초록 ▼

In an anti-skid brake control system, wheel acceleration or deceleration is calculated at a different timing than the calculation of the wheel speed and a control signal. The intervals between calculations of wheel acceleration and deceleration will often be longer than those of the control signal.

In an anti-skid brake control system, wheel acceleration or deceleration is calculated at a different timing than the calculation of the wheel speed and a control signal. The intervals between calculations of wheel acceleration and deceleration will often be longer than those of the control signal. Wheel acceleration and deceleration values in the intervals between calculations are extrapolated on the basis of the rate of change derived from the difference between two successively derived wheel acceleration and deceleration values and elapsed time since the last derivation. The extrapolating value is used as a replacement for the most recently derived wheel acceleration in deriving the control signal.

대표청구항 ▼

An anti-skid brake control system for an automotive hydraulic brake system comprising: a hydraulic brake circuit including a wheel cylinder for applying braking pressure to a vehicle wheel and a pressure control valve disposed within said brake circuit for controlling hydraulic pressure to be applie

An anti-skid brake control system for an automotive hydraulic brake system comprising: a hydraulic brake circuit including a wheel cylinder for applying braking pressure to a vehicle wheel and a pressure control valve disposed within said brake circuit for controlling hydraulic pressure to be applied to said wheel cylinder for adjusting braking pressure, said pressure control valve being operative to increase hydraulic pressure to be applied to the wheel cylinder in a first position thereof, and to decrease the hydraulic pressure in a second position thereof; a wheel speed sensor for outputting sensor signal pulses separated by intervals, said intervals representative of detected wheel rotation speed; a timer for outputting timer signals; a first means for sampling values of the timer signals in response to input of said sensor signal pulses; a second means, operative at a predetermined timing, for deriving wheel speed on the basis of sampled timer signal values; a third means for deriving wheel acceleration or deceleration based on three sampled timer signal values of which the difference between the timed intervals between each pair of timer signal values is greater than a predetermined value; a fourth means for deriving a control signal for controlling said pressure control valve on the basis of wheel speed and wheel acceleration or deceleration derived by said second and third means, so that wheel speed is held at an optimal relationship to vehicle speed; and fifth means for deriving the rate of change of wheel acceleration or deceleration on the basis of the two most recently derived values of wheel acceleration or deceleration from said third means, and deriving extrapolating value of wheel acceleration or deceleration based on said derived rate of change, and, said fifth means feeding said extrapolating value to said fourth means as a replacement of said wheel acceleration or deceleration from said third means during the time interval between successive wheel acceleration or deceleration calculations in said third means.