Description of On-Board Diagnostics
SYSTEM COMPONENTABS System Components:
The Anti-Lock Brake System (ABS) controls the hydraulic brake pressure of all four wheels during braking on hazardous road surfaces, preventing the wheels from locking up. ABS provides the following benefits.
1. Enables steering around obstacles with a greater degree of certainty, even during emergency braking.
2. Enables stopping during emergency braking while keeping stability and steerability even on curves.
If a malfunction occurs, a diagnosis function and fail-safe system are included for serviceability.
The Hydraulic and Electronic Control Unit (HECU) receives signals about the vehicle's speed, direction and road conditions from sensors at the wheels.
Based on these signals, the control unit will determine the optimum amount of wheel spin.
EBD (ELECTRONIC BRAKE-FORCE DISTRIBUTION)
EBD, instead of the proportioning valve, delivers ideal distribution of hydraulic pressure to the front and rear brakes. This prevents rear wheel lock up and provides higher brake efficiency within the range of brake application.
ADVANTAGES
- Functional improvement of the basic-brake system
- Compensation for different friction coefficients
- Elimination of the proportioning valve
- Failure notification by warning lamp
COMPARISON BETWEEN PROPORTIONING VALVE AND EBD