executed by the processor, it implements the steps of the diagnostic method for abnormal fluctuation faults of AMT spindle speed as described above.

[0055] This application provides a method, apparatus, and device for diagnosing abnormal speed fluctuations in an AMT spindle. By diagnosing the presence of abnormal speed fluctuations in the AMT spindle based on the difference between the maximum and minimum speed values ​​within a preset time period, it achieves accurate judgment of abnormal speed fluctuations in the AMT spindle. After diagnosing the presence of abnormal speed fluctuations in the AMT spindle, the theoretical speed of the AMT spindle is calculated based on the gear position of the AMT main gearbox or the AMT auxiliary gearbox, and this theoretical speed is used as the logic input of the AMT. This ensures that the vehicle can still operate normally after an abnormal speed fluctuation fault occurs in the AMT spindle, effectively avoiding or reducing vehicle operation losses caused by abnormal speed fluctuations in the AMT spindle. Attached Figure Description

[0056] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0057] Figure 1 A flowchart illustrating a diagnostic method for abnormal spindle speed fluctuation faults in an AMT (Automated Manual Transmission) system, as provided in this application embodiment.

[0058] Figure 2 A schematic diagram illustrating the specific process for diagnosing abnormal fluctuations in AMT spindle speed;

[0059] Figure 3 A schematic diagram illustrating the calculation process for the theoretical spindle speed of an AMT (Automated Manual Transmission Machine).

[0060] Figure 4 A schematic block diagram of a diagnostic device for abnormal fluctuations in AMT spindle speed provided in an embodiment of this application;

[0061] Figure 5 This is a schematic block diagram of the structure of a computer device according to an embodiment of this application.

[0062] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0063] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0064] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.

[0065] This application provides a method, apparatus, and device for diagnosing abnormal spindle speed fluctuations in an AMT (Automated Guided Vehicle) system. The method for diagnosing abnormal spindle speed fluctuations can be applied to computer equipment, such as vehicle controllers or onboard computers.

[0066] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0067] Please refer to Figure 1 , Figure 1 This is a flowchart illustrating a diagnostic method for abnormal spindle speed fluctuation faults in an AMT (Automated Manual Transmission) system, as provided in an embodiment of this application.

[0068] like Figure 1 As shown, the overall idea of ​​this method includes steps S1 to S2.

[0069] Step S1: Diagnose whether the AMT spindle has an abnormal speed fluctuation fault based on the difference between the maximum and minimum speed values ​​of the AMT spindle within a preset time period.

[0070] Step S2: After diagnosing the abnormal speed fluctuation fault of the AMT spindle, calculate the theoretical speed of the AMT spindle based on the speed of the AMT intermediate shaft or the speed of the AMT output shaft, and use the theoretical speed of the AMT spindle as the logic input of the AMT.

[0071] In a preferred embodiment, before diagnosing whether the AMT spindle has a speed fault based on the difference between the maximum and minimum speed values ​​of the AMT spindle within a preset time period, the method further includes: determining whether the current vehicle condition meets preset fault diagnosis conditions; if the current vehicle condition meets the fault diagnosis conditions, then initiating the AMT spindle speed abnormal fluctuation fault diagnosis operation; if the current vehicle condition does not meet the fault diagnosis conditions, then not performing the AMT spindle speed abnormal fluctuation fault diagnosis operation.

[0072] It is worth noting that in this embodiment, the AMT main shaft speed is read in real time using an AMT main shaft speed sensor.

[0073] Exemplary, such as Figure 2 As shown, after the vehicle is powered on, the AMT spindle speed sensor monitors the AMT spindle speed in real time and simultaneously determines whether the vehicle's current condition meets six preset basic fault diagnosis conditions. These six basic conditions include: determining whether the automatic transmission control system (TCU) is in the initialization process; determining whether the AMT spindle speed sensor has an electrical fault; determining whether the engine is running; determining whether the vehicle speed is greater than a preset speed threshold; determining whether the brake pedal release time is greater than a preset duration calibration value; and determining whether the AMT is in a non-shifting state. When the vehicle's automatic transmission control system (TCU) is not in the initialization state, the AMT spindle speed sensor has no electrical fault, the engine is running, the vehicle speed is greater than the preset speed threshold, the brake pedal release time is greater than the preset duration calibration value, and the AMT is in a non-shifting state, the vehicle's current condition is determined to meet the aforementioned fault diagnosis conditions.

