System and method for protection against mis-shifting of electric vehicles

Abstract

The invention relates to a mis-shift protection system and method for an electric vehicle. The system comprises a battery pack, an inverter, a motor, a throttle pedal, a brake pedal, a stall switch, a signal acquisition unit, a motor controller and a speed sensor, wherein the motor controller judges whether the electric vehicle is in a mis-shift state according to the acquired gear state and current speed, if yes, the objective torque of the motor is given to be zero, and the inverter is driven to control the output torque of the motor to decay to zero, and if no, an objective torque is determined according to the acquired current throttle depth, braking depth and gear state, and the motor is controlled to adjust the output torque to the objective torque. According to the invention, whether the electric vehicle is in the mis-shift state is judged according to the acquired gear state and the current speed of the motor, if yes, the objective torque of the motor is given to be zero and the power of the motor is controlled to decay, and if no, the motor is controlled to run normally, so that sharp oscillation of the motor, caused by large output current fluctuation during a mis-shift, is effectively avoided and the driving safety of the vehicle is ensured.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, and more specifically, to a protection system and method for mis-shifting of electric vehicles. Background technique [0002] The development of internal combustion engine vehicles, especially automobiles, is one of the most significant achievements of modern industrial technology. Automobiles have made a significant contribution to the development of modern society in meeting people's daily mobility needs. However, the application of a large number of automobiles in the world has produced and is continuing to cause serious environmental and human survival problems. In the past ten years, in the field of research and development related to transportation, people have devoted themselves to the development of efficient, clean and safe means of transportation. Electric vehicles, hybrid vehicles, and fuel cell vehicles have been typically proposed as transportation means to replace conven...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a protection system and method for mis-shifting of electric vehicles, aiming at the defect that the fault protection measures of existing electric vehicles may cause severe vibration of the motor when there is a large torque output. Carry out specific torque output control in the gear state to ensure the smooth operation of the vehicle

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