Signal processing method, mode switching method and device for vehicle four-wheel drive mode switching

Abstract

The present disclosure provides a signal processing method, a mode switching method and equipment for vehicle four-wheel drive mode switching. In response to receiving a four-wheel drive mode switching instruction, it is determined whether a target four-wheel drive switching signal is lost within a first preset time period. It is determined that the target four-wheel drive switching signal is lost within the first preset time period, and the state of the transmission gear is determined. According to the state of the transmission gear, the target recovery condition of the target four-wheel drive switching signal is determined. In response to the target four-wheel drive switching signal meeting the target recovery condition, the transmission gear is in neutral and the vehicle speed is less than a preset vehicle speed threshold, the transmission gear is locked in neutral. A gear locking signal is generated and output to the four-wheel drive control system, so that the four-wheel drive control system receives the gear locking signal and switches the four-wheel drive mode. Avoiding the problem that the mode cannot be switched due to signal interruption, causing user dissatisfaction.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of vehicle control, in particular to a signal processing method, a mode switching method and equipment for vehicle four-wheel drive mode switching. BACKGROUND

[0002] With the rapid development of the field of vehicle technology, vehicles have become an important means of transportation in people's daily life. Vehicles can switch between two-wheel drive mode, four-wheel drive mode and low-speed four-wheel drive mode during use.

[0003] When switching to four-wheel drive mode, it is necessary to ensure that the transmission is in neutral, the vehicle speed is less than a certain value, and the mode switching signal is continuously received, so as to realize the switching of four-wheel drive mode. If the signal is interrupted, the mode switching will fail, causing user dissatisfaction. SUMMARY

[0004] Therefore, the purpose of the present disclosure is to provide a signal processing method, a mode switching method and equipment for vehicle four-wheel drive mode switching, to solve the problem of signal interruption when switching to four-wheel drive mode, resulting in mode switching failure and user dissatisfaction.

[0005] To achieve the above purpose, the first aspect of the present disclosure provides a signal processing method for vehicle four-wheel drive mode switching, applied to a transmission controller, the method comprising:

[0006] In response to receiving a four-wheel drive mode switching instruction, it is determined whether there is a target four-wheel drive switching signal loss within a first preset time period;

[0007] It is determined that there is a target four-wheel drive switching signal loss within a first preset time period, and the transmission gear state is determined;

[0008] According to the transmission gear state, the target recovery condition of the target four-wheel drive switching signal is determined;

[0009] In response to the target four-wheel drive switching signal meeting the target recovery condition, and the transmission gear being in neutral and the vehicle speed being less than a preset vehicle speed threshold, the transmission gear is locked in neutral;

[0010] Generate and output a gear lock signal to the four-wheel drive control system, so that the four-wheel drive control system receives the gear lock signal and switches to four-wheel drive mode.

[0011] Based on the same inventive concept, the second aspect of the present disclosure provides a vehicle four-wheel drive mode switching method applied to a four-wheel drive control system, comprising:

[0012] Receiving the gear lock signal obtained by the signal processing method for vehicle four-wheel drive mode switching;

[0013] The control differential is controlled to switch the four-wheel drive mode.

[0014] Based on the same inventive concept, a third aspect of the present disclosure provides a signal processing device for four-wheel drive mode switching of a vehicle, which is arranged in a transmission controller and comprises:

[0015] The determination module is configured to determine, in response to receiving a four-wheel drive mode switching instruction, whether there is a target four-wheel drive switching signal loss within a first preset time period;

[0016] The receiving interrupt module is configured to determine that there is a target four-wheel drive switching signal loss within a first preset time period, and determine a transmission gear state;

[0017] The condition determination module is configured to determine a target recovery condition of the target four-wheel drive switching signal according to the transmission gear state;

[0018] The lock control module is configured to control the transmission gear to lock the neutral gear in response to the target four-wheel drive switching signal meeting the target recovery condition, and the transmission gear being the neutral gear and the vehicle speed being less than a preset vehicle speed threshold;

[0019] The signal generation module is configured to generate and output a gear lock signal to the four-wheel drive control system, so that the four-wheel drive control system switches the four-wheel drive mode after receiving the gear lock signal.

[0020] Based on the same inventive concept, a fourth aspect of the present disclosure provides a four-wheel drive mode switching device for a vehicle, which is arranged in a four-wheel drive control system and comprises:

[0021] The signal receiving module is configured to receive a gear lock signal obtained by the four-wheel drive mode switching device for a vehicle;

[0022] The switching module is configured to control the control differential to switch the four-wheel drive mode.

[0023] Based on the same inventive concept, a fifth aspect of the present disclosure provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable by the processor, wherein the processor implements the method described above when executing the computer program.

[0024] Based on the same inventive concept, a sixth aspect of the present disclosure provides a non-transitory computer readable storage medium, which stores computer instructions for causing a computer to execute the method described above.

[0025] Based on the same inventive concept, a seventh aspect of the present disclosure provides a vehicle comprising the four-wheel drive mode switching device of the second aspect, the electronic device of the third aspect, or the storage medium of the fourth aspect.

[0026] From the above, the present disclosure proposes a vehicle four-wheel drive mode switching signal processing method, mode switching method and device. When receiving the four-wheel drive mode switching instruction, it indicates that the user wants to switch to the four-wheel drive mode at this time. At this time, it is judged whether the target four-wheel drive switching signal is lost within the first preset time length. If the target four-wheel drive switching signal is lost, it means that the target four-wheel drive switching signal is interrupted. At this time, the transmission gear position state is judged, and the corresponding target recovery condition is determined based on the transmission gear position state. The target four-wheel drive switching signal is compared with the target recovery condition. If the preset recovery condition is met, and the transmission gear position is neutral and the vehicle speed is less than the preset vehicle speed threshold, the condition for switching the four-wheel drive mode is met at this time, and the four-wheel drive mode switching can be recovered. Avoiding the problem of user dissatisfaction caused by signal interruption and unable to switch mode. Control the transmission gear position to lock the neutral position, generate and output the gear position locking signal to the four-wheel drive control system, so that the four-wheel drive control system receives the gear position locking signal and switches the four-wheel drive mode. After locking the transmission gear position in the neutral position, the four-wheel drive mode is switched, effectively avoiding the problem of gear tooth in the process of switching the four-wheel drive mode at low speed due to the transmission switching to other gears, improving the reliability of the low-speed four-wheel drive function of the vehicle, and improving the driving experience of the user. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present disclosure or the related art, the following will briefly introduce the drawings needed to be used in the embodiments or related art descriptions. Obviously, the drawings in the following description are only embodiments of the present disclosure, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0028] Figure 1 It is a structure diagram of a transfer case;

[0029] Figure 2 It is a flowchart of the vehicle four-wheel drive mode switching signal processing method of the embodiment of the present disclosure;

[0030] Figure 3 It is a flowchart of the vehicle four-wheel drive mode switching method of the embodiment of the present disclosure;

[0031] Figure 4 It is a structure block diagram of the vehicle four-wheel drive mode switching signal processing device of the embodiment of the present disclosure;

[0032] Figure 5 It is a structure block diagram of the vehicle four-wheel drive mode switching device of the embodiment of the present disclosure;

[0033] Figure 6 It is a structure schematic diagram of the electronic device of the embodiment of the present disclosure. DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to specific embodiments and drawings.

[0035] It should be noted that, unless otherwise defined, technical terms or scientific terms used in the embodiments of the present disclosure should be understood as their common meanings to those skilled in the art to which the present disclosure pertains. The terms "first", "second" and similar terms used in the embodiments of the present disclosure do not denote any order, quantity or importance, but are merely used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are merely used to represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships can also be changed accordingly.

