| 摘要 |
An adaptive braking system for an automotive vehicle is disclosed which includes a duty-cycle generator that generates a control signal for actuating a solenoid valve which controls braking pressure in the vehicle's brake actuators. The duty-cycle generator produces a pulsed output which actuates the solenoid valve; the width of the pulses being modulated so that rather precise control of the braking pressure is attained. The width of the pulses is determined by input signals representing wheel acceleration, wheel slip, and an error term. The adaptive braking cycle is initiated whenever wheel acceleration drops below a predetermined low deceleration level, or when wheel deceleration is maintained in a band between two deceleration levels for a sufficient time period. On the other hand, adaptive control of the vehicle's brakes is terminated whenever uninhibited fluid communication to the brake actuators is required or when wheel speed drops below a predetermined low reference guide. |
