A Fault Diagnosis Method for Brake-by-Wire System of Multi-axle Commercial Vehicles
A technology of brake-by-wire and system failure, applied in the direction of braking safety system, etc., can solve problems such as affecting the capacity and hydraulic pressure of the master cylinder, causing failure, etc., to achieve the effect of strong applicability, simple and convenient operation, and rapid and comprehensive detection.
Active Publication Date: 2022-04-22
WANXIANGQIANCHAO CO LTD
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Problems solved by technology
[0003] In the existing vacuum-assisted hydraulic braking system, the vacuum booster depends on the vacuum degree of the engine, and when it is controlled in coordination with the regenerative braking, its hydraulic control will affect the master cylinder capacity and hydraulic pressure, and the control brake system will malfunction during use. When the system fails, it is difficult to diagnose the fault, so a fault diagnosis method for multi-axle commercial vehicle brake-by-wire system is proposed
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[0073] see Figure 1-4 , the present invention provides a technical solution: a multi-axis commercial vehicle brake-by-wire system fault diagnosis method, including step A, step B, step C, step D and step E, wherein the detailed steps of step A are as follows:
[0074] A1. Open CSV1 and CSV2;
[0075] A2. Turn on PSV1 and PSV2;
[0076] A3. Close SSV;
[0077] A4. Close TSV;
[0078] A5. Drive MCS1 motor to position S10, drive MCS2 motor to position S10;
[0079] A6. Determine whether the strokes of the MCS1 motor and the MCS2 motor are normal, and if they are normal, go to step A8;
[0080] A8. Drive the MCS1 motor to position S11;
[0081] A9. Read Ps_MC2, Ps_SP1, Ps_SP2 pressure; Ps_MC2 pedal master cylinder 2 chamber pressure; Ps_SP1 build pressure master cylinder 1 pressure; Ps_SP2 pressure build pressure master cylinder 2 pressure;
[0082] A10. Determine whether the pressure of Ps_MC2, Ps_SP1, and Ps_SP2 is within the normal range. If it is within the normal range...
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The invention discloses a fault diagnosis method for a brake-by-wire system of a multi-axis commercial vehicle, including step A, step B, step C, step D and step E, wherein the detailed steps of step A are as follows: A1, open CSV1 and CSV2; A2 , open PSV1 and PSV2; A3, close SSV; A4, close TSV. In the present invention, the fault of the brake-by-wire system of a multi-axis commercial vehicle is detected by a 5-step method, and the double-assist unit, double-MCU, and three-pressure sensor system are used to detect the leakage performance of the motor drive, MCS / MCU pressure building, valve, and wheel cylinder; Motor stroke and judgment pressure threshold are convenient for actual measurement and calibration; dual power unit, dual MCU independent motor drive, pressure building function diagnosis; signal diagnosis of three pressure sensors; analog valve, master cylinder isolation valve, pressure building cylinder isolation valve, test valve, pedal simulation Leakage diagnosis of device and wheel cylinder, fast and comprehensive detection, simple and convenient operation, can quickly find faults, and has strong applicability.
Description
technical field [0001] The invention relates to the technical field of diagnosis methods, in particular to a fault diagnosis method for a brake-by-wire brake system of a multi-axis commercial vehicle. Background technique [0002] The development of multi-axle commercial vehicles puts forward new requirements for the braking system of vehicles. For the braking system of multi-axle commercial vehicles, in order to achieve good cooperation with the regenerative braking system of multi-axle commercial vehicles, the braking safety On the basis of making the regenerative braking system recover as much braking energy as possible. [0003] In the existing vacuum-assisted hydraulic braking system, the vacuum booster depends on the vacuum degree of the engine, and when it is controlled in coordination with the regenerative braking, its hydraulic control will affect the master cylinder capacity and hydraulic pressure, and the control brake system will malfunction during use. When the...
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IPC IPC(8): B60T17/22
CPCB60T17/22
Inventor 刘长运邱宝象任博屈亮亮郑美云段珍珍
Owner WANXIANGQIANCHAO CO LTD