Traction Control System (TCS)

TRACTION CONTROL SYSTEM (TCS)

1. NORMAL MODE





^ In the normal driving condition, TC valve (normally open) is the passage between the master cylinder and the each wheel cylinder.
^ When brake pedal is applied, brake pressure is delivered to the wheel cylinders via NO-TC valve and all solenoid valves inside the hydraulic unit are deactivated.
^ In case of TCS malfunction it does not affect brake operation.

2. PRESSURE INCREASE MODE





^ If a front wheel spin is detected, TCS begins a brake control to decrease a wheel spin.
^ Hydraulic shuttle valve (HSV) is opened. Brake fluid is supplied from the master cylinder by motor operation to the spin wheel via HSV.
^ TC valve is closed (ON). Brake pressure generated from motor pump is delivered only to the front wheel.
^ Inlet valve remains open to deliver the brake pressure generated from motor pump to the spinning wheels.

3. PRESSURE DUMP MODE





^ When the wheel deceleration is under the threshold and the wheel spin is reduced under a slip threshold, applied brake pressure is reduced to get a optimum traction force.
^ Outlet valve is open to release the brake pressure and inlet valve is closed to block the pressure increase from the motor pump.
^ Hydraulic shuttle valve (HSV) remains opened, TC valve is ON.
^ Motor is ON, to dump the brake fluid being released from the lock-up wheel.





4. PRESSURE HOLD MODE