Method and system for preventing vehicle from moving during tire changing of pure electric vehicle

Abstract

The invention discloses a method and system for preventing a battery electric vehicle from moving during tire changing, the system comprises a central control display screen, an ECU, an electronic stability control system and a gear shifting assembly, the central control display screen, the electronic stability control system and the gear shifting assembly are all connected with the ECU through a CAN bus, the electronic stability control system is electrically connected with two front wheel cylinders, and the gear shifting assembly is electrically connected with the ECU through a CAN bus. And a tire changing mode control soft switch is integrated in the central control display screen. According to the invention, the vehicle can be prevented from shifting when the tire of the pure electric vehicle is replaced or maintained, and the safety during tire replacement or maintenance is effectively ensured.

Description

Technical Field

[0001] The invention relates to a method and a system for preventing a pure electric vehicle from moving when changing tires, and belongs to the technical field of pure electric vehicles. Background Art

[0002] At present, domestic pure electric vehicles basically do not have spare tires, but the regulations for pure electric vehicles exported to some foreign countries require that they must have spare tires, so exported vehicles need to be equipped with spare tires, jacks and other devices.

[0003] When a general fuel vehicle is lifted by a jack, the rear wheels are locked by the EPB and the front wheels are locked by the engine, so all four tires are in a locked state. When changing tires, all four wheels are in a locked state. However, when a pure electric vehicle is parked, only the rear wheel EPB can be locked, and the front wheels are still in a state where they can move freely. When the jack lifts any rear wheel, only the other rear wheel of the three wheels in contact with the ground is in a braking state. In addition, the lifting process causes the center of gravity of the vehicle to shift, and the suspension deforms, causing the vehicle to shift and causing the jack to tilt. Taking the torsion beam model as an example, with the body as a reference, the rear wheels do not move vertically up and down, but move along the arc of the torsion beam. The wheels move up and down and also move forward and backward. During the process of lifting the right rear wheel, the left rear wheel will gradually compress, and the left rear wheel will shift backward relative to the body. Since the left rear wheel is in a braking state, the phenomenon manifested is that the body moves forward and the jack tilts forward, affecting the user's safety. Summary of the invention

[0004] The purpose of the present invention is to provide a method and system for preventing vehicle movement when changing tires of a pure electric vehicle, so as to solve the technical problems in the prior art. The method and system can prevent vehicle displacement when replacing or repairing tires of a pure electric vehicle, and effectively ensure safety when replacing or repairing tires.

[0005] The present invention provides a method for preventing a pure electric vehicle from moving when changing tires, comprising the following steps:

[0006] Turning on the tire changing mode switch, wherein the tire changing mode switch sends an on signal to the ECU;

[0007] After receiving the start signal, the ECU determines whether the vehicle is in the P gear;

[0008] If the vehicle is in the P gear, the ECU sends a control command to the electronic stability control system through the CAN bus, and the electronic stability control system controls the two front wheel cylinders to increase the pressure to a set threshold, and then keeps the pressure of the two front wheel cylinders unchanged and enters a pressure-maintaining state;

[0009] The ECU controls the central control display screen to display a prompt message of the tire change mode;

[0010] After the tire is replaced, the tire changing mode switch is turned off, and the tire changing mode switch sends a shutdown signal to the ECU;

[0011] After receiving the shutdown signal, the ECU sends a control instruction to the electronic stability control system through the CAN bus, and the electronic stability control system controls the two front wheel cylinders to release pressure;

[0012] The ECU controls the central control display screen to display a prompt message indicating that the tire change mode is turned off.

[0013] In the aforementioned method for preventing the vehicle from moving when changing tires of a pure electric vehicle, preferably, after receiving the start signal, the ECU determines whether the vehicle is in the P gear;

[0014] If the vehicle is in a non-P gear, the ECU controls the central control display screen to display a prompt message "Please switch the gear to the P gear", and at the same time, the ECU detects through a gyroscope whether the vehicle body tilt angle exceeds a set threshold;

[0015] If the vehicle body tilt angle exceeds a set threshold, the ECU controls the vehicle to honk.

[0016] In the aforementioned method for preventing the vehicle from moving when changing tires of a pure electric vehicle, preferably, the tire change mode switch is a physical switch and / or a soft switch.

[0017] In the aforementioned method for preventing the vehicle from moving when changing tires of a pure electric vehicle, preferably, the two front wheel cylinders are pressurized to a set threshold, specifically including: controlling the isolation valves on the two front wheel cylinders to close and the liquid inlet valves to open to enter a pressurized state; when the pressure of the two front wheel cylinders reaches the set threshold, the liquid inlet valve is closed to maintain the pressure of the two front wheel cylinders.

[0018] A system for preventing a pure electric vehicle from moving when changing tires comprises a central control display screen, an ECU, an electronic stability control system and a shift assembly, wherein the central control display screen, the electronic stability control system and the shift assembly are all connected to the ECU via a CAN bus, the electronic stability control system is electrically connected to two front wheel cylinders, and a tire change mode control soft switch is integrated in the central control display screen.