[0074] Preferably, when an electrical fault is detected in the AMT spindle speed sensor, the corresponding fault can be displayed on the vehicle's instrument panel to remind the driver to troubleshoot the electrical fault. Furthermore, detecting electrical faults in the AMT spindle speed sensor can prevent misdiagnosis of abnormal fluctuations in AMT spindle speed caused by a faulty AMT spindle speed sensor.

[0075] It is worth noting that during vehicle startup, braking, and idling, the AMT spindle speed may exhibit various special operating conditions, such as sudden decreases or increases in speed. These values ​​cannot be used as diagnostic data for AMT spindle speed abnormal fluctuation faults. Therefore, in this embodiment, the AMT spindle speed abnormal fluctuation fault diagnosis operation is activated after the vehicle condition meets the aforementioned fault diagnosis conditions. This ensures that scenarios with special speeds in the AMT spindle during vehicle startup and braking are not included in the AMT spindle speed abnormal fluctuation fault diagnosis, thereby guaranteeing the accuracy of the AMT spindle speed abnormal fluctuation fault diagnosis.

[0076] In some embodiments, diagnosing whether the AMT spindle has an abnormal speed fluctuation fault based on the difference between the maximum and minimum speed values ​​of the AMT spindle within a preset time period includes: calculating the difference between the maximum and minimum speed values ​​of the AMT spindle within a period of the preset time period; if the difference is greater than a preset first difference threshold for M consecutive periods, then diagnosing that the AMT spindle has an abnormal speed fluctuation fault.

[0077] Preferably, after diagnosing an abnormal speed fluctuation fault in the AMT spindle, a fault alert is issued via the vehicle's instrument panel. Specifically, this alert can be displayed on the instrument panel screen or via audio prompts.

[0078] For example, after the current vehicle condition meets the preset fault diagnosis conditions, the difference Nd between the maximum and minimum spindle speed within the preset time period is calculated. If Nd is greater than the calibrated first difference threshold Nmax and occurs continuously for more than X1 cycles, it is determined that there is an abnormal fluctuation fault in the spindle speed. The fault is displayed on the instrument panel to remind the driver to deal with it in time.

[0079] Furthermore, after determining that the AMT spindle has an abnormal speed fluctuation fault, if the difference is less than a preset second difference threshold for N consecutive cycles, then it is determined that the abnormal speed fluctuation fault of the AMT spindle has disappeared; wherein, the first difference threshold is greater than the second difference threshold.

[0080] For example, after diagnosing an abnormal speed fluctuation fault in the AMT spindle, if the difference in AMT spindle speed Nd over the next X2 cycles is less than the calibrated second difference threshold Nmin, it is determined that the abnormal spindle speed fluctuation fault has been eliminated, and the instrument will no longer display the relevant fault.

[0081] Furthermore, after diagnosing the abnormal speed fluctuation fault of the AMT spindle, it is determined whether the AMT main gearbox is in neutral and whether the AMT intermediate shaft speed sensor is faulty. If the AMT main gearbox is not in neutral and the AMT intermediate shaft speed sensor is not faulty, the theoretical speed of the AMT spindle is calculated based on the gear position of the AMT main gearbox and the AMT intermediate shaft speed monitored by the AMT intermediate shaft speed sensor. If the AMT main gearbox is in neutral or the AMT intermediate shaft speed sensor is faulty, the theoretical speed of the AMT spindle is calculated based on the gear position of the AMT rear auxiliary gearbox and the AMT output shaft speed.

[0082] In some embodiments, the theoretical rotational speed of the AMT spindle is calculated based on the gear position of the AMT main gearbox and the rotational speed of the AMT intermediate shaft monitored by the AMT intermediate shaft speed sensor, including: determining the speed ratio of the AMT main gearbox by looking up the gear position of the AMT main gearbox; and dividing the rotational speed of the AMT intermediate shaft by the speed ratio of the AMT main gearbox to obtain the theoretical rotational speed of the AMT spindle.

