#
ABS CONTROL OUTLINE

id041300184200
• ABS control occurs when wheel slip is determined by the ABS CM (based on the four ABS wheel-speed sensors). Then, the ABS HU pressure-retention and pressure-reduction solenoid valves are operated and brake fluid pressure is controlled accordingly to prevent wheel lock-up.
• Use of ABS control during emergency braking or on slippery road surfaces allows directional stability to be maintained, steerability ensured and stopping distance to be reduced.
• The ABS control system has independent front wheel control and unified control (select low) for the rear wheels.

  Note

  • Select low control: A control system in which the left and right vehicle wheel speeds are compared and brake fluid pressure is controlled according to the wheel most likely to lock-up.

Block Diagram

.

1 | ABS wheel-speed sensor (LF)
2 | ABS wheel-speed sensor (RF)
3 | ABS wheel-speed sensor (LR)
4 | ABS wheel-speed sensor (RR)
5 | Solenoid valve
6 | Pump motor
7 | Caliper piston (LF)
8 | Caliper piston (RF)
9 | Caliper piston (LR)
10 | Caliper piston (RR)