[0036] The terms involved in the present disclosure are explained as follows:

[0037] TCU: Transmission Control Unit (TCU).

[0038] BCM: Body Control Module (BCM) is an electronic control unit (ECU). The BCM is usually located inside the vehicle, behind the dashboard or under the seat. The BCM is responsible for driving, monitoring and controlling the electronic control units (ECUs) related to the body functions of the vehicle.

[0039] ESP: Electronic Stability Program (ESP) is a general term for systems or programs designed to improve vehicle handling performance while effectively preventing the vehicle from losing control when it reaches its dynamic limit.

[0040] CEM: Automobile Engine Control Module (ECM) is the core component of engine control. According to the input information of various sensors, it controls the fuel injection and ignition timing of the engine, and provides the best control instructions for other output devices.

[0041] 4L mode: low-speed four-wheel drive mode.

[0042] 4H mode: high-speed four-wheel drive mode.

[0043] AWD mode: All-wheel drive mode.

[0044] 2H mode: High-speed two-wheel drive mode.

[0045] 4WD: Four-wheel drive system, which means that both the front and rear wheels of a car are powered.

[0046] With the rapid development of vehicle technology, vehicles have become an important means of transportation in people's daily lives. During use, vehicles can switch between two-wheel drive, four-wheel drive, and low-speed four-wheel drive modes. The transfer case is a crucial transmission component for switching between these modes. Its main function is to distribute the power transmitted from the transmission to the front and rear drive shafts, and then transmit torque to all four wheels via the main reducer and drive shaft, thus achieving four-wheel drive.

[0047] like Figure 1 As shown, Figure 1 A structural diagram of a transfer case is shown. Inside the transfer case, the power output from the transmission passes through a high- and low-speed planetary gear set and is directly output to the rear axle driveshaft. Simultaneously, a set of multi-plate clutches is connected, and similarly, a set of multi-plate clutches is connected to the input end of the front axle. When not energized, the multi-plate clutches are unloaded and rotate independently; this is rear-wheel drive, 2H mode. When energized and fully loaded, the multi-plate clutches are attracted and pressed by the electromagnetic coil, and power is transmitted to the front axle through the engaged multi-plate clutches; this is four-wheel drive, 4H mode. If the transfer case is in low gear, it is 4L. When a speed difference is required between the front and rear axles, the transfer case control unit controls the on / off state of the electromagnetic coil, thereby controlling the engagement degree of the multi-plate clutches. The energization is in duty cycle form, from 0-100%. Relying on the slippage and partial engagement of the multi-plate clutches, the differential speed between the front and rear axles is achieved, and the slippage of the slipping axle can also be limited; all operations are controlled by the electromagnetic coil. The transfer case control unit monitors the transmission output shaft speed signal, wheel speed signal, determines differential demand and axle slippage, and the driver's commands to control the engagement degree of the electromagnetic coil multi-plate clutch, thereby achieving four-wheel drive control.

[0048] When switching to four-wheel drive mode, the transmission must be in neutral, the vehicle speed must be below a certain value, and the vehicle must continuously receive a mode change signal for the switch to work. If signal interruption or other issues occur, the mode switching will fail, leading to user dissatisfaction.

[0049] Meanwhile, the vehicle needs to reduce the vehicle speed and ensure that the transmission gear of the vehicle is switched to neutral when switching to the low-speed four-wheel drive mode. It takes about 4 seconds for the transfer to completely switch to the low-speed four-wheel drive mode, and if the customer directly switches the N gear to the travel D / R gear when the transfer is not completely switched in / out of the low-speed four-wheel drive mode, the low-speed four-wheel drive combination sleeve of the transfer will be toothed, the low-speed four-wheel drive function of the four-wheel drive will be lost, and finally the vehicle will have no low-speed four-wheel drive function, causing the user to complain.

[0050] Based on the above description, the embodiment provides a signal processing method for four-wheel drive mode switching of a vehicle, as shown in the method is applied to a transmission controller, and the method comprises the following steps of: Figure 2

[0051] In step 101, in response to receiving a four-wheel drive mode switching instruction, it is judged whether there is a target four-wheel drive switching signal loss within a first preset time length.

[0052] In specific implementation, when the four-wheel drive mode switching instruction of the user is received, it indicates that the user wants to switch the four-wheel drive mode. At this time, the four-wheel drive mode switching instruction is forwarded to the CEM through the LIN line, and then forwarded to the ESP or BCM through the CEM. The ESP or BCM outputs a four-wheel drive mode request signal, and the four-wheel drive system responds to the four-wheel drive mode request signal and performs gear shifting.

[0053] The transmission controller receives a target four-wheel drive switching signal and judges whether there is a target four-wheel drive switching signal loss within a first preset time length. The target four-wheel drive switching signal comprises at least one of a four-wheel drive system signal and a four-wheel drive mode request signal, and the four-wheel drive system signal comprises a four-wheel drive mode switching signal and a four-wheel drive system state signal.

[0054] In the embodiment, the four-wheel drive mode request signal is a signal sent by the BCM or the ESP. When the vehicle is a full terrain leading vehicle, the four-wheel drive mode request signal is a signal sent by the ESP, which is represented as DrivingModReq_ESP. When the four-wheel drive mode request signal is a signal sent by the BCM, it is represented as FourDrvModSwtReq.

[0055] The four-wheel drive system signal is a signal sent by the four-wheel drive system to the transmission controller, wherein the four-wheel drive mode switching signal is represented as ModeChangeInPro, and the four-wheel drive system state signal is represented as SystemOperMod.

[0056] In the embodiment, the user can input the four-wheel drive mode switching instruction through the virtual button or the physical button in the vehicle, wherein the position of the virtual button in the vehicle comprises at least one of the following: the door, the window, the central control screen, the co-pilot screen, the rear screen, etc.

[0057] ​Step 102, determine that the target four-wheel drive switching signal is lost within a first preset time length, and determine the gear state of the transmission.

[0058] In a specific implementation, the target four-wheel drive switching signal is lost within the first preset time length, which indicates that the target four-wheel drive switching signal is interrupted. Meanwhile, the gear state of the transmission is determined, that is, the gear state of the transmission when the target four-wheel drive switching signal is lost, where the gear state is a lock-up neutral gear or a non-lock-up neutral gear. In this embodiment, the first preset time length is 100 ms, and the frequency of the target four-wheel drive switching signal received by the transmission controller is 20 ms per frame.

[0059] For example, the target four-wheel drive switching signal is lost within 100 ms, which indicates that the target four-wheel drive switching signal is interrupted.

[0060] Step 103, determining the target recovery condition of the target four-wheel drive switching signal according to the gear state of the transmission.

[0061] In a specific implementation, the target recovery condition of the target four-wheel drive switching signal is determined according to the gear state of the transmission at the moment when the target four-wheel drive switching signal is lost. That is, the target recovery condition is different for different gear states of the transmission.

[0062] Step 104, in response to the target four-wheel drive switching signal meeting the target recovery condition, and the gear of the transmission being a neutral gear and the vehicle speed being less than a preset vehicle speed threshold, controlling the gear of the transmission to be a lock-up neutral gear.

[0063] In a specific implementation, it is determined whether the target four-wheel drive switching signal meets the target recovery condition. If the target four-wheel drive switching signal meets the target recovery condition, the gear of the transmission and the vehicle speed are obtained.

[0064] In response to the gear of the transmission being a neutral gear and the vehicle speed being less than a preset vehicle speed threshold, the condition for lock-up of the neutral gear is met, and the gear of the transmission is controlled to be a lock-up neutral gear. The target four-wheel drive switching signal meeting the target recovery condition, the gear of the transmission being a neutral gear, and the vehicle speed being less than a preset vehicle speed threshold all need to be met at the same time, and any one of them cannot be missing. If any condition is not met, the lock-up of the neutral gear is not performed.

