ESC Operation Mode: Notes

The ESC analyzes the intention of the driver.

Fig 1: ESC Operation Mode - Step 1
Courtesy of HYUNDAI MOTOR CO.
It analyzes the movement of the ESC vehicle.

Fig 2: ESC Operation Mode - Step 2
Courtesy of HYUNDAI MOTOR CO.
It controls a vehicle posture control through the ESC braking power.
- The ECU calculates the needed countermeasure.
- The hydraulic unit controls independently the braking power of each wheel.
- The ESC adjusts engine output through an engine and communication line to be connected.

ESC Non-operation-Normal braking

ESC OPERATION MODE

	Inlet valve (EV)	Outlet valve (AV)	Pilot valve (USV)	High pressure switch valve (HSV)	Pump motor
Normal braking	Open	Close	Open	Close	OFF

Fig 3: ESC Operation Mode Circuit Diagram

Courtesy of HYUNDAI MOTOR CO.

ESC INCREASE MODE

	Inlet valve (EV)	Outlet valve (AV)	Pilot valve (USV)	High pressure switch valve (HSV)	Pump motor
Normal braking	Open	Close	Close (Partial)	Open	ON (Motor speed control)

Fig 4: ESC Increase Mode Circuit Diagram

Courtesy of HYUNDAI MOTOR CO.

ESC HOLD MODE (FR is only controlled.)

ESC HOLD MODE

	Inlet valve (EV)	Outlet valve (AV)	Pilot valve (USV)	High pressure switch valve (HSV)	Pump motor
Normal braking	Close	Close	Close (Partial)	Open	ON (Motor speed low control)

Fig 5: ESC Hold Mode Circuit Diagram

Courtesy of HYUNDAI MOTOR CO.

ESC DECREASE MODE (FR is only controlled)

ESC DECREASE MODE

	Inlet valve (EV)	Outlet valve (AV)	Pilot valve (USV)	High pressure switch valve (HSV)	Pump motor
Normal braking	Close	Open	Close (Partial)	Open	ON (Motor speed low control)

Fig 6: ESC Decrease Mode Circuit Diagram

Courtesy of HYUNDAI MOTOR CO.