[0083] Explanatoryly, determining whether the AMT main gearbox is in neutral is because when the AMT main gearbox is in neutral, the AMT intermediate shaft and the AMT main shaft are not coupled, therefore the theoretical speed of the AMT main shaft cannot be calculated from the speed of the AMT intermediate shaft. When the AMT main gearbox is not in neutral but in gear, the AMT intermediate shaft and the AMT main shaft are coupled, and the theoretical speed of the AMT main shaft can be calculated from the speed of the AMT intermediate shaft.

[0084] Furthermore, after diagnosing the abnormal speed fluctuation fault of the AMT spindle, this embodiment determines whether the AMT intermediate shaft speed sensor is faulty, which can ensure the accuracy of the obtained AMT intermediate shaft speed value, thereby ensuring the accuracy of the calculated theoretical speed.

[0085] As an example, after diagnosing an abnormal fluctuation in AMT spindle speed, the current gear position of the AMT master gearbox is monitored. If the AMT master gearbox is not in neutral, the AMT intermediate shaft speed sensor is further monitored for faults. If no faults are found, the current AMT master gearbox gear is queried. Based on the AMT master gearbox gear, the vehicle's preset gear ratio mapping table is consulted to obtain the AMT master gearbox gear ratio. Then, based on the AMT intermediate shaft speed and the master gearbox gear ratio, the theoretical value of the AMT spindle speed is calculated, i.e., AMT spindle speed = AMT intermediate shaft speed / AMT master gearbox gear ratio.

[0086] In some embodiments, the theoretical speed of the AMT main shaft is calculated based on the gear position of the AMT rear auxiliary gearbox and the AMT output shaft speed, including: determining the speed ratio of the AMT rear auxiliary gearbox by looking up the gear position of the AMT rear auxiliary gearbox in a table; and multiplying the speed ratio of the AMT rear auxiliary gearbox by the AMT output shaft speed to obtain the theoretical speed of the AMT main shaft.

[0087] As an example, when the AMT main gearbox is in neutral or the current AMT intermediate shaft speed sensor is faulty, the current AMT rear auxiliary gearbox status is monitored. Based on the AMT rear auxiliary gearbox gear position, a preset mapping table of AMT rear auxiliary gearbox gear positions and speed ratios is consulted to obtain the AMT rear auxiliary gearbox gear ratio. Then, based on the AMT output shaft speed and the AMT rear auxiliary gearbox gear ratio, the theoretical value of the AMT main shaft speed is calculated, i.e., AMT main shaft speed = AMT output shaft speed * AMT rear auxiliary gearbox gear ratio.

[0088] It is worth noting that when an abnormal fluctuation in AMT spindle speed is diagnosed, the theoretical value of the AMT spindle speed calculated above is used instead of the actual AMT spindle speed as the input to the subsequent transmission control logic. This ensures that the vehicle can still operate normally after the abnormal fluctuation in AMT spindle speed occurs. If the abnormal fluctuation in AMT spindle speed is eliminated, the actual signal value from the spindle speed sensor is used.

[0089] Furthermore, the diagnostic method for abnormal AMT spindle speed fluctuation faults provided in this embodiment can also be extended to the abnormal processing of other speed signals of the gearbox, such as intermediate shaft and output shaft.

[0090] In one specific embodiment, this method is applied to a 12-speed AMT vehicle. When the TCU is not in the initialization process, the AMT spindle speed sensor has no electrical fault, the engine is running, the vehicle speed is greater than 10 km / h, the brake pedal release time exceeds 1000 ms, and the transmission is currently in a non-shifting state, the maximum difference in spindle speed within a 100 ms period is calculated. If the difference is greater than 150 rpm and occurs three times consecutively, an abnormal spindle speed fluctuation fault is reported on the instrument panel to remind the driver to handle it promptly. After the fault occurs, if the maximum difference calculated in subsequent time periods is less than 20 rpm and occurs three times consecutively, it is determined that the abnormal spindle speed fault has been eliminated, and the instrument panel no longer displays the related fault.

