1

ECB (ELECTRONICALLY CONTROLLED BRAKE)

SYSTEM

General– Basic construction and operation is same as LS460– Regenerative Brake Cooperative Control Function

2

Overall– Enhanced cornering ability to decrease an amount of roll

by controlling twist of the front / rear stabilizer bars for the vehicle posture control during cornering

To decrease rolling angle during cornering

To change steering characteristic by driving conditions

ACTIVE STABILIZER SUSPENSION SYSTEM

: Stabilizer bar effect

: Active stabilizer suspensionsystem effect

3

ACTIVE STABILIZER SUSPENSION SYSTEM

Main ComponentsDC/DC Converter for EPS and Active stabilizer

Rear Active Stabilizer Actuator

Rear Active Stabilizer ECU

Front Active Stabilizer ECU

Front Active Stabilizer Actuator

HV Battery Unit

Skid Control

ECU

Air Suspension ECU

Steering Control ECU

Damping Mode Select Switch

4

ACTIVE STABILIZER SUSPENSION SYSTEM

Major Difference from GS450hLS600hL/LS600h GS450h

Power Supply HV Battery Excusive BatteryDrive Voltage of Active Stabilizer Actuator

AC 46 V(Step down HV battery nominal

voltage)

AC 14 V(Battery voltage)

DTC Some DTCs are newly added and

discontinued

Output CAN SIL (Fr ECU)Reset Memory No required RequiredActive Test Available Data List 3 items are newly added

Test Mode Available(System Check)

5

ACTIVE STABILIZER SUSPENSION SYSTEM

System Diagram

Front Active Stabilizer Actuator

Motor Rotation Sensor

Meter ECU

DLC3

•Multi-information Display

•Master Warning Light•Buzzer

Rear Active Stabilizer Actuator

DC/DC Converter[EPS /Active

Stabilizer Suspension]

HV Battery

Speed Sensors

Skid Control ECU

Main Body ECU

Motor

Steering Angle Sensor

Suspension Control ECU

Yaw Rate SensorDeceleration

Sensor

Steering Control ECU

Motor Rotation Sensor

Motor

Front Active

Stabilizer Control

ECU

DC 46 V

DC 288 V

Driver Side Switch Module

Damping Mode Select Switch

Rear Active

Stabilizer Control

ECU

Center Console Switch Module

AC 46 V

AC 46 V

6

ACTIVE STABILIZER SUSPENSION SYSTEM

Vehicle Roