电涡流缓速器制动力矩的实时控制

为了使装有电涡流缓速器的车辆在下坡时能以稳定的速度行驶,以电涡流缓速器的制动力矩和励磁电流的关系为依据,应用脉宽调制(PWM)技术实现电涡流缓速器制动力矩的无级调节.分析了车辆下坡运行的工况,以车辆的速度和瞬时加速度产生的惯性力作为电涡流缓速器制动力矩的控制依据,提出了电涡流缓速器制动力的无级控制策略,并绘制了控制流程.利用实车的不同初始运行工况进行模拟,计算结果表明,对车辆电涡流缓速器制动力矩的实时控制能使车辆在坡道上以稳定的目标速度行驶.

Real-time control of braking torque of eddy-current retarder

Based on the relationship between the braking torque of eddy-current retarder and its excitation current,the PWM technology was applied to realize the stepless modulation of the braking force of eddy-current retarder in order to make a vehicle to run downhill at constant speed.The running conditions of the downhill vehicle were analyzed.With the vehicle speed and inertia force caused by the instantaneous acceleration as the control target of the eddy-current retarder braking torque,the control tactic of the eddy-current retarder braking torque was proposed,and the control process was described.The calculation results of the different original running conditions of an actual vehicle show that the vehicle can run down the slope at the steady targeting speed with the real-time control of braking torque of eddy-current retarder.