Fault diagnosis method for blade electric vehicle vacuum assistance brake system

Abstract

The invention relates to a fault diagnosis method for a blade electric vehicle vacuum assistance brake system. The blade electric vehicle vacuum assistance brake system comprises an HCU, an electric vacuum pump, a vacuum pressure sensor, an instrument, a brake pedal, a relay and a power source, the HCU is in communication interaction with the instrument through a CAN line, and the other parts are connected with the HCU through hard lines. The fault diagnosis method includes the steps that after a blade electric vehicle is powered on, a vehicle control unit collects information of a power source of the vacuum pump in real time, and whether the power source is turned off or not is judged; the vehicle control unit collects change values of the vacuum pressure in real time, and diagnosis on the conditions whether gas is leaked from the vacuum assistance brake system or not, whether the vacuumizing performance is reduced or not and whether the vacuum assistance brake system is in the continuous working state or not is made according to the working states (working and stopping) of the vacuum pump and operation of a driver to a brake. The fault diagnosis method for the blade electric vehicle vacuum assistance brake system is relatively comprehensive, systematic and clear, vacuum fault reasons can be accurately located, the driver can be alerted in time, and the traveling safety of the vehicle is improved.

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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