AMT downshift fault diagnosis method and device, electronic equipment and storage medium

Abstract

This invention relates to the field of vehicle technology, and discloses an AMT downshifting fault diagnosis method, device, electronic equipment, and storage medium. The method includes: sequentially controlling engine torque reduction and clutch disengagement; shifting the AMT master gearbox to neutral; shifting the AMT front and rear auxiliary gearboxes; then controlling the clutch to engage to the target position and acquiring the AMT output shaft speed to calculate the engine target speed; acquiring the actual engine speed; and then calculating the AMT input shaft speed change rate when the engine target speed and the actual engine speed meet a preset speed condition; when the AMT input shaft speed change rate meets a preset change rate condition, starting a timer; and acquiring the current AMT input shaft speed when the timer meets a preset timing condition; and determining a downshifting clutch speed regulation fault when the current AMT input shaft speed and the engine target speed meet fault determination conditions. This invention can diagnose AMT downshifting clutch speed regulation failure faults.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to an AMT downshift fault diagnosis method, device, electronic equipment, and storage medium. Background Technology

[0002] In the field of AMT automatic transmissions for commercial vehicles, speed synchronization during dynamic downshifting is one of the key aspects.

[0003] Currently, downshifting synchronization in commercial vehicle AMT transmissions typically employs a clutch engagement method. Specifically, clutch engagement increases the speeds of the input shaft, intermediate shaft, and engagement gear ring, waiting for a downshift window where the input shaft speed is slightly higher than the engagement sleeve speed. During this synchronization window, the actuator solenoid valve is activated, pushing the engagement sleeve to mesh with the target gear gear ring. After the shift is complete, the clutch is fully engaged again.

[0004] However, if the clutch engagement fails to raise the input shaft speed and the required speed difference cannot be met, gear shifting will fail, and the vehicle will be unable to engage a gear and continue driving. There is a gap in the existing technology for diagnosing AMT downshift clutch speed regulation failures. Summary of the Invention

[0005] The purpose of this invention is to provide an AMT downshift fault diagnosis method, device, electronic device, and storage medium, which can at least diagnose AMT downshift clutch speed regulation failure faults, realize rapid fault location, and improve maintenance efficiency.

[0006] To address the aforementioned technical problems, in a first aspect, the present invention provides an AMT downshift fault diagnosis method, comprising at least:

[0007] S1. Sequentially control the engine to reduce torque and disengage the clutch, shift the AMT main gearbox to neutral, shift the AMT front and rear auxiliary gearboxes, and then control the clutch to engage to the target position and obtain the AMT output shaft speed to calculate the engine target speed.

[0008] S2. Obtain the actual engine speed, and then calculate the AMT input shaft speed change rate when the target engine speed and the actual engine speed meet the preset speed conditions.

[0009] S3. When the rate of change of the AMT input shaft speed meets the preset rate of change condition, start the timer, and when the timer meets the preset timing condition, obtain the current AMT input shaft speed.

[0010] S4. When the current AMT input shaft speed and the engine target speed meet the fault determination conditions, a downshift clutch speed regulation fault is determined.

[0011] Optionally, step S1 specifically includes at least:

[0012] Control the engine to reduce torque and the clutch to disengage;

[0013] Determine whether the engine torque reduction and clutch disengagement are complete;

[0014] When the engine torque reduction and clutch disengagement are completed, the AMT master gearbox is switched to neutral.

[0015] Determine whether the AMT main box has completed the neutral disengagement process;

[0016] When the AMT main gearbox is in neutral, control the AMT front and rear auxiliary gearboxes to shift gears.

[0017] Determine whether the shifting of the AMT front and rear auxiliary gearboxes is complete;

[0018] When the AMT front and rear auxiliary gearboxes complete shifting, the clutches are controlled to engage at least at a preset slope to the target position and the AMT output shaft speed is obtained. Then, the engine target speed is calculated at least based on the AMT output shaft speed and the target gear ratio.

[0019] Optionally, the fact that the target engine speed and the actual engine speed meet the preset speed condition means at least that the actual engine speed is not less than the difference between the target engine speed and the preset speed.

