Hyundai Santa Fe (DM): Description and Operation
Description of ESC
Electronic Stability Control (ESC) recognizes critical driving conditions,
such as panic reactions in dangerous situations, and stabilizes the vehicle
by wheel-individual braking and engine control intervention.
ESC adds a further function known as Active Yaw Control (AYC) to the ABS,
TCS, EBD and ESC functions. Whereas the ABS/TCS function controls wheel slip
during braking and acceleration and, thus, mainly intervenes in the longitudinal
dynamics of the vehicle, active yaw control stabilizes the vehicle about its
vertical axis.
This is achieved by wheel individual brake intervention 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
above signals, 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 prevents the wheel slip of drive direction by adding the
brake pressure and engine torque reduction 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.
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| 2. |
ESC operation
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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:
| - |
During the initialization phase after IGN ON. (continuously 3
seconds).
|
| - |
In the event of inhibition of ABS functions by failure.
|
| - |
During diagnostic mode.
|
| - |
When the ECU Connector is seperated 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 shallbe on:
| - |
During the initialization phase after IGN ON. (continuously 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 seperated 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 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 3 seconds).
|
| - |
ESC Off lamp is On when driver input 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 switch toggle the state.
Components and Components Location
Components 1. HECU module 2. Front wheel speed sensor 3. Rear wheel speed sensor 4. Yaw rate & Lateral G sensor 5. ABS Warning lamp 6. Parking brake/EBD warning lamp 7. ESC Function/Warning lamp 8. ...
Schematic Diagrams
Circuit Diagram - ESC (1) Circuit Diagram - ESC (2) Circuit Diagram - ESC (3) Circuit Diagram - ESC (4) ESC connector input/output Connector Terminal Specification Pin No Description 29 IGNITION1(+) High ...
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