초록 ▼

An anti-skid brake control system includes a plurality of controllers adapted to control the braking pressure on corresponding vehicle wheels. Each controller receives wheel speed sensor signals from a corresponding wheel speed sensor and derives the rotation speed of the corresponding wheel or whee

An anti-skid brake control system includes a plurality of controllers adapted to control the braking pressure on corresponding vehicle wheels. Each controller receives wheel speed sensor signals from a corresponding wheel speed sensor and derives the rotation speed of the corresponding wheel or wheels. The controller detects failure of the wheel speed sensor to perform a back-up operation in order to continue braking control. The controllers are mutually independent with regard to anti-skid brake control and, on the other hand, are mutually cooperative with regard to the back-up operation when one of the wheel speed sensors fails. The back-up operation includes switching the operation mode of the vehicle brake system from controlled mode to manual mode. Switching of operation mode from the controlled mode to manual mode is performed in each controller at a predetermined timing.

대표청구항 ▼

An anti-skid brake control system for an automotive vehicle comprising: a hydraulic brake system including wheel cylinders, one wheel cylinder associated with each of a driven and undriven vehicle wheels, first and second pressure control valves, each associated with one of the wheel cylinders assoc

An anti-skid brake control system for an automotive vehicle comprising: a hydraulic brake system including wheel cylinders, one wheel cylinder associated with each of a driven and undriven vehicle wheels, first and second pressure control valves, each associated with one of the wheel cylinders associated with first and second undriven wheels, and a third pressure control valve associated with the wheel cylinders associated with said driven wheels, each of said first, second and third pressure control valves being operative to increase the fluid pressure in the corresponding wheel cylinder in a first position, to decrease the fluid pressure in said corresponding wheel cylinder in a second position and to hold the fluid pressure in said corresponding wheel cylinder constant in a third position; a first wheel speed sensor producing first sensor signal pulses representative of the rotation speed of said first undriven wheel; a second wheel speed sensor producing second sensor pulses representative of the rotation speed of said second undriven wheel; a third wheel speed sensor producing third sensor signal pulses representative of the average rotation speed of said driven wheels; a first controller associated with said first pressure control valve for controlling the latter, said first controller being responsive to said first sensor signal pulses to record an input timing of said first sensor signal pulses, to derive brake control variables including wheel speed and wheel acceleration for anti-skid brake control of said one of the undriven wheels, and to produce a first control signal which actuates said first pressure control valve to one of said first, second and third positions so as to adjust the rotation speed of said first undriven wheel toward an optimal relationship with the vehicle speed; a second controller associated with said second pressure control valve for controlling the latter, said second controller being responsive to said second sensor signal pulses to record an input timing of said second sensor signal pulses, to derive brake control variables including wheel speed and wheel acceleration for anti-skid brake control of said the other undriven wheel, and to produce a second pressure control signal which actuates said second pressure control valve to one of said first, second and third positions so as to adjust the rotation speed of said second undriven wheel toward said optimal relationship to the vehicle speed; a third controller associated with said third pressure control valve for controlling the latter, said third controller being responsive to said third sensor signal pulses to record an input timing of said third sensor signal pulses, to derive brake control variables including wheel speed and wheel acceleration for anti-skid brake control of said driven wheels, and to produce a third control signal which actuates said third pressure control valve to one of said first, second and third positions so as to adjust the rotational speed of said driven wheels toward said optimal relationship to the vehicle speed; and means, associated with said first, second and third controllers and responsive to failure of any one of said wheel speed sensors for performing a back-up operation in which the controller corresponding to the failing wheel speed sensor is operated for disabling anti-skid control and allow manual braking control immediately upon failure of the failing wheel speed sensor, and the other controllers are operated for disabling anti-skid control and allow manual braking control when said other controllers complete a current cycle of anti-skid control.