现代汽车的功率越来越大,车速越来越高,车辆内部的摩擦损失越来越小,这就意味着车辆自身的减速能力降低;同时,由于车辆总质量的增加,尤其是重卡,仅仅依靠汽车自身的主制动系统已经不能满足车辆高速重载条件下的制动需求。为了保证其安全性能,必须增加辅助制动器,世界上许多国家(如德国、法国和瑞士等)的交通法规已将辅助制动装置作为商用车的必备系统。目前,用于汽车上比较成熟的辅助制动装置就是缓速器。其中,发动机辅助制动系统在重卡市场得到日益广泛的重视。另外,国内一些客车生产厂家也开始研究这一系统在客车产品上的应用。尤其是 Hyundai’s power is getting bigger and bigger, the speed is getting higher and higher, and the friction loss inside the vehicle is getting smaller and smaller, which means the vehicle’s own deceleration ability is reduced. At the same time, due to the increase of the total vehicle mass, especially heavy truck, Rely on the car’s own main braking system has been unable to meet the vehicle under high-speed heavy load braking requirements. In order to ensure its safety performance, auxiliary brakes must be added. Traffic regulations in many countries around the world (such as Germany, France and Switzerland) have adopted auxiliary brake devices as essential systems for commercial vehicles. At present, the more mature auxiliary brake device used in cars is the retarder. Among them, the engine auxiliary braking system in the heavy truck market has been increasingly widespread attention. In addition, some domestic bus manufacturers have begun to study the application of this system in passenger vehicles. especially