[0019] The aforementioned system for preventing the vehicle from moving when changing tires of the pure electric vehicle further includes a gyroscope, and the gyroscope is connected to the ECU via a CAN bus.

[0020] In the aforementioned system for preventing the vehicle from moving when changing tires in the pure electric vehicle, the tire changing mode physical switch is electrically connected to the ECU.

[0021] In the aforementioned system for preventing the vehicle from moving when changing tires of the pure electric vehicle, the horn is electrically connected to the ECU.

[0022] Compared with the prior art, the present invention can pressurize the two front wheel cylinders to lock the two front wheels after the tire changing mode is turned on. In this way, when repairing or replacing the rear wheels of the vehicle, when using a jack to prop up the vehicle, the vehicle will not shift and the jack will not tilt, thereby effectively ensuring the safety of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a system block diagram of the present invention.

[0024] Explanation of reference numerals: central control display screen 1, ECU 2, electronic stability control system 3, shift assembly 4, front wheel cylinder 5, tire change mode control soft switch 6, gyroscope 7, tire change mode physical switch 8, horn 9. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0026] An embodiment of the present invention: A method for preventing a pure electric vehicle from moving when changing tires, comprising the following steps:

[0027] S1, turn on the tire change mode switch, and the tire change mode switch sends an opening signal to the ECU;

[0028] S2, after receiving the start signal, the ECU determines whether the vehicle is in P gear;

[0029] S201, if the vehicle is in the P gear, the ECU sends a control command to the electronic stability control system through the CAN bus, and the electronic stability control system controls the two front wheel cylinders to increase the pressure to a set threshold, and then keeps the pressure of the two front wheel cylinders unchanged to enter the pressure holding state, and then enters step S3;

[0030] The two front wheel cylinders are pressurized to the set threshold value through the following steps:

[0031] S2011, controlling the isolation valves on the two front wheel cylinders to close and the liquid inlet valves to open to enter a pressurization state; when the pressures of the two front wheel cylinders reach a set threshold, the liquid inlet valves are closed to maintain the pressures of the two front wheel cylinders;

[0032] S202, if the vehicle is in a non-P gear, the ECU controls the central control display screen to display a prompt "Please switch the gear to P gear", and at the same time, the ECU detects through the gyroscope whether the vehicle body tilt angle exceeds the set threshold;

[0033] S2021, if the vehicle body tilt angle exceeds the set threshold, the ECU controls the vehicle to honk;

[0034] S3, ECU controls the central control display to display the prompt "tire change mode";

[0035] At this time, the staff can use a jack to support the wheel that needs repair and perform repair operations;

[0036] S4, after the tire is replaced, the tire changing mode switch is turned off, and the tire changing mode switch sends a shutdown signal to the ECU;

[0037] S5, after receiving the shutdown signal, the ECU sends a control command to the electronic stability control system through the CAN bus, and the electronic stability control system controls the two front wheel cylinders to release the pressure;

[0038] In this step, the two front wheel cylinders release pressure by opening the outlet valves thereon, and after the pressure is released, the two front wheels can rotate freely;

[0039] S6, the ECU controls the central control display screen to display the prompt "Tire change mode is off".

[0040] In a specific embodiment, the tire change mode switch is a physical switch and / or a soft switch. The physical switch can be set on the center console, and the soft switch is integrated in the center console display screen. The driver can turn on and off the tire change mode by operating the physical switch or the soft switch on the center console display screen.

[0041] In this embodiment, the purpose of determining whether the vehicle is in the P gear is that only when the vehicle is in the P gear, the two rear wheels are in a locked state due to the EPB motor boost, while when the vehicle is in other gears, the rear wheels are not locked and the vehicle can still move.

[0042] Detecting the tilt angle of the vehicle body by using a gyroscope can prevent the staff from propping up the vehicle to perform a tire change operation when the vehicle fails to enter the tire change mode. When the tire change mode fails to enter, and the vehicle is not in P gear, and all four wheels are not locked, performing a tire change operation will pose a huge safety hazard.

[0043] like Figure 1 As shown, a system for preventing a pure electric vehicle from moving when changing tires, which implements the above-mentioned method for preventing a pure electric vehicle from moving when changing tires, includes a central control display screen 1, an ECU 2, an electronic stability control system 3 and a shift assembly 4. The central control display screen 1, the electronic stability control system 3 and the shift assembly 4 are all connected to the ECU 2 via a CAN bus, the electronic stability control system 3 is electrically connected to two front wheel cylinders 5, and a tire change mode control soft switch 6 is integrated in the central control display screen 1.