[0065] When the gear of the transmission is a lock-up neutral gear, switching to other gears is not allowed. In this embodiment, the preset vehicle speed threshold is 4 km / h.

[0066] Step 105, generating and outputting a gear lock-up signal to the four-wheel drive control system, so that the four-wheel drive control system receives the gear lock-up signal and switches the four-wheel drive mode.

[0067] In specific implementation, after the transmission is locked in neutral, a gear lock signal is generated and sent to the four-wheel drive control system. After receiving the gear lock signal, the four-wheel drive control system controls the transfer to switch to the four-wheel drive mode.

[0068] In this embodiment, a gear shifting prompt information can be output to prompt the user to switch the current gear of the transmission to neutral. Specifically, the gear shifting prompt information can be sent to the instrument of the vehicle or the central control screen of the vehicle, and the gear shifting prompt information is displayed through the instrument or the central control screen of the vehicle.

[0069] Through the above scheme, when the four-wheel drive mode switching instruction is received, it indicates that the user wants to switch to the four-wheel drive mode at this time. At this time, it is judged whether there is a loss of the target four-wheel drive switching signal within the first preset time length. If there is a loss of the target four-wheel drive switching signal, it indicates that the reception of the target four-wheel drive switching signal is interrupted. At this time, the state of the transmission gear is judged, and the corresponding target recovery condition is determined based on the state of the transmission gear. The target four-wheel drive switching signal is compared with the target recovery condition. If the preset recovery condition is met, and the transmission gear is in neutral and the vehicle speed is less than the preset vehicle speed threshold, the condition for switching to the four-wheel drive mode is met at this time, and the four-wheel drive mode switching can be recovered. This avoids the problem that the user is not satisfied due to the failure to switch the mode caused by signal interruption. The transmission gear is locked in neutral, a gear lock signal is generated and output to the four-wheel drive control system, and the four-wheel drive control system receives the gear lock signal to switch to the four-wheel drive mode. After the transmission gear is locked in neutral, the four-wheel drive mode is switched, which effectively avoids the problem of gear tooth impact of the transfer during the low-speed four-wheel drive mode switching process due to the switching of the transmission to other gears. This improves the reliability of the low-speed four-wheel drive function of the vehicle and enhances the driving experience of the user.

[0070] In some embodiments, the switching of the four-wheel drive mode includes switching from a non-low-speed four-wheel drive mode to a low-speed four-wheel drive mode, or switching from a low-speed four-wheel drive mode to a non-low-speed four-wheel drive mode.

[0071] Specifically, when the current mode of the transfer is a non-low-speed four-wheel drive mode, the switching of the four-wheel drive mode is switching from the non-low-speed four-wheel drive mode to the low-speed four-wheel drive mode. When the current mode of the transfer is a low-speed four-wheel drive mode, the switching of the four-wheel drive mode is switching from the low-speed four-wheel drive mode to the non-low-speed four-wheel drive mode.

[0072] In some embodiments, if the mode switching is from a non-low-speed four-wheel drive mode to a low-speed four-wheel drive mode, i.e., entering a low-speed four-wheel drive mode:

[0073] A maximum lock duration can be preset, and the non-low-speed four-wheel drive mode is switched to the low-speed four-wheel drive mode. When it is detected that the four-wheel drive mode request signal is the low-speed four-wheel drive mode (FourDrvModSwtReq=0x6 or DrivingModReq_ESP=0x9 / 0x14 / 0x15 / 0x16 / 0x17 / 0x18 / 0x1E / 0x1F), the four-wheel drive system state signal is the non-low-speed four-wheel drive state (SystemOperMod≠0x6), the four-wheel drive mode switching signal is switching (ModChangeInPro=0x1), the vehicle speed is less than a preset value, and the transmission gear is the neutral gear, the transmission gear is locked in the neutral gear at this time.

[0074] In the maximum lock duration, if it is detected that the four-wheel drive mode switching signal ModChangeInPro variable value changes from 0x1 to 0x0, which indicates that the four-wheel drive mode switching is completed and the low-speed four-wheel drive mode is switched to, the neutral gear is released at this time, and the subsequent gear switching request of the user can be responded.

[0075] In the maximum lock duration, if it is detected that the vehicle speed is greater than a preset vehicle speed threshold, the neutral gear is released at this time.

[0076] If the maximum lock duration ends and the four-wheel drive mode switching signal ModChangeInPro variable value is still 0x0, the neutral gear is released. The four-wheel drive mode request signal is detected. If the four-wheel drive mode request signal is the low-speed four-wheel drive mode (FourDrvModSwtReq=0x6 or DrivingModReq_ESP=0x9 / 0x14 / 0x15 / 0x16 / 0x17 / 0x18 / 0x1E / 0x1F), the neutral gear is not locked even if the condition of locking the neutral gear is met at this time. If the four-wheel drive mode request signal is the non-low-speed four-wheel drive mode, the neutral gear is locked if the condition of locking the neutral gear is met subsequently.

[0077] In some embodiments, if the mode is switched from the low-speed four-wheel drive mode to the non-low-speed four-wheel drive mode, that is, the low-speed four-wheel drive mode is exited:

[0078] A maximum lock duration can be preset, and the low-speed four-wheel drive mode is switched to the non-low-speed four-wheel drive mode. When it is detected that the four-wheel drive mode request signal is the non-low-speed four-wheel drive mode (FourDrvModSwtReq≠0x6 or DrivingModReq_ESP≠0x9 / 0x14 / 0x15 / 0x16 / 0x17 / 0x18 / 0x1E / 0x1F), the four-wheel drive system state signal is the low-speed four-wheel drive state (SystemOperMod=0x6), the four-wheel drive mode switching signal is switching (ModChangeInPro=0x1), the vehicle speed is less than a preset value, and the transmission gear is the neutral gear, the transmission gear is locked in the neutral gear at this time.

[0079] If the four-wheel drive mode switching signal ModChangeInPro is detected to change from 0x1 to 0x0 within the longest locking duration, it indicates that the four-wheel drive mode switching is completed and the vehicle has switched to the non-low-speed four-wheel drive mode, and the control releases the neutral lock, and the subsequent gear shifting request of the user can be responded.

[0080] If the vehicle speed is greater than the preset vehicle speed threshold within the longest locking duration, the control releases the neutral lock.

[0081] If the longest locking duration ends and the four-wheel drive mode switching signal ModChangeInPro is still 0x0, the control releases the neutral lock. The four-wheel drive mode request signal is detected. If the four-wheel drive mode request signal is the non-low-speed four-wheel drive mode, even if the condition for locking the neutral is met, the neutral is not locked. If the four-wheel drive mode request signal is the low-speed four-wheel drive mode, if the condition for locking the neutral is met subsequently, the neutral is locked.

[0082] In some embodiments, step 103 specifically comprises:

[0083] Step 1031, in response to the transmission gear being unlocked, determining the first time point corresponding to the last received first four-wheel drive switching signal before the target four-wheel drive switching signal starts to be lost.

[0084] In specific implementation, the target four-wheel drive switching signal is the lost four-wheel drive switching signal. If the transmission gear state is unlocked when the target four-wheel drive switching signal is lost, the first time point corresponding to the last received first four-wheel drive switching signal before the target four-wheel drive switching signal starts to be lost is determined.

[0085] For example, the number of target four-wheel drive switching signals is 1:

[0086] Within the first preset duration 100 ms, the lost target four-wheel drive switching signal is the 4th signal, and the time point corresponding to the 4th signal is 60 ms. Therefore, the first time point corresponding to the last received first four-wheel drive switching signal before the target four-wheel drive switching signal starts to be lost is the time point of 60 ms.

