ESC Operation Mode: Notes

STEP 1
The ESC analyzes the intention of the driver.

Fig 1: ESC Analyzes For Intention Driver
Courtesy of HYUNDAI MOTOR CO.
STEP 2
It analyzes the movement of the ESC vehicle.

Fig 2: ESC Analyzes For Movement ESC Vehicle
Courtesy of HYUNDAI MOTOR CO.
STEP 3
he HECU calculates the required strategy, then actuates the appropriate valves and sends torque control requests via CAN to maintain vehicle stability.

ESC Non-operation-Normal braking.

INLET AND OUTLET VALVE POSITION

	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 Non-Operation-Normal Braking - Circuit Diagram

Courtesy of HYUNDAI MOTOR CO.

NOTE: EV: Inlet Valve
AV: Outlet Valve
LR: Rear left wheel
RF: Front right wheel
LF: Front left wheel
RR: Rear right wheel
PE: Pump motor
USV: Pilot Valve
HSV: High pressure Switch Valve

ESC INCREASE MODE

INLET AND OUTLET VALVE POSITION

	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.

NOTE: EV: Inlet Valve
AV: Outlet Valve
LR: Rear left wheel
RF: Front right wheel
LF: Front left wheel
RR: Rear right wheel
PE: Pump motor
USV: Pilot Valve
HSV: High pressure Switch Valve

ESC HOLD MODE (FR is only controlled.)

INLET AND OUTLET VALVE POSITION

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

Fig 5: ESC Hold Mode - Circuit Diagram

Courtesy of HYUNDAI MOTOR CO.

NOTE: EV: Inlet Valve
AV: Outlet Valve
LR: Rear left wheel
RF: Front right wheel
LF: Front left wheel
RR: Rear right wheel
PE: Pump motor
USV: Pilot Valve
HSV: High pressure Switch Valve

ESC DECREASE MODE (FR is only controlled)

INLET AND OUTLET VALVE POSITION

	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.

NOTE: EV: Inlet Valve
AV: Outlet Valve
LR: Rear left wheel
RF: Front right wheel
LF: Front left wheel
RR: Rear right wheel
PE: Pump motor
USV: Pilot Valve
HSV: High pressure Switch Valve

Fig 7: Identifying ABS Warning Lamp

Courtesy of HYUNDAI MOTOR CO.