Reverse gear pre-synchronization control system and control method

Abstract

The invention discloses a reverse gear pre-synchronization control system which comprises a power motor used for driving a vehicle; the motor controller is used for controlling the power motor; the timer is used for accumulating the time when the motor controller sends the forward torque instruction to the power motor; when the vehicle is switched to the reverse gear and the current vehicle speed is zero, the motor controller sends a forward torque instruction to the power motor, the timer synchronously counts preset time, and the motor controller sends a reverse torque instruction to the power motor. According to the reverse gear pre-synchronization control method based on the electric control system, the problem of gear impact on the meshing faces of the driving gear and the driven gear in the gearbox of the electric all-terrain vehicle is solved through the pre-implemented forward torque, the danger of gear tooth part impact and abrasion of the gearbox is reduced, and the service life of the gearbox is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to a reverse control method, more particularly, a reverse pre-synchronization control method based on an electronic control system. BACKGROUND

[0002] The transmission system of a pure electric all-terrain vehicle (ATV) is a key link for the power output of the whole vehicle. The innovation and optimization of the gearbox technology of the pure electric ATV are directly related to the performance and reliability of the vehicle. The automatic transmission of the traditional fuel vehicle is usually equipped with a hydraulic torque converter and a multi-plate clutch. The power engagement and speed coordination are realized by using the flow characteristics of the liquid and the sliding process of the friction plate, which provides necessary buffer for the shifting process. However, in the mechanical automatic transmission configuration of the pure electric ATV, the traditional clutch device and the shifting synchronizer are removed for the purpose of simplifying the structure, reducing the weight and improving the transmission efficiency. Instead, the electric motor rotor and the gearbox input shaft are rigidly connected by means of a spline. Although this design change brings advantages of structure simplification and efficiency improvement, it also introduces new engineering technical challenges.

[0003] The most significant problem comes from the high rotational inertia inherent in the motor rotor. In the electric ATV, when the vehicle is switched from the forward gear to the reverse gear, the output torque of the motor will be reversed instantaneously due to the sudden change in the direction of the motor speed. At this time, the meshing backlash existing in the gearbox gears will cause the meshing surface of the driving gear and the driven gear to change dramatically, from one side of the meshing surface to the other side. This rigid impact at high speed is called gear impact, and its external manifestation is the "gear tooth impact" phenomenon. This not only produces unpleasant noise and impact feeling, but also significantly reduces the reliability and service life of the gearbox in the long run.

[0004] As shown in Figure 1 , the gearbox is provided with a driving gear 4, a driven gear 7, a switching disc 8 and a switching gear 6. As shown in Figure 2 , the first claw part 81 of the switching disc 8 is in contact with the second claw part 61 of the switching gear 6. At this time, the switching disc 8 and the switching gear 6 are in the reverse tooth engagement state. Once the tooth engagement phenomenon occurs, the switching gear 6 and the switching disc 8 cannot be engaged as the motor rotates, thereby causing the "gear tooth impact" phenomenon. SUMMARY

[0005] Therefore, it is necessary to provide a reverse pre-synchronization control method based on an electronic control system in view of the above technical problems.

[0006] In order to solve the above technical problems, the present application adopts the following technical solutions: A reverse pre-synchronization control system, comprising: a power motor for driving a vehicle; a motor controller for controlling the power motor; a timer for counting the time when the motor controller sends the forward torque instruction to the power motor; When the vehicle switches to the reverse gear and the current vehicle speed is zero, the motor controller sends the forward torque instruction to the power motor and the timer starts counting the preset time, and the motor controller sends the reverse torque instruction to the power motor.

[0007] As a preferred embodiment of the application, the motor controller obtains the current vehicle speed by monitoring the speed of the power motor.

[0008] As a preferred embodiment of the application, the preset time is 2S.

[0009] A reverse gear pre-synchronization control method, characterized in that the reverse gear pre-synchronization control method based on an electric control system comprises: Step S1, start; Step S2, the vehicle switches to the reverse gear; Step S3, the motor controller receives the reverse gear signal; Step S4, the motor controller determines the current vehicle speed by the speed of the power motor, and if the current vehicle speed is equal to zero, it enters step S5; Step S5, the motor controller sends the forward torque instruction to the power motor; Step S6, the timer starts counting, and if the timer reaches the preset time, it enters step S7, otherwise it enters step S5 again; Step S7, the motor controller sends the stop forward torque instruction to the power motor; Step S8, the motor controller sends the reverse torque instruction to the power motor; Step S9, enter the reverse state.

[0010] As a preferred embodiment of the application, the preset time is 2S.

