基于磁流变液的线控制动仿真实验研究

Research on the Simulation Experiment of Brake-by-Wire Based on Magnetorheological Fluid

针对磁流变液制动器,提出了一种正弦调频励磁电流控制方式,建立了正弦电流频率与等效力矩的数学模型,通过改变电流控制器输出的正弦频率直接调整制动力矩,消除了传统的基于门限阈值控制方式带来的剩余磁滞问题。使用COMSOL软件对不同频率正弦励磁信号控制下的输出进行仿真,并进行剩余制动力矩模型修正。仿真结果表明,在电流频率由0.1 Hz变化到10 Hz时,等效力矩输出范围可达150 N·m,可满足多数汽车ABS对制动力矩范围的需求。

Aiming at the magnetorheological fluid brake,a sinusoidal frequency modulation excitation current control method is proposed,and the mathematical model of sinusoidal current frequency and equivalent torque is established.By changing the sinusoidal frequency output by the current controller,the braking torque is directly adjusted,eliminating the traditional Based on the residual hysteresis caused by the threshold control method.Use COMSOL software to simulate the output under the control of the sinusoidal excitation signal of different frequencies,and modify the residual braking torque model.The simulation results show that when the current frequency changes from 0.1 Hz to 10 Hz,the output range of equivalent torque can reach 150 N·m,which can meet the requirements of most automobile ABS for the range of braking torque.