Hyundai Genesis: ESC(Electronic Stability Control) System / Description and Operation

Description of ESC
ESC recognizes critical driving conditions, such as panic reactions in dangerous situations, and stabilizes the vehicle by braking by wheel and engine control intervention.
ESC adds a further function known as Active Yaw Control (AYC) to the ABS, TCS, EBD and ESC functions. While the ABS/TCS function controls wheel slip during braking and acceleration and, thus, mainly intervenes in the longitudinal dynamics of the vehicle, the active yaw control stabilizes the vehicle in its vertical axis.
The stability is achieved by brake intervention by wheel and adaptation of the momentary engine torque with no need for any action to be taken by the driver.
ESC essentially consists of three assemblies : the sensors, the electronic control unit and the actuators.
The stability control feature works under all driving and operating conditions. Under certain driving conditions, the ABS/TCS function can be activated simultaneously with the ESC function in response to a command by the driver.
In the event of a failure of the stability control function, the basic safety function, ABS, is still maintained.

Description of ESC Control
ESC system includes ABS/EBD, TCS and AYC function.
ABS/EBD function : The ECU changes the active sensor signal (current shift) coming from the four wheel sensors to the square wave. By using the input of the signals above, the ECU calculates the vehicle speed and the acceleration & deceleration of the four wheels. And, the ECU judges whether the ABS/EBD should be actuated or not.
TCS function preventsthe wheel slip in the driving direction by adding the brake pressure and reducing the engine torque via CAN communication. TCS function uses the wheel speed sensor signal to determine the wheel slip as far as ABS function.
AYC function prevents unstable maneuver of the vehicle. To determine the vehicle maneuver, AYC function uses the maneuver sensor signals(Yaw Rate Sensor, Lateral Acceleration Sensor, Steering Wheel Angle Sensor).
If vehicle maneuver is unstable (Over Steer or Under Steer), AYC function applies the brake pressure on certain wheel, and send engine torque reduction signal by CAN.
After the key-on, the ECU continually diagnoses the system failure. (self-diagnosis)If the system failure is detected, the ECU informs driver of the system failure through the BRAKE/ABS/ESC warning lamp. (fail-safe warning)

Input and Output Diagram

ESC Operation Mode
ESC Hydraulic System Diagram

1.
ESC Non-operation : Normal braking.
Solenoid valve
Continuity
Valve
Motor pump
TC Valve
IN (NO)
OFF
OPEN
OFF
OFF
OUT (NC)
OFF
CLOSE

2.
ESC operation
Solenoid valve
Continuity
Valve
Motor pump
TC Valve
Understeering
(Only inside of rear wheel)
IN(NO)
OFF
OPEN
ON
ON
OUT(NC)
OFF
CLOSE
Oversteering
(Only outside of front wheel)
IN(NO)
OFF
OPEN
OUT(NC)
OFF
CLOSE

ABS Warning Lamp module
The active ABS warning lamp module indicates the self-test and failure status of the ABS.The ABS warning lamp shall be on under the following conditions:
-
During the initialization phase after IGN ON. (continuously for 3 seconds).
-
In the event of inhibition of ABS functions by failure.
-
During diagnostic mode.
-
When the ECU Connector is separated from ECU.
-
Cluster lamp is ON when communication is impossible with CAN module.
EBD/Parking Brake Warning Lamp Module
The active EBD warning lamp module indicates the self-test and failure status of the EBD. However, in case the Parking Brake Switch is turned on, the EBD warning lamp is always turned on regardless of EBD functions. The EBD warning lamp shall be on under the following conditions:
-
During the initialization phase after IGN ON. (continuously for 3 seconds).
-
When the Parking Brake Switch is ON or brake fluid level is low.
-
When the EBD function is out of order .
-
During diagnostic mode.
-
When the ECU Connector is separated from ECU.
-
Cluster lamp is ON when communication is impossible with CAN module.
ESC Function/Warning Lamp
The ESC function/warning lamp indicates the self-test and failure status of the ESC.
The ESC function/warning lamp is turned on under the following conditions :
-
During the initialization phase after IGN ON. (continuously for 3 seconds).
-
When the ESC function is inhibited by system failure.
-
When the ESC control is operating. (Blinking - 2Hz)
-
During diagnostic mode.(Except standard mode)
-
Cluster lamp is ON when communication is impossible with CAN module.
ESC Off Lamp
The ESC Off lamp indicates the self-test and operating status of the ESC.
The ESC Off lamp operates under the following conditions :
-
During the initialization mode after IGN ON. (continuously for 3 seconds).
-
ESC Off lamp is On when the driver inputs the ESC Off switch.
ESC On/Off Switch
The ESC On/Off Switch shall be used to toggle the ESC function between On/Off states based upon driver input.
The On/Off switch shall be a normally open, momentary contact switch.Closed contacts switch the circuit to ignition.
Initial status of the ESC function is on and the switch toggles between On/Off states.
Components and Components Location
Components 1. HECU module2. Steering angle sensor (SAS)3. Rear wheel speed sensor4. Front wheel speed sensor ...

Schematic Diagrams
Circuit Diagram ESC connector input/output Pin NoDescriptionCurrent(m/A)Resistance(m/?)MAX1Battery 2 (+) 137102POWERTRAIN CAN LOW302503---4---5---6---7---8---9---10---11Parking brake switch10250 ...

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