System Operation

SYSTEM COMPONENT





The Anti-Lock Brake System (ABS) controls the hydraulic brake pressure of all four wheels during sudden braking and 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 traction control is a variable system designed to enhance traction during acceleration and cornering. It does so by determining the optimum amount of wheel spin for any given driving situation, and then suppressing surplus engine power accordingly.
The hydraulic electronic control unit (HECU) receives signals concerning 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. Because the system is variable, the control unit may determine, depending on the driving conditions, that some wheel spin is beneficial (thus enhancing straight-line acceleration), or that no wheel spin is beneficial (thus enhancing cornering). For any given driving situation, the control unit will determine the amount of wheel spin best suited to the driver's needs. The system is automatically read whenever the engine is started, but can be manually canceled with the TCS switch.
However, once actuated, the system cannot be canceled until it is once again in the ready state.

EBD (ELECTRONIC BRAKE-FORCE DISTRIBUTION)
EBD is additionally applied, instead of the proportioning valve, to deliver ideal distribution of fluid pressure to the front and rear brakes. This prevents the brakes from skidding in the event of rear wheel lock up and provides higher brake efficiency within the range of brake application.

ADVANTAGES
^ Functional improvement of base-brake system
^ Compensation of different friction coefficients
^ Elimination of proportioning valve
^ Failure recognition by warning lamp





COMPARISON BETWEEN PROPORTIONING VALVE AND EBD