Electronic control transfer case gear shifting operation reminding control method and system

Abstract

The invention discloses an electric control transfer case gear shifting operation reminding control method which comprises the following steps that firstly, a gear shifting request signal is received, and the gear shifting request signal comprises target gear information; step 2, acquiring current state information of a vehicle, wherein the current state information of the vehicle comprises a current gear of a transfer case, a current gear of a transmission, a vehicle speed signal and a brake signal; 3, judging whether a gear shifting condition is met or not based on the target gear information and the current state information of the vehicle; 4, when the gear shifting condition is not met, gear shifting operation reminding information is generated; 5, the gear shifting operation reminding information is displayed in at least one mode of characters, voice or graphs through a vehicle-mounted display terminal; the driver can be well guided to operate the vehicle, transfer case gear shifting is achieved, and the problem of complaint caused by the fact that the transfer case cannot respond to the gear shifting intention of the driver in the gear shifting process is solved. And the safety, the reliability and the driving experience are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of off-road vehicle electronics, and in particular relates to a method and a system for prompting a shift operation of an electronically controlled transfer case. Background Art

[0002] The transfer case is a key component for off-road vehicles to achieve four-wheel drive. The transfer case is generally designed with different gears or working modes to cope with the vehicle's different off-road driving requirements. With the trend of electric control of automobiles, mechanical shift transfer cases are upgraded to electronic shift transfer cases. Because the transfer case is designed with a specific gear sequence and shifting conditions, when the transfer case is shifted, the electronic control system is in the process of protecting the electronic transfer case body. When it is judged that the shifting conditions are not met, the driver's transfer case shifting intention cannot be responded to in time. Only when the shifting conditions are met, the control system executes the shifting action. When the driver is not familiar with the working mode of the four-wheel drive system and is unclear about the shifting conditions of the transfer case, it is easy to cause complaints during the shifting process. Summary of the invention

[0003] The present invention aims to solve the problem that during the existing electronically controlled transfer case shifting operation, when the driver is not familiar with the working mode of the four-wheel drive system and is unclear about the transfer case shifting conditions, complaints are easily caused during the shifting process.

[0004] In view of the above problems, the technical solution adopted by the present invention is: a shift operation reminder control method for an electronically controlled shift transfer case, comprising the following steps:

[0005] Step 1: receiving a gear shift request signal, wherein the gear shift request signal includes target gear information;

[0006] Step 2: Acquire the vehicle's current state information, which includes the current gear position of the transfer case, the current gear position of the transmission, the vehicle speed signal, and the brake signal;

[0007] Step 3: Based on the target gear information and the vehicle current state information, determine whether a gear shifting condition is met;

[0008] Step 4: When the gear shifting condition is not met, a gear shifting operation reminder message is generated;

[0009] Step 5: Display the shift operation reminder information in at least one of text, voice or graphics via the vehicle-mounted display terminal.

[0010] Further, the current gear position and the target gear position of the transfer case include H gear, HL gear, N gear and L gear;

[0011] The current gear position of the transmission includes N gear and non-N gear;

[0012] The braking signal includes braking effective and braking ineffective.

[0013] Furthermore, the gear shifting conditions include vehicle speed conditions, braking conditions and transmission gear position conditions;

[0014] When performing a gear shift operation to a certain target gear, if multiple gear shift conditions are not met, the gear shift operation reminder display priority is: the priority of satisfying the vehicle speed condition is higher than the priority of satisfying the braking condition, and the priority of satisfying the braking condition is higher than the priority of satisfying the power interruption condition.

[0015] Furthermore, when the target gear is N gear:

[0016] First, the vehicle speed of the input signal is detected to be greater than the pre-stored vehicle speed threshold for the transfer case N gear shift, and then a prompt pops up on the vehicle instrument or other display vehicle terminal to request the transfer case to shift to N gear and reduce the vehicle speed;

[0017] If the vehicle speed condition is met, the next step is to detect whether the service brake in the input signal is effective. If not, a prompt pops up on the car instrument or other display car terminal to change the transfer case to N gear and step on the brake pedal. If the service brake is effective, the final step is to determine whether the current gear of the transmission is N gear. If the transmission is not in N gear, a prompt pops up on the car instrument or other display car terminal to change the transfer case to N gear and the transmission to N gear.

