Hyundai Palisade: ESP(Electronic Stability Program) System / Description and operation

Hyundai Palisade (LX2) 2020-2024 Service Manual / Brake System / ESP(Electronic Stability Program) System / Description and operation

Description of ESP
ESP recognizes critical driving conditions, such as panic reactions in dangerous situations, and stabilizes the vehicle by wheel-individual braking and engine control intervention.
ESP adds a further function known as Active Yaw Control (AYC) to the ABS, TCS, EBD and ESP 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.
ESP 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 ESP 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.

Hyundai Palisade. Description and operation

Description of ESP Control
ESP 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/ESP warning lamp. (fail-safe warning)

Hyundai Palisade. Description and operation

Input and Output Diagram

Hyundai Palisade. Description and operation

ESP Operation Mode
1.
STEP 1
The ESP analyzes the intention of the driver.

Hyundai Palisade. Description and operation

2.
STEP 2
It analyzes the movement of the ESP vehicle.

Hyundai Palisade. Description and operation

3.
STEP 3
The HECU calculates the required strategy, then actuates the appropriate valves and sents torque control requests via CAN to maintain vehicle stability.

Hyundai Palisade. Description and operation

ESP Hydraulic System Diagram
1.
ESP Non-operation : Normal braking.
Solenoid Valve
Continuity
Valve
Motor Pump
TC Valve
IN (NO)
OFF
OPEN
OFF
OFF
OUT (NC)
OFF
CLOSE

2.
ESP 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

Warning Lamp Control

Hyundai Palisade. Description and operation

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.
ESP Function / Warning Lamp (ESP System)
The ESP function/warning lamp indicates the self-test and failure status of the ESP.
The ESP function/warning lamp is turned on under the following conditions :
During the initialization phase after IGN ON. (continuously 3 seconds).
When the ESP function is inhibited by system failure.
When the ESP control is operating. (Blinking - 2Hz)
During diagnostic mode.(Except standard mode)
Cluster lamp is ON when communication is impossible with CAN module.
ESP OFF Lamp (ESP System)
The ESP Off lamp indicates the self-test and operating status of the ESP.
The ESP Off lamp operates under the following conditions :
During the initialization mode after IGN ON. (continuously 3 seconds).
ESP Off lamp is On when driver input the ESP Off switch.
ESP ON / OFF Switch (ESP System)
The ESP On/Off Switch shall be used to toggle the ESP 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 ESP function is on and switch toggle the state.

    Components and components location

    Components 1. ABS control module (HECU) 2. Front wheel speed sensor 3. Rear wheel speed sensor 4. ABS warning lamp 5...

    Schematic diagrams

    Circuit Diagram Terminal Function PIN No Desciption Current Max Min 1 Voltage supply for pump motor 39A 10 MΩ 2 RR EPB motor power 30A 10 MΩ 3 RR EPB motor ground 30A 10 MΩ 4 Clutch stroke sensor signal - - 5 Local CAN High 30 mA - 6 Electric parking brake signal 1 20 mA 250 MΩ 7 Electric parking brake signal 2 20 mA 250 MΩ 8 Electric parking brake signal 3 20 mA 250 MΩ 9 Electric parking brake signal 4 20 mA 250 MΩ 10 - - 250 MΩ 11 - - - 12 RL EPB motor ground 30A - 13 RL EPB motor power 30A 10 MΩ 14 Ground for solenoid valves and ECU 30A 10 MΩ 15 - - 10 MΩ 16 - - 250 MΩ 17 ESP OFF switch signal 16...

    Other information:

    Hyundai Palisade (LX2) 2020-2024 Service Manual: Components and components location


    ..

    Hyundai Palisade (LX2) 2020-2024 Service Manual: Description and operation


    Description MDPS (Motor Dirven Power Steering) system uses an electric motor to assist the steering force and it is an engine operation independent steering system. MDPS control module controls the motor operation according to information received from the each sensor and CAN (Controller Area Network), resulting in a more precise and timely control of steering assist than conventional engine-driven hydraulic systems...

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