汽车制动

2018-08-03 09:38:49
                

Chassis – Braking systems

Permanent brake

The integrated permanent brake system includes as standard a constant throttle engine brake as well as an exhaust brake. It reduces the work of the foot-brake and reduces wear on the brake linings.

This reduces the maintenance costs of the foot-brakes. The permanent brake system allows good control of the braking force, even making it possible to achieve high average speeds going downhill with a forward-thinking driving style.

On request, the permanent brake system can also be supplemented by a retarder.

Engine brake

Functional principle of the constant throttle:

A small, compressed-air activated auxiliary valve is located in each combustion chamber of the engine. It acts to decrease the pressure during the 2nd stroke (compression) and prevent the piston from being accelerated by the compressed air during the following 3rd stroke (power). This increases the engine braking effect.

Functional principle of the exhaust brake:

The exhaust brake is the second standard engine brake after the constant throttle. The braking force is increased by closing the exhaust flap. This produces back pressure, which brakes the motion of the piston during the 4th stroke (exhaust). At the same time, the fuel supply is cut off.

 

底盘 ——制动系统

缓速器

标准的集成缓速器系统包括恒定节流阀发动机制动以及排气制动。它减少了脚刹车的工作量,降低了刹车片的磨损程度。  

同时,还降低了脚刹车的维修成本。缓速器能够较好地控制制动力,在驾驶者在能够预测可能发生的情况下时,它可以实现提高下坡时的平均速度。

根据要求,缓速器亦可作为缓速器系统的补充部分。

发动机制动

恒定节流阀的功能原理:

恒定节流阀是一个小的压缩空气的活性辅助阀,位于发动机的各个燃烧室之中。其主要作用在于降低第二冲程(压缩)期间的压力,防止活塞在接下来的第三冲程(膨胀)期间由于空气压缩引起的加速。如此一来提升了发动机的制动效果。

排气制动的功能原理:

排气制动是仅次于恒定节流阀的第二标准发动机制动,通过关闭排气阀来提升制动力,产生背压,在第四冲程(排气)期间阻碍活塞上行,同时燃料供应被切断。


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