[0091] After diagnosing an abnormal fluctuation in AMT main shaft speed, the current AMT master gear is checked. If the master gear is not in neutral and the AMT intermediate shaft speed sensor is functioning correctly, the theoretical AMT main shaft speed is calculated using the intermediate shaft speed and the master gear ratio. If the master gear is in neutral or the intermediate shaft speed sensor is faulty, the theoretical AMT main shaft speed is calculated using the AMT output shaft speed and the rear auxiliary gear ratio. When an abnormal fluctuation in AMT main shaft speed is reported, the theoretical speed of the AMT main shaft is used instead of the actual speed as input to the subsequent transmission control logic. If the fault is resolved, the actual signal value from the main shaft speed sensor is used. Vehicle configuration is then performed accordingly.

[0092] This application provides a diagnostic method for abnormal speed fluctuation faults of AMT spindles. Its advantages lie in that it diagnoses the presence of abnormal speed fluctuation faults in the AMT spindle by calculating the difference between the maximum and minimum speed values ​​of the AMT spindle within a preset time period, thus achieving accurate judgment of abnormal speed fluctuations in the AMT spindle. After diagnosing the presence of abnormal speed fluctuation faults in the AMT spindle, it calculates the theoretical speed of the AMT spindle based on the gear position of the AMT main gearbox or the AMT auxiliary gearbox, and uses the theoretical speed of the AMT spindle as the logic input of the AMT. This ensures that the vehicle can still operate normally after the AMT spindle experiences abnormal speed fluctuation faults, effectively avoiding vehicle operation losses caused by AMT spindle speed fluctuation faults.

[0093] Please refer to Figure 4 , Figure 4 This is a schematic block diagram of a diagnostic device for abnormal fluctuations in the spindle speed of an AMT (Automated Manual Transmission Machine) provided in an embodiment of this application.

[0094] like Figure 4 As shown, the device includes:

[0095] The diagnostic module diagnoses whether the AMT spindle has an abnormal speed fluctuation fault based on the difference between the maximum and minimum speed values ​​of the AMT spindle within a preset time period.

[0096] The calculation module is used to calculate the theoretical speed of the AMT spindle based on the speed of the AMT intermediate shaft or the speed of the AMT output shaft after diagnosing an abnormal speed fluctuation fault in the AMT spindle, and to use the theoretical speed of the AMT spindle as the logic input of the AMT.

[0097] The diagnostic module is also used for:

[0098] Using the preset duration as a period, calculate the difference between the maximum and minimum rotational speeds of the AMT spindle within the period;

[0099] If the difference is greater than a preset first difference threshold for M consecutive cycles, then the AMT spindle is diagnosed to have an abnormal speed fluctuation fault.

[0100] The diagnostic module is also used for:

[0101] After determining that the AMT spindle has an abnormal speed fluctuation fault, if the difference is less than the preset second difference threshold for N consecutive cycles, then it is determined that the abnormal speed fluctuation fault of the AMT spindle has disappeared.

[0102] Wherein, the first difference threshold is greater than the second difference threshold.

[0103] The calculation module is further used for:

[0104] After diagnosing the abnormal speed fluctuation fault of the AMT spindle, determine whether the AMT main gearbox is in neutral and whether the AMT intermediate shaft speed sensor is faulty.

[0105] If the AMT main gearbox is not in neutral and the AMT intermediate shaft speed sensor is not faulty, the theoretical speed of the AMT main shaft is calculated based on the gear position of the AMT main gearbox and the AMT intermediate shaft speed monitored by the AMT intermediate shaft speed sensor.

[0106] If the AMT main gearbox is in neutral or the AMT intermediate shaft speed sensor is faulty, the theoretical speed of the AMT main shaft is calculated based on the gear position of the AMT rear auxiliary gearbox and the AMT output shaft speed.

[0107] The calculation module is further used for:

[0108] The speed ratio of the AMT main gearbox is determined by referring to a table based on the gear positions of the AMT main gearbox;

[0109] The theoretical speed of the AMT spindle is obtained by dividing the rotational speed of the AMT intermediate shaft by the speed ratio of the AMT main gearbox.

[0110] The calculation module is further used for:

[0111] The speed ratio of the AMT rear auxiliary gearbox is determined by referring to a table based on the gear position of the AMT rear auxiliary gearbox;

[0112] The theoretical speed of the AMT main shaft is obtained by multiplying the speed ratio of the AMT rear auxiliary gearbox by the speed of the AMT output shaft.

