A gear shifting method for AMT transmission system

Abstract

The present invention discloses a shifting method for an AMT gearbox system, comprising: determining the current gear position upon receiving a gear shifting request; sending a gear shifting instruction for controlling a gear shifting lever to be pushed from the current gear position to a first control point along a first direction to a gear shifting power source according to the current gear position; sending a gear shifting instruction for controlling the gear shifting lever to continue to be pushed along the first direction to a second control point to the gear shifting power source; sending a gear shifting instruction for controlling the gear shifting lever to continue to be pushed along the first direction to a target point to the gear shifting power source; and sending a torque instruction after successful gear shifting to the system power source when the target point is reached. The present invention completes a fast and accurate whole gear shifting process, and improves the service life of various mechanical components inside the gearbox.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicles, and in particular to a shifting method for an AMT transmission system. Background Art

[0002] With the development of new energy vehicles, pure electric AMT systems are increasingly being used in the commercial vehicle field due to their features of taking into account high and low vehicle speeds, large climbing gradients, and low labor intensity. During the gear shifting process, the gear shifting quality directly affects the gear shifting reliability and the comfort of the entire vehicle. If the gear shifting process is delayed or unsuccessful, in addition to affecting the driving experience, it will also seriously affect the safety of the entire vehicle.

[0003] The shifting process of existing AMT transmission systems all adopts fuzzy control, and no specific shifting control research is conducted on the mechanical structure of the transmission itself. This leads to problems such as long shifting time, large shifting shock, and poor shifting accuracy.

[0004] Therefore, the prior art urgently needs a shift control solution that can solve one or more of the above-mentioned technical problems. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a shifting method for an AMT transmission system, including: step 1, determining the current gear position when a shifting request is received; step 2, sending a first shifting instruction to a shifting power source according to the current gear position to control the shifting lever to be pushed from the current gear position along a first direction to a first control point, the first control point being a position corresponding to when a self-locking screw first contacts a synchronous ring of the shifting lever; step 3, sending a second shifting instruction to the shifting power source to control the shifting lever to continue to be pushed along the first direction to a second control point, the second control point being a position corresponding to the self-locking screw when the synchronous ring reaches a tightened state; step 4, sending a third shifting instruction to the shifting power source to control the shifting lever to continue to be pushed along the first direction to a target point; step 5, sending a torque instruction to the system power source when the target point is reached.

[0006] Preferably, in step one, if a shift request is received, it is determined whether the vehicle is in a parking state. If the vehicle is in a parking state, the process proceeds to step two. If the vehicle is in a non-parking state, a fourth shift instruction is sent to the shift power source for controlling the shift lever to be pushed from the current gear position along a first direction to a neutral position point. After the shift lever reaches the neutral position point, the target speed and the corresponding target torque are calibrated for the system power source, thereby proceeding to step two.

[0007] Preferably, the method further comprises: respectively detecting abnormalities in pushing from the current gear to the first control point, abnormalities in pushing to the second control point, and abnormalities in pushing to the target point, and processing corresponding abnormalities.

[0008] Preferably, in the process of detecting the pushing abnormality from the current gear position to the first control point, it includes: when the shift lever reaches the first control point, calculating the first speed difference between the relative speed of the gearbox output shaft at the current first control point and the feedback speed of the system power source; judging whether the first speed difference is within a preset first gear shift stage speed difference range threshold, thereby determining whether the current first gear shift stage is normal according to the judgment result, wherein if it is satisfied, no abnormality occurs in the current first gear shift stage, thereby entering the step three.

[0009] Preferably, if the first speed difference exceeds the speed difference range threshold of the first gear shifting stage, an abnormality occurs in the current first gear shifting stage, and the target speed and target torque of the system power source are recalibrated.

[0010] Preferably, the step of detecting an abnormality in the process of pushing toward the second control point includes: detecting the position of the shift lever in real time, determining whether the shift lever reaches the second control point within a preset second shift stage diagnostic time threshold, and determining whether the current second shift stage is normal based on the determination result, wherein if it reaches the second shift stage, no abnormality occurs in the current second shift stage, and entering step four.

[0011] Preferably, if the shift lever does not reach the second control point within the second shift stage diagnostic time threshold, an abnormality occurs in the current second shift stage, the first initial position is marked, and a fifth shift force instruction is sent to the shift power source to control the shift power source to push the shift lever in a second direction, which is opposite to the first direction; the shift dial position is detected in real time to determine whether the difference between the shift lever position corresponding to the preset second shift stage initial detection time threshold and the first initial position reaches the preset second shift stage initial detection position difference threshold, and whether the abnormality handling of the current second shift stage is valid is determined based on the judgment result, wherein if it exceeds, the current abnormality handling is valid, and the step three is re-entered.

[0012] Preferably, if the difference between the corresponding shift lever position and the first initial position after the initial detection time threshold of the second shift phase does not reach the initial detection position difference threshold of the second shift phase, the current initial abnormal processing is invalid; mark the second initial position, and continue to send the sixth shift force instruction to the shift power source to control the shift power source to continue to push the shift lever in the second direction after increasing the preset speed increment; detect the shift dial position in real time to determine whether the difference between the corresponding shift lever position and the second initial position after the preset second shift phase secondary detection time threshold and exceeds the preset second shift phase secondary detection position difference threshold, and determine whether the current second shift phase abnormal processing is valid based on the judgment result, wherein, if it exceeds, the current secondary abnormal processing is valid, thereby re-entering the step three.

[0013] Preferably, the abnormality detection step in the process of pushing to the target point includes: real-time detection of the shift lever position, judging whether the shift lever reaches the target point within a preset third shift stage diagnostic time threshold, and determining whether the current third shift stage is normal based on the judgment result, wherein if it reaches the target point, no abnormality occurs in the current third shift stage, and the process goes to step five.

[0014] Preferably, if the shift lever does not reach the target point within the third shift stage diagnosis time threshold, an abnormality occurs in the current third shift stage, the third initial position is marked, and a seventh shift force instruction is sent to the shift power source to control the shift power source to push the shift lever in a second direction, which is opposite to the first direction; the shift dial position is detected in real time to determine whether the difference between the shift lever position corresponding to the preset third shift stage initial detection time threshold and the third initial position exceeds the preset third shift stage initial detection position difference threshold, and whether the abnormality handling of the current third shift stage is valid is determined based on the judgment result, wherein if it exceeds, the current abnormality handling is valid, and the step four is re-entered.

[0015] Preferably, if the difference between the shift lever position corresponding to the initial detection time threshold of the third shift stage and the third initial position does not reach the initial detection position difference threshold of the third shift stage, the current initial abnormal processing is invalid; mark the fourth initial position, and continue to send the eighth shift force instruction to the shift power source to control the shift power source to continue to push the shift lever in the second direction after increasing the preset speed increment; detect the shift dial position in real time to determine whether the difference between the shift lever position corresponding to the third shift stage secondary detection time threshold and the fourth initial position exceeds the preset third shift stage secondary detection position difference threshold, and determine whether the abnormal processing of the current third shift stage is valid based on the judgment result, wherein, if it exceeds, the current secondary abnormal processing is valid, thereby re-entering the step four.

[0016] Preferably, when the secondary abnormality processing in the second shifting stage or the third shifting stage is invalid, a fault signal is generated and the system is shut down.

