According to a vacuum failure auxiliary brake control system for an electric vehicle, the vacuum degree pressure value and the vacuum degree pressure value decreasing rate of a vacuum degree sensor are monitored in real time through a central controller, the fault level is judged according to the vacuum degree pressure value and the vacuum degree pressure value decreasing rate, and under the condition that a brake lamp switch is not triggered, in a certain data acquisition period, if the vacuum degree pressure value decline rate is greater than a set value 1, judging that the fault is a vacuum system air leakage first-level fault; in a certain data acquisition period, if the vacuum degree pressure value decline rate is greater than a set value 2, judging that the fault is a vacuum system air leakage secondary fault; and when the vacuum degree pressure value is smaller than the set value 4, the central controller judges that the vacuum system leakage three-level fault occurs, the central controller enters the state of preparing to start the vacuum failure auxiliary braking function, and meanwhile, a braking system fault lamp is turned on, a sound alarm is generated, and a fault code is recorded. According to the system, under the condition that the vacuum booster system fails, through logic setting of the central controller, the ESC and the motor driving system are cooperated to carry out braking and quit braking according to the intention of a driver, so that the driving safety is ensured.
一种电动汽车真空失效辅助制动控制系统,通过中央控制器实时监控真空度传感器的真空度压力值和真空度压力值下降率,根据真空度压力值和真空度压力值下降率来判断故障等级,在制动灯开关没有触发的情况下,在一定数据采集周期内,真空度压力值下降率>设定值1,判断为真空系统漏气一级故障;在一定数据采集周期内,真空度压力值下降率>设定值2,判断为真空系统漏气二级故障;真空度压力值<设定值4,中央控制器判断为真空系统漏气三级故障,中央控制器进入准备启动真空失效辅助制动功能状态,同时点亮制动系统故障灯,发出声音报警和记录故障码。采用本发明能使真空助力系统失效的情况下,通过中央控制器的逻辑设定,协同ESC、电机驱动系统根据驾驶员的意图进行制动和退出制动,保证驾驶安全性。
Vacuum failure auxiliary brake control system for electric vehicle
一种电动汽车真空失效辅助制动控制系统
2021-08-10
Patent
Electronic Resource
Chinese
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