Transmission wheel speed direction validity diagnosis and vehicle speed direction judgment method, system, electronic device and storage medium

Abstract

The present invention proposes a method, system, electronic device, and storage medium for diagnosing the validity of a transmission wheel speed direction and determining the vehicle speed direction. The method includes: when the vehicle begins driving and the vehicle speed exceeds a preset value, the wheel speed direction validity diagnosis is activated, and four wheel speed direction signals sent by the vehicle's CAN network ESC module are received in real time; the vehicle's travel direction is determined by the sum of the four wheel speed direction signals; if the wheel speed direction signal fails during dynamic driving, the vehicle does not enter a fault mode to disconnect the vehicle's power output, but waits for the failure to persist for a period of time before reporting a fault and disconnecting the vehicle's power output; when the wheel speed direction signal fails, the initial gear position is D / M / S and the vehicle speed direction is forward; when the initial gear position is R, the vehicle speed direction is reverse; and when the initial gear position is N, the vehicle speed direction is 0. The present invention optimizes the validity diagnosis of the wheel speed direction signals of a dual-clutch automatic transmission by optimizing the transmission control strategy.

Description

Technical Field

[0001] The present invention belongs to the field of automobiles, and in particular relates to a method and system for diagnosing the effectiveness of a gearbox wheel speed direction and determining a vehicle speed direction. Background Art

[0002] Dual Clutch Transmission (DCT) combines the advantages of manual transmission (MT) and hydraulic automatic transmission (AT). It has high transmission efficiency and simple structure. It not only improves the vehicle's power and economy, but also greatly improves the vehicle's driving comfort.

[0003] The diagnostic system ensures that when a vehicle's transmission system malfunctions or fails, the system can reasonably and effectively diagnose the corresponding fault and take appropriate measures to address the fault, ensuring the safety of passengers and the vehicle, and ensuring that the vehicle meets national regulations and design requirements. The automatic transmission diagnostic system includes four major components: sensor diagnosis, CAN signal diagnosis, actuator diagnosis, and functional module diagnosis. Many wet dual-clutch transmissions on the market currently lack output shaft speed and direction sensors, but the vehicle speed and direction signal is an indispensable and critical signal in transmission control, and is heavily dependent on the wheel speed and direction signal from the ESC module. Therefore, diagnosing the validity of the wheel speed and direction signal is extremely important. Wheel speed and direction validity diagnosis is a CAN signal diagnosis.

[0004] Technical solutions of existing technology:

[0005] At present, the TCU of a wet dual-clutch transmission confirms whether the vehicle's speed direction is forward or reverse by identifying the average of the vehicle's two rear wheel speed direction signals and whether the average is positive or negative. If the rear wheel speed direction signal is invalid, the front wheel speed direction signal is used instead. When all four wheel speed direction signals fail, the vehicle speed direction signal is no longer sent, and the transmission disengages the clutch to interrupt the vehicle's power output. After at least two wheel speed direction signals return to normal, the TCU restarts once (achieved by powering off the vehicle), and the vehicle will return to normal. The four wheel speed direction validity diagnoses are all independent diagnoses. The four wheel speed direction signals correspond to the validity of the four wheel speed directions respectively. The diagnostic logic is as follows: Figure 2 As shown, (taking the validity diagnosis of the left rear wheel speed direction signal WhlSpdReLeDir as an example):

[0006] Figure 2In the figure, WhlSpdReLeDir is the vehicle's left rear wheel speed direction signal, WhlSpdReLeDirVld is the vehicle's left rear wheel speed direction validity signal, and the two independent identification conditions for determining that the wheel speed direction signal is invalid are WhlSpdReLeDir=0 and WhlSpdReLeDirVld=invaild, time is the monitoring time, and TiDebForWhlSpdReLeDirChk_C is the duration for determining that the wheel speed direction signal is invalid.

[0007] Disadvantages of existing technology:

[0008] The existing wheel speed direction signal validity fault diagnosis method has the following defects:

[0009] 1. Setting up a separate validity diagnosis for each wheel speed direction signal is somewhat cumbersome and the method for deriving the final vehicle speed direction is relatively simple, resulting in poor reliability under special operating conditions.

[0010] 2. When the rear wheel speed and direction signal fails, the redundancy solution uses the front wheel speed and direction signal on the same side as the rear wheel. This substitute value is not representative of the vehicle's speed and direction, and can easily lead to incorrect speed and direction recognition in conditions such as slipping and sliding.

[0011] 3. If all four wheel speed direction signals fail during driving, a fault will be directly reported and the power output will be interrupted. The fault measures are set unreasonably and do not allow the dynamic process to recover. Summary of the Invention

[0012] In order to solve the above technical problems, the present invention proposes a technical solution of a transmission wheel speed direction validity diagnosis and vehicle speed direction judgment method, system, electronic equipment and storage medium to solve the above technical problems.