[0017] Preferably, the step of calibrating the target speed and the corresponding target torque for the system power source includes: calculating the target speed and the corresponding target torque corresponding to the system power source when the shift lever reaches the target gear position, and generating a speed control instruction containing the target speed information; sending the current speed control instruction to the system power source, and controlling the power source to reach the target speed according to a preset speed control curve; detecting the feedback speed of the system power source, and when the feedback speed reaches the target speed, the control system power source switches from the speed control mode to the torque control mode; sending a torque control instruction for adjusting the current torque to the system power source, and controlling the power source to reach the target torque, and the torque control instruction contains the target torque information; detecting the output torque fed back by the system power source, and when the feedback torque reaches the target torque, completing the calibration, thereby entering the step two.

[0018] Preferably, before sending a fourth shift instruction to the shift power source for controlling the shift lever to be pushed from the current gear position along the first direction to the neutral position point, it also includes: sending a torque control instruction to the system power source for reducing the current torque, so that the torque of the system power source is reduced to a preset shift allowable torque range threshold according to a preset slope.

[0019] Compared with the prior art, one or more embodiments of the above scheme may have the following advantages or beneficial effects:

[0020] The present invention provides a shifting method for an AMT gearbox system. In the entire shifting process from the current gear position of the vehicle to the target gear position, the method fully combines the structure of the internal mechanical components of the gearbox and the characteristics of the shifting principle, divides the entire shifting stage into multiple sub-stages, and then performs refined shifting control for each sub-stage, and performs specific detection and corresponding abnormal processing for the shifting abnormality of each sub-stage. In this way, the present invention completes a fast and accurate entire shifting process, can timely detect the faults of the internal components of the gearbox system, is conducive to improving the service life of the internal mechanical components of the gearbox, solves the problem of abnormal shifting impact during the shifting process, and at the same time, improves the safety of the shifting process.

[0021] Although the present invention will be described below in conjunction with some exemplary implementations and methods of use, it should be understood by those skilled in the art that it is not intended to limit the present invention to these embodiments. On the contrary, it is intended to cover all substitutes, modifications and equivalents within the spirit and scope of the present invention defined by the appended claims.

[0022] Other advantages, objectives, and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the following description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the internal structure of an AMT transmission system in a shifting method for an AMT transmission system according to an embodiment of the present application.

[0025] Figure 2 This is a step diagram of the shifting method for an AMT transmission system according to an embodiment of the present application.

[0026] Figure 3 This is a flowchart of the first example of a shifting method for an AMT transmission system according to an embodiment of the present application.

[0027] Figure 4 This is a flowchart of the second example of the shifting method for an AMT transmission system according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] The following will describe the implementation methods of the present invention in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that as long as there is no conflict, the various embodiments of the present invention and the various features in the embodiments can be combined with each other, and the technical solutions formed are all within the protection scope of the present invention.

[0029] Meanwhile, in the following description, many specific details are set forth for the purpose of explanation to provide a thorough understanding of the embodiments of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the specific details or the specific manner described herein.

[0030] With the development of new energy vehicles, pure electric AMT systems are increasingly being used in the commercial vehicle field due to their features of taking into account high and low vehicle speeds, large climbing gradients, and low labor intensity. During the gear shifting process, the gear shifting quality directly affects the gear shifting reliability and the comfort of the entire vehicle. If the gear shifting process is delayed or unsuccessful, in addition to affecting the driving experience, it will also seriously affect the safety of the entire vehicle.

[0031] The shifting process of existing AMT transmission systems all adopts fuzzy control, and no specific shifting control research is conducted on the mechanical structure of the transmission itself. This leads to problems such as long shifting time, large shifting shock, and poor shifting accuracy.

[0032] Therefore, in order to solve the above technical problems, the present invention proposes a shifting method for an AMT gearbox system, which is completed by a gearbox control unit in the system. Specifically, first, when there is a gear shifting demand, the current gear shifting head position is detected and the current gear position is determined; then, a first shifting instruction is sent to the gear shifting power source, so that the gear shifting rod is pushed from the current gear position to the first control point along the first direction (starting from the current position and heading toward the target point) under the control of the power source; then, a second shifting instruction is sent to the gear shifting power source, so that the gear shifting rod continues to be pushed along the first direction to the second control point under the control of the power source; then, a third shifting instruction is sent to the gear shifting power source, so that the gear shifting rod continues to be pushed along the first direction to the target gear position under the control of the power source; finally, when the gear shifting rod reaches the target gear position, a torque (control) instruction after the gear shifting is successful is sent to the system power source, thereby completing the entire gear shifting process. In this way, the present invention fully combines the structural characteristics of the gearbox itself, controls the entire gear shifting process from the starting point to the target point in stages, and solves the problem of long gear shifting time and / or large impact caused by the gear shifting control method.

[0033] In addition, the present invention also adds gear shift abnormality detection during the execution of each gear shift stage and responds to the corresponding abnormalities, which can timely discover the failure of the gear shift execution or control components, improve the service life of various mechanical components inside the transmission system, and improve the safety and success rate of the gear shift operation.

[0034] Before describing the shifting method of the present invention, the structure of the AMT transmission system as the application environment of the embodiment of the present invention is described first.

[0035] Figure 1 Schematic diagram of the internal structure of the AMT transmission system in the shifting method for the AMT transmission system according to the embodiment of the present application. Figure 1 As shown, the AMT transmission system includes: a shift actuator, a position detection device, a transmission control unit, a shift lever and a system power source (system power unit).

[0036] The shift actuator includes: a shift power source and a shift knob. The shift power source drives the shift knob to move left and right through power output (the power output capacity and direction are adjustable) to achieve the shifting action. The position detection device is used to detect the actual position of the shift knob in real time and transmit it to the transmission control unit. The transmission control unit is responsible for the command transmission and data storage calculation of the entire AMT transmission system. The shift lever is an internal part of the transmission. By adjusting its position through the transportation of the shift knob, the conversion of different working gear pairs in the transmission can be achieved. The system power unit (system power source) is the power source of the entire AMT transmission system, which can be selected from one of the power devices such as the engine and the motor.

[0037] refer to Figure 1 , combined with the structure of the gearbox itself and the shifting action, in the embodiment of the present invention, four special gear positions are calibrated. The first position is the current gear position, which is used to describe the position state of the current gear lever self-locking screw of the gearbox; the second position is the target gear position (target point), which is used to describe the target position of the shifting action; the third position is the first control point, which is used to describe the first characteristic position point experienced during the shifting process from the current gear position to the target gear position. Among them, the first control point is the position of the gear lever self-locking screw corresponding to when the gear lever self-locking screw first contacts the synchronizer ring (inside the gear lever). The fourth position is the second control point, which is used to characterize the second characteristic position point experienced after leaving the first characteristic position point during the shifting process from the current gear position to the target gear position. The second control point is located between the first control point and the target gear position. Among them, the second control point is the position of the gear lever self-locking screw when the synchronizer ring (inside the gear lever) reaches the compressed state during the push from leaving the first control point to the second control point.

[0038] Furthermore, the position of the self-locking screw of the shift lever is fed back to the gearbox control unit in real time through the above-mentioned position detection device. The gearbox control unit can control the shift power source to push the shift knob, and can also control the system power unit. In addition, the gearbox control unit is also used to detect the speed signal of the gearbox output shaft in real time through the gearbox output shaft speed sensor, thereby obtaining the speed (data) of the gearbox output shaft.

[0039] Figure 2 This is a step diagram of the shifting method for the AMT transmission system of the present application embodiment. Figure 1 and Figure 2 , the shifting method described in the present invention is explained.