[0087] For example, the number of target four-wheel drive switching signals is 3:

[0088] Within the first preset duration 100 ms, the lost target four-wheel drive switching signal is the 2nd signal, the 4th signal, and the 5th signal, and the time point corresponding to the 2nd signal is 20 ms. Therefore, the first time point corresponding to the last received first four-wheel drive switching signal before the target four-wheel drive switching signal starts to be lost is the time point of 20 ms.

[0089] Step 1032, determining that the target recovery condition is that the target four-wheel drive switching signal is continuously received for a preset receiving number within a preset duration after the first time point.

[0090] In specific implementation, the target recovery condition is that the target four-wheel drive switching signal is continuously received for a preset receiving number within a preset duration after the first time point. That is, if the target four-wheel drive switching signal is continuously received for a preset receiving number within a preset duration after the first time point, it is indicated that the target four-wheel drive switching signal meets the target recovery condition.

[0091] For example, the preset duration is 100 ms, the preset receiving number is 2, and the target four-wheel drive switching signal is a four-wheel drive mode request signal. If the four-wheel drive mode request signal is lost, and the four-wheel drive mode request signal is continuously received for 2 times within 100 ms after the first time point, the target recovery condition is met.

[0092] For another example, the preset duration is 100 ms, the preset receiving number is 2, and the target four-wheel drive switching signal is a four-wheel drive mode switching signal and a four-wheel drive system state signal. If the four-wheel drive mode switching signal and the four-wheel drive system state signal are lost, and the four-wheel drive mode switching signal and the four-wheel drive system state signal are continuously received for 2 times within 100 ms after the first time point, the target recovery condition is met.

[0093] Through the above scheme, when the target four-wheel drive switching signal meets the target recovery condition, the transmission gear position is the neutral gear and the vehicle speed is less than the preset vehicle speed threshold, the transmission gear position is locked to the neutral gear, and the switching of the four-wheel drive mode can be realized. The conditions for switching the four-wheel drive mode are reduced, the transmission gear position is successfully locked to the neutral gear to a greater extent, and the user demand is met.

[0094] Specific examples of steps 1031 to 1032 are as follows:

[0095] When the signals (FourDrvModSwtReq, DrivingModReq_ESP, ModeChangeInPro, SystemOperMode) detected by the transmission controller are not continuously lost for 100 ms, the counting of the loss of the signals starts from the last received signal information. If 5 frames of packets are not continuously lost, the transmission controller automatically identifies and judges that the signals are temporarily interrupted, and the locking of the neutral gear is not triggered. At this time, the transmission controller cannot lock the neutral gear, the transmission controller sends a gear locking signal Lock_N_Sts=0x0, and the four-wheel drive control system cannot switch the four-wheel drive mode.

[0096] When the transmission controller receives a complete message for 5 cycles, the transmission controller transmits and receives signals every frame cycle of 20 ms. After the transmission controller detects the signals (FourDrvModSwtReq, DrivingModReq_ESP, ModeChangeInPro, SystemOperMode) for 2 frames, i.e., for more than 40 ms, the function of locking the neutral gear can be automatically restored, the transmission controller sends Lock_N_Sts = 0x1, and the four-wheel drive control system continuously receives this signal for 2 frames, which meets the four-wheel drive mode switching condition, and the four-wheel drive mode switching can be performed. During the switching of the four-wheel drive mode, the transmission controller normally locks the neutral gear, solves the problem that the signals are lost during the locking of the neutral gear, the neutral gear cannot be locked, and the four-wheel drive mode cannot be switched.

[0097] In some embodiments, step 103 specifically comprises:

[0098] Step 103A, in response to the transmission gear state being locked neutral, obtaining a target signal type corresponding to the lost target four-wheel drive switching signal, wherein the signal type of the target four-wheel drive switching signal includes a four-wheel drive system signal and a four-wheel drive mode request signal.

[0099] Step 103B, determining a target recovery condition of the target four-wheel drive switching signal according to the target signal type.

[0100] In specific implementation, when it is determined that the target four-wheel drive switching signal is lost at the moment when the transmission gear state is locked neutral, it indicates that the target four-wheel drive switching signal is lost at this time, and the transmission has already locked the neutral gear. That is, the loss of the target four-wheel drive switching signal occurs after the transmission gear is locked in the neutral gear, which will affect the four-wheel drive mode switching.

[0101] In the embodiment, the second preset time length can be 100 ms.

[0102] Obtaining a target signal type corresponding to the lost target four-wheel drive switching signal according to the target signal type, and determining a target recovery condition of the target four-wheel drive switching signal according to the target signal type, wherein the signal type of the target four-wheel drive switching signal includes a four-wheel drive system signal and a four-wheel drive mode request signal.

[0103] Through the above scheme, when the transmission is locked in the neutral gear, if there is a loss of the four-wheel drive switching signal, the target recovery condition of the target four-wheel drive switching signal can be determined according to the target signal type corresponding to the lost target four-wheel drive switching signal, which further ensures that the neutral gear of the transmission can be locked when the signal is lost, guarantees the stable switching of the four-wheel drive mode, and solves the problem that the signal is lost during the locking of the neutral gear, the neutral gear cannot be locked, and the low-speed four-wheel drive mode cannot be switched.

[0104] In some embodiments, step 103B comprises:

[0105] Step 103B1, in response to the target signal type being a four-wheel drive system signal, acquiring a loss number of the four-wheel drive system signal.

[0106] Step 103B2, determining a target recovery condition of the target four-wheel drive switching signal according to the loss number.

[0107] In specific implementation, when the signal type of the lost target four-wheel drive switching signal is a four-wheel drive system signal after the transmission lockout neutral gear, the loss number of the four-wheel drive system signal is acquired, the four-wheel drive system signal including a four-wheel drive system state signal and a four-wheel drive mode switching signal. The target recovery condition corresponding to the loss number is determined according to the loss number of the four-wheel drive system signal.

[0108] In some embodiments, step 103B2 specifically includes:

[0109] Step 103B21, in response to the loss number being less than or equal to a preset loss number, determining a second time point corresponding to the last received second four-wheel drive switching signal before the four-wheel drive system signal starts to be lost.

[0110] Step 103B22, determining that the target recovery condition is that the four-wheel drive system signal is continuously received for a preset receiving number within a preset duration after the second time point.

[0111] Alternatively,

[0112] Step 103B23, in response to the loss number being greater than the preset loss number, determining that the target four-wheel drive switching signal meets the target recovery condition.

[0113] In specific implementation, when the signal type of the lost target four-wheel drive switching signal is a four-wheel drive system signal after the transmission lockout neutral gear, the loss number of the four-wheel drive system signal is acquired, the four-wheel drive system signal including a four-wheel drive system state signal and a four-wheel drive mode switching signal.

[0114] When the loss number of the four-wheel drive system signal is less than or equal to a preset loss number, a second time point corresponding to the last received second four-wheel drive switching signal before the four-wheel drive system signal starts to be lost is determined.

[0115] Exemplarily, the lost four-wheel drive system signal is a third frame signal, and a time point corresponding to the third frame signal is 40 ms. Then, the second time point corresponding to the last received second four-wheel drive switching signal before the four-wheel drive system signal starts to be lost is a time point of 40 ms.

[0116] The four-wheel drive system signal is continuously received, and the target recovery condition is determined as the four-wheel drive system signal being continuously received for a preset number of times within a preset duration after the second time point. That is, if the four-wheel drive system signal is continuously received for the preset number of times within the preset duration after the second time point, the target recovery condition is met, that is, the condition for locking the transmission gear is met, and the transmission gear is controlled to be locked in the neutral gear.