[0018] If the above three conditions are met, the transfer case shifting to N gear operation is executed. The priority of the shifting operation reminder display is that the priority of the vehicle speed condition judgment is higher than the priority of the braking condition judgment, and the priority of the braking condition judgment is higher than the priority of the transmission shifting to N gear judgment.

[0019] Furthermore, when the target gear is H gear:

[0020] If the current gear is HL, determine whether the vehicle speed is greater than the preset HL to H speed threshold;

[0021] If the current gear is L or N, determine whether the vehicle speed is greater than a preset L or N to H speed switching threshold;

[0022] When the vehicle speed is greater than the corresponding threshold, a reminder message to reduce the speed is generated;

[0023] When the vehicle speed is not greater than the corresponding threshold, determining whether the transmission is in the N gear;

[0024] When the transmission is not in the N gear, a reminder message is generated to shift the transmission into the N gear.

[0025] Furthermore, when the target gear is HL:

[0026] If the current gear is H gear, determine whether the vehicle speed is greater than the preset vehicle speed threshold for switching from H gear to HL gear;

[0027] If the current gear is L or N, determine whether the vehicle speed is greater than a preset L or N to HL switching speed threshold;

[0028] When the vehicle speed is greater than the corresponding threshold, a reminder message to reduce the speed is generated;

[0029] When the vehicle speed is not greater than the corresponding threshold, determining whether the transmission is in the N gear;

[0030] When the transmission is not in the N gear, a reminder message is generated to shift the transmission into the N gear.

[0031] Furthermore, when the target gear is L gear:

[0032] Determine whether the vehicle speed is greater than a preset L gear switching speed threshold;

[0033] When the vehicle speed is greater than a threshold, a reminder message to reduce the vehicle speed is generated;

[0034] When the vehicle speed is not greater than the threshold, determining whether the transmission is in the N gear;

[0035] When the transmission is not in the N gear, a reminder message is generated to shift the transmission into the N gear.

[0036] Furthermore, the abnormal condition processing steps are also included:

[0037] During the shifting process, the current signal of the transfer case shifting motor, the shifting execution time, the speed difference between the input and output shafts of the transfer case, the temperature signal of the transfer case, and the communication signal of the controller are monitored in real time;

[0038] When it is detected that the current signal exceeds the preset threshold value I1 for a duration of t1, it is determined that the transfer case is stuck, where I1 is 1.2-1.5 times the rated working current and t1 is 200-500 milliseconds; when it is detected that the shift execution time exceeds the preset time threshold t2, it is determined that the shift timeout is exceeded, where t2 is 2-3 seconds; when it is detected that the transfer case temperature signal exceeds the preset temperature threshold T1, it is determined to be overheat protection, where T1 is 120-150 degrees Celsius; when it is detected that the controller communication signal interruption time exceeds the preset time t3, it is determined to be a communication abnormality, where t3 is 100-300 milliseconds; the following processing strategies are selectively executed according to different abnormal working conditions:

[0039] When the transfer case gets stuck, the shift motor is controlled to run in reverse for a preset time t4 before shifting forward, where t4 is 50-100 milliseconds; when a shift timeout occurs, the shift operation is interrupted and the gear returns to the original gear; when overheating protection occurs, the shift operation is prohibited and the cooling strategy is started; when a communication abnormality occurs, the transfer case control unit is switched to emergency mode; for any abnormal operating condition, the vehicle operating data at the time of the fault is recorded, including vehicle speed, torque, gear position, axle speed and other information, for fault tracing.

[0040] As another aspect of the present invention, it also relates to a shift operation reminder control system for an electronically controlled shift transfer case, comprising:

[0041] a shift switch, for receiving a shift request from a driver and generating a shift request signal including target gear information;

[0042] A state acquisition unit is used to collect the current state information of the vehicle, including the current gear position of the transfer case, the current gear position of the transmission, the vehicle speed signal and the brake signal;

[0043] a controller, electrically connected to the shift switch and the state acquisition unit, for determining whether a shift condition is met based on the shift request signal and the current state information of the vehicle, and generating a shift operation reminder message when the shift condition is not met;

[0044] The display terminal is connected to the controller via a CAN bus, and is used to receive the gear shift operation reminder information and display it in at least one of text, voice or graphics; the gear shift operation reminder information is transmitted between the controller and the display terminal in the form of a CAN message; the display terminal includes an automobile instrument or other vehicle-mounted display device.