[0040] Step S210: When the gearbox control unit receives the gear shift request, it detects the current gear shift knob position (the position of the gear shift lever self-locking screw) and determines the current gear position. When the gearbox control unit receives the gear shift request instruction, it immediately sends a corresponding gear shift force instruction to the gear shift power source, so that the gear shift power source adjusts the real-time position of the gear shift lever by pushing the gear shift knob.

[0041] Step S220: Based on the current gear position obtained in step S210, the gearbox control unit sends a signal to the gear shift power source for controlling the gear shift lever to move from the current gear position along the first direction (reference Figure 1 , from left to right) to the first control point, so that the shift lever, under the control of the shift power source, pushes the shift lever from the current gear position to the first control point at a pushing speed consistent with the first speed curve, so that the first control point on the shift lever contacts the self-locking screw, and the shift lever reaches the first control point smoothly. Among them, the first speed curve is a speed map curve under the mechanical conditions inside the system that the shift lever needs to meet when it is pushed normally from the current gear position to the first control point. The curve contains information about the movement speed change law at different moments that needs to be met during the movement from the starting point to the end point, so that the first speed curve can be used to control the pushing speed at different moments during the movement from the current gear position to the first control point.

[0042] Step S230: The gearbox control unit sends a second shift instruction to the shift power source for controlling the shift lever to continue to be pushed from the current gear position (the first control point in this embodiment) to the second control point along the first direction at the pushing speed of the second speed curve, so that the shift lever is pushed from the current gear position to the second control point at a pushing speed consistent with the second speed curve under the control of the shift power source, so that the second control point on the shift lever contacts the self-locking screw, and the shift lever reaches the second control point smoothly. Among them, the second speed curve is a speed map curve under the mechanical conditions of the system that needs to be met when the shift lever is pushed to the second control point under normal conditions. The curve contains information on the movement speed change law at different times that needs to be met during the movement from the starting point to the end point, so that the second speed curve can be used to control the pushing speed at different times during the movement from the current gear position to the second control point.

[0043] Step S240: When the gearbox control unit detects that the shift lever reaches the second control point, a third shift instruction is sent to the shift power source for controlling the shift lever to continue to be pushed from the current gear position (the second control point in this embodiment) along the first direction to the target gear position according to the pushing speed of the third speed curve, so that the shift lever, under the control of the shift power source, pushes the self-locking screw of the shift lever from the current gear position to the target gear position at a pushing speed consistent with the third speed curve, so that the target gear position on the shift lever contacts the self-locking screw, and the shift lever reaches the target gear position smoothly. The third speed curve is a speed map curve under the mechanical conditions of the system that the shift lever needs to meet when it is pushed from the second control point to the target gear position normally. The curve contains information on the movement speed change law at different times that needs to be met during the movement from the starting point to the end point, so that the third speed curve can be used to control the pushing speed at different times during the movement from the current gear position to the target gear position.

[0044] In step S250, when the gearbox control unit detects that the current shift lever reaches the target gear position, the gear shift is successful, and a torque instruction after the gear shift is successful is sent to the system power source, thereby completing the entire gear shift action.

[0045] In this way, the present invention fully combines the structural characteristics of the gearbox itself through the above-mentioned steps S210 to S250, and performs fine control on the entire gear shifting process in stages. In order to meet the internal mechanical operating conditions of the gearbox in each gear shifting stage, a corresponding driving speed control curve is set, so that each gear shifting stage can follow the gear shifting speed that meets the mechanical conditions of the corresponding stage, thereby improving the service life of various mechanical components inside the gearbox, solving the problem of gear shifting impact and abnormal noise in the gear shifting process, and realizing fast and accurate gear shifting action.

[0046] Furthermore, in actual application, the gear shifting action of the transmission system may be started in the parking state or in the non-parking state (while the vehicle is driving). Therefore, in order to adapt to the gear shifting process in different application scenarios, the embodiment of the present invention needs to immediately detect the current operating status of the vehicle after receiving the gear shifting request.

[0047] Figure 3 This is a flowchart of the first example of a shifting method for an AMT transmission system according to an embodiment of the present application.

[0048] like Figure 3As shown, when the gearbox control unit receives a gear shift request, step S301 detects the current gear shift knob position and determines the current gear position, thereby entering the above-mentioned step S302. In step S302, the gearbox control unit obtains the operating status information of the current vehicle and determines whether the current vehicle is in a parking state. In addition, before the implementation of step S301, the gear shift method described in the embodiment of the present invention also includes step S300. In step S300, the gearbox control unit detects in real time whether the current vehicle has a gear shift demand. Among them, when there is a gear shift demand, it enters step S301. When there is no gear shift demand, it enters step S309, and the gearbox control unit will control the gear shift power source to keep the position of the gear shift knob unchanged.

[0049] Further, when the current vehicle is in a parking state, the process proceeds to step S305.

[0050] Further, when the current vehicle is in a non-parking state, the process proceeds to step S303. In step S303, based on the current gear position obtained in step S301, the gearbox control unit sends a fourth shift instruction to the shift power source for controlling the shift lever to be pushed from the current gear position to the neutral position point along the first direction according to the fourth speed curve, so that the shift lever is pushed from the current gear position to the neutral position point at a pushing speed consistent with the fourth speed curve under the control of the shift power source, so that the neutral position point on the shift lever contacts the self-locking screw, and the shift lever smoothly reaches the neutral position point. At this time, the neutral position point is used as the current gear position of the system. Among them, the fourth speed curve is a speed map curve under the internal mechanical conditions of the system that the shift lever needs to meet when it is pushed normally from the current gear position to the neutral position point. The curve contains information on the movement speed change law at different times that needs to be met during the movement from the starting point to the end point, so that the fourth speed curve can be used to control the pushing speed at different times during the movement from the current gear position to the neutral position point.

[0051] In addition, in order to ensure safe shifting in the parking state and further improve the life of the internal mechanical components of the system when the shift is implemented, before the above step S303 is implemented, the torque of the system power unit needs to be reduced to a certain set range according to the calibrated slope. Specifically, the gearbox control unit will send a torque control instruction for reducing the current torque to the system power source, so that the current torque of the system power source is reduced to the preset shift allowable torque range threshold according to the preset slope. It should be noted that the shift allowable torque range threshold represents the torque allowable range required for the system power source when the shift lever is pushed from the current gear position to the neutral position point in the parking state, and the present invention does not specifically limit the range threshold.

[0052] After the fourth shift command is sent, the process proceeds to step S304. In step S304, the gearbox control unit detects the position of the shift lever in real time, and after detecting that the shift lever has reached the neutral position, calibrates the target speed and the corresponding target torque for the system power source, and after completing the calibration, the process proceeds to step S305. Thus, by calibrating the target speed and target torque of the system power source, a safe shift action is guaranteed in the non-parking state, and the life of the internal mechanical components of the system is further improved when the shift is implemented.

[0053] In step S304, the process of calibrating the target speed and the corresponding target torque for the system power source is implemented according to the following steps. First, (step 1, not shown) the target speed and the corresponding target torque corresponding to the system power source when the shift lever reaches the target gear position are calculated, and a speed control instruction containing information about the target speed and the target torque is generated. Specifically, the gearbox control unit will calculate the target speed corresponding to the system power source when the shift lever reaches the target gear position according to the neutral relative speed of the output shaft of the gearbox when the shift lever reaches the neutral position, and the gear ratio between the target gear position and the neutral position, so as to calculate the target torque (range) adapted to the current target speed according to the target speed, combined with the parameters of the system power source and the transmission law required by each mechanical component in the system to meet the normal gear adjustment state, and generate a speed control instruction containing information about the target speed and the target torque range.