[0117] When the number of losses is greater than the preset number of losses, it is determined that the target four-wheel drive switching signal meets the target recovery condition regardless of whether the four-wheel drive mode request signal is received, and the transmission gear is controlled to be locked in the neutral gear.

[0118] A specific example of step 103B23 is as follows:

[0119] Timing starts from the transmission controller locking the neutral gear. During this process, as long as the four-wheel drive system signal ModeChangeInPro (four-wheel drive mode switching signal) and SystemOperMode (four-wheel drive system state signal) are lost for more than 3 frames, regardless of whether the signal FourDrvModSwtReq (four-wheel drive mode request signal) of the BCM or the signal DrivingModReq_ESP (four-wheel drive mode request signal) of the ESP is lost. After receiving the signal FourDrvModSwtReq of the BCM or the signal DrivingModReq_ESP of the ESP, the TCU needs to lock the neutral gear, and then unlock after 5s. This solves the problem of the neutral gear being locked after the signal is lost, and the four-wheel drive mode cannot be switched.

[0120] In some embodiments, step 103B2 specifically further includes:

[0121] Step A, determining that the transmission gear is controlled to stop locking the neutral gear after a third preset duration of controlling the transmission gear to lock the neutral gear;

[0122] Step B, generating and outputting a gear unlocking signal.

[0123] In specific implementation, when the target signal type of the target four-wheel drive switching signal is the four-wheel drive system signal, the transmission gear and the vehicle speed are obtained when it is determined that the target four-wheel drive switching signal meets the target recovery condition. If the transmission gear is the neutral gear and the vehicle speed is less than a preset vehicle speed threshold, the transmission gear is controlled to lock the neutral gear for a third preset duration, and a gear locking signal is generated and output, so that the four-wheel drive control system receives the gear locking signal and switches the four-wheel drive mode. The third preset duration is greater than a preset mode switching duration.

[0124] Exemplarily, the preset loss times is 3, the third preset time length is 5 seconds, and the preset mode switching required time length is 4 seconds. If the lost signal is the four-wheel drive system state signal after the transmission lockout neutral position, the loss times of the four-wheel drive system state signal is determined. If the loss times is 4, which is greater than the preset loss times, the transmission gear position is locked in the neutral position for 5 seconds, and the gear lock signal is generated and output.

[0125] In another example, the preset duration is 100 ms, the preset loss times is 3, and the preset receiving times is 2. If the lost signal is the four-wheel drive system state signal after the transmission lockout neutral position, the loss times of the four-wheel drive system state signal is determined. If the loss times is 2, after the four-wheel drive system signal is determined to be lost, the four-wheel drive system signal is continuously received twice within 100 ms after the second time point, the transmission gear position is locked in the neutral position for 5 seconds, and the gear lock signal is generated and output.

[0126] According to the above scheme, when the signal is lost after the transmission lockout neutral position, if the lost signal is the four-wheel drive system signal, the loss times is determined. If the loss times exceeds the preset loss times, the transmission gear position is locked regardless of whether the four-wheel drive mode request signal is received, so as to ensure stable switching of the four-wheel drive mode. If the loss times does not exceed the preset loss times, when the four-wheel drive system signal is continuously received for the preset times within the preset time length, the transmission gear position is locked, so as to ensure stable switching of the four-wheel drive mode.

[0127] In some embodiments, step 103B specifically comprises:

[0128] Step 103Ba, in response to the target four-wheel drive switching signal being the four-wheel drive mode request signal, determining a third time point corresponding to the last received third four-wheel drive switching signal before the four-wheel drive mode request signal starts to be lost.

[0129] Step 103Bb, determining that the target recovery condition is that the four-wheel drive system signal is continuously received for a preset receiving times within a preset duration after the third time point.

[0130] In specific implementation, after the transmission lockout neutral position, the signal type of the lost target four-wheel drive switching signal is the four-wheel drive mode request signal, and a third time point corresponding to the last received third four-wheel drive switching signal before the four-wheel drive mode request signal starts to be lost is determined.

[0131] Exemplarily, the lost four-wheel drive mode request signal is the second frame signal, and the time point corresponding to the second frame signal is the 20th ms. Therefore, the third time point corresponding to the last received third four-wheel drive switching signal before the four-wheel drive mode request signal starts to be lost is the 20th ms.

[0132] The target recovery condition is determined as that the four-wheel drive system signal is continuously received for a preset receiving number within a preset duration after the third time point. That is, if the four-wheel drive system signal is continuously received for the preset receiving number within the preset duration after the third time point, the condition of the transmission gear position being locked is met, at this time, the transmission gear position is controlled to be locked in the neutral position, and the gear position locking signal is generated and output, so that the four-wheel drive control system receives the gear position locking signal and switches the four-wheel drive mode. The third preset duration is greater than a preset mode switching duration.

[0133] Exemplarily, the preset duration is 100 ms, and the preset receiving number is 2. If the four-wheel drive system signal is continuously received for 2 times within 100 ms after the second time point after the four-wheel drive mode request signal is lost, the transmission gear position is controlled to be locked in the neutral position for 5 seconds, and the gear position locking signal is generated and output.

[0134] Through the above scheme, when the signal is lost after the transmission gear position is locked in the neutral position, if the lost signal is the four-wheel drive mode request signal, if the four-wheel drive system signal is not lost, the transmission gear position can still be controlled to be locked in the neutral position, so as to ensure stable switching of the four-wheel drive mode.

[0135] Specific examples of the above steps 103Ba to 103Bc are as follows:

[0136] If the transmission controller detects that the signal FourDrvModSwtReq of the BCM or the signal DrivingModReq_ESP of the ESP is not continuously lost, a certain time period is not 100 ms, and 5 frames of messages are continuously received, the signal loss is counted from the last received signal information, if 5 frames of messages are not continuously lost, the TCU receives 2 frames of four-wheel drive signals ModeChangeInPro and SystemOperMode, the TCU can normally execute the normal locking N-gear strategy, the four-wheel drive switching condition is met, and the four-wheel drive mode switching can be performed.

[0137] Based on the same inventive concept, another embodiment of the present disclosure provides a signal processing method for four-wheel drive mode switching of a vehicle, applied to a four-wheel drive control system, as shown in Figure 3 The method comprises the following steps:

[0138] Step 301, receiving the gear position locking signal obtained by the signal processing method for four-wheel drive mode switching of the vehicle;

[0139] Step 302, controlling the transfer to switch the four-wheel drive mode.

[0140] In specific implementation, the four-wheel drive control system receives the gear position locking signal sent by the transmission controller, and it is determined that the transmission gear position is locked in the neutral position. The four-wheel drive control system can control the transfer to switch the four-wheel drive mode.

[0141] In some embodiments, the switching of the four-wheel drive mode comprises switching from the non-low-speed four-wheel drive mode to the low-speed four-wheel drive mode, or switching from the low-speed four-wheel drive mode to the non-low-speed four-wheel drive mode.

[0142] Specifically, when the current mode of the transfer is the non-low-speed four-wheel drive mode, the switching of the four-wheel drive mode is switching from the non-low-speed four-wheel drive mode to the low-speed four-wheel drive mode. When the current mode of the transfer is the low-speed four-wheel drive mode, the switching of the four-wheel drive mode is switching from the low-speed four-wheel drive mode to the non-low-speed four-wheel drive mode.