[0045] Furthermore, the controller has pre-stored in its memory vehicle speed threshold data for different gear shifts;

[0046] The controller is also used to determine the display order of the gear shifting operation reminder information according to a preset display priority, wherein the display priority of the vehicle speed condition is higher than the braking condition, and the display priority of the braking condition is higher than the transmission gear condition; the priority of satisfying the braking condition is higher than the priority of satisfying the power interruption condition.

[0047] The beneficial effects and features of the present invention are:

[0048] (1) The electronically controlled shifting transfer case shifting operation reminder control method of the present invention can well guide the driver to operate the vehicle and realize the transfer case shifting when the transfer case shifting conditions are not met, thereby solving the problem of complaints caused by the inability to respond to the driver's shifting intention during the transfer case shifting process.

[0049] (2) The shift operation reminder control method of the electronically controlled shift transfer case of the present invention: through a multi-dimensional abnormal monitoring and classification processing mechanism, it not only ensures the timely protection of the transfer case under abnormal conditions, but also provides a targeted processing strategy, and at the same time provides a basis for subsequent maintenance through the fault data recording function.

[0050] (3) The shift operation reminder control method of the electronically controlled shift transfer case of the present invention: by setting the shift retry mechanism and the number limit, it not only ensures the fault tolerance of the system when the shift fails due to instantaneous interference, but also avoids the damage to the transfer case caused by repeated shift attempts; at the same time, by recording the failure reason code, it provides a basis for subsequent fault diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A schematic diagram of the conditions for the transfer case to switch gears in a preferred embodiment of the present invention;

[0052] Figure 2 It is a flow chart of a preferred embodiment of the present invention; DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in 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 creative work are within the scope of protection of the present invention.

[0054] The present invention provides a shift operation reminder control method and system for an electronically controlled shift transfer case. The electronically controlled transfer case control system identifies a target gear position of the transfer case through a shift switch. When it is determined that a transfer case shift switching condition is not met, a shift operation reminder message needs to be popped up on a vehicle instrument panel or other vehicle display terminal. When the transfer case shift condition is not met, the driver can be well guided to perform vehicle operation to achieve transfer case shifting, thereby solving the problem of complaints caused by failure to respond to the driver's shifting intention during the transfer case shifting process.

[0055] Please refer to Figure 1-Figure 2 , an embodiment of the present invention relates to a method and system for controlling a shift operation reminder of an electronically controlled transfer case, comprising:

[0056] The input signals required to determine whether the transfer case shifting conditions are met include the current gear position of the transfer case, the target gear position, the current gear position of the transmission, the brake signal, and the current vehicle speed signal.

[0057] The current gear position of the transfer case and the target gear position are four situations: H gear, HL gear, N gear, and L gear. The current gear position of the transmission includes two forms: N gear or non-N gear. The brake signal includes two forms: service brake effective or service brake invalid.

[0058] The corresponding data of the vehicle speed threshold when the transfer case switches from a current transfer case gear position to another transfer case gear position can be pre-stored in the controller memory through calibration.

[0059] The electronic transfer case control system identifies the transfer case target gear position through the shift switch. When it is determined that the transfer case shifting conditions are not met, a shift operation reminder message needs to be popped up on the vehicle instrument panel or other display vehicle terminal. The driver is prompted to perform the shift operation in the form of voice prompts, graphics or text, or a combination of graphics and text.

[0060] The electronically controlled transfer case control system identifies the transfer case target gear position through the shift switch. When it is determined that the transfer case shift switching condition is not met, the transfer case controller sends a shift reminder message information through the CAN bus or implements the shift reminder control information in other ways. The specific definition of the shift reminder of the present invention is shown in Table 1. After the terminal instrument controller receives the shift reminder message information according to the determined protocol, the shift operation reminder information pops up on the vehicle instrument or other display vehicle terminal, or prompts and guides the driver to perform the shift operation through voice prompts, graphics or text or a combination of graphics and text.