[0020] Optionally, the AMT input shaft speed change rate satisfying the preset change rate condition means at least that the AMT input shaft speed change rate is not greater than the preset minimum change rate.

[0021] Optionally, the timer satisfying the preset timing condition means at least that the current timer time is not less than the preset timing threshold.

[0022] Optionally, the fact that the current AMT input shaft speed and the engine target speed satisfy the fault determination condition means at least that the absolute value of the speed difference obtained by subtracting the engine target speed from the current AMT input shaft speed is greater than a preset maximum speed difference.

[0023] Optionally, after step S3, at least the following steps are also included:

[0024] When the current AMT input shaft speed and the engine target speed do not meet the fault determination conditions, it is determined that the downshift clutch speed adjustment is normal.

[0025] Based on the same concept, in a second aspect, the present invention also provides an AMT downshift fault diagnosis device for performing the AMT downshift fault diagnosis method described in any one of the first aspects;

[0026] The AMT downshift fault diagnosis device includes at least:

[0027] The speed calculation module is used to sequentially control the engine to reduce torque and disengage the clutch, shift the AMT main gearbox to neutral, shift the AMT front and rear auxiliary gearboxes, and then control the clutch to engage to the target position and obtain the AMT output shaft speed in order to calculate the engine target speed.

[0028] The rate of change calculation module is used to obtain the actual engine speed and then calculate the AMT input shaft speed change rate when the target engine speed and the actual engine speed meet the preset speed conditions.

[0029] The rotational speed acquisition module is used to start a timer when the rate of change of the AMT input shaft speed meets a preset rate of change condition, and to acquire the current AMT input shaft speed when the timer meets a preset timing condition.

[0030] The fault determination module is used to determine a downshift clutch speed regulation fault when the current AMT input shaft speed and the engine target speed meet the fault determination conditions.

[0031] Based on the same concept, in a third aspect, the present invention also provides an electronic device, including a memory and a processor, the memory storing a computer program executable on the processor, wherein the processor, when executing the program, implements the steps in the AMT downshift fault diagnosis method of any one of the first aspects.

[0032] Based on the same concept, in a fourth aspect, the present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps in the AMT downshift fault diagnosis method of any one of the first aspects.

[0033] The technical solution provided by this invention firstly controls the engine to reduce torque and disengage the clutch, then sequentially shifts the AMT master gearbox to neutral, and then shifts the AMT front and rear auxiliary gearboxes. Next, it controls the clutch to engage to the target position and acquires the AMT output shaft speed to calculate the engine target speed. Further, it acquires the actual engine speed, and then calculates the AMT input shaft speed change rate when the engine target speed and the actual engine speed meet a preset speed condition. Further, when the AMT input shaft speed change rate meets a preset change rate condition, a timer is started, and when the timer meets a preset timing condition, the current AMT input shaft speed is acquired. Finally, when the current AMT input shaft speed and the engine target speed meet a fault determination condition, a downshift clutch speed regulation fault is identified. Therefore, this invention can at least diagnose AMT downshift clutch speed regulation failure faults, achieving rapid fault location and improving maintenance efficiency. Attached Figure Description

[0034] Figure 1 This is a flowchart of an AMT downshift fault diagnosis method provided by an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the structure of an AMT downshift fault diagnosis device provided in an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention;

[0037] Figure 4 This is a flowchart of another AMT downshift fault diagnosis method provided in an embodiment of the present invention. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0039] It should be noted that any symbols and / or numbers present in the specification that are not marked in the accompanying drawings are not reference numerals.

[0040] Figure 1 This is a flowchart of an AMT downshift fault diagnosis method provided by an embodiment of the present invention. This embodiment is at least applicable to the diagnosis scenario of AMT downshift clutch speed regulation failure in any vehicle equipped with an AMT transmission. The AMT downshift fault diagnosis method can be, but is not limited to, executed by the AMT downshift fault diagnosis device in this embodiment of the present invention as the execution subject, and the execution subject can be implemented in software and / or hardware. Figure 1 As shown, this AMT downshift fault diagnosis method includes at least the following steps:

[0041] S1. Sequentially control the engine to reduce torque and disengage the clutch, shift the AMT main gearbox to neutral, shift the AMT front and rear auxiliary gearboxes, then control the clutch to engage to the target position and obtain the AMT output shaft speed to calculate the engine target speed.

