汽車制動系統(tǒng)外文翻譯(編輯修改稿)
2024-09-19 06:59 本頁面
【文章內容簡介】 the pull back springs retract the shoes, The fluid is forced back to the master cylinder and braking ceases.The primary purpose of the parking brake is to hold the vehicle stationary while it is unattended. The parking brake is mechanically operated by the driver when a separate parking braking hand lever is set. The hand brake is normally used when the car has already stopped. A lever is pulled and the rear brakes are approached and located in the “on”position. The car may now be left without fear of its rolling away. When the driver wants to move the car again ,he must press a button before the lever can be released. The hand brake must also be to stop the car in the event of the foot brake failing. For this reason, it is separate from the foot brake uses cable or rods instead of the hydraulic system.Antilock Brake SystemAntilock brake system make braking safer and more convenient, Antilock brake system modulate brake system hydraulic pressure to prevent the brakes from locking and the tires from kidding on slippery pavement or during a panic stop.Antilock brake system have been used on aircraft for years, and some domestic car were offered with an early form of antilock braking in late 1990’s. Recently, several automakers have introduced more sophisticated antilock system. Investigation in Europe, where antilock braking systems have been available for a decade, have led one manufacture to state that the number of traffic accidents could be reduced by seven and a half percent if all cars had antilock brakes. So some sources predict that all cars will offer antilock brakes to improve the safety of the car.Antilock system modulate brake application force several times per second to hold the tires at a controlled amount of slip。 all system acplish this in basically the same way. One or more speed sensors generate alternating current signal whose frequency increases with the wheel rotational speed. An electronic control unit continuously monitors these signals and if the frequency of a signal drops too rapidly indicating that a wheel is about to lock, the control unit instructs a modulating device to reduce hydraulic pressure to the brake at the affected wheel. When sensor signals indicate the wheel is again rotating normally, the control unit allows increased hydraulic pressure to the brake. This releaseapply cycle occurs several time per second to “pump”the brakes like a driver might but at a much faster rate.In addition to their basic operation, antilock system have two other things in mon. First, they do not operate until the brakes are applied with enough force to lock or nearly lock a wheel. At or other times, the system stands ready to function but does not interfere with normal braking. Second, if the antilock system fail in any way, the brakes continue to operate without antilock capability. A warning light on the instrument panel alerts the driver when a problem exists in t
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