[0061] Table 1 Transfer case shift operation reminder control information message and specific definition of shift reminder

[0062]

[0063]

[0064] When the target gear shift operation is N gear, firstly, the vehicle speed of the input signal is detected to be greater than the pre-stored vehicle speed threshold for the transfer case N gear shift, then a prompt pops up on the car instrument or other display car terminal to change the transfer case to N gear and reduce the speed. If the vehicle speed condition is met, then the service brake in the input signal is detected to be effective. If not, a prompt pops up on the car instrument or other display car terminal to change the transfer case to N gear and step on the brake pedal. If the service brake is effective, finally determine whether the current gear of the transmission is N gear. If the transmission is not in N gear, a prompt pops up on the car instrument or other display car terminal to change the transfer case to N gear and change the transmission to N gear. If all three conditions above are met, the transfer case N gear shift operation is executed. The priority of the shift operation reminder display is that the priority of the vehicle speed condition judgment is greater than the priority of the braking condition judgment, and the priority of the braking condition judgment is greater than the priority of the transmission N gear judgment.

[0065] When the target gear shift operation is to be in H gear, if the current gear position of the transfer case is in HL gear, it is detected whether the vehicle speed of the input signal is greater than the pre-stored vehicle speed threshold when the transfer case switches from HL gear to H gear. If so, a prompt pops up on the car instrument or other display car terminal to ask the transfer case to switch to H gear and reduce the speed. If the current gear position of the transfer case is in L gear or N gear, it is first detected whether the vehicle speed of the input signal is greater than the vehicle speed threshold when the transfer case switches from L gear or N gear to H gear. If so, a prompt pops up on the car instrument or other display car terminal to ask the transfer case to switch to H gear and reduce the speed. If the vehicle speed condition is met, it is then determined whether the current gear position of the transmission is N gear. If the transmission is not in N gear, a prompt pops up on the car instrument or other display car terminal to ask the transfer case to switch to H gear and the transmission to switch to N gear.

[0066] When the target gear shift operation is HL gear, if the current gear of the transfer case is in H gear, it is detected whether the vehicle speed of the input signal is greater than the pre-stored vehicle speed threshold when the transfer case switches from H gear to HL gear. If so, a prompt pops up on the car instrument or other display car terminal to change the transfer case to HL gear and reduce the speed. If the current gear of the transfer case is in L gear or N gear, it is first detected whether the vehicle speed of the input signal is greater than the vehicle speed threshold when the transfer case switches from L gear or N gear to HL gear. If so, a prompt pops up on the car instrument or other display car terminal to change the transfer case to HL gear and reduce the speed. If the vehicle speed condition is met, it is then determined whether the current gear of the transmission is N gear. If the transmission is not in N gear, a prompt pops up on the car instrument or other display car terminal to change the transfer case to HL gear and reduce the speed.

[0067] When the target gear shift operation is to be L gear, the vehicle speed of the input signal is first detected to be greater than the pre-stored vehicle speed threshold for the transfer case L gear shift, and a prompt pops up on the vehicle instrument or other display vehicle terminal to change the transfer case to L gear and reduce the vehicle speed. If the vehicle speed condition is met, it is then determined whether the current gear of the transmission is N gear. If the transmission is not in N gear, a prompt pops up on the vehicle instrument or other display vehicle terminal to change the transfer case to L gear and the transmission to N gear.

[0068] The relationship between the judgment of the gear shift condition not being met and the gear shift operation reminder information is strictly one-to-one corresponding. When performing a gear shift operation to a certain target gear, if multiple gear shift conditions are not met, the gear shift operation reminder display priority is that the priority of the vehicle speed condition is higher than the priority of the braking condition, and the priority of the braking condition is higher than the priority of the power interruption condition.

[0069] As a preferred solution, in some other embodiments, the electronically controlled shift transfer case shift operation reminder control method further includes setting a shift retry mechanism and a number limit, specifically: setting a shift retry counter, wherein the initial value of the shift retry counter is zero; when the shift condition is met but the shift execution fails, determining whether the count value of the shift retry counter is less than a preset retry number threshold N, wherein N is an integer greater than or equal to 2; if so, adding 1 to the count value of the shift retry counter, and performing the shift operation again after a preset retry waiting time T, wherein T is 1-5 seconds; if the count value of the shift retry counter reaches the retry number threshold N, a shift failure prompt message is generated and the shift process is exited, and a shift failure reason code is recorded at the same time; during the entire shift process, if it is detected that the shift condition is no longer met, the shift retry counter is cleared and the shift retry process is exited. The advantages of this solution are: by setting the gear shift retry mechanism and the number limit, it not only ensures the system's fault tolerance when the gear shift fails due to instantaneous interference, but also avoids the damage to the transfer case caused by repeated gear shift attempts; at the same time, by recording the failure reason code, it provides a basis for subsequent fault diagnosis.