[0042] Among them, engine torque reduction can be the reduction of engine torque to 0 torque; AMT master gearbox shifting to neutral can be the shifting of AMT master gearbox from gear (e.g., 1st gear) to neutral; AMT front and rear auxiliary gearbox shifting can be the switching between high and low gears by AMT front and rear auxiliary gearboxes.

[0043] In one specific implementation, step S1 may optionally include at least the following:

[0044] Controls engine torque reduction and clutch disengagement;

[0045] Determine whether engine torque reduction and clutch disengagement are complete;

[0046] When the engine torque reduction and clutch disengagement are complete, control the AMT master gearbox to shift to neutral.

[0047] Determine if the AMT main unit has completed the neutral disengagement process;

[0048] When the AMT main gearbox is disengaged from neutral, control the shifting of the AMT front and rear auxiliary gearboxes;

[0049] Determine whether the shifting of the front and rear auxiliary gearboxes of the AMT is complete;

[0050] When the AMT front and rear auxiliary gearboxes complete shifting, the clutches are controlled to engage at least at a preset slope (i.e., preset engagement rate) to the target position and the AMT output shaft speed is obtained. Then, the engine target speed is calculated based at least on the AMT output shaft speed and the target gear ratio.

[0051] S2. Obtain the actual engine speed, and then calculate the AMT input shaft speed change rate when the target engine speed and the actual engine speed meet the preset speed conditions.

[0052] The actual engine speed can be obtained from the engine controller via the CAN bus.

[0053] In another specific implementation, optionally, the condition that the engine target speed and the engine actual speed meet the preset speed condition means at least that the engine actual speed is not less than the difference between the engine target speed and the preset speed.

[0054] S3. When the rate of change of the AMT input shaft speed meets the preset rate of change condition, start the timer, and when the timer meets the preset timing condition, obtain the current AMT input shaft speed.

[0055] The preset rate of change condition and preset timing condition can be adapted to the actual vehicle use, and the present invention does not limit them.

[0056] In another specific implementation, optionally, the AMT input shaft speed change rate satisfies the preset change rate condition at least if the AMT input shaft speed change rate is not greater than the preset minimum change rate.

[0057] In another specific implementation, optionally, the timer satisfies the preset timing condition by at least the current timer time being not less than the preset timing threshold.

[0058] S4. When the current AMT input shaft speed and engine target speed meet the fault judgment conditions, the downshift clutch speed regulation fault is determined.

[0059] The fault determination conditions can also be adapted to the actual vehicle use, and this invention does not impose any restrictions on this.

[0060] In another specific implementation, optionally, the current AMT input shaft speed and engine target speed satisfying the fault determination condition means at least that the absolute value of the speed difference obtained by subtracting the engine target speed from the current AMT input shaft speed is greater than the preset maximum speed difference.

[0061] In yet another specific implementation, optionally, after step S3, at least the following is included:

[0062] If the current AMT input shaft speed and engine target speed do not meet the fault judgment conditions, it is determined that the downshift clutch speed adjustment is normal.

[0063] For example, Figure 4 This is a flowchart of another AMT downshift fault diagnosis method provided by an embodiment of the present invention, see [link]. Figure 4 At the beginning, control the engine to reduce torque and disengage the clutch, and determine whether the engine torque reduction and clutch disengagement are complete. If the engine torque reduction and clutch disengagement are not complete, continue to control the engine torque reduction and clutch disengagement until they are complete. Otherwise, if the engine torque reduction and clutch disengagement are complete, proceed to the next step.

[0064] Control the AMT main box to switch off to neutral and determine whether the switch-off is complete. If the switch-off is not complete, continue controlling the AMT main box to switch off to neutral until it is complete. Conversely, if the switch-off is complete, proceed to the next step.

