| 摘要 |
PURPOSE:To prevent excess pressure from being given to an antiskid device, by comparing each time long between a braking point and a decompressing point as well as between a re-pressurizing point and its successive decompressing point with each setting value, and variable controlling a servo ratio of a braking hydraulic pressure servo unit. CONSTITUTION:When each time long between a braking point of braking operation and a decompressing point as well as between a re-pressurizing point and its successive de-compressing point is shorter than each setting value, it is so judged that a servo ratio is excessive, whereby a solenoid-operated selector valve 13 is selected to the momentary atmosphere release side, and differential pressure between negative pressure inside a braking hydraulic pressure servo unit 2 and atmospheric pressure is reduced. And, when it is longer than the setting value or the decompressing point is not produced, the negative pressure inside the braking hydraulic pressure servo unit 2 is constituted so as to be held to the specified value without selecting the solenoid- operated selector valve 13 to a servo medium source 12. Therefore, at the time of antiskid operation, excess pressure by the braking hydraulic pressure servo unit 2 can be prevented from being given to the antiskid device. |
