| 摘要 |
When a brake pedal is forced so that a switch of a brake lamp is on, the wheel sensor checks whether speed of a itself car is zero. When the checked braking period is longer than the set period, electric current is passed to a solenoid valve. The piston of the brake booster is moved and then stopped by the solenoid valve. The throttle position sensor senses the point of open of the throttle sensor so that the automatic control unit receives a signal from the throttle position sensor. And then the automatic control unit interrupts the current into the solenoid valve so that the braking power is released. The solenoid valve makes a plunger hooked up on the concave jaw of the piston rod in the brake booster. The compressed air is not flow from the compressor to the inlet/outlet pipe by the solenoid valve. Thereby a driver put the brake pedal for a given period so that the brake condition is kept automatically.
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