[0143] Based on the same inventive concept, another embodiment of the present disclosure provides a signal processing method for switching four-wheel drive mode of a vehicle, and the specific process is as follows:

[0144] When the user switches the four-wheel drive mode through the switch, that is, sends the four-wheel drive mode switching instruction, the switch signal transmits the mode switching request to the CEM through the LIN line through the gateway. The CEM transmits the request to the ESP / BCM, the ESP sends the four-wheel drive mode request signal DrivingModReq_ESP, and the BCM sends the four-wheel drive mode request signal FourDrvModSwtReq. The four-wheel drive system responds to this signal to shift gears, and the TCU receives the DrivingModReq_ESP sent by the ESP, the FourDrvModSwtReq sent by the BCM, and the SystemOperMod and ModeChangeInPro signals sent by the four-wheel drive system.

[0145] In this embodiment, the specific content of the four-wheel drive mode request signal is shown in Table 1:

[0146] Table 1

[0147]

[0148]

[0149]

[0150] In this embodiment, the specific content of the four-wheel drive mode switching signal is shown in Table 2:

[0151] Table 2

[0152]

[0153] In this embodiment, the specific content of the four-wheel drive system state signal is shown in Table 3:

[0154] Table 3

[0155]

[0156] Vehicle enters / leaves 4L mode, lock N strategy, TCU continuously monitors FourDrvModSwtReq signal sent by BCM (DrivingModReq_ESP sent by ESP for terrain-dominant models), ModeChangeInPro signal sent by four-wheel drive system, and SystemOperMod signal sent by four-wheel drive system when the transmission is in N range.

[0157] Vehicle switches from non-low-speed four-wheel drive mode to low-speed four-wheel drive mode:

[0158] When TCU detects FourDrvModSwtReq = 0x6 (4L) (DrivingModReq_ESP = 0x9 / 0x14 / 0x15 / 0x16 / 0x17 / 0x18 / 0x1E / 0x1F for terrain-dominant models)

[0159] SystemOperMod ≠ 0x6 (four-wheel drive is in non-4L mode), ModChangeInPro = 0x1, vehicle speed < 4 kph, and transmission is in N range, TCU controls N lock. TCU locks the gear in N range Lock_N_Sts = 0x1, at this time TCU does not allow the transmission to switch to D\R\P\M range. Four-wheel drive receives Lock_N_Sts = 0x1 and then performs 4L gear shifting operation.

[0160] The longest locking time is set to 25 seconds, and when TCU detects that four-wheel drive mode switching signal ModChangeInPro variable value changes from 0x1 to 0x0 within 25 seconds, N lock is immediately released. If the vehicle speed exceeds 4 kph (can be marked) during the locking process, the N lock function is released.

[0161] If ModChangeInPro variable value does not change to 0x0 within 25 seconds, TCU immediately releases N lock after 25 seconds. When the locking time reaches 25 seconds, TCU forcibly releases N lock, and at the same time TCU starts detecting FourDrvModSwtReq signal sent by BCM (DrivingModReq_ESP sent by ESP for terrain-dominant models).

[0162] Case 1: If BCM signal FourDrvModSwtReq is always 0x6 (4L) (DrivingModReq_ESP signal is always 0x9 / 0x14 / 0x15 / 0x16 / 0x17 / 0x18 / 0x1E / 0x1F for terrain-dominant models), even if the conditions for entering 4L and MTS mode locking N in 4L are met, TCU does not enter the next N range cycle, and TCU gear responds to the driver's request.

[0163] Case 2: If the request value of the BCM signal FourDrvModSwtReq becomes non-4L (the DrivingModReq_ESP signal of the full terrain dominated vehicle becomes non-0x9 / 0x14 / 0x15 / 0x16 / 0x17 / 0x18 / 0x1E / 0x1F), and then if the conditions for entering 4L and locking N range in the MTS mode under 4L are met, the TCU can start the next locking N range cycle.

[0164] The vehicle is switched from the low-speed four-wheel drive mode to the non-low-speed four-wheel drive mode:

[0165] When the TCU detects FourDrvModSwtReq ≠ 0x6 (the BCM request signal is non-4L) (the DrivingModReq_ESP signal of the full terrain dominated vehicle

[0166] DrivingModReq_ESP ≠ 0x9 / 0x14 / 0x15 / 0x16 / 0x17 / 0x18 / 0x1E / 0x1F), SystemOperMod = 0x6 (4L), ModChangeInPro = 0x1, vehicle speed < 4 kph, and the transmission is in N range, the TCU controls the N range lock. The TCU locks the gear in N range Lock_N_Sts = 0x1, at which time the TCU does not allow the transmission to switch to D\R\P\M range. The four-wheel drive receives Lock_N_Sts = 0x1 and then performs 4L gear shifting operation.

[0167] The maximum locking time is set to 25 seconds. Within 25 seconds, when the TCU detects that the four-wheel drive mode switching signal ModChangeInPro variable value changes from 0x1 to 0x0, the N range lock is immediately released. If the vehicle speed exceeds 4 kph (can be marked) during the locking process, the N range lock function is released.

[0168] Within 25 seconds, the ModChangeInPro variable value does not change to 0x0, and after 25 seconds, the TCU immediately releases the N range lock. When the locking time reaches 25 seconds, the TCU forcibly releases the N range lock, and at the same time, the TCU starts detecting the BCM signal FourDrvModSwtReq (the DrivingModReq_ESP signal of the full terrain dominated vehicle):

[0169] Case 1: If the value of the BCM signal FourDrvModSwtReq does not change (the value of the DrivingModReq_ESP signal of the full terrain dominated vehicle does not change), even if the conditions for exiting 4L and locking N range in the MTS mode under 4L are met, the TCU cannot start the next locking N range cycle.

[0170] Case two: if the variable value of signal FourDrvModSwtReq is detected to change (the value of DrivingModReq_ESP signal changes in the full terrain dominated vehicle), when the conditions for exiting 4L and 4L under MTS mode locking N are met, the TCU can start the next N lock cycle.

[0171] If there is signal loss during the TCU N lock process, the specific processing process is as follows:

[0172] Case one: when the vehicle is in the process of entering 4L mode, the TCU is not in the state of locking N, i.e. Lock_N_Sts = 0x0.

[0173] When the signals (FourDrvModSwtReq, DrivingModReq_ESP, ModeChangeInPro, SystemOperMode) detected by the TCU are not continuously lost, and the time period does not reach 100 ms, the signal information received from the last time is started, i.e. the loss of signal is counted. When 5 frames of continuous loss messages are not reached, the TCU automatically recognizes and judges that the signal is temporarily interrupted, and does not trigger N lock. At this time, the TCU cannot lock N, and the TCU sends the N lock signal Lock_N_Sts = 0x0, and the four-wheel drive cannot switch the 4L mode.

[0174] When the TCU receives 5 complete message information, the TCU transmits and receives signal every frame period of 20 ms, and the signals (FourDrvModSwtReq, DrivingModReq_ESP, ModeChangeInPro, SystemOperMode) detected by the TCU are continuously received for 2 frames, i.e. 40 ms or more, the N lock function can be restored, the TCU sends Lock_N_Sts = 0x1, the four-wheel drive continuously receives 2 frames of this signal, meets the 4L switching condition, and can switch the 4L mode. In the process of switching the 4L mode, the TCU normally locks N, solves the problem that the N lock cannot be locked and the 4L mode cannot be switched due to signal loss in the N lock process.

[0175] Case two: when the vehicle is in the process of entering / exiting 4L mode, the TCU locks N after this time, and the TCU sends the N lock signal Lock_N_Sts = 0x1.

[0176] If the signals FourDrvModSwtReq of the BCM or DrivingModReq_ESP of the ESP detected by the TCU are not continuously lost at this time, a certain period of time does not reach 100 ms, 5 frames of continuous messages are received, the signal loss start counting is not reached from the last received signal information, 5 frames of continuous messages are not received, and the TCU receives 2 frames of continuous four-wheel drive signals ModeChangeInPro and SystemOperMode, the TCU can normally execute the normal locking N-gear strategy, meet the 4L switching condition, and can perform 4L mode switching.

