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09-21 4891-01 4. SCHEMATIC DIAGRAM When equipped with ABS, the braking force at each wheel will be controlled with 3-channel 4-sensor method. And when equipped with ESP, 4 wheels will be controlled independently with 4-channel method. (When controlling ABS system only, it will be operated with 3-channel method.) When compared to the vehicle equipped with ABS/EBD only, the internal hydraulic circuit has a normally-open separation valve and a shuttle valve in primary circuit and in secondary circuit. When the vehicle brakes are not applied during engine running or when applying the non-ABS operating brakes, the normally- open separation valve and the inlet valve are open, whereas the normally-closed shuttle valve and the outlet valve are closed. When the ESP system is operating, the normally-open separation valve will be closed by the solenoid valve operation and the hydraulic circuit will be established by the shuttle valve. Then, the inlet and outlet valves will be closed or open depending on the braking pressure increase, decrease or unchanged conditions. ▶The warning lamp comes on and warning beep sounds when the ESP is operating Driving feeling when the ESP is operating ▶ ▶Noise and vibration that driver senses when the ESP is operating 1) Hydraulic Circuit Diagram When the ESP operates during vehicle movement, the ESP warning lamp on the instrument panel flickers and beep comes on every 0.1 second. The ESP operation shows that the vehicle stability is extremely unstable and it is used to warn the driver. The ESP system is just a supplementary system for the vehicle motion and it cannot control the vehicle when it exceeds the physical limits. Do not solely rely on the system but be advised to drive the vehicle safely. When the ESP system activates, the driving feeling can be different depending on vehicle driving conditions. For example, you will feel differently when the ESP system is activated during when ABS is operating with the brakes applied and when brakes are not applied on a curve. Thus, the ESP system would make the driver feel more abruptly when the brakes are applied during the ESP system activation. The ESP system may transfer noise and vibration to the driver due to the pressure changes caused by the motor and valve operations in a very short period of time. Extreme cornering will trigger the ESP operation and this will make the driver feel noise and vibration due to sudden brake application. Also, the ESP system controls the engine output. So, the driver may notice the engine output decrease even when the accelerator pedal is being applied. |