[0054] Then, (step 2, not shown) the gearbox control unit will send the current speed control command to the system power source, and control the system power source to reach the target speed according to the preset speed control curve. In the embodiment of the present invention, the speed control curve characterizes the speed change law of the system power source at different times that can be achieved under normal gear shifting conditions. In other words, during the execution of normal gear shifting, without affecting the normal implementation of the gear shifting, the speed control curve reflects the maximum allowable speed change rate that the system power source can achieve at different times, so that the system power source can reach the target speed safely and accurately under the restriction of the speed control curve.

[0055] After the gearbox control unit sends the current speed control command to the system power source to control the target speed of the system power source, it enters step 3 (not shown). (Step 3, not shown) The gearbox control unit detects the real-time speed feedback from the system power source in real time. When the feedback speed reaches the above target speed, the control system power source switches from the speed control mode to the torque control mode, thereby entering step 4 (not shown).

[0056] (Step 4, not shown) The transmission control unit will continue to send a torque control command for adjusting the current torque to the system power source so that the output torque of the system power source reaches the target torque, thereby entering step 5 (not shown). In step 4, the torque control command currently sent to the system power source contains target torque information.

[0057] Step 5 (not shown) The transmission control unit detects the output torque fed back by the system power source in real time, and completes the calibration when the feedback torque reaches the target torque (range).

[0058] In step S305, according to the current gear position (in the parking state, the current gear position is obtained according to step S301; in the non-parking state, the current gear position, i.e., the neutral position point, is obtained according to step S304), the transmission control unit sends the above-mentioned first gear shift instruction to the gear shift power source, so that the gear shift lever, under the control of the gear shift power source, pushes the gear shift lever from the current gear position to the first control point at a pushing speed consistent with the first speed curve until the first control point on the gear shift lever contacts the self-locking screw to adjust the current gear shift lever position to the first control point, thereby entering step S306.

[0059] Step S306 sends the above-mentioned second shift instruction to the shift power source, so that the shift lever, under the control of the shift power source, pushes the shift lever from the current gear position (the first control point in this embodiment) to the second control point at a pushing speed consistent with the second speed curve until the second control point on the shift lever contacts the self-locking screw to adjust the current shift lever position to the second control point, thereby entering step S307.

[0060] Step S307 sends the third shift instruction to the shift power source, so that the shift lever, under the control of the shift power source, pushes the shift lever from the current gear position (the second control point in this embodiment) to the target gear position at a pushing speed consistent with the third speed curve until the target gear position on the shift lever contacts the self-locking screw to adjust the current shift lever position to the target gear position, thereby entering step S308.

[0061] Step S308: When the gearbox control unit detects that the current shift lever has reached the target gear position, the gear shift is successful, and a torque instruction after the gear shift is successful is sent to the system power source. In this way, the whole gear shift action is completed.

[0062] It should be noted that, in this embodiment, the process and principle of step S305 are similar to those of the above-mentioned step S220, the process and principle of step S306 are similar to those of the above-mentioned step S230, the process and principle of step S307 are similar to those of the above-mentioned step S240, and the process and principle of step S308 are similar to those of the above-mentioned step S250, and the present invention will not elaborate on this.

[0063] In addition, in actual application, in order to further improve the service life of various mechanical components inside the transmission system and achieve the purpose of safe shifting in each gear shifting stage, during the implementation of each gear shifting stage, the embodiment of the present invention also needs to check whether there are any abnormalities in the gear shifting action in each stage, and provide corresponding online processing measures for the detected gear shifting abnormalities.

[0064] Figure 4 This is a flowchart of the second example of the shifting method for an AMT transmission system according to an embodiment of the present application.

[0065] like Figure 4 As shown, when the gearbox control unit receives a gear shift request, step S401 detects the current gear shift knob position and determines the current gear position, thereby entering the above-mentioned step S402. In step S402, the gearbox control unit obtains the operating status information of the current vehicle and determines whether the current vehicle is in a parking state. In addition, before the implementation of step S401, the gear shift method described in the embodiment of the present invention also includes step S400. In step S400, the gearbox control unit detects in real time whether the current vehicle has a gear shift demand. Among them, when there is a gear shift demand, it enters step S401. When there is no gear shift demand, it enters step S422, and the gearbox control unit will control the gear shift power source to keep the position of the gear shift knob unchanged.

[0066] Further, when the current vehicle is in a parking state, the process proceeds to step S405.

[0067] Further, when the current vehicle is in a non-parking state, the process proceeds to step S403. In step S403, based on the current gear position obtained in step S401, the gearbox control unit sends a fourth shift instruction to the shift power source for controlling the shift lever to be pushed from the current gear position to the neutral position point in the first direction according to the fourth speed curve, so that the shift lever is pushed from the current gear position point to the neutral position point at a pushing speed consistent with the fourth speed curve under the control of the shift power source, so that the neutral position point on the shift lever contacts the self-locking screw, and the shift lever smoothly reaches the neutral position point. At this time, the neutral position point is used as the current gear position of the system.

[0068] In addition, in order to ensure safe shifting in the parking state and further improve the life of the internal mechanical components of the system when the shift is implemented, before the above step S403 is implemented, the torque of the system power unit needs to be reduced to a certain range according to the calibrated slope. Specifically, the gearbox control unit will send a torque control instruction for reducing the current torque to the system power source, so that the current torque of the system power source is reduced to the preset shift allowable torque range threshold according to the preset slope.

[0069] During the fourth shift instruction transmission process, the process proceeds to step S404. In step S404, the gearbox control unit detects the position of the shift lever in real time, and after detecting that the shift lever reaches the neutral position, calibrates the target speed and the corresponding target torque for the system power source, and then proceeds to step S405 after the calibration is completed. Thus, by calibrating the target speed and target torque of the system power source, a safe shift action is guaranteed in the non-parking state, and the life of the internal mechanical components of the system is further improved when the shift is implemented.

[0070] It should be noted that, in this embodiment, the process and principle of step S400 are similar to those of the above-mentioned step S300, the process and principle of step S401 are similar to those of the above-mentioned step S301, the process and principle of step S402 are similar to those of the above-mentioned step S302, the process and principle of step S403 are similar to those of the above-mentioned step S303, and the process and principle of step S404 are similar to those of the above-mentioned step S304, and the present invention will not elaborate on this.

[0071] In order to further improve the service life of various mechanical components inside the transmission system and to achieve safe and accurate gear shifting in each gear shifting stage, in the current embodiment, the transmission control unit will respectively detect the abnormalities in pushing from the current gear position to the first control point, the abnormalities in pushing to the second control point, and the abnormalities in pushing to the target gear position, and perform corresponding processing on the detected abnormal gear shifting actions.

[0072] In step S405, according to the current gear position (in the parking state, the current gear position is obtained according to step S401; in the non-parking state, the current gear position, i.e., the neutral position point, is obtained according to step S404), the transmission control unit sends the above-mentioned first shift instruction to the shift power source, so that the shift lever, under the control of the shift power source, pushes the shift lever from the current gear position to the first control point at a pushing speed consistent with the first speed curve, until the first control point on the shift lever contacts the self-locking screw, so as to adjust the current shift lever position to the first control point, thereby entering step S406 to detect and process the pushing abnormality of the first shift stage. Among them, in the embodiment of the present invention, the first shift stage refers to the stage in which the shift lever (shift dial) is pushed from the current gear position to the first control point. It should be noted that, in this embodiment, step S405 is similar to the process and principle of the above-mentioned step S305, and the present invention will not elaborate on this.

