New-energy automobile limping mode control method and system

Abstract

The invention discloses a new-energy automobile limping mode control method and system. The method comprises the steps that if a power battery breaks down, a relay is turned off; if an engine runs, the whole automobile enters a hybrid mode; if the engine is not started, and when a coupler has a disconnection fault, the whole automobile stops; when the coupler has no disconnection fault, the engineis started; under the hybrid mode, according to the working state of a whole automobile motor and a controller, the running state of the engine and the working state of the coupler, the voltage closed-loop stopping state is calculated, and if the voltage closed-loop stopping is activated, the automobile enters the non-voltage closed-loop limping mode; if the voltage closed-loop stopping is not activated, when the rotating speed of the motor is smaller than the preset rotating speed, the automobile enters the non-voltage closed-loop limping mode, and when the rotating speed of the motor is notsmaller than the preset rotating speed, the automobile enters the voltage closed-loop limping mode; according to the method and system, flexible configuration can be performed according to the actualcondition, the redundancy is high, after the power battery failure is cut off, the whole automobile enters the safety controllable mode, and the safety of the whole automobile and passengers is ensured.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a method and system for controlling a limp mode of a new energy vehicle. Background technique [0002] The rapid development of new energy vehicles has made the safety of new energy vehicles face a major test. Therefore, the handling of key faults in new energy vehicles has attracted much attention. A hybrid vehicle usually consists of two power sources, and the driving power is provided by the combination of the two power sources. Therefore, a problem also arises, that is, after a power source fails, especially after a power battery fails, how to switch to another power source for limp driving, so that the whole vehicle enters a safe and controllable mode after the failure, and guarantees The ability of the vehicle to continue to travel reliably to a safe area has become the focus of attention of those skilled in the art. Contents of the invention [0003] In vie...

AI Technical Summary

Problems solved by technology

Therefore, a problem also arises, that is, after a power source fails, especially after a power battery fails, how to switch to another power source for limp driving, so that the whole vehicle enters a safe and controllable mode after the failure, and guarantees The ability of the vehicle to continue to travel reliably to a safe area has become the focus of attention of those skilled in the art

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