[0011] Compared with the prior art, the application has the following beneficial effects: The application provides a reverse gear pre-synchronization control method based on an electric control system, which solves the problem of gear impact between the driving gear and the driven gear in the transmission of the electric all-terrain vehicle by the pre-implementation of the forward torque, reduces the risk of gear impact and wear of the transmission, and improves the service life of the transmission. BRIEF DESCRIPTION OF DRAWINGS

[0012] To more clearly illustrate the solutions in this invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 A schematic diagram of the existing electric ATV gearbox structure; Figure 2 This is a schematic diagram of the engagement of the switching gears and switching disc in the transmission of an existing electric ATV, where the switching gears and switching disc have interlocking teeth. Figure 3 This is a schematic diagram of the reverse gear pre-synchronization control system of the present invention. Figure 4 This is a logic flowchart of the reverse gear pre-synchronization control method of the present invention; Figure 5 This is a schematic diagram of the engagement of the switching gears and the switching disc in an ATV transmission. At this point, the switching gears and the switching disc are perfectly meshed. Detailed Implementation

[0014] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0015] like Figure 3 As shown, the reverse gear pre-synchronization control system includes: The power motor 20 is used to drive the vehicle; Motor controller 10 is used to control the power motor 20; Timer 30 is used to accumulate the time when the motor controller 10 sends a positive torque command to the power motor 20; When the vehicle is switched to reverse gear and the current vehicle speed is zero, the motor controller 10 sends a positive torque command to the power motor 20 and the timer 30 simultaneously counts the preset time. The motor controller 10 also sends a reverse torque command to the power motor 20.

[0016] The motor controller 10 obtains the current vehicle speed by monitoring the rotational speed of the power motor 20.

[0017] like Figure 4 As shown, the reverse gear pre-synchronization control method based on the electronic control system includes: Step S1: Begin; Step S2: Shift the vehicle into reverse gear; Step S3: The motor controller 10 receives the reverse gear signal; Step S4, the motor controller 10 determines the current vehicle speed by the rotating speed of the power motor 20, if the current vehicle speed is equal to zero, then enter step S5; Step S5, the motor controller 10 sends forward torque instruction to the power motor 20, so that the power motor 20 outputs short forward torque, which is used to eliminate the reverse meshing backlash of the switching gear 6 and the switching disc 8, so that the meshing surface of the switching disc 8 is stably attached to the forward driving direction side, and the initial position and stress state are established; Step S6, the timer 30 starts timing, if the timer 30 reaches the preset time, then enter step S7, otherwise enter step S5 again; Step S7, the motor controller 10 sends stop forward torque instruction to the power motor 20; Step S8, the motor controller 10 sends reverse torque instruction to the power motor 20; Step S9, enter the reverse state, at this time, as shown in the figure, the switching disc 8 and the switching gear 6 are perfectly meshed. Figure 5

[0018] It should be noted that in step S6, the preset time is 2S. Of course, this preset time can be adjusted according to the model.

[0019] In addition, in step S7, the motor controller 10 sends smooth reverse torque instruction to the power motor 20, so that the driven wheel starts to reverse smoothly, the vehicle starts smoothly, and the gear impact and gear noise are avoided.

[0020] The reverse pre-synchronization control method based on the electric control system solves the problem of gear impact of the meshing surface of the driving gear and the driven gear in the transmission of the electric all-terrain vehicle by the pre-implementation of the forward torque, reduces the risk of gear impact and wear of the transmission gear, and improves the service life of the transmission.

[0021] Obviously, the above-described embodiments are only part of the embodiments of the present application, not all the embodiments, and the preferred embodiments of the present application are given in the drawings, but do not limit the patent scope of the present application.​

Claims

1. A reverse gear pre-synchronization control system, comprising: The power motor (20) is used to drive the vehicle; Motor controller (10) is used to control the power motor (20); A timer (30) is used to accumulate the time it takes for the motor controller (10) to send a positive torque command to the power motor (20); When the vehicle is switched to reverse gear and the current vehicle speed is zero, the motor controller (10) sends a positive torque command to the power motor (20) and the timer (30) synchronously counts the preset time. The motor controller (10) sends a reverse torque command to the power motor (20).

2. The reverse gear pre-synchronization control system according to claim 1, characterized in that, The motor controller (10) obtains the current vehicle speed by monitoring the rotational speed of the power motor (20).

3. The reverse gear pre-synchronization control system according to claim 1, characterized in that, The preset time is 2 seconds.

4. A method for pre-synchronization control of reverse gear, characterized in that, The aforementioned reverse gear pre-synchronization control method based on an electronic control system includes: Step S1: Begin; Step S2: Shift the vehicle into reverse gear; Step S3: The motor controller (10) receives the reverse gear signal; Step S4: The motor controller (10) determines the current vehicle speed by the rotation speed of the power motor (20). If the current vehicle speed is zero, proceed to step S5. Step S5: The motor controller (10) sends a positive torque command to the power motor (20); Step S6: The timer (30) starts timing. If the timer (30) reaches the preset time, proceed to step S7; otherwise, proceed to step S5 again. Step S7: The motor controller (10) sends a stop positive torque command to the power motor (20); Step S8: The motor controller (10) sends a reverse torque command to the power motor (20); Step S9: Enter reverse mode.

5. The reverse gear pre-synchronization control method based on an electronic control system according to claim 4, characterized in that, The preset time is 2 seconds.

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