[0073] Step S406: When the transmission control unit detects that the shift lever has reached the first control point, it determines whether the current (first) speed difference is within the preset first shifting stage speed difference range threshold by calculating the first speed difference between the relative speed of the transmission output shaft at the current first control point and the feedback speed of the system power source, thereby determining whether the shifting action of the current first shifting stage is normal (whether an abnormality occurs) based on the judgment result.

[0074] That is to say, in step S406, the gearbox control unit detects the position of the shifting head in real time, and when the shift lever reaches the first control point (i.e., the self-locking screw contacts the first control point of the shift lever), the gearbox relative speed at the current first control point is calculated according to the feedback speed of the current gearbox output shaft and the gear ratio between the target gear position and the first control point; then, the first speed difference between the current gearbox relative speed and the feedback speed output by the system power source is calculated, and it is determined whether the current first speed difference is within the speed difference range threshold of the first shifting stage, so as to determine whether the current first shifting stage is normal according to the judgment result. It should be noted that in the embodiment of the present invention, the speed difference range threshold of the first shifting stage refers to the speed difference allowable range that can be reached by the difference between the speed of the gearbox output shaft at the first control point and the output speed of the system power source when the shift lever can be pushed normally (safely and accurately) from the current position to the first control point, and the present invention does not specifically limit the threshold.

[0075] In step S406, if the current first speed difference value satisfies the speed difference range threshold condition of the first shifting stage, it means that the shifting action of the current first shifting stage is not abnormal, and then the process proceeds to step S407 (entering the second shifting stage). In addition, in step S406, if the current first speed difference value exceeds the speed difference range threshold condition of the first shifting stage, it means that the shifting action of the current first shifting stage is abnormal, and then the process immediately returns to the above step S404 to recalibrate and adjust the two parameters of the target speed and target torque of the system power source.

[0076] It should be noted that, in actual application, the abnormal detection and processing process of the first gear shifting stage is usually used to target the abnormal situation that the gearbox speed exceeds the specified range. In this case, if the gear is forced to engage, the gearbox will be damaged. Therefore, the embodiment of the present invention promptly and effectively detects such abnormal situations in the first gear shifting stage and performs corresponding response processing for the abnormalities.

[0077] In step S407, the gearbox control unit sends the above-mentioned second shift instruction to the shift power source, so that the shift lever, under the control of the shift power source, pushes the shift lever from the current gear position (in this embodiment, if the shift action in the second shift stage is normal, the current gear position is the first control point; if the first abnormality handling action in the second shift stage is effective, the current gear position is the second initial position point; if the second abnormality handling action in the second shift stage is effective, the current gear position is the second stage end position point) to the second control point, until the second control point on the shift lever contacts the self-locking screw, so as to adjust the current shift lever position to the second control point, thereby entering step S408 to detect and process the pushing abnormality in the second shift stage. In this embodiment of the present invention, the second shift stage refers to the stage in which the shift lever (shift dial) is pushed from the current gear position to the second control point. It should be noted that in this embodiment, the process and principle of step S407 are similar to those of step S306 above, and the present invention will not elaborate on this.

[0078] Step S408 determines whether the shifting action in the current second shifting stage is normal by calculating the position change rate of the shift knob within a preset second shifting stage diagnosis time threshold during the process of the shift lever being pushed from the current gear position to the second control point.

[0079] That is to say, in step S408, when the shift lever is pushed from the current gear position to the second control point, the gearbox control unit will detect the position of the shift knob in real time. When the gearbox control unit detects that the shift lever has reached the second control point, it will mark the first start time and start counting the start time. Then, it will be determined whether the shift lever has reached the second control point (i.e., whether the self-locking screw is in contact with the second control point of the shift lever) within the preset second shift stage diagnostic time threshold, thereby determining whether the current second shift stage is normal based on the current judgment result. It should be noted that the embodiment of the present invention does not specifically limit the above-mentioned second shift stage diagnostic time threshold, and those skilled in the art can set it according to actual needs.

[0080] In step S408, if the transmission control unit detects that the shift lever reaches the second control point within the second shift stage diagnosis time threshold, it means that the shift action in the current second shift stage is not abnormal, and the process proceeds to step S414 (entering the third shift stage). In addition, in step S408, if the transmission control unit detects that the shift lever does not reach the second control point within the second shift stage diagnosis time threshold, it means that the shift action in the current second shift stage is abnormal, and the process proceeds to step S409 to process the current shift abnormality (initial abnormality).

[0081] Step S409: When the gearbox control unit detects that the gear shifting action in the current second gear shifting stage is abnormal, the first initial position is immediately marked (in actual application, the first initial position is any position between the first control point and the second control point), and a signal is sent to the gear shifting power source for controlling the gear shifting lever to move from the first initial position along the second direction (reference direction) according to the pushing speed of the fifth speed curve. Figure 1 , from right to left), so that the shift lever, under the control of the shift power source, pushes the shift lever from the first initial position point toward the first control point at a pushing speed consistent with the fifth speed curve. Among them, the fifth speed curve is the speed map curve required for the fault handling state when the shift lever has a pushing failure in the second shift stage and uses the first initial position point as the starting point for reverse pushing. The curve contains information on the law of movement speed changes at different moments that need to be met in the process of pushing from the first initial position point toward the first control point, so that the fifth speed curve can be used to control the pushing speed at different moments in the process of moving in the reverse direction from the first initial position point, so as to achieve the purpose of initial abnormal handling of the current second shift stage. Furthermore, the second direction is opposite to the first direction.

[0082] After the gearbox control unit sends the fifth gear shift command to the system power source, it enters step S410 at the same time. In step S410, the gearbox control unit detects the position of the gear shift lever in real time, and records the second starting time and starts counting the starting time after judging that the first starting time has passed the preset second gear shift stage initial detection time threshold, and whether the difference between the current position of the gear shift lever corresponding to the second starting time and the first initial position (first position) exceeds the preset second gear shift stage initial detection position difference threshold, thereby determining whether the initial abnormality handling of the current second gear shift stage is effective according to the judgment result.

[0083] It should be noted that the embodiment of the present invention does not specifically limit the threshold value of the initial detection time of the second shifting stage, and those skilled in the art can set it according to actual needs. In addition, in the embodiment of the present invention, the threshold value of the initial detection position difference of the second shifting stage refers to the position change amount of the shift lever within the threshold value of the initial detection time of the second shifting stage when the shift lever can be pushed normally (safely and accurately) in the second direction from the second control point, and the present invention does not specifically limit the threshold value.

[0084] In the above step S410, if the transmission control unit detects that the above first position difference reaches or exceeds the position difference threshold value for the first detection in the second gear shifting stage, it means that the first abnormality handling in the current second gear shifting stage is effective, and at this time, the process re-enters step S407 (re-enters the second gear shifting stage). In addition, in step S410, if the transmission control unit detects that the above first position difference does not reach the position difference threshold value for the first detection in the second gear shifting stage, it means that the gear shifting action in the current second gear shifting stage is still abnormal (i.e., the first abnormality handling in the current second gear shifting stage is invalid), and at this time, the process enters step S411 to perform secondary handling on the current gear shifting abnormality.

