1　简　介目前 ,交通运输汽车的安全系统尚存在许多问题。首先 ,交通运输汽车采用的空气制动 ,由于汽车经常工作于不同温度的空气环境中 ,从空气泵输出的压力空气必须通过人工阀门等一系列比较繁杂的操作系统进行调控放水后 ,才能用于制动 ,一方面操作复杂 ,另一方面无法达到理 1 Introduction At present, there are still many problems with the safety system of transportation vehicles. First of all, the air brake used in transport vehicles, because the car often work in different temperature air environment, the pressure air output from the air pump must pass through a series of more complex operating system, such as artificial valves to regulate water discharge, can be used for Braking, on the one hand complex operation, on the other hand can not be achieved