| 摘要 |
PROBLEM TO BE SOLVED: To have generation of any trouble in a brake control, operational system prevented as well as keeping smooth deceleration without any excessively large control chamber inside pressure of a servo-unit even though any erroneous operation of trouble takes place in a braking device such as a negative pressure switching valve, an atmospheric pressure switching valve, and in the braking device of these control operational system and a servo-unit, etc. SOLUTION: This deceleration adding device is formed in such constitution as including the first control valve 15 for supplying the first pressure to the first and second pressure chambers 12, 11 in non-operation period, and the second control valve 16 for supplying the second pressure to the second pressure chamber in operation period so as to move the booster piston 14 of a servo-unit 100 in a vehicle braking direction. In this case, a control device for adding deceleration to a vehicle by operating the second control valve 16 when it is judged that the accelerator pedal is in its returning state on the basis of the output from the accelerator pedal operational state detecting means for detecting the operational state of the accelerator pedal, and a limiter 30 for shutting off the supply of the second pressure to the second pressure chamber when the pressure in the second pressure chamber reaches the set pressure are provided. |
