The invention discloses an electro-hydraulic composite brake control method and system for an electric automobile. According to the control method, the brake strength is compared with the hydraulic intervention triggering strength; when the brake strength is greater than or equal to the hydraulic intervention triggering strength, the brake is released; a liquid inlet valve of the EHB wheel cylinder is controlled to be opened; a gap between the friction plate and the brake disc is eliminated; a gap between the brake disc and the friction plate is eliminated in advance; the influence of the delay link of the p-V characteristic on the pressure reduction process of the brake wheel cylinder is eliminated; the impact of the vehicle under the hydraulic braking intervention transition working condition when the motor braking force is saturated is reduced; when the rotating speed of the motor is less than the minimum rotating speed value of the motor or the power of the power battery is less than the power threshold, a corrected PID control algorithm is adopted to carry out motor brake compensation control on a motor of the electric automobile, so that total brake force fluctuation caused by motor brake and hydraulic brake time domain response difference is reduced, the impact degree occurring under the motor brake withdrawal transition working condition at a low speed is reduced, and the driving smoothness is improved.
本发明公开了一种电动汽车的电液复合制动控制方法及系统。本发明的控制方法通过比较所述制动强度与所述液压介入触发强度的大小,当所述制动强度大于或等于所述液压介入触发强度时,控制EHB轮缸的进液阀开启,消除摩擦片与制动盘间隙,以提前消除制动盘与摩擦片间隙,消除p‑V特性的延迟环节对制动轮缸减压过程的影响,减小车辆在电机制动力饱和时液压制动介入过渡工况下出现的冲击,当电机的转速小于电机最小转速值或动力电池的电量小于电量阈值,采用修正的PID控制算法对电动汽车的电机进行电机制动补偿控制,以减小电机制动和液压制动时域响应差导致产生总制动力波动,减小低速时电机制动撤出过渡工况下出现的冲击度,提高驾驶平顺性。
Electro-hydraulic composite brake control method and system for electric automobile
一种电动汽车的电液复合制动控制方法及系统
2020-08-07
Patent
Electronic Resource
Chinese
IPC: | B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen |
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