| 摘要 |
<p>An anti-skid brake control system increases fluid pressure in the wheel cylinder in different two increasing rate. For instance, until the fluid pressure in the wheel cylinder reaches a predetermined level, the fluid pressure is increased at a first normal rate and thereafter in a second limited rate. In order to assume the fluid pressure in the wheel cylinder reaching at the predetermined level, a duration for holding the anti-skid control system at a position to increase the fluid pressure at the first rate will be determined based on a peak value of wheel acceleration. In order to detect the peak value of the wheel acceleration, the anti-skid brake control system includes a detector for detecting the peak value of wheel acceleration in each cycle of skid control. The duration of braking pressure increased is adjusted depending upon the detected peak value of the wheel acceleration. The duration for which the brake pressure increase operation continues corresponds to the period of time necessary for the pressure to increase to approximately a projected or assumed lock pressure. After this duration has expired, the braking pressure is increased at the second rate for a given period of time. Therefore, the braking pressure is maintained at approximately the lock pressure. By increasing braking pressure at limited second rate substantially smaller than the first rate for a fixed period of time, optimal braking characteristics can be achieved.</p> |