[0013] A first aspect of the present invention discloses a method for diagnosing the effectiveness of a gearbox wheel speed direction and determining a vehicle speed direction, the method comprising:

[0014] Step S1: When the vehicle starts to move and the speed exceeds a preset value, the wheel speed and direction validity diagnosis is activated, and four wheel speed and direction signals sent by the vehicle CAN network ESC module are received in real time;

[0015] Step S2: Determine the vehicle's travel direction based on the sum of the four wheel speed direction signals; a single wheel speed direction is 1 for forward movement, -1 for reverse movement, and 0 for failure.

[0016] According to the method of the first aspect of the present invention, the added value of -1 / 0 / 1 represents that the vehicle speed direction calculated by the wheel speed direction signal is no longer credible and is considered a failure;

[0017] The sum value is greater than or equal to 2, indicating that at least two wheel speed signals are available and the vehicle speed direction is forward;

[0018] The added value being less than or equal to -2 represents that at least two wheel speed signals are available, and the vehicle speed direction is reverse.

[0019] According to the method of the first aspect of the present invention, in step S2, if the wheel speed direction signal fails during dynamic driving, the vehicle does not immediately enter the fault mode to disconnect the power output of the entire vehicle. Instead, the fault is reported and the power output of the entire vehicle is disconnected after the failure continues for a period of time.

[0020] According to the method of the first aspect of the present invention, in the step S2, the fault mode is not immediately entered to disconnect the power output of the whole vehicle, but the fault is reported only after the failure fault continues for a period of time. The specific method of disconnecting the power output of the whole vehicle includes not immediately entering the fault mode to disconnect the power output of the whole vehicle, but using the current driving gear to determine the vehicle speed direction. After the vehicle speed drops below the preset value, the wheel speed direction signal continues to fail within a period of Debounce time before reporting the fault and disconnecting the power output of the whole vehicle.

[0021] According to the method of the first aspect of the present invention, in step S2, when the wheel speed direction signal fails during the dynamic driving process and does not meet the fault reporting conditions, that is, after the vehicle speed drops below the preset value, the wheel speed direction signal that continues to be monitored is allowed to recover within a debounce time, and after the sum of the wheel speed direction signals recovers to a value other than 1 / 0 / -1 and lasts for a debounce time, the vehicle speed direction is re-determined based on the wheel speed direction signal.

[0022] According to the method of the first aspect of the present invention, in step S2, when the wheel speed direction signal fails, the method of determining the vehicle speed direction based on the gear signal includes: when the initial gear is D / M / S, the vehicle speed direction is forward; when the initial gear is R, the vehicle speed direction is reverse; when the initial gear is N, the vehicle speed direction is 0, that is, no direction.

[0023] A second aspect of the present invention discloses a transmission wheel speed direction validity diagnosis and vehicle speed direction determination system, the system comprising:

[0024] The first processing module is configured to activate the wheel speed direction validity diagnosis when the vehicle starts to move and the vehicle speed exceeds a preset value, and receive four wheel speed direction signals sent by the ESC module of the vehicle CAN network in real time;

[0025] The second processing module is configured to determine the vehicle's moving direction based on the sum of the four wheel speed direction signals; the forward direction of a single wheel speed is 1, the backward direction is -1, and the failure direction is 0.

[0026] A third aspect of the present invention discloses an electronic device comprising a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the steps of any one of the methods for diagnosing the effectiveness of a transmission wheel speed direction and determining a vehicle speed direction according to the first aspect of the present disclosure.

[0027] A fourth aspect of the present invention discloses a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any one of the methods for diagnosing transmission wheel speed direction validity and determining vehicle speed direction according to the first aspect of the present disclosure.

[0028] The solution proposed in the present invention optimizes the effectiveness diagnosis of the wheel speed direction signal of the dual-clutch automatic transmission by optimizing the transmission control strategy without changing the transmission hardware structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 Flowchart of a method for diagnosing the effectiveness of a gearbox wheel speed direction and determining a vehicle speed direction according to an embodiment of the present invention;

[0031] Figure 2 A left rear wheel speed direction signal validity diagnosis control logic diagram according to background technology;

[0032] Figure 3 Schematic diagram of the optimized wheel speed direction validity diagnosis technology solution according to an embodiment of the present invention;

[0033] Figure 4 2. It is a structural diagram of a transmission wheel speed direction validity diagnosis and vehicle speed direction judgment system according to an embodiment of the present invention;

[0034] Figure 5 FIG. 4 is a structural diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0036] A first aspect of the present invention discloses a method for diagnosing the effectiveness of a gearbox wheel speed direction and determining a vehicle speed direction. Figure 1 FIG. 1 is a flow chart of a method for diagnosing the effectiveness of a transmission wheel speed direction and determining a vehicle speed direction according to an embodiment of the present invention. Figure 1 and Figure 2 As shown, the method includes:

[0037] Step S1: When the vehicle starts to move and the speed exceeds a preset value, the wheel speed and direction validity diagnosis is activated, and four wheel speed and direction signals sent by the vehicle CAN network ESC module are received in real time;

[0038] Step S2: Determine the vehicle's travel direction based on the sum of the four wheel speed direction signals; a single wheel speed direction is 1 for forward movement, -1 for backward movement, and 0 for failure.