[0177] Case three: after the TCU locks the N-gear:

[0178] Timing starts from the TCU locking the N-gear. During this process, as long as the four-wheel drive signals ModeChangeInPro and SystemOperMode are lost for more than 3 frames, regardless of whether the signals FourDrvModSwtReq of the BCM or DrivingModReq_ESP of the ESP are lost, the TCU needs to lock the N-gear after receiving the signals FourDrvModSwtReq of the BCM or DrivingModReq_ESP of the ESP, and then unlock after 5 s of locking, so as to solve the problem that the signals are lost during the N-gear process, the N-gear cannot be locked, and the 4L mode cannot be switched.

[0179] It should be noted that the method of the embodiments of the present disclosure can be executed by a single device, such as a computer or a server. The method of the embodiments can also be applied to a distributed scenario and completed by multiple devices cooperating with each other. In the case of such a distributed scenario, one of the multiple devices can only execute one or more steps in the method of the embodiments of the present disclosure, and the multiple devices can interact with each other to complete the method.

[0180] It should be noted that some embodiments of the present disclosure have been described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order than the order described above and still achieve desirable results. In addition, the processes depicted in the figures do not necessarily require the particular order shown or sequential order to achieve the desired results. In certain implementations, multitasking and parallel processing can be advantageous.

[0181] Based on the same inventive concept, the present disclosure also provides a signal processing device for vehicle four-wheel drive mode switching, which is arranged in a transmission controller, corresponding to the method of any of the above embodiments.

[0182] Reference Figure 4 , Figure 4The vehicle four-wheel drive mode switching device comprises:

[0183] The judging module 401 is configured to judge whether the target four-wheel drive switching signal is lost within a first preset time length in response to receiving the four-wheel drive mode switching instruction.

[0184] The receiving interrupt module 402 is configured to determine that the target four-wheel drive switching signal is lost within the first preset time length and judge the transmission gear state.

[0185] The condition determining module 403 is configured to determine the target recovery condition of the target four-wheel drive switching signal according to the transmission gear state.

[0186] The lock control module 404 is configured to control the transmission gear to lock the neutral state in response to the target four-wheel drive switching signal satisfying the target recovery condition and the transmission gear state being the neutral state and the vehicle speed being less than a preset vehicle speed threshold.

[0187] The signal generating module 405 is configured to generate and output a gear lock signal to the four-wheel drive control system for the four-wheel drive control system to switch the four-wheel drive mode after receiving the gear lock signal.

[0188] In some embodiments, the condition determining module 403 is specifically configured to:

[0189] In response to the transmission gear state being the non-locked neutral state, determine a first time point corresponding to the last received first four-wheel drive switching signal before the target four-wheel drive switching signal starts to be lost.

[0190] Determine that the target recovery condition is that, within a preset continuous time length after the first time point, the target four-wheel drive switching signal satisfies a preset recovery condition in response to continuously receiving a preset receiving number of target four-wheel drive switching signals.

[0191] In some embodiments, the condition determining module 403 is specifically configured to:

[0192] The signal type determining unit is configured to acquire a target signal type corresponding to the lost target four-wheel drive switching signal in response to the transmission gear state being the locked neutral state, wherein the signal type of the target four-wheel drive switching signal includes a four-wheel drive system signal and a four-wheel drive mode request signal.

[0193] The condition determining unit is configured to determine the target recovery condition of the target four-wheel drive switching signal according to the target signal type.

[0194] In some embodiments, the condition determining unit specifically includes:

[0195] A number of times determination sub-unit is configured to, in response to the target signal type being the four-wheel drive system signal, acquire a number of losses of the four-wheel drive system signal.

[0196] A condition determination sub-unit is configured to determine a target recovery condition of the target four-wheel drive switching signal according to the number of losses.

[0197] In some embodiments, the condition determination sub-unit is specifically configured to:

[0198] In response to the number of losses being less than or equal to a preset number of losses, determine a second time point corresponding to a last received second four-wheel drive switching signal before a start of loss of the four-wheel drive system signal;

[0199] determine that the target recovery condition is that the four-wheel drive system signal is continuously received for a preset number of receptions within a preset duration after the second time point; or,

[0200] In response to the number of losses being greater than a preset number of losses, determine that the target four-wheel drive switching signal meets a target recovery condition.

[0201] In some embodiments, the condition determination sub-unit is specifically further configured to:

[0202] determine that the control transmission gear lock is stopped after a third preset duration of the control transmission gear lock being in the neutral position;

[0203] generate and output a gear unlocking signal.

[0204] In some embodiments, the condition determination unit is specifically configured to:

[0205] In response to the target four-wheel drive switching signal type being the four-wheel drive mode request signal, determine a third time point corresponding to a last received third four-wheel drive switching signal before a start of loss of the four-wheel drive mode request signal;

[0206] determine that the target recovery condition is that the four-wheel drive system signal is continuously received for a preset number of receptions within a preset duration after the third time point.

[0207] Based on the same inventive concept, the disclosure also provides a vehicle four-wheel drive mode switching device corresponding to any of the above-mentioned embodiment methods, which is arranged in a four-wheel drive control system.

[0208] Reference Figure 5 , Figure 5 The vehicle four-wheel drive mode switching device of the embodiment comprises:

[0209] A signal receiving module 501 is configured to receive a gear lock signal obtained by the vehicle four-wheel drive mode switching device;

[0210] The switching module 502 is configured to control the transfer case to switch the four-wheel drive mode.

[0211] For the convenience of description, the above apparatus is described in various modules in terms of functions. Of course, the functions of the modules can be implemented in one or more software and / or hardware when implementing the present disclosure.

[0212] The apparatus of the above embodiments is used to implement the corresponding method of any of the above embodiments, and has the beneficial effects of the corresponding method embodiments, which are not described here again.

[0213] Based on the same inventive concept, the present disclosure also provides an electronic device corresponding to the method of any of the above embodiments, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the signal processing method of vehicle four-wheel drive mode switching according to any of the above embodiments when executing the program.

[0214] Figure 6 A more specific hardware structure of an electronic device provided by the present embodiment is shown, which can include a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040 and a bus 1050. The processor 1010, the memory 1020, the input / output interface 1030 and the communication interface 1040 are connected to each other through the bus 1050 for communication within the device.

[0215] The processor 1010 can be implemented in the form of a general-purpose CPU (Central Processing Unit), a microprocessor, an ASIC (Application Specific Integrated Circuit) or one or more integrated circuits, etc., for executing related programs to implement the technical solutions provided by the present embodiment.

[0216] The memory 1020 can be implemented in the form of a ROM (Read Only Memory), a RAM (Random Access Memory), a static storage device, a dynamic storage device, etc. The memory 1020 can store an operating system and other application programs, and when the technical solutions provided by the present embodiment are implemented by software or firmware, the related program codes are stored in the memory 1020 and executed by the processor 1010.

[0217] The input / output interface 1030 is configured to connect an input / output module to realize information input and output. The input / output module can be configured in the device (not shown in the figure) or externally connected to the device to provide corresponding functions. The input device can include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output device can include a display, a speaker, a vibrator, an indicator light, etc.

[0218] The communication interface 1040 is configured to connect a communication module (not shown in the figure) to realize communication interaction between the device and other devices. The communication module can realize communication through a wired manner (such as a USB, a network cable, etc.) or a wireless manner (such as a mobile network, WIFI, Bluetooth, etc.).

[0219] The bus 1050 includes a channel to transmit information between various components (such as the processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040) of the device.

