王同建 　付德龙　张美荣　陈晋市　张飞　王一川

摘   要：为验证继动阀的可靠性（输出压力12.0 MPa，响应时间0.2 s），并研究继动阀动态特性对全液压制动系统制动性能的影响，以某型号越野车开发的全液压制动系统为研究对象，建立了继动阀理论分析模型，运用AMESim软件建立了全液压制动系统仿真模型，分析了阀芯摩擦力、节流口的初始遮盖量、复位弹簧初始压缩量和弹簧刚度对制动性能的影响，并通过实验验证了仿真模型的准确性. 研究结果表明：继动阀应用于液压制动系统可以满足制动要求（输出压力12.0 MPa，响应时间0.2 s）;阀芯摩擦力过大會使继动阀的开启压力增大，导致继动阀的比例滞环增大，影响阀芯的复位性能;继动阀节流口的初始遮盖量越大，打开节流口克服的摩擦力越大，制动系统的响应时间越长;通过调节继动阀复位弹簧初始压缩量和弹簧刚度可实现制动压力的微调节. 理论模型和仿真模型为全液压制动系统的进一步优化提供了可靠依据.

关键词：液压制动;继动阀;AMESim仿真;动态特性

中图分类号：TH137.5                           文献标志码：A

Study on Dynamic Characteristics of

Relay Valve in Hydraulic Brake System

WANG Tongjian1，FU Delong1，ZHANG Meirong3，CHEN Jinshi1，2，ZHANG Fei3，WANG Yichuan1

（1. School of Mechanical and Aerospace Engineeringr，Jilin University，Changchun 130025，China;

2. State Key Laboratory of Automotive Simulation and Control，Jilin University，Changchun 130025，China;

3. Inner Mongolia First Machinery Group Co.，Ltd，Baotou 014000，China）

Abstract：To test and verify the reliability of relay valve （with output pressure of 12.0 MPa and response time of 0.2 s）， and to study the influence of dynamic characteristics of the relay valve on braking performance of the full hydraulic braking system， taking a type off-road vehicles fully hydraulic braking system as the research object， a theoretical analysis model of the relay valve was established. A simulation model of the full hydraulic brake system was established by applying the software AMESim， and the influence of the spool friction， initial cover， return spring the initial amount of compression and spring stiffness on braking performance was analyzed. The accuracy of the simulation model was verified by experimental results. The comparison shows that the relay valve applied to the hydraulic braking system can meet the braking requirements（output pressure of 12.0 MPa and response time of 0.2s）. Excessive friction of the spool increases the opening pressure of the relay valve， which leads to the increase of proportional hysteresis of the relay valve and affects the reset performance of the spool. The greater the initial cover of the relay valve orifice is， the greater the friction to be overcome by opening the orifice becomes， and the longer the response time of the braking system is required. By adjusting the initial compression of the reset spring of the relay valve and the stiffness of the spring， the fine tuning of the brake pressure can be realized. The theoretical model and simulation model provide a reliable basis for further optimization of the full hydraulic braking system.

Key words：hydraulic brakes;relay valve;AMESim simulation;dynamic characteristics

全液压制动系统以液压油作为传动介质，与气压制动系统相比具有制动力矩大、响应时间短、性能稳定、系统结构简单、便于实现电子控制等优点[1]. 目前全液压制动系统主要应用于工程机械、农业机械、矿用车辆等大型车辆中，且有替代其他传统制动形式的趋势[2].

国内外学者对全液压制动系统的研究已经进行了较长一段……