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1前言气制动阀按随动机构的不同可分为活塞弹簧式、膜片弹簧式和活塞弹力橡胶式等，拖拉机挂车机组的气制动装置多采用单管路气制动型式，其中气制动阀主要采用活塞弹簧式和膜片弹簧式，是一种直动调压阀。动特性是指当向气制动阀输入阶跃信号（以尽快的速度使推杆行程由0至最?
1 Foreword Depending on the follow-up mechanism, the pneumatic brake valve can be divided into piston spring type, diaphragm spring type and piston elastic rubber type. The air brake device of the tractor trailer unit adopts the single-pipe air brake type, in which the gas Brake valve piston spring and diaphragm spring type, is a direct acting pressure regulating valve. Dynamic characteristics refers to the pneumatic brake valve input when the step signal (as quickly as the push rod stroke from 0 to the most?