[0039] In step S1, when the vehicle starts to move and the speed exceeds a preset value, the wheel speed direction validity diagnosis is activated and four wheel speed direction signals sent by the ESC module of the vehicle CAN network are received in real time.

[0040] Specifically, when the vehicle starts moving and the speed exceeds 5 km / h, the wheel speed direction validity diagnosis is activated, and the four wheel speed direction signals sent by the ESC module of the vehicle CAN network are received in real time.

[0041] In step S2, the direction of travel of the entire vehicle is determined by the sum of the four wheel speed direction signals; the forward direction of a single wheel speed is 1, the reverse direction is -1, and the failure direction is 0.

[0042] In some embodiments, in step S2, the method of determining the vehicle's traveling direction based on the sum of the four wheel speed direction signals includes:

[0043] The added value of -1 / 0 / 1 indicates that the vehicle speed direction calculated from the wheel speed direction signal is no longer credible and is considered a failure.

[0044] The sum value is greater than or equal to 2, indicating that at least two wheel speed signals are available and the vehicle speed direction is forward;

[0045] The added value being less than or equal to -2 represents that at least two wheel speed signals are available, and the vehicle speed direction is reverse.

[0046] If the wheel speed direction signal fails during dynamic driving, the system does not immediately enter fault mode to disconnect the vehicle power output. Instead, it uses the current driving gear to determine the vehicle speed direction. After the vehicle speed drops below 5 km / h, the wheel speed direction signal continues to fail within a period of debounce before reporting a fault and disconnecting the vehicle power output. Disconnecting the vehicle power output can avoid sudden power interruption during dynamic driving. Figure 3 shown.

[0047] When the wheel speed direction signal fails during dynamic driving and does not meet the fault reporting conditions, that is, after the vehicle speed drops below the preset value, the wheel speed direction signal that continues to be monitored is allowed to recover within a period of Debounce time. After the sum of the wheel speed direction signals recovers to a value other than 1 / 0 / -1 and lasts for a period of Debounce time, the vehicle speed direction is re-determined based on the wheel speed direction signal. No fault is reported even after the vehicle speed drops to 5 km / h, thereby avoiding false fault alarms caused by occasional signal abnormalities.

[0048] Figure 2 In the figure, TiDebForVehDirChk_C is the debounce time for reporting a fault after the wheel speed direction signal fails, and TiRecForVehDirChk_C is the debounce time for the dynamic recovery process after the wheel speed direction signal fails.

[0049] When the wheel speed direction signal fails, the method for determining the vehicle speed direction based on the gear position signal includes:

[0050] When the initial gear position is D / M / S, the vehicle speed direction is forward;

[0051] When the initial gear position is R, the vehicle speed direction is backward;

[0052] When the initial gear position is N, the vehicle speed direction is 0, that is, no direction.

[0053] In summary, the solution proposed in the present invention can optimize the validity diagnosis of the wheel speed direction signal of the dual-clutch automatic transmission by optimizing the transmission control strategy without changing the transmission hardware structure.

[0054] A second aspect of the present invention discloses a transmission wheel speed direction validity diagnosis and vehicle speed direction judgment system. Figure 4 FIG. 1 is a structural diagram of a transmission wheel speed direction validity diagnosis and vehicle speed direction judgment system according to an embodiment of the present invention; Figure 4 As shown, the system 100 includes:

[0055] The first processing module 101 is configured to activate the wheel speed direction validity diagnosis when the vehicle starts to move and the vehicle speed exceeds a preset value, and receive four wheel speed direction signals sent by the ESC module of the vehicle CAN network in real time;

[0056] The second processing module 102 is configured to determine the vehicle's moving direction based on the sum of the four wheel speed direction signals; a single wheel speed direction is 1 for forward movement, -1 for backward movement, and 0 for failure.

[0057] A third aspect of the present invention discloses an electronic device. The electronic device includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the electronic device implements the steps of any one of the methods for diagnosing the effectiveness of a transmission wheel speed direction and determining a vehicle speed direction as disclosed in the first aspect of the present invention.