[0085] Step S411: When the transmission control unit detects that the initial abnormality handling of the current second shifting stage fails, the second initial position point is immediately marked (in actual application, the second initial position point is any position point between the first initial position point and the second control point, and the second initial position point is the end position point of the initial abnormality handling process of the second shifting stage), and the sixth shift force instruction for controlling the shift lever to move from the first initial position along the second direction according to the pushing speed of the sixth speed curve is sent to the shift power source, so that the shift lever, under the control of the shift power source, continues to push the shift lever from the second initial position point along the second direction toward the first control point at a pushing speed consistent with the sixth speed curve. The sixth speed curve is a curve formed by adding a preset speed increment to the speed value corresponding to each moment in the fifth speed curve. In this way, during the process of the shift lever continuing to be pushed from the first initial point along the second direction toward the first control point, the shift lever, under the control of the shift power source, continues to be pushed from the first initial point along the second direction toward the first control point at a pushing speed that matches the sixth speed curve formed by adding a preset speed increment to the fifth speed curve.

[0086] In addition, in step S411, at the end of the secondary abnormality handling process in the second gear shifting stage, regardless of whether the secondary detection is valid, it is necessary to mark the end position point of the second stage at the end of step S411 (in actual application, the end position point of the second stage is any position point between the second initial position point and the second control point).

[0087] Among them, the sixth speed curve is the speed map curve required for the fault handling state when the shift lever has a pushing fault in the second shifting stage and pushes in the reverse direction with the first initial point as the starting point. The curve contains information on the moving speed change law at different moments that needs to be satisfied in the process of pushing from the first initial position point toward the first control point, so that the sixth speed curve can be used to control the pushing speed at different moments in the process of moving in the reverse direction from the first initial position point, so as to achieve the purpose of secondary abnormality handling in the current second shifting stage.

[0088] After the transmission control unit sends the sixth shift command to the system power source, the system simultaneously enters step S412. In step S412, the transmission control unit detects the shift lever position in real time, and determines whether the difference between the current position of the shift lever corresponding to the preset second shift stage secondary detection time threshold from the second starting time and the second initial position (second position) exceeds the preset second shift stage secondary detection position difference threshold, thereby determining whether the secondary abnormality processing of the current second shift stage is effective according to the judgment result.

[0089] It should be noted that the embodiment of the present invention does not specifically limit the above-mentioned second shifting stage secondary detection time threshold, and those skilled in the art can set it according to actual needs. In addition, in the embodiment of the present invention, the above-mentioned second shifting stage secondary detection position difference threshold refers to the position change amount of the shift lever within the second shifting stage secondary detection time threshold when the shift lever can be pushed normally (safely and accurately) in the second direction from the first initial position point, and the present invention does not specifically limit this threshold.

[0090] It should be noted that, in actual application, the abnormality detection and processing process of the second shifting stage is usually used for the abnormal situation that the shift lever cannot reach the specified position. This abnormal situation means that there is a stuck phenomenon in the current shifting stage. Through two consecutive reverse push detection and abnormality processing means, it is necessary to withdraw the shift lever from the current position to avoid the stuck position, and then wait for re-shifting. In addition, the embodiment of the present invention uses the reverse push detection and abnormality processing means for the second shifting stage to timely perform fault warning, and once an abnormality is found, the fault processing mode can be entered.

[0091] In the above step S412, if the transmission control unit detects that the above second position difference reaches or exceeds the second shifting stage secondary detection position difference threshold, it means that the secondary abnormality processing of the current second shifting stage is effective, and at this time, re-enter step S407 (re-enter the second shifting stage). In addition, in step S412, if the transmission control unit detects that the above second position difference does not reach the second shifting stage secondary detection position difference threshold, it means that the shifting action of the current second shifting stage is still abnormal (that is, the secondary processing of the current second shifting stage is invalid), and at this time, enter step S413 to deal with the failure of the secondary processing of the current shifting abnormality.

[0092] In step S413, when the secondary abnormality processing in the second gear shifting stage is invalid, a fault signal is generated and the system is shut down. That is, in step S413, the gearbox control unit generates a first fault signal, reports a fault prompt for the second gear shifting stage, and controls the entire system to shut down, requiring staff to check and repair the faults related to the second gear shifting stage.

[0093] Continue to refer Figure 4 In step S414, the gearbox control unit sends the third shift instruction to the shift power source, so that the shift lever, under the control of the shift power source, pushes the shift lever from the current gear position (in this embodiment, if the shift action in the third shift stage is normal, the current gear position is the second control point; if the first abnormality handling action in the third shift stage is effective, the current gear position is the fourth initial position point; if the second abnormality handling action in the third shift stage is effective, the current gear position is the third stage end position point) to the target gear position until the target gear position on the shift lever contacts the self-locking screw, so as to adjust the current shift lever position to the target gear position, thereby entering step S415 to detect and process the pushing abnormality in the second shift stage. In this embodiment of the present invention, the second shift stage refers to the stage in which the shift lever (shift dial) is pushed from the current gear position to the target gear position. It should be noted that, in this embodiment, the process and principle of step S414 are similar to those of the above step S307, and the present invention will not elaborate on this.

[0094] Step S415 determines whether the shifting action in the current third shifting stage is normal by calculating the position change rate of the shift knob within a preset third shifting stage diagnostic time threshold when the transmission control unit detects that the shift lever is pushed from the current gear position to the target gear position.

[0095] That is, in step S415, when the shift lever is pushed from the current gear position to the target gear position, the gearbox control unit will detect the position of the shift knob in real time. When the gearbox control unit detects that the shift lever has reached the second control point, it will mark the third start time and start counting the start time. Then, it will be determined whether the shift lever has reached the target gear position (i.e., whether the self-locking screw is in contact with the target gear position of the shift lever) within the preset third shift stage diagnostic time threshold, thereby determining whether the current third shift stage is normal based on the current judgment result. It should be noted that the embodiment of the present invention does not specifically limit the third shift stage diagnostic time threshold, and those skilled in the art may set it according to actual needs.

[0096] In step S415, if the transmission control unit detects that the shift lever reaches the target gear position within the third shifting stage diagnosis time threshold, it means that the shifting action in the current third shifting stage is not abnormal, and the process proceeds to step S421. In addition, in step S415, if the transmission control unit detects that the shift lever does not reach the target gear position within the third shifting stage diagnosis time threshold, it means that the shifting action in the current third shifting stage is abnormal, and the process proceeds to step S416 to process the current shifting abnormality (initial abnormality).

[0097] Step S416: When the gearbox control unit detects that the gear shifting action in the current third gear shifting stage is abnormal, the third initial position is immediately marked (in actual application, the third initial position is any position between the second control point and the target gear position), and the seventh gear shifting force instruction for controlling the gear shifting lever to be pushed from the third initial position in the second direction according to the pushing speed of the seventh speed curve is sent to the gear shifting power source, so that the gear shifting lever is pushed from the third initial position point toward the second control point at a pushing speed consistent with the seventh speed curve under the control of the gear shifting power source. Among them, the seventh speed curve is the speed map curve required for the fault handling state when the gear shifting lever is pushed in the reverse direction with the third initial point as the starting point when a pushing failure occurs in the third gear shifting stage. The curve contains information on the moving speed variation law at different moments that needs to be met in the process of pushing from the third initial position point toward the first control point, so that the seventh speed curve can be used to control the pushing speed at different moments in the process of moving in the reverse direction from the third initial position point, so as to achieve the purpose of performing the initial abnormal handling of the current third gear shifting stage.