[0065] Control the shifting of the AMT front and rear auxiliary gearboxes, and determine whether the shifting of the AMT front and rear auxiliary gearboxes is complete; if the shifting of the AMT front and rear auxiliary gearboxes is not complete, continue to control the shifting of the AMT front and rear auxiliary gearboxes until the shifting of the AMT front and rear auxiliary gearboxes is complete; conversely, if the shifting of the AMT front and rear auxiliary gearboxes is complete, proceed to the next step.

[0066] The clutch is controlled to engage at the target position Yt with a preset slope K; the target position Yt can be obtained by querying a preset calibration table based on the current speed difference Dslip and the target gear DG; the current speed difference Dslip can be calculated based on the AMT output shaft speed Nout, the AMT input shaft speed Nin, and the target gear ratio Ratio; the target gear DG can be calculated by the internal software of the AMT controller.

[0067] The AMT output shaft speed Nout can be obtained from the output shaft speed sensor.

[0068] The target engine speed Net = Nout × Ratio is calculated based on the AMT output shaft speed Nout and the target gear ratio Ratio; the target gear ratio Ratio can be obtained by querying the calibration table based on the target gear DG.

[0069] Obtain the actual engine speed Ne;

[0070] Determine the relationship between the actual engine speed Ne and the difference between the engine target speed Net and the preset speed deviation ΔNe [i.e., (Net-ΔNe)]. If Ne is less than (Net-ΔNe), continue to obtain the actual engine speed Ne until Ne is greater than or equal to (Net-ΔNe). If Ne is greater than or equal to (Net-ΔNe), proceed to the next step. The preset speed deviation ΔNe can be obtained by consulting the calibration table based on the actual engine speed.

[0071] The AMT input shaft speed Nin can be obtained from the input shaft speed sensor.

[0072] Calculate the AMT input shaft speed change rate dn; the AMT input shaft speed change rate can be calculated from the change of AMT input shaft speed within any time period;

[0073] Determine the relationship between the AMT input shaft speed change rate and the preset minimum change rate dnmin; if the AMT input shaft speed change rate is greater than the preset minimum change rate dnmin, continue calculating the AMT input shaft speed change rate dn until the AMT input shaft speed change rate dn is less than or equal to the preset minimum change rate dnmin; if the AMT input shaft speed change rate is less than or equal to the preset minimum change rate dnmin, proceed to the next step; the preset minimum change rate dnmin can be obtained by looking up a table based on the clutch target position Yt.

[0074] Start the timer and get the current timer time t;

[0075] Determine the relationship between the current timer time t and the preset timer threshold t1. If the current timer time t is less than the preset timer threshold t1, continue to acquire the timer time until the current timer time t is greater than or equal to the preset timer threshold t1. If the current timer time t is greater than or equal to the preset timer threshold t1, proceed to the next step. The preset timer threshold t1 can be obtained by looking up a table based on the difference between the current gear CG and the target gear DG (e.g., CG-DG).

[0076] Obtain the current AMT input shaft speed Nin1; the current AMT input shaft speed Nin1 can still be obtained through the input shaft speed sensor;

[0077] Determine the relationship between the absolute value of the speed difference obtained by subtracting the engine target speed Net from the current AMT input shaft speed Nin1 (i.e., |Nin1-Net|) and the preset maximum speed difference Δmax; if |Nin1-Net| is less than or equal to the preset maximum speed difference Δmax, then downshifting speed regulation is determined to be normal; if |Nin1-Net| is greater than the preset maximum speed difference Δmax, then downshifting clutch speed regulation failure is determined to be faulty.

[0078] The technical solution provided in this embodiment firstly controls the engine to reduce torque and disengage the clutch, then sequentially shifts the AMT master gearbox to neutral, and then shifts the AMT front and rear auxiliary gearboxes. Next, it controls the clutch to engage to the target position and acquires the AMT output shaft speed to calculate the engine target speed. Further, it acquires the actual engine speed, and then calculates the AMT input shaft speed change rate when the engine target speed and the actual engine speed meet a preset speed condition. Further, when the AMT input shaft speed change rate meets a preset change rate condition, a timer is started, and when the timer meets a preset timing condition, the current AMT input shaft speed is acquired. Finally, when the current AMT input shaft speed and the engine target speed meet the fault determination conditions, a downshift clutch speed regulation fault is identified. Therefore, this embodiment can at least diagnose AMT downshift clutch speed regulation failure faults, achieving rapid fault location and improving maintenance efficiency.

