专业英语ABS.pptVIP

* * * Anti-lock Braking System 防抱死刹车系统 * * Four question Why? What? How? What? * * One、Why we need ABS？ wheels lockup under heavy breaking condition 1、driving stability is lost，and the vehicle skids 2、the vehicle cannot be steered 3、the breaking distance increase 4、the risk of an accident increase。 Lead to 1、行驶稳定性丧失，车轮打滑 2、车轮无法转向 3、制动距离增加 4、事故几率增加 * * Two、What is ABS？ “ABS”（Anti-lock Braking System）中文译为“防抱死刹车系统”。 一种具有防滑、防锁死等优点的汽车安全控制系统。既有普通制动系统的制动功能，又能防止车轮锁死，使汽车在制动状态下仍能转向，保证汽车的制动方向稳定性，防止产生(侧滑)和(跑偏) 。 Function: It is one kind has such advantages as slippery, antilock safety control system. It has both common braking system brake function, and can prevent the wheels lock, to make the car in the braking locked state can still turn to ensure the direction, braking stability, prevent to (sideslip) and (deviation) * * 1、The theory put forward anti-lock braking（1928） 2、The advent of mechanical ABS（1954） 3、The advent of electronic ABS（1968） ABS has been used on aircraft for years，and some car were offered with an early form of antilock braking in the late 1960s and 1970s。 1、制动防抱理论的提出 （1928） 2、机械式ABS的问世 （1954） 3、电子式ABS的问世 （1968） * * Consist of ABS 1、speed sensors 2、ECU 3、hydraulic actuator 1、车速传感器 2、电控单元 3、液压执行机构 * * Three、How ABS works? Speed sensors 车速传感器 Electronic control unit 电控装置 Speed signal 车速信号 Hydraulic actuator 制动器 Order 指令 Wheel 车 轮 Rotation rate 转速 braking force 制动力 * * The process of braking（制动过程） Under normal braking the ABS is not used，and the master cylinder reacts to brake-pedal movement to send fluid pressure out to each wheel cylinder。During full，ABS controlled braking。Pressure is automatically adjusted to prevent wheel lockup with constant brake-pedal force。The three process involved are as follows： 在常规制动时ABS是不工作的，总泵根据踏板压力作出反应对每个分泵输送油液。在刹车踩死时，ABS控制刹车。油液压力自动调整，以防止在连续踏板力不断作用下车轮锁死。这三个过程中涉及的如下： * * 1、Maintaining braking pressure.if a wheel speed sensor signal severe wheel decelerate to the electro