[0098] After the transmission control unit sends the seventh shift command to the system power source, it enters step S417 at the same time. In step S417, the transmission control unit detects the position of the shift lever in real time, and records the fourth start time and starts counting the start time after the preset third shift stage initial detection time threshold from the third start time, and determines whether the difference between the current position of the shift lever corresponding to the fourth start time and the third initial position (third position) exceeds the preset third shift stage initial detection position difference threshold, thereby determining whether the initial abnormality handling of the current third shift stage is effective according to the judgment result.

[0099] It should be noted that the embodiment of the present invention does not specifically limit the threshold value of the initial detection time of the third shifting stage, and those skilled in the art can set it according to actual needs. In addition, in the embodiment of the present invention, the position difference threshold value of the initial detection of the third shifting stage refers to the position change amount of the shift lever within the threshold value of the initial detection time of the third shifting stage when the shift lever can be pushed normally (safely and accurately) in the second direction from the third initial position point, and the present invention does not specifically limit the threshold value.

[0100] In the above step S417, if the transmission control unit detects that the third position difference reaches or exceeds the position difference threshold value for the first detection of the second gear shifting stage, it means that the first abnormality handling of the current second gear shifting stage is effective, and at this time, the process re-enters step S414 (re-enters the third gear shifting stage). In addition, in step S417, if the transmission control unit detects that the third position difference does not reach the position difference threshold value for the first detection of the third gear shifting stage, it means that the gear shifting action of the current third gear shifting stage is still abnormal (i.e., the first abnormality handling of the current third gear shifting stage is invalid), and at this time, the process enters step S418 to perform secondary handling on the current gear shifting abnormality.

[0101] Step S418: When the transmission control unit detects that the initial abnormality handling of the current third shifting stage fails, the fourth initial position point is immediately marked (in actual application, the fourth initial position point is any position point between the third initial position point and the target gear position point, and the fourth initial position point is the end position point of the initial abnormality handling process of the third shifting stage), and the eighth shift force instruction for controlling the shift lever to move from the third initial position along the second direction according to the pushing speed of the eighth speed curve is sent to the shift power source, so that the shift lever, under the control of the shift power source, continues to push the shift lever from the third initial position point along the second direction toward the second control point at a pushing speed consistent with the eighth speed curve. The eighth speed curve is a curve formed by adding a preset speed increment to the speed value corresponding to each moment in the seventh speed curve. In this way, during the process of the shift lever continuing to be pushed from the third initial point along the second direction toward the second control point, the shift lever, under the control of the shift power source, continues to be pushed from the third initial point along the second direction toward the second control point at a pushing speed that matches the eighth speed curve formed by adding a preset speed increment to the seventh speed curve.

[0102] In addition, in step S418, at the end of the secondary abnormality handling process of the third gear shifting stage, regardless of whether the secondary detection is valid, it is necessary to mark the end position point of the third stage at the end of step S418 (in actual application, the end position point of the third stage is any position point between the fourth initial position point and the target gear position).

[0103] Among them, the eighth speed curve is the speed map curve required for the fault handling state when the shift lever has a pushing fault in the third shifting stage and the third initial point is used as the starting point for reverse pushing. The curve contains information on the moving speed change law at different moments that needs to be satisfied in the process of pushing from the third initial position point toward the second control point, so that the eighth speed curve can be used to control the pushing speed at different moments in the process of reverse moving from the third initial position point, so as to achieve the purpose of secondary abnormal handling of the current third shifting stage.

[0104] After the transmission control unit sends the eighth shift command to the system power source, the system simultaneously enters step S419. In step S419, the transmission control unit detects the shift lever position in real time, and determines whether the difference between the current position of the shift lever corresponding to the preset third shift stage secondary detection time threshold from the fourth starting time and the fourth initial position (fourth position) exceeds the preset third shift stage secondary detection position difference threshold, thereby determining whether the secondary abnormality processing of the current third shift stage is effective according to the judgment result.

[0105] It should be noted that the embodiment of the present invention does not specifically limit the above-mentioned third shifting stage secondary detection time threshold, and those skilled in the art can set it according to actual needs. In addition, in the embodiment of the present invention, the above-mentioned third shifting stage secondary detection position difference threshold refers to the position change amount of the shift lever within the third shifting stage secondary detection time threshold when the shift lever can be pushed normally (safely and accurately) in the second direction from the third initial point, and the present invention does not specifically limit this threshold.

[0106] In the above step S419, if the transmission control unit detects that the fourth position difference reaches or exceeds the second detection position difference threshold of the third shifting stage, it means that the second abnormality processing of the current third shifting stage is effective, and at this time, re-enter step S414 (re-enter the third shifting stage). In addition, in step S419, if the transmission control unit detects that the fourth position difference does not reach the second detection position difference threshold of the third shifting stage, it means that the shifting action of the current third shifting stage is still abnormal (that is, the second processing of the current third shifting stage is invalid), and at this time, enter step S420 to deal with the failure of the second processing of the current shifting abnormality.

[0107] In step S420, when the secondary abnormality processing in the third gear shifting stage is invalid, a fault signal is generated and the system is shut down. That is, in step S420, the gearbox control unit generates a second fault signal, reports a fault prompt in the third gear shifting stage, and controls the entire system to shut down, requiring staff to check and repair the faults related to the third gear shifting stage.

[0108] It should be noted that, in actual application, the abnormality detection and processing process of the third shifting stage is usually used for the abnormal situation that the shift lever cannot reach the specified position. This abnormal situation means that there is a stuck phenomenon in the current shifting stage. Through two consecutive reverse push detection and abnormality processing means, it is necessary to withdraw the shift lever from the current position to avoid the stuck position, and then wait for re-shifting. In addition, the embodiment of the present invention uses the reverse push detection and abnormality processing means for the third shifting stage to timely provide fault warning, and once an abnormality is found, the fault processing mode can be entered.

[0109] In step S421, when the gearbox control unit detects that the current shift lever reaches the target gear position, it indicates that the gear shift is successful, and sends a torque instruction after the gear shift is successful to the system power source. It should be noted that in this embodiment, the process and principle of step S421 are similar to those of the above step S308, and the present invention will not elaborate on this.

[0110] Thus, in this embodiment, a whole set of gear shifting actions is completed through the above steps S401 to S422, which not only realizes a fast and accurate whole set of gear shifting actions, but also can synchronously detect abnormal states of gear shifting actions in different gear shifting stages, so that corresponding abnormalities can be handled when corresponding abnormalities occur, thereby improving the service life of various mechanical components inside the gearbox.

[0111] The present invention proposes a shifting method for an AMT gearbox system. In the entire shifting process from the current gear position of the vehicle to the target gear position, the method fully combines the structure of the internal mechanical components of the gearbox and the characteristics of the shifting principle, divides the entire shifting stage into multiple sub-stages, and then performs refined shifting control for each sub-stage, and performs specific detection and corresponding abnormal processing for the shifting abnormality of each sub-stage. In this way, the present invention completes a fast and accurate whole shifting process, can timely detect the faults of the internal components of the gearbox system, is conducive to improving the service life of the internal mechanical components of the gearbox, solves the problem of abnormal shifting impact during the shifting process, and at the same time, improves the safety of the shifting process.