[0113] The device is also used for:

[0114] Determine whether the vehicle's current condition meets the preset fault diagnosis conditions;

[0115] If the current vehicle condition meets the above fault diagnosis conditions, then start the AMT spindle speed abnormal fluctuation fault diagnosis operation.

[0116] If the current vehicle condition does not meet the fault diagnosis conditions, the fault diagnosis operation for abnormal fluctuation of AMT spindle speed will not be performed.

[0117] Specifically, when the vehicle's automatic transmission control system TCU is not in the initialization state, the AMT spindle speed sensor has no electrical fault, the engine is in the start state, the vehicle speed is greater than the preset vehicle speed threshold, the brake pedal release time is greater than the preset time calibration value, and the AMT is in the non-shifting state, the current vehicle condition is determined to meet the fault diagnosis conditions.

[0118] It should be noted that those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the above-described device and its modules and units can be referred to the corresponding processes in the foregoing embodiments, and will not be repeated here.

[0119] The diagnostic device for abnormal fluctuations in AMT spindle speed provided in the above embodiments can be implemented as a computer program, which can be used in, for example... Figure 5 It runs on the computer device shown.

[0120] Please see Figure 5 , Figure 5 This is a schematic block diagram illustrating the structure of a computer device provided in an embodiment of this application. The computer device can be a vehicle controller.

[0121] like Figure 5 As shown, the computer device includes a processor, memory, and network interface connected via a system bus, wherein the memory may include non-volatile storage media and internal memory.

[0122] Non-volatile storage media can store operating systems and computer programs. These computer programs include program instructions that, when executed, cause the processor to perform any diagnostic method for abnormal fluctuations in AMT spindle speed.

[0123] The processor provides computing and control capabilities, supporting the operation of the entire computer device.

[0124] The internal memory provides an environment for the execution of computer programs in non-volatile storage media. When the computer program is executed by the processor, it enables the processor to perform any diagnostic method for abnormal fluctuations in the AMT spindle speed.

[0125] This network interface is used for network communication, such as sending assigned tasks. Those skilled in the art will understand that... Figure 5 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0126] It should be understood that the processor can be a Central Processing Unit (CPU), but it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Among these, a general-purpose processor can be a microprocessor or any conventional processor.

[0127] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0128] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above descriptions are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for diagnosing abnormal fluctuations in the spindle speed of an AMT (Automated Manual Transmission Machine), characterized in that, include: The difference between the maximum and minimum rotational speeds of the AMT spindle within a preset time period is used to diagnose whether the AMT spindle has an abnormal speed fluctuation fault. After diagnosing the abnormal speed fluctuation fault of the AMT spindle, the theoretical speed of the AMT spindle is calculated based on the speed of the AMT intermediate shaft or the speed of the AMT output shaft, and the theoretical speed of the AMT spindle is used as the logic input of the AMT. Specifically, after diagnosing an abnormal speed fluctuation fault in the AMT spindle, the theoretical speed of the AMT spindle is calculated based on the speed of the AMT intermediate shaft or the speed of the AMT output shaft, including: After diagnosing the abnormal speed fluctuation fault of the AMT spindle, determine whether the AMT main gearbox is in neutral and whether the AMT intermediate shaft speed sensor is faulty. If the AMT main gearbox is not in neutral and the AMT intermediate shaft speed sensor is not faulty, the theoretical speed of the AMT main shaft is calculated based on the gear position of the AMT main gearbox and the AMT intermediate shaft speed monitored by the AMT intermediate shaft speed sensor. If the AMT main gearbox is in neutral or the AMT intermediate shaft speed sensor is faulty, the theoretical speed of the AMT main shaft is calculated based on the gear position of the AMT rear auxiliary gearbox and the AMT output shaft speed.

2. The diagnostic method for abnormal spindle speed fluctuation faults in AMT according to claim 1, characterized in that, Diagnosing whether the AMT spindle has an abnormal speed fluctuation fault based on the difference between the maximum and minimum speed of the AMT spindle within a preset time period includes: Using the preset duration as a period, calculate the difference between the maximum and minimum rotational speeds of the AMT spindle within the period; If the difference is greater than a preset first difference threshold for M consecutive cycles, then the AMT spindle is diagnosed to have an abnormal speed fluctuation fault.

