Fault limping control method for hybrid electric vehicle

Abstract

The invention discloses a fault limp control method for a hybrid electric vehicle, which comprises the following steps that: a vehicle control unit judges the fault type according to the detected high-voltage power-off fault information of the vehicle, and then controls the power output mode of the vehicle according to the high-voltage fault type so as to realize the slow running of the vehicle in the fault state. The method has the advantages that the high-voltage power-off faults of the whole vehicle are classified and processed, the vehicle is controlled to run slowly through the limp state in the non-emergency faults, a user is reminded to pull over conveniently by cooperating with an instrument, it is guaranteed that the vehicle is pulled over in time in the high-voltage power-off faults, and the safety of the vehicle and a driver is guaranteed; and the rationality of high-voltage power failure control is improved.

Description

technical field [0001] The invention relates to the field of high-voltage fault control of a hybrid electric vehicle, in particular to a fault limp control method of a hybrid electric vehicle. Background technique [0002] With the development of society and under the macro background, countries all over the world pay more and more attention to technological progress and energy security. Internal combustion engines are gradually replaced by power systems of other energy sources in the field of road transportation, which brings good opportunities for the development of electrified new energy vehicles. . The new energy hybrid electric vehicle is a state in the process of developing from pure internal combustion engine to pure electric power, which uses power battery and internal combustion engine hybrid power to provide power; and new energy hybrid electric vehicle has many controllers due to the use of power battery for power supply, such as : Vehicle controller, battery man...

AI Technical Summary

Problems solved by technology

The new energy hybrid electric vehicle is a state in the process of developing from pure internal combustion engine to pure electric power, which uses power battery and internal combustion engine hybrid power to provide power; and new energy hybrid electric vehicle has many controllers due to the use of power battery for power supply, such as : Vehicle controller, battery management system, engine management system, motor controller, DCDC controller, anti-lock braking system, transmission control unit, electronic stability control system, etc. High-voltage safety issues are more concerned in the industry. In order to ensure the safety of the vehicle more effectively, it is necessary for the vehicle controller to centrally manage high-voltage faults. In the prior art, after a high-voltage fault is detected, it generally controls the vehicle to release high voltage and stop power output, but the vehicle suddenly drops high voltage during driving. It will bring fright to the driver and affect the driver's operation; in addition, the momentary power off to stop the power output will also cause the vehicle to stop in the middle of the road after driving, which will also bring safety hazards. Insufficient storage

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