[0070] As a preferred solution, in some other embodiments, the abnormal condition processing step is also included:

[0071] During the shifting process, the current signal of the transfer case shifting motor, the shifting execution time, the speed difference between the input and output shafts of the transfer case, the temperature signal of the transfer case, and the communication signal of the controller are monitored in real time;

[0072] When it is detected that the current signal exceeds the preset threshold value I1 for a duration of t1, it is determined that the transfer case is stuck, where I1 is 1.2-1.5 times the rated working current and t1 is 200-500 milliseconds; when it is detected that the shift execution time exceeds the preset time threshold t2, it is determined that the shift timeout is exceeded, where t2 is 2-3 seconds; when it is detected that the transfer case temperature signal exceeds the preset temperature threshold T1, it is determined to be overheat protection, where T1 is 120-150 degrees Celsius; when it is detected that the controller communication signal interruption time exceeds the preset time t3, it is determined to be a communication abnormality, where t3 is 100-300 milliseconds; the following processing strategies are selectively executed according to different abnormal working conditions:

[0073] When the transfer case gets stuck, the shift motor is controlled to run in reverse for a preset time t4 before shifting forward, where t4 is 50-100 milliseconds; when a shift timeout occurs, the shift operation is interrupted and the gear returns to the original gear; when overheating protection occurs, the shift operation is prohibited and the cooling strategy is started; when a communication abnormality occurs, the transfer case control unit is switched to emergency mode; for any abnormal operating condition, the vehicle operating data at the time of the fault is recorded, including vehicle speed, torque, gear position, axle speed and other information, for fault tracing.

[0074] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the structural relationship and principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for controlling a shift operation reminder of an electronically controlled transfer case, characterized in that: The following steps are involved: Step 1: receiving a gear shift request signal, wherein the gear shift request signal includes target gear information; Step 2: Acquire the vehicle's current state information, wherein the vehicle's current state information includes the current gear position of the transfer case, the current gear position of the transmission, the vehicle speed signal, and the brake signal; Step 3: Based on the target gear information and the vehicle current state information, determine whether a gear shifting condition is met; Step 4: When the gear shifting condition is not met, a gear shifting operation reminder message is generated; Step 5: Display the shift operation reminder information in at least one of text, voice or graphics via the vehicle-mounted display terminal.

2. The electronically controlled transfer case shift operation reminder control method according to claim 1, characterized in that: The current gear position and target gear position of the transfer case include H gear, HL gear, N gear and L gear; The current gear position of the transmission includes N gear and non-N gear; The braking signal includes braking effective and braking ineffective.

3. The electronically controlled transfer case shift operation reminder control method according to claim 1, characterized in that: The gear shifting conditions include vehicle speed conditions, braking conditions and transmission gear position conditions; When performing a gear shift operation to a certain target gear, if multiple gear shift conditions are not met, the gear shift operation reminder display priority is: the priority of satisfying the vehicle speed condition is higher than the priority of satisfying the braking condition, and the priority of satisfying the braking condition is higher than the priority of satisfying the power interruption condition.

4. The electronically controlled transfer case shift operation reminder control method according to claim 1, characterized in that: When the target gear is N: First, detect that the vehicle speed of the input signal is greater than The vehicle speed threshold for shifting the transfer case to N gear is stored in advance, and a prompt will pop up on the vehicle instrument panel or other display vehicle terminal to ask the transfer case to shift to N gear and reduce the vehicle speed; If the vehicle speed condition is met, then the vehicle is tested whether the service brake in the input signal is effective. If not, a prompt pops up on the vehicle instrument or other vehicle display terminal to change the transfer case to N gear and to step on the brake pedal. If the service brake is effective, then the vehicle is tested whether the current gear of the transmission is N gear. If the transmission is not in N gear, a prompt pops up on the vehicle instrument or other vehicle display terminal to change the transfer case to N gear and to change the transmission to N gear. If the above three conditions are all met, the transfer case shifting to N gear operation is executed; the shifting operation reminder display priority is that the priority of vehicle speed condition judgment is higher than the priority of braking condition judgment, and the priority of braking condition judgment is higher than the priority of transmission shifting to N gear judgment.

