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.
本发明公开了一种电动汽车低速防碰撞方法及系统,该方法包括:当防碰撞控制器判断到车速在第一预设车速范围内,且档位处于D档、车辆与障碍物距离大于第一距离阈值时,防碰撞控制器控制低速防碰撞功能由待机状态转至工作状态;当车辆满足低速防碰撞制动条件时,防碰撞控制器控制低速防碰撞功能进入制动状态,低速防碰撞制动条件为车速大于车速阈值、时距不大于时距阈值,在制动状态中,防碰撞控制器根据当前车速、车辆与障碍物的时距计算出所需制动力矩,并发送目标扭矩请求信号至电机控制器,以控制电机反拖进行车辆制动。本发明能够解决现有技术安全距离精度低、制动响应时间长的问题。
Electric vehicle low-speed anti-collision method and system
电动汽车低速防碰撞方法及系统
2020-07-24
Patent
Electronic Resource
Chinese
IPC: | B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / B60Q ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL , Anordnung von Signal- oder Beleuchtungsvorrichtungen, deren Einbau oder Halterung oder deren Schaltkreise bei Fahrzeugen allgemein / B60T Bremsanlagen für Fahrzeuge oder Teile davon , VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF |
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