[0079] It should be noted that, on the one hand, this invention can identify the initial moment of a fault by judging the relationship between the AMT input shaft speed change rate and the preset minimum change rate dnmin; furthermore, by judging the relationship between the absolute value of the speed difference obtained by subtracting the engine target speed from the AMT input shaft speed and the preset maximum speed difference Δmax, it can determine whether downshifting speed regulation is normal or downshifting clutch speed regulation failure, thus realizing the confirmation of downshifting clutch speed regulation failure faults, improving the accuracy of downshifting clutch speed regulation failure fault diagnosis, filling the gap in the existing related technologies for the diagnosis of AMT downshifting clutch speed regulation failure faults, enabling rapid fault location, and improving maintenance efficiency.

[0080] On the other hand, by calculating the engine target speed and obtaining the engine actual speed, the present invention determines the relationship between the engine actual speed and the difference obtained by subtracting the preset speed deviation from the engine target speed, thereby eliminating the interference of engine speed adjustment failure on fault diagnosis and making the diagnosis results more reliable.

[0081] On the other hand, after determining that the AMT input shaft speed change rate is less than or equal to the preset minimum change rate, the present invention can extend the time period (achieved through the aforementioned timer) to eliminate misjudgments caused by errors in the calculation of the AMT input shaft speed change rate, thus helping to ensure the accuracy of clutch speed regulation failure fault diagnosis.

[0082] Figure 2 This is a schematic diagram of an AMT downshift fault diagnosis device provided in an embodiment of the present invention. This embodiment is at least applicable to the diagnosis of AMT downshift clutch speed regulation failure in any vehicle equipped with an AMT transmission. This AMT downshift fault diagnosis device can be implemented in software and / or hardware. Figure 2 As shown, the AMT downshift fault diagnosis device includes at least:

[0083] The speed calculation module 110 is used to sequentially control the engine to reduce torque and disengage the clutch, shift the AMT main gearbox to neutral, shift the AMT front and rear auxiliary gearboxes, and then control the clutch to engage to the target position and obtain the AMT output shaft speed in order to calculate the engine target speed.

[0084] The rate of change calculation module 120 is used to obtain the actual engine speed and then calculate the rate of change of the AMT input shaft speed when the target engine speed and the actual engine speed meet the preset speed conditions.

[0085] The speed acquisition module 130 is used to start a timer when the rate of change of the AMT input shaft speed meets a preset rate of change condition, and to acquire the current AMT input shaft speed when the timer meets a preset timing condition.

[0086] The fault determination module 140 is used to determine a downshift clutch speed regulation fault when the current AMT input shaft speed and the engine target speed meet the fault determination conditions.

[0087] Optionally, the speed calculation module 110 is specifically used for at least:

[0088] Controls engine torque reduction and clutch disengagement;

[0089] Determine whether engine torque reduction and clutch disengagement are complete;

[0090] When the engine torque reduction and clutch disengagement are complete, control the AMT master gearbox to shift to neutral.

[0091] Determine if the AMT main unit has completed the neutral disengagement process;

[0092] When the AMT main gearbox is disengaged from neutral, control the shifting of the AMT front and rear auxiliary gearboxes;

[0093] Determine whether the shifting of the front and rear auxiliary gearboxes of the AMT is complete;

[0094] When the AMT front and rear auxiliary gearboxes complete shifting, the clutch is controlled to engage at least at a preset slope to the target position and the AMT output shaft speed is obtained. Then, the engine target speed is calculated based at least on the AMT output shaft speed and the target gear ratio.

[0095] Optionally, for the target engine speed and the actual engine speed to meet the preset speed condition, the actual engine speed must be no less than the difference between the target engine speed and the preset speed.

[0096] Optionally, the AMT input shaft speed change rate satisfying the preset change rate condition means at least that the AMT input shaft speed change rate is not greater than the preset minimum change rate.