[0044] In this embodiment, it also includes a gyroscope 7, a tire change mode physical switch 8 and a speaker 9. The gyroscope 7 is connected to the ECU2 via a CAN bus; the tire change mode physical switch 8 and the speaker 9 are both electrically connected to the ECU2.

[0045] When it is necessary to change tires, the driver turns on the tire change mode control soft switch 6 or the tire change mode physical switch 8, and the tire change mode control soft switch 6 or the tire change mode physical switch 8 sends a tire change mode start signal to ECU2. At this time, ECU2 detects the current gear position of the shift assembly 4. If the gear position is not the P gear position, the prompt "Please switch the gear position to the P gear" is displayed on the central control display screen 1. At the same time, ECU2 detects whether the vehicle body tilt angle exceeds the set threshold through the gyroscope 7. If the vehicle body tilt angle exceeds the set threshold, ECU controls the vehicle to honk; if ECU2 detects that the current gear position of the shift assembly 4 is the P gear, ECU2 sends a control instruction to the electronic stability control system 3, and the electronic stability control system 3 controls the isolation valves on the two front wheel cylinders 5 to close and the inlet valves to open to enter the boost state. state, when the pressure is increased to the set threshold, the liquid inlet valve is closed, and the pressure of the two front wheel cylinders 5 is kept unchanged to enter the pressure holding state; ECU2 controls the central control display screen 1 to display the prompt of "tire changing mode"; at this time, the staff can use the jack to prop up the wheel that needs to be repaired. After replacing the tire, the driver turns off the tire changing mode control soft switch 6 or the tire changing mode physical switch 8, and the tire changing mode control soft switch 6 or the tire changing mode physical switch 8 sends a tire changing mode closing signal to ECU2. After receiving the closing signal, ECU2 sends a control instruction to the electronic stability control system 3, and the electronic stability control system 3 controls the liquid outlet valves on the two front wheel cylinders 5 to open and release the pressure. After the pressure is released, the two front wheels can rotate freely; ECU2 controls the central control display screen to display the prompt of "tire changing mode closed".

[0046] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made according to the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.

Claims

1. A method for preventing a pure electric vehicle from moving when changing tires, characterized in that: The following steps are involved: Turning on the tire changing mode switch, wherein the tire changing mode switch sends an on signal to the ECU; After receiving the start signal, the ECU determines whether the vehicle is in the P gear; If the vehicle is in the P gear, the ECU sends a control command to the electronic stability control system through the CAN bus, and the electronic stability control system controls the two front wheel cylinders to increase the pressure to a set threshold, and then keeps the pressure of the two front wheel cylinders unchanged and enters a pressure-maintaining state; The ECU controls the central control display screen to display a prompt message of the tire change mode; After the tire is replaced, the tire changing mode switch is turned off, and the tire changing mode switch sends a shutdown signal to the ECU; After receiving the shutdown signal, the ECU sends a control instruction to the electronic stability control system through the CAN bus, and the electronic stability control system controls the two front wheel cylinders to release pressure; The ECU controls the central control display screen to display a prompt message indicating that the tire change mode is turned off.

2. The method for preventing a pure electric vehicle from moving when changing tires according to claim 1, characterized in that: After receiving the start signal, the ECU determines whether the vehicle is in the P gear; If the vehicle is in a non-P gear, the ECU controls the central control display screen to display a prompt message "Please switch the gear to the P gear", and at the same time, the ECU detects through a gyroscope whether the vehicle body tilt angle exceeds a set threshold; If the vehicle body tilt angle exceeds a set threshold, the ECU controls the vehicle to honk.

3. The method for preventing a pure electric vehicle from moving when changing tires according to claim 1, characterized in that: The tire change mode switch is a physical switch and / or a soft switch.

4. The method for preventing a pure electric vehicle from moving when changing tires according to claim 1, characterized in that: The two front wheel cylinders are pressurized to a set threshold value, specifically comprising: controlling the isolation valves on the two front wheel cylinders to close and the liquid inlet valves to open to enter a pressurized state; when the pressure of the two front wheel cylinders reaches the set threshold value, the liquid inlet valve is closed to achieve pressure maintenance of the two front wheel cylinders.

5. A system for preventing a pure electric vehicle from moving when changing tires, characterized in that: It includes a central control display screen, an ECU, an electronic stability control system and a shift assembly. The central control display screen, the electronic stability control system and the shift assembly are all connected to the ECU through a CAN bus. The electronic stability control system is electrically connected to two front wheel cylinders. A tire change mode control soft switch is integrated in the central control display screen.

6. The system for preventing a pure electric vehicle from moving when changing tires according to claim 5, characterized in that: It also includes a gyroscope, which is connected to the ECU via a CAN bus.

7. The system for preventing a pure electric vehicle from moving when changing tires according to claim 5, characterized in that: The tire change mode physical switch is electrically connected to the ECU.

8. The system for preventing a pure electric vehicle from moving when changing tires according to claim 5, characterized in that: The speaker is electrically connected to the ECU.

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