초록 ▼

An anti-skid brake control system controls the operation mode of a pressure control valve in a hydraulic brake circuit for increasing the fluid pressure in its application mode, for decreasing the fluid pressure in its releasing mode and for holding the fluid pressure at a constant value in its hold

An anti-skid brake control system controls the operation mode of a pressure control valve in a hydraulic brake circuit for increasing the fluid pressure in its application mode, for decreasing the fluid pressure in its releasing mode and for holding the fluid pressure at a constant value in its holding mode. The control system has a predetermined operation pattern in which the operation modes of the pressure control valve cycle through a predetermined schedule. Measured wheel acceleration and slip rate values dictate which operation modes are to be selected next and when the change from mode to mode should be performed. When the operation mode is to be changed, the next operation mode selected is checked to see if it is consistent with that scheduled. When the selected operation mode is different from the scheduled one, the selected operation mode is modified to perform the operation according to the scheduled operation mode which would otherwise be skipped.

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 force to a vehicle wheel; a pressure control valve disposed within said hydraulic circuit and operative to increase fluid pressure in said

An anti-skid brake control system for an automotive hydraulic brake system comprising: a hydraulic brake circuit including a wheel cylinder for applying braking force to a vehicle wheel; a pressure control valve disposed within said hydraulic circuit and operative to increase fluid pressure in said wheel cylinder in a first position thereof, to decrease the fluid pressure in said wheel cylinder in a second position thereof and to hold the fluid pressure in said wheel cylinder constant in a third position thereof; a wheel speed sensor means for detecting the rotational speed of said vehicle wheel and producing sensor signal pulses separated by intervals, said intervals representative of detected wheel speed; a first means for detecting wheel acceleration and producing a first signal indicative of the detected wheel acceleration; a second means for detecting the slip rate of the vehicle wheel with respect to the ground and producing a second signal indicative of the detected slip rate; a third means for producing a control signal which actuates said pressure control valve in a predetermined sequence of positions of said first, second and third positions so as to adjust the wheel rotational speed toward an optimal relationship with vehicle speed, said third means generating said control signal based on a predetermined relationship between values of said first and second signals; and a fourth means, associated with said third means and responsive to said control signal for determining an intended sequence of operations of said pressure control valve in said first, second and third positions and for modifying said control signal when said control signal would otherwise control said pressure control valve to operate outside said predetermined sequence of positions to assure that said pressure control valve always operates in said predetermined sequence of positions.