ABS Control
Overview
The ABS control maintains vehicle stability by preventing wheel lock during hard braking or braking on a slippery road surface and helps the driver retain steering control.
Control
When wheel speed is significantly reduced from estimated vehicle speed, the VSA modulator-control unit closes the inlet valve and opens the outlet valve momentarily to reduce brake fluid pressure and the pump motor starts running. As wheel speed increases, the VSA modulator-control unit maintains brake fluid pressure by keeping the inlet valve closed. Brake fluid pressure is increased when wheel speed matches the estimated speed of the vehicle. The VSA modulator-control unit repeats this valve control operation to control the ABS function.