Electric vehicle low-speed anti-collision method and system

Abstract

The invention discloses an electric vehicle low-speed anti-collision method and system. The method comprises the following steps: an anti-collision controller controls a low-speed anti-collision function to be switched from a standby state to a working state when the anti-collision controller judges that the vehicle speed is in a first preset vehicle speed range and the gear is in a D gear and thedistance between a vehicle and an obstacle is greater than a first distance threshold; when the vehicle meets a low-speed anti-collision braking condition, the anti-collision controller controls thelow-speed anti-collision function to enter a braking state, wherein the low-speed anti-collision braking condition is that the vehicle speed is larger than a vehicle speed threshold and the time interval is not larger than a time interval threshold; and in the braking state, the anti-collision controller calculates the required braking torque according to the current vehicle speed and the time interval between the vehicle and the obstacle and sends a target torque request signal to the motor controller so as to control a motor to drag reversely to brake the vehicle. The problems that in the prior art, the safety distance precision is low, and the braking response time is long can be solved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a low-speed anti-collision method and system for electric vehicles. Background technique [0002] With the rapid development of the automobile industry and the continuous improvement of people's living conditions, automobiles have become one of the indispensable means of transportation for people to travel. Car ownership is increasing year by year, and more and more people own private cars. Electric vehicles are the current development direction of the automotive industry. [0003] And along with the popularization rate of automobile increases substantially, urban traffic jam situation also increases the weight of day by day, drives a vehicle in the congested city road, and the traffic accident of rear-end vehicle rear-end occurs frequently. Therefore, in order to ensure the driving safety of the vehicle and improve the safety performance of the vehicle, the active anti-col...

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Problems solved by technology

[0005] For this reason, an object of the present invention is to propose a low-speed anti-collision method for electric vehicles to solve the problems of low safety distance accuracy and long braking response time in the prior art

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