[0058] Figure 5 FIG. 1 is a structural diagram of an electronic device according to an embodiment of the present invention. Figure 5 As shown, the electronic device includes a processor, a memory, a communication interface, a display screen and an input device connected via a system bus. The processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the electronic device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, near field communication (NFC) or other technologies. The display screen of the electronic device can be a liquid crystal display or an electronic ink display screen, and the input device of the electronic device can be a touch layer covering the display screen, or a button, trackball or touchpad provided on the electronic device housing, or an external keyboard, touchpad or mouse.

[0059] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a structural diagram of the part related to the technical solution of the present disclosure, and does not constitute a limitation on the electronic device to which the solution of the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0060] A fourth aspect of the present invention discloses a computer-readable storage medium having a computer program stored thereon. When executed by a processor, the computer program implements the steps of any one of the methods for diagnosing the effectiveness of a transmission wheel speed direction and determining a vehicle speed direction as disclosed in the first aspect of the present invention.

[0061] Please note that the technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. The above embodiments only express several implementation methods of the present application. The description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of this application, several variations and improvements can be made, which all fall within the scope of protection of this application. Therefore, the scope of protection of the patent in this application shall be based on the attached claims.

Claims

1. A method for diagnosing the effectiveness of a gearbox wheel speed direction and determining the vehicle speed direction, characterized in that: The method comprises: Step S1: When the vehicle starts to move and the speed exceeds a preset value, the wheel speed and direction validity diagnosis is activated, and four wheel speed and direction signals sent by the vehicle CAN network ESC module are received in real time; Step S2: Determine the vehicle's travel direction based on the sum of the four wheel speed direction signals; the forward direction of a single wheel speed is 1, the reverse direction is -1, and the failure direction is 0; In step S2, the method of determining the vehicle's traveling direction based on the sum of the four wheel speed direction signals includes: The added value of -1 / 0 / 1 indicates that the vehicle speed direction calculated from the wheel speed direction signal is no longer credible and is considered a failure. The sum value is greater than or equal to 2, indicating that at least two wheel speed signals are available and the vehicle speed direction is forward; The sum value is less than or equal to -2, indicating that at least two wheel speed signals are available and the vehicle speed direction is reverse; In step S2, if the wheel speed direction signal is a failure fault during dynamic driving, the vehicle does not immediately enter the failure mode to disconnect the vehicle power output, but waits for the failure fault to persist for a period of time before reporting the fault and disconnecting the vehicle power output; In step S2, the fault mode is not immediately entered to disconnect the vehicle power output, but the fault is reported only after the failure continues for a period of time. The specific method of disconnecting the vehicle power output includes not immediately entering the fault mode to disconnect the vehicle power output, but using the current driving gear to determine the vehicle speed direction. After the vehicle speed drops below the preset value, the wheel speed direction signal continues to fail within a debounce period before reporting the fault and disconnecting the vehicle power output. In step S2, when the wheel speed direction signal fails, the method of determining the vehicle speed direction based on the gear signal includes: when the initial gear is D / M / S, the vehicle speed direction is forward; when the initial gear is R, the vehicle speed direction is reverse; when the initial gear is N, the vehicle speed direction is 0, that is, no direction.

2. The method for diagnosing the effectiveness of a transmission wheel speed direction and determining the vehicle speed direction according to claim 1, characterized in that: In step S2, when the wheel speed direction signal fails during dynamic driving and does not meet the fault reporting conditions, that is, after the vehicle speed drops below the preset value, the wheel speed direction signal that is continued to be monitored is allowed to recover within a debounce period. After the sum of the wheel speed direction signals recovers to a value other than 1 / 0 / -1 and lasts for a debounce period, the vehicle speed direction is re-determined based on the wheel speed direction signal.

3. A gearbox wheel speed direction validity diagnosis and vehicle speed direction judgment system, the system adopts the method according to any one of claims 1-2, characterized in that: The system comprises: The first processing module is configured to activate the wheel speed direction validity diagnosis when the vehicle starts to move and the vehicle speed exceeds a preset value, and receive four wheel speed direction signals sent by the ESC module of the vehicle CAN network in real time; The second processing module is configured to determine the vehicle's moving direction based on the sum of the four wheel speed direction signals; the forward direction of a single wheel speed is 1, the backward direction is -1, and the failure direction is 0.

4. An electronic device, characterized in that: The electronic device includes a memory and a processor, the memory stores a computer program, and when the processor executes the computer program, the steps in the method for diagnosing the effectiveness of the transmission wheel speed direction and determining the vehicle speed direction according to any one of claims 1 to 2 are implemented.

5. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by the processor, the steps of the method for diagnosing the effectiveness of the transmission wheel speed direction and determining the vehicle speed direction according to any one of claims 1 to 2 are implemented.

Images