| 摘要 |
PURPOSE:To secure sufficient braking force during car stoppage as well as to aim at improvements in operatability, by keeping up a state of power feeding to an electric controlling valve automatically even in time of releasing the holding operation of a brake operating device 2 during stoppage, while releasing the power feeding in time of starting. CONSTITUTION:A contactless keep switch device 3 is constituted of fixed resistors R1, R2 and an RS flip-flop. A buffer 34 as a power amplifier circuit and a transistor 35 as a driving element are connected to the midway between an output point Q of the RS flip-flop and a coil 33. Each of normally opened type switches S1-S3 are connected in series to a grounding wire at the side of a set input point S of the fixed resistor R1. The switch S1 is one that is closed as interlocked with a driving key switch 34, therefore it comes to a closed circuit only in time of driving. The switch S2 comes to a closed circuit with a stop signal out of a car speed detector 4, while the switch S3 is closed with braking operation of a brake pedal. |