[0097] Optionally, the timer meeting the preset timing conditions means at least that the current timer time is not less than the preset timing threshold.

[0098] Optionally, the current AMT input shaft speed and engine target speed satisfying the fault determination condition means at least that the absolute value of the speed difference obtained by subtracting the engine target speed from the current AMT input shaft speed is greater than the preset maximum speed difference.

[0099] Optionally, the fault determination module 140 is also used for at least:

[0100] If the current AMT input shaft speed and engine target speed do not meet the fault judgment conditions, it is determined that the downshift clutch speed adjustment is normal.

[0101] The technical solution provided by this invention firstly controls the engine to reduce torque and disengage the clutch, shifts the AMT main gearbox to neutral, and then shifts the AMT front and rear auxiliary gearboxes sequentially through a speed calculation module. Next, it controls the clutch to engage to the target position and acquires the AMT output shaft speed to calculate the engine target speed. Further, it acquires the actual engine speed through a rate-of-change calculation module, and then calculates the AMT input shaft speed change rate when the engine target speed and the actual engine speed meet a preset speed condition. Further, when the AMT input shaft speed change rate meets the preset change rate condition, a timer is started through a speed acquisition module, and the current AMT input shaft speed is acquired when the timer meets a preset timing condition. Finally, when the current AMT input shaft speed and the engine target speed meet the fault determination condition, a fault determination module determines a downshift clutch speed regulation failure. Therefore, this invention can at least diagnose AMT downshift clutch speed regulation failure faults, achieving rapid fault location and improving maintenance efficiency.

[0102] This embodiment provides an electronic device. Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. See also: Figure 3The electronic device 1000 includes a processor 1001 and a memory 1002. The memory 1002 stores computer-readable instructions. When the computer-readable instructions are executed by the processor 1001, the steps in any of the above AMT downshift fault diagnosis methods are performed. Through the above technical solution, the processor 1001 and the memory 1002 are interconnected and communicate with each other through a communication bus and / or other forms of connection mechanism (not shown). The memory 1002 stores a computer program that can be executed by the processor. When the electronic device 1000 is running, the processor 1001 executes the computer program to perform the AMT downshift fault diagnosis method in any optional implementation of the above embodiments, so as to achieve at least the following functions: sequentially controlling the engine to reduce torque and disengage the clutch, shifting the AMT master gearbox to neutral, shifting the AMT front and rear auxiliary gearboxes, then controlling the clutch to engage to the target position and obtaining the AMT output shaft speed to calculate the engine target speed; obtaining the actual engine speed, and then calculating the AMT input shaft speed change rate when the engine target speed and the engine actual speed meet the preset speed conditions; when the AMT input shaft speed change rate meets the preset change rate conditions, starting the timer, and obtaining the current AMT input shaft speed when the timer meets the preset timing conditions; when the current AMT input shaft speed and the engine target speed meet the fault judgment conditions, determining a downshift clutch speed regulation fault.

[0103] This embodiment provides a computer-readable storage medium storing a computer program. When executed by a processor, the program implements the AMT downshift fault diagnosis method provided in all embodiments of the present invention: sequentially controlling engine torque reduction and clutch disengagement, shifting the AMT master gearbox to neutral, shifting the AMT front and rear auxiliary gearboxes, then controlling the clutch to engage to the target position and acquiring the AMT output shaft speed to calculate the engine target speed; acquiring the actual engine speed, and then calculating the AMT input shaft speed change rate when the engine target speed and the engine actual speed meet a preset speed condition; when the AMT input shaft speed change rate meets a preset change rate condition, starting a timer, and acquiring the current AMT input shaft speed when the timer meets a preset timing condition; when the current AMT input shaft speed and the engine target speed meet the fault determination condition, determining a downshift clutch speed regulation fault.

[0104] Any combination of one or more computer-readable media may be used. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.

