| 摘要 |
An electrical mechanism for locking the foot brake of a motor vehicle, including a solenoid which causes the foot brake to be locked in position and an electrical relay system comprises of a circuit which, when completed, actuates the solenoid; the relay system circuit includes the vehicle ignition switch, a stop light switch which is closed when the foot brake is operated and the vehicle rear stop lights are lit; a first switch which is closed when the automatic locking mechanism has not been activated; three second switches in electric parallel, a first one that is associated with the gear shift lever and is closed when the gear shift lever is in Neutral gear, a second one that may be closed by the vehicle operator if he desires the foot brake to automatically lock, and a third inertia controlled safety switch that is closed only after the vehicle has come to a full stop when there has been a rapid deceleration of the vehicle. The foot brake locking mechanism release means comprises a solenoid, which, when activated, causes release of the foot brake locking mechanism and a second relay system circuit associated with this solenoid, which second circuit must be completed to activate the solenoid; the second circuit includes the vehicle ignition switch, a second switch which is closed only when the gear shift lever is in one of the driving gears, a third switch which is closed when the motor is operating, a fourth switch which is closed only when the foot brake is locked, a fifth switch which is closed just as the vehicle operator initiates movement of the vehicle, and in parallel with each other there are a vacuum switch connected with the vehicle motor induction manifold to be closed upon pressure reduction in this manifold and a gravity controlled switch means which is closed when the vehicle is on a level surface and is open when the vehicle is facing uphill or downhill. The parking brake locking mechanism release means also comprises a solenoid which, when actuated, releases the parking brake and a third relay system circuit, which must be completed to activate the solenoid. The third circuit includes switches functionally identical to the switches for the foot brake locking mechanism release means, but in place of the switch that senses that the foot brake is locked, there is a switch that senses that the parking brake is on.
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