基于AMESim的ESC电磁高速开关阀仿真研究

Simulation of ESC solenoid high-speed on/off valve based on AMESim

在汽车电子稳定系统(ESC)中,一般采用控制高速开关阀实现制动轮缸的压力控制。分析了ESC液压系统的组成以及原理,对高速开关阀的物理结构进行分析并建立数学模型,基于该模型运用AMESim仿真平台建立了高速开关阀以及ESC液压系统的仿真模型。使用高频PWM技术对高速开关阀模型进行动态响应特性仿真,进而实现ESC对轮缸压力的控制,通过仿真深入分析了占空比对高速开关阀中电磁力、阀芯位移以及轮缸压力的影响。结果表明,构建的高速开关阀仿真模型可以实现ESC制动压力的主动增压、保压和减压3种控制,且通过控制PWM占空比实现轮缸压力的精确控制,最大压力与实验对比误差控制在5%范围内。

In the vehicle Electronic Stability Control System(ESC),the control of high-speed on/off valve is generally used to achieve pressure control of the brake wheel cylinders.The composition and principle of ESC hydraulic system was analyzed,the physical structure of the high-speed on/off valve was analyzed and its mathematical model was established.Based on this model,a simulation model of the high-speed on/off valve and ESC hydraulic system was established by the AMESim simulation platform.Simulation of dynamic response characteristics of high-speed on/off valve models using high-frequency PWM technology enabled ESC to control the wheel cylinder pressure.The effect of duty ratio on the electromagnetic force,spool displacement and wheel cylinder pressure in the high-speed on/off valve was analyzed in depth through simulation.The results showed that the high-speed on/off valve simulation model constructed could realize active building up,holding or reducing the ESC brake pressure.Precise control of wheel cylinder pressure was achieved by controlling the PWM duty ratio,and the error of maximum pressure compared with experiment was controlled within 5%.