5. The electronically controlled transfer case shift operation reminder control method according to claim 1, characterized in that: When the target gear is H gear: If the current gear is HL, determine whether the vehicle speed is greater than the preset HL to H switching speed threshold; If the current gear is L or N, determine whether the vehicle speed is greater than a preset L or N to H speed switching threshold; When the vehicle speed is greater than the corresponding threshold, a reminder message to reduce the speed is generated; When the vehicle speed is not greater than the corresponding threshold, determining whether the transmission is in the N gear; When the transmission is not in the N gear, a reminder message is generated to shift the transmission into the N gear.

6. The electronically controlled transfer case shift operation reminder control method according to claim 1, characterized in that: When the target gear is HL: If the current gear is H gear, determine whether the vehicle speed is greater than the preset H gear to HL gear switching speed threshold; If the current gear is L or N, determine whether the vehicle speed is greater than a preset L or N to HL switching speed threshold; When the vehicle speed is greater than the corresponding threshold, a reminder message to reduce the speed is generated; When the vehicle speed is not greater than the corresponding threshold, determining whether the transmission is in the N gear; When the transmission is not in the N gear, a reminder message is generated to shift the transmission into the N gear.

7. The electronically controlled transfer case shift operation reminder control method according to claim 1, characterized in that: When the target gear is L: Determine whether the vehicle speed is greater than a preset L gear switching speed threshold; When the vehicle speed is greater than a threshold, a reminder message to reduce the speed is generated; When the vehicle speed is not greater than the threshold, determining whether the transmission is in the N gear; When the transmission is not in the N gear, a reminder message is generated to shift the transmission into the N gear.

8. The electronically controlled transfer case shift operation reminder control method according to claim 1, characterized in that: It also includes abnormal condition handling steps: During the shifting process, the current signal of the transfer case shifting motor, the shifting execution time, the speed difference between the input and output shafts of the transfer case, the temperature signal of the transfer case and the communication signal of the controller are monitored in real time; When it is detected that the current signal exceeds the preset threshold value I1 for a duration of t1, it is determined that the transfer case is stuck, where I1 is 1.2-1.5 times the rated working current and t1 is 200-500 milliseconds; when it is detected that the shift execution time exceeds the preset time threshold t2, it is determined that the shift timeout is exceeded, where t2 is 2-3 seconds; when it is detected that the transfer case temperature signal exceeds the preset temperature threshold T1, it is determined to be overheat protection, where T1 is 120-150 degrees Celsius; when it is detected that the controller communication signal interruption time exceeds the preset time t3, it is determined to be a communication abnormality, where t3 is 100-300 milliseconds; the following processing strategies are selectively executed according to different abnormal working conditions: When the transfer case is stuck, the shift motor is controlled to run in reverse for a preset time t4 before shifting forward, where t4 is 50-100 milliseconds; when the shift timeout occurs, the shift operation is interrupted and the gear is returned to the original gear position; When overheating protection occurs, gear shifting is prohibited and the cooling strategy is activated; when communication abnormalities occur, the transfer case control unit is switched to emergency mode; for any abnormal operating condition, the vehicle operating data at the time of the fault is recorded, including vehicle speed, torque, gear position, axle speed and other information, for fault tracing.

9. An electronically controlled transfer case shift operation reminder control system, applied to the electronically controlled transfer case shift operation reminder control method according to claims 1 to 8, characterized in that: include: a shift switch, for receiving a shift request from a driver and generating a shift request signal including target gear information; A state acquisition unit is used to collect the current state information of the vehicle, including the current gear position of the transfer case, the current gear position of the transmission, the vehicle speed signal and the brake signal; a controller, electrically connected to the shift switch and the state acquisition unit, for determining whether a shift condition is met based on the shift request signal and the current state information of the vehicle, and generating a shift operation reminder message when the shift condition is not met; The display terminal is connected to the controller via a CAN bus, and is used to receive the gear shift operation reminder information and display it in at least one of text, voice or graphics; the gear shift operation reminder information is transmitted between the controller and the display terminal in the form of a CAN message; the display terminal includes an automobile instrument or other vehicle-mounted display device.

10. The electronically controlled transfer case shift operation reminder control system according to claim 9, characterized in that: The controller has pre-stored in its memory vehicle speed threshold data for different gear shifts; The controller is also used to determine the display order of the gear shifting operation reminder information according to a preset display priority, wherein the display priority of the vehicle speed condition is higher than the braking condition, and the display priority of the braking condition is higher than the transmission gear condition; the priority of satisfying the braking condition is higher than the priority of satisfying the power interruption condition.

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