3. The diagnostic method for abnormal spindle speed fluctuation faults in AMT according to claim 2, characterized in that, Also includes: After determining that the AMT spindle has an abnormal speed fluctuation fault, if the difference is less than the preset second difference threshold for N consecutive cycles, then it is determined that the abnormal speed fluctuation fault of the AMT spindle has disappeared. Wherein, the first difference threshold is greater than the second difference threshold.

4. The diagnostic method for abnormal spindle speed fluctuation faults in AMT according to claim 1, characterized in that, The theoretical speed of the AMT spindle is calculated based on the gear position of the AMT main gearbox and the speed of the AMT intermediate shaft monitored by the AMT intermediate shaft speed sensor, including: The speed ratio of the AMT main gearbox is determined by referring to a table based on the gear positions of the AMT main gearbox; The theoretical speed of the AMT spindle is obtained by dividing the rotational speed of the AMT intermediate shaft by the speed ratio of the AMT main gearbox.

5. The diagnostic method for abnormal spindle speed fluctuation faults in AMT according to claim 1, characterized in that, The theoretical speed of the AMT spindle is calculated based on the gear position of the AMT rear auxiliary gearbox and the AMT output shaft speed, including: The speed ratio of the AMT rear auxiliary gearbox is determined by referring to a table based on the gear position of the AMT rear auxiliary gearbox; The theoretical speed of the AMT main shaft is obtained by multiplying the speed ratio of the AMT rear auxiliary gearbox by the speed of the AMT output shaft.

6. The diagnostic method for abnormal spindle speed fluctuation faults in AMT according to claim 1, characterized in that, The diagnosis of whether the AMT spindle has a speed fault is based on the difference between the maximum and minimum speed of the AMT spindle within a preset time period, and previously included: Determine whether the vehicle's current condition meets the preset fault diagnosis conditions; If the current vehicle condition meets the above fault diagnosis conditions, then start the AMT spindle speed abnormal fluctuation fault diagnosis operation. If the current vehicle condition does not meet the fault diagnosis conditions, the fault diagnosis operation for abnormal fluctuation of AMT spindle speed will not be performed.

7. The diagnostic method for abnormal spindle speed fluctuation faults in AMT according to claim 6, characterized in that, Also includes: When the vehicle's automatic transmission control system TCU is not in the initialization state, the AMT spindle speed sensor has no electrical fault, the engine is in the start state, the vehicle speed is greater than the preset vehicle speed threshold, the brake pedal release time is greater than the preset time calibration value, and the AMT is in the non-shifting state, it is determined that the current vehicle condition meets the fault diagnosis conditions.

8. A diagnostic device for abnormal fluctuations in AMT spindle speed, characterized in that, include: The diagnostic module diagnoses whether the AMT spindle has an abnormal speed fluctuation fault based on the difference between the maximum and minimum speed values ​​of the AMT spindle within a preset time period. The calculation module is used to calculate the theoretical speed of the AMT spindle based on the speed of the AMT intermediate shaft or the speed of the AMT output shaft after diagnosing the abnormal speed fluctuation fault of the AMT spindle, and use the theoretical speed of the AMT spindle as the logic input of the AMT. The calculation module is further used for: After diagnosing the abnormal speed fluctuation fault of the AMT spindle, determine whether the AMT main gearbox is in neutral and whether the AMT intermediate shaft speed sensor is faulty. If the AMT main gearbox is not in neutral and the AMT intermediate shaft speed sensor is not faulty, the theoretical speed of the AMT main shaft is calculated based on the gear position of the AMT main gearbox and the AMT intermediate shaft speed monitored by the AMT intermediate shaft speed sensor. If the AMT main gearbox is in neutral or the AMT intermediate shaft speed sensor is faulty, the theoretical speed of the AMT main shaft is calculated based on the gear position of the AMT rear auxiliary gearbox and the AMT output shaft speed.

9. A computer device, characterized in that, The computer device includes a processor, a memory, and a computer program stored in the memory and executable by the processor, wherein when the computer program is executed by the processor, it implements the steps of the diagnostic method for abnormal fluctuation faults of AMT spindle speed as described in any one of claims 1 to 7.

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