A Fault Diagnosis Method for Vacuum Powered Brake System of Pure Electric Vehicle

Abstract

A pure electric vehicle vacuum booster braking system and a fault diagnosis method, the system includes a vehicle control unit (HCU), an electric vacuum pump, a vacuum pressure sensor, an instrument, a brake pedal, a relay and a power supply, and the CAN line is used between the HCU and the instrument For communication and interaction, other parts are connected to the HCU through hard wires. The diagnosis method is as follows: after the electric vehicle is powered on, the vehicle controller collects the power supply information of the vacuum pump in real time to judge whether the power supply is disconnected; the vehicle controller collects the change value of the vacuum pressure in real time, ) and the driver’s operation on the brakes to diagnose whether the vacuum booster system is leaking, the performance of vacuuming is degraded, and whether it is in a continuous working state. The fault diagnosis method of the vacuum boosting system is relatively comprehensive, systematic, and clear, and can accurately locate the cause of the vacuum fault, warn the driver in time, and improve the driving safety of the vehicle.

Description

technical field [0001] The invention belongs to the field of pure electric vehicle control, and in particular relates to a braking system and a fault diagnosis method of a pure electric vehicle. Background technique [0002] Pure electric vehicles have many advantages such as energy saving and environmental protection, and are the product of the combination of many high and new technologies. With the reduction of energy sources and the vigorous advocacy of the government, they will surely have a broad market in the near future. [0003] At present, electric vacuum pumps are commonly used in the braking system of electric vehicles to provide energy for the brake vacuum booster. The electric vacuum pump must be in a continuous working state to ensure the energy of the vacuum source. This method requires high durability and reliability of the electric vacuum pump and shortens its service life. , and waste electric energy. There are also some systems that use a vacuum pressure ...

AI Technical Summary

Problems solved by technology

[0006] In view of the existing situation, the purpose of the present invention is to provide a fault diagnosis method for the vacuum booster braking system of a pure electric vehicle, so as to solve the problem of timely warning the driver when the vehicle braking system fails, and improve the driving safety of the vehicle.

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