Fault diagnosis method for high-voltage system of pure electric bus

Abstract

The invention discloses a fault diagnosis method for a high-voltage system of a pure electric bus. The high-voltage system of the pure electric bus consists of a power battery, a BMS high-voltage acquisition module, a four-in-one motor controller, a motor, an air conditioner, an oil pump, an air pump, a DCDC and a storage battery. A power battery model comprises an SOC, a terminal voltage, an internal resistance and a Pack module; a high-voltage cabinet model is an actuating mechanism for simulating the main and negative battery contactors and the action of the contactors, and completes the control of the main and negative battery contactors by closing and opening instructions from a vehicle control unit; the four-in-one motor controller is a simulation pre-charging contactor, a main motor contactor, an auxiliary pre-charging and an auxiliary contactor, and is an actuator including the contactor operations, and completes the control of the contactors by closing and opening instructions from the vehicle control unit.

Description

Technical field: [0001] The invention relates to a fault diagnosis method for a high-voltage system of a pure electric passenger car, which belongs to the field of fault diagnosis of a high-voltage system of a new energy pure electric passenger car. Background technique: [0002] Pure electric buses are widely used due to their advantages of environmental protection, low noise, economy and easy maintenance. At present, the development of pure electric bus industry has become the consensus of local governments and the automobile industry, and it is also a preferred means of transportation in the construction of civilized cities. [0003] Compared with traditional buses, pure electric buses use electrical systems such as large-capacity power batteries, high-voltage contactors, and high-voltage drive motors, and the system failures caused by them are completely different from traditional buses. The high-voltage cabinet (high-voltage battery power distribution cabinet) and four-...

AI Technical Summary

Problems solved by technology

However, if the high-voltage circuit design is unreasonable or the type selection does not match, it may cause voltage and current overshoot at the moment when the contactor is closed or disconnected, which will damage the contactor and electrical equipment, thereby affecting the safety performance of the vehicle, and in serious cases causing personal injury. Loss of safety and property, ranging from increased cost of replacement parts

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