[0112] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any person familiar with the technology within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

[0113] It should be understood that the embodiments disclosed in the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should be extended to equivalent substitutions of these features understood by ordinary technicians in the relevant field. It should also be understood that the terms used herein are only used for the purpose of describing specific embodiments and are not meant to be limiting.

[0114] The "one embodiment" or "embodiment" mentioned in the specification means that the specific features, structures or characteristics described in conjunction with the embodiment are included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment" or "embodiment" appearing in various places throughout the specification do not necessarily refer to the same embodiment.

[0115] Although the embodiments disclosed in the present invention are as above, the above contents are only embodiments adopted for facilitating the understanding of the present invention and are not intended to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A shifting method for an AMT transmission system, include: Step 1: upon receiving a shift request, determining whether the vehicle is in a parking state, and when in the parking state, determining the current gear position and entering step 2, wherein, when in a non-parking state, sending a fourth shift instruction for controlling the shift lever to be pushed from the current gear position along a first direction to a neutral position point to the shift power source, and after the shift lever reaches the neutral position point, calibrating a target speed and a corresponding target torque for the system power source, thereby entering step 2; Step 2: according to the current gear position, sending a first shift instruction to the shift power source for controlling the shift lever to be pushed from the current gear position along a first direction to a first control point, wherein the first control point is a position corresponding to when the self-locking screw first contacts the synchronous ring of the shift lever; Step 3: sending a second shift instruction to the shift power source for controlling the shift lever to continue to move in the first direction to a second control point, where the second control point is a position corresponding to the self-locking screw when the synchronizer ring reaches a tightened state; Step 4: sending a third shift instruction to the shift power source for controlling the shift lever to continue to be pushed in the first direction to the target point; Step 5: When reaching the target point, sending a torque command to the system power source, wherein the shifting method further includes: The abnormality of pushing from the current gear to the first control point, the abnormality of pushing to the second control point and the abnormality of pushing to the target point are detected respectively, and the corresponding abnormalities are processed, wherein: The step of detecting an abnormality in the process of pushing toward the second control point includes: Real-time detection of the shift lever position, determining whether the shift lever reaches the second control point within a preset second shift stage diagnostic time threshold, and determining whether the current second shift stage is normal according to the determination result, wherein if it reaches the second shift stage, no abnormality occurs in the current second shift stage, and the process proceeds to step 4; If the shift lever does not reach the second control point within the second shift stage diagnosis time threshold, an abnormality occurs in the current second shift stage, the first initial position is marked, and a fifth shift force instruction is sent to the shift power source to control the shift power source to push the shift lever in a second direction, which is opposite to the first direction; Detect the shift lever position in real time, determine whether the difference between the shift lever position corresponding to the first initial position after the preset second shift stage initial detection time threshold reaches the preset second shift stage initial detection position difference threshold, and determine whether the abnormal processing of the current second shift stage is valid based on the judgment result, wherein if it exceeds, the current abnormal processing is valid, and re-enter the step three.

2. The method according to claim 1, It is characterized in that The process of detecting the abnormality of pushing from the current gear position to the first control point includes: When the shift lever reaches the first control point, calculating a first speed difference between the relative speed of the output shaft of the gearbox at the current first control point and the feedback speed of the system power source; It is determined whether the first speed difference is within a preset first shifting stage speed difference range threshold value, thereby determining whether the current first shifting stage is normal according to the determination result, wherein: If the conditions are met, then no abnormality occurs in the current first gear shifting phase, and the process proceeds to step three.

3. The method according to claim 2, It is characterized in that If the first speed difference exceeds the speed difference range threshold of the first gear shifting stage, an abnormality occurs in the current first gear shifting stage, and the target speed and target torque of the system power source are recalibrated.

4. The method according to claim 1, It is characterized in that If the difference between the shift lever position corresponding to the first initial position after the first detection time threshold of the second shifting stage does not reach the first detection position difference threshold of the second shifting stage, the current first abnormality processing is invalid; marking the second initial position, and continuing to send a sixth shift force instruction to the shift power source, so as to control the shift power source to continue to push the shift lever in the second direction after increasing the preset speed increment; Real-time detection of the shift lever position, determination of whether the difference between the shift lever position corresponding to the second initial position after the preset second shift stage secondary detection time threshold exceeds the preset second shift stage secondary detection position difference threshold, and determination of whether the abnormality handling of the current second shift stage is effective according to the determination result, wherein: If it exceeds, the current secondary exception processing is valid, and the process re-enters step three.

5. The method according to claim 1, It is characterized in that The step of detecting anomalies in the process of pushing toward the target point includes: Real-time detection of the shift lever position, determination of whether the shift lever reaches the target point within a preset third shift stage diagnostic time threshold, and determination of whether the current third shift stage is normal based on the determination result, wherein: If it is reached, then no abnormality occurs in the current third gear shifting stage, and the process goes to step five.

6. The method according to claim 5, It is characterized in that If the shift lever does not reach the target point within the third shift stage diagnosis time threshold, an abnormality occurs in the current third shift stage, a third initial position is marked, and a seventh shift force instruction is sent to the shift power source to control the shift power source to push the shift lever in a second direction, which is opposite to the first direction; Detect the shift lever position in real time, determine whether the difference between the shift lever position corresponding to the third shift stage initial detection time threshold and the third initial position exceeds the preset third shift stage initial detection position difference threshold, and determine whether the abnormal processing of the current third shift stage is valid based on the judgment result, wherein, if it exceeds, the current abnormal processing is valid, and re-enter the step four.

7. The method according to claim 6, It is characterized in that If the difference between the shift lever position corresponding to the first detection time threshold of the third shifting stage and the third initial position does not reach the first detection position difference threshold of the third shifting stage, the current first abnormality processing is invalid; marking the fourth initial position, and continuing to send an eighth shift force instruction to the shift power source, so as to control the shift power source to continue to push the shift lever in the second direction after increasing the preset speed increment; Real-time detection of the shift lever position, determination of whether the difference between the shift lever position corresponding to the preset third shift stage secondary detection time threshold and the fourth initial position exceeds the preset third shift stage secondary detection position difference threshold, and determination of whether the abnormality handling of the current third shift stage is effective according to the determination result, wherein: If it exceeds, the current secondary exception processing is valid, and the process re-enters step 4.

8. The method according to claim 4 or 7, It is characterized in that When the secondary abnormality processing in the second shifting stage or the third shifting stage is invalid, a fault signal is generated and the system is shut down.

9. The method according to any one of claims 1 to 4, It is characterized in that The step of calibrating the target speed and the corresponding target torque for the system power source includes: Calculating a target speed and a corresponding target torque of a system power source when the shift lever reaches a target gear position, and generating a speed control instruction containing target speed information; Sending the current speed control instruction to the system power source, and controlling the power source to reach the target speed according to a preset speed control curve; Detecting a feedback speed of a system power source, and when the feedback speed reaches the target speed, the control system power source switches from a speed control mode to a torque control mode; Sending a torque control instruction for adjusting the current torque to a system power source to control the power source to reach the target torque, wherein the torque control instruction contains target torque information; The output torque fed back by the system power source is detected, and when the feedback torque reaches the target torque, the calibration is completed, thereby entering into the step 2.

10. The method according to any one of claims 1 to 4, It is characterized in that Before sending a fourth shift instruction for controlling the shift lever to be pushed from the current gear position to the neutral position point in the first direction to the shift power source, the method further includes: A torque control instruction for reducing the current torque is sent to the system power source, so that the torque of the system power source is reduced to a preset shift-allowable torque range threshold according to a preset slope.

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