[0105] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including—but not limited to—electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of transmitting, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0106] The program code contained on a computer-readable medium may be transmitted using any suitable medium, including—but not limited to—wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0107] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof. Programming languages ​​include object-oriented programming languages—such as Java, Smalltalk, and C++—as well as conventional procedural programming languages—such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An AMT downshift failure diagnosis method characterized by comprising: At least including: S1. Sequentially control the engine to reduce torque and disengage the clutch, shift the AMT main gearbox to neutral, shift the AMT front and rear auxiliary gearboxes, and then control the clutch to engage to the target position and obtain the AMT output shaft speed to calculate the engine target speed. S2. Obtain the actual engine speed, and then calculate the AMT input shaft speed change rate when the target engine speed and the actual engine speed meet the preset speed conditions. S3. When the rate of change of the AMT input shaft speed meets the preset rate of change condition, start the timer, and when the timer meets the preset timing condition, obtain the current AMT input shaft speed. S4. When the current AMT input shaft speed and the engine target speed meet the fault determination conditions, a downshift clutch speed regulation fault is determined.

2. The AMT downshift fault diagnosis method according to claim 1, characterized in that, Step S1 specifically includes at least the following: Control the engine to reduce torque and the clutch to disengage; Determine whether the engine torque reduction and clutch disengagement are complete; When the engine torque reduction and clutch disengagement are completed, the AMT master gearbox is switched to neutral. Determine whether the AMT main box has completed the neutral disengagement process; When the AMT main gearbox is in neutral, control the AMT front and rear auxiliary gearboxes to shift gears. Determine whether the shifting of the AMT front and rear auxiliary gearboxes is complete; When the AMT front and rear auxiliary gearboxes complete shifting, the clutches are controlled to engage at least at a preset slope to the target position and the AMT output shaft speed is obtained. Then, the engine target speed is calculated at least based on the AMT output shaft speed and the target gear ratio.

3. The AMT downshift fault diagnosis method according to claim 1, characterized in that, The condition that the engine target speed and the engine actual speed meet the preset speed condition means at least that the engine actual speed is not less than the difference between the engine target speed and the preset speed.

4. The AMT downshift fault diagnosis method according to claim 1, characterized in that, The AMT input shaft speed change rate satisfying the preset change rate condition means at least that the AMT input shaft speed change rate is not greater than the preset minimum change rate.

5. The AMT downshift fault diagnosis method according to claim 1, characterized in that, The timer meeting the preset timing condition means at least that the current timer time is not less than the preset timing threshold.

6. The AMT downshift fault diagnosis method according to claim 1, characterized in that, The condition that the current AMT input shaft speed and the engine target speed satisfy the fault determination criteria means that the absolute value of the speed difference obtained by subtracting the engine target speed from the current AMT input shaft speed is greater than the preset maximum speed difference.

7. The AMT downshift fault diagnosis method according to claim 1, characterized in that, After step S3, at least the following is also included: When the current AMT input shaft speed and the engine target speed do not meet the fault determination conditions, it is determined that the downshift clutch speed adjustment is normal.

8. An AMT downshift fault diagnosis device, characterized in that, Used to perform the AMT downshift fault diagnosis method according to any one of claims 1-7; The AMT downshift fault diagnosis device includes at least: The speed calculation module is used to sequentially control the engine to reduce torque and disengage the clutch, shift the AMT main gearbox to neutral, shift the AMT front and rear auxiliary gearboxes, and then control the clutch to engage to the target position and obtain the AMT output shaft speed in order to calculate the engine target speed. The rate of change calculation module is used to obtain the actual engine speed and then calculate the AMT input shaft speed change rate when the target engine speed and the actual engine speed meet the preset speed conditions. The rotational speed acquisition module is used to start a timer when the rate of change of the AMT input shaft speed meets a preset rate of change condition, and to acquire the current AMT input shaft speed when the timer meets a preset timing condition. The fault determination module is used to determine a downshift clutch speed regulation fault when the current AMT input shaft speed and the engine target speed meet the fault determination conditions.

9. An electronic device comprising a memory and a processor, the memory storing a computer program executable on the processor, characterized in that, When the processor executes the program, it implements the steps in the AMT downshift fault diagnosis method according to any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps in the AMT downshift fault diagnosis method according to any one of claims 1-7.

Images