[0220] It should be noted that although the above device only shows the processor 1010, the memory 1020, the input / output interface 1030, the communication interface 1040, and the bus 1050, in the specific implementation process, the device can also include other components necessary for normal operation. In addition, those skilled in the art can understand that the above device can also only include components necessary for implementing the embodiments of the present disclosure, and does not necessarily include all the components shown in the figure.

[0221] The electronic device of the above embodiments is used to implement the corresponding method in any of the above embodiments, and has the beneficial effects of the corresponding method embodiments, which are not described here.

[0222] Based on the same inventive concept, the disclosure also provides a non-transitory computer-readable storage medium storing computer instructions for causing a computer to execute the method of any of the above embodiments.

[0223] The computer readable medium of the embodiments includes permanent and non-permanent, removable and non-removable media, which can realize information storage by any method or technology. The information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible by a computing device.

[0224] The storage medium of the above-mentioned embodiments stores computer instructions for causing the computer to execute the method as described in any of the above embodiments, and has the beneficial effects of the corresponding method embodiments, which are not repeated here.

[0225] Based on the same inventive concept, the present application also provides a vehicle comprising the vehicle four-wheel drive mode switching device of the above-mentioned embodiments, the electronic device of the above-mentioned embodiments, the computer readable storage medium of the above-mentioned embodiments, and the vehicle device implements the method of any of the above-mentioned embodiments.

[0226] The vehicle of the above-mentioned embodiments is used to implement the method of any of the above-mentioned embodiments, and has the beneficial effects of the corresponding method embodiments, which are not repeated here.

[0227] It can be understood that before using the technical solutions of the various embodiments in the present disclosure, the user will be informed of the type, scope of use, use scenario, etc. of the personal information involved by appropriate means, and the authorization of the user will be obtained.

[0228] For example, in response to receiving the user's active request, the user is sent prompt information to explicitly prompt the user that the operation requested to be performed will require the acquisition and use of the user's personal information. Thus, the user can voluntarily choose whether to provide personal information to the software or hardware such as electronic devices, application programs, servers or storage media that perform the technical solutions of the present disclosure according to the prompt information.

[0229] As an optional but not limited implementation manner, in response to accepting the user's active request, the way of sending prompt information to the user may, for example, be a pop-up window manner, in which the prompt information can be presented in the form of text. In addition, the pop-up window can also carry selection controls for the user to select "agree" or "disagree" to provide personal information to the electronic device.

[0230] It can be understood that the above notification and obtaining user authorization process is only illustrative, and does not limit the implementation of the present disclosure, and other ways meeting relevant laws and regulations can also be applied to the implementation of the present disclosure.

[0231] Those skilled in the art should understand that the discussion of any embodiment is merely exemplary and is not intended to limit the scope of the present disclosure (including claims) to these examples; the above embodiments or technical features among different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the embodiments of the present disclosure as described above, which are not provided in details for the sake of brevity.

[0232] In addition, in order to simplify the description and discussion, and so as not to make the embodiments of the present disclosure difficult to understand, the well-known power / ground connections of integrated circuit (IC) chips and other components can or can not be shown in the provided drawings. In addition, the apparatus can be shown in the form of a block diagram in order to avoid making the embodiments of the present disclosure difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram apparatus are highly dependent on the platform to be implemented to implement the embodiments of the present disclosure (i.e., these details should be fully within the understanding of those skilled in the art). Where specific details (e.g., circuitry) are set forth in order to describe an illustrative embodiment of the present disclosure, it will be apparent to those skilled in the art that the present disclosure can be practiced without these specific details or with an implementation varying from these specific details. Therefore, these descriptions should be considered as illustrative rather than limiting.

[0233] Although the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) can use the embodiments discussed.

[0234] The embodiments of the present disclosure are intended to cover all such alternatives, modifications and variations as falling within the broad scope of the appended claims. Accordingly, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A signal processing method for vehicle four-wheel drive mode switching, characterized by, The application is applied to a transmission controller, comprising: in response to receiving a four-wheel drive mode switching instruction, determining whether there is a target four-wheel drive switching signal loss within a first preset time length; determining that there is a target four-wheel drive switching signal loss within a first preset time length, and determining a transmission gear state; determining a target recovery condition of the target four-wheel drive switching signal according to the transmission gear state; in response to the target four-wheel drive switching signal meeting the target recovery condition, the transmission gear being a neutral gear, and the vehicle speed being less than a preset vehicle speed threshold, controlling the transmission gear to be locked in the neutral gear; generating and outputting a gear locking signal to a four-wheel drive control system, so that the four-wheel drive control system receives the gear locking signal and switches the four-wheel drive mode; the target recovery condition of the target four-wheel drive switching signal according to the transmission gear state comprises: in response to the transmission gear state being a locked neutral gear, acquiring a target signal type corresponding to the lost target four-wheel drive switching signal, wherein the signal type of the target four-wheel drive switching signal comprises a four-wheel drive system signal, and the four-wheel drive system signal is a signal sent by the four-wheel drive system to the transmission controller; determining a target recovery condition of the target four-wheel drive switching signal according to the target signal type; the target recovery condition of the target four-wheel drive switching signal according to the target signal type comprises: in response to the target signal type being a four-wheel drive system signal, acquiring a loss frequency of the four-wheel drive system signal; determining a target recovery condition of the target four-wheel drive switching signal according to the loss frequency; the target recovery condition of the target four-wheel drive switching signal according to the loss frequency comprises: in response to the loss frequency being less than or equal to a preset loss frequency, determining a second time point corresponding to a second four-wheel drive switching signal received last before the four-wheel drive system signal starts to be lost; determining that the target recovery condition is that a preset receiving frequency of the four-wheel drive system signal is continuously received within a preset continuous time length after the second time point.

2. The method of claim 1, wherein, the target recovery condition of the target four-wheel drive switching signal according to the transmission gear state comprises: in response to the transmission gear state being an unlocked neutral gear, determining a first time point corresponding to a first four-wheel drive switching signal received last before the target four-wheel drive switching signal starts to be lost; determining that the target recovery condition is that a preset receiving frequency of the target four-wheel drive switching signal is continuously received within a preset continuous time length after the first time point.

3. The method of claim 1, wherein, The signal type of the target four-wheel drive switching signal comprises a four-wheel drive mode request signal.

4. The method of claim 1, wherein, the target recovery condition of the target four-wheel drive switching signal according to the loss frequency further comprises: in response to the loss frequency being greater than a preset loss frequency, determining that the target four-wheel drive switching signal meets the target recovery condition.

5. The method of claim 4, wherein, after determining that the target four-wheel drive switching signal meets the target recovery condition, further comprising: determining to control the transmission gear to stop being locked in the neutral gear after a third preset time length; generating and outputting a gear unlocking signal.

6. The method of claim 3, wherein, the target recovery condition of the target four-wheel drive switching signal according to the target signal type comprises: in response to the target signal type being a four-wheel drive mode request signal, determining a third time point corresponding to a last received third four-wheel drive switching signal before the four-wheel drive mode request signal starts to be lost; determining that the target recovery condition is that a preset number of receiving times of four-wheel drive system signals are continuously received within a preset duration after the third time point.

7. A vehicle four-wheel drive mode switching method characterized by comprising: application to a four-wheel drive control system, comprising: receiving the gear lock signal obtained by the signal processing method for vehicle four-wheel drive mode switching according to any one of claims 1 to 6; controlling the transfer to switch the four-wheel drive mode. 8.An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the signal processing method for vehicle four-wheel drive mode switching according to any one of claims 1 to 6 or the vehicle four-wheel drive mode switching method according to claim 7 when executing the program.

9. A vehicle characterized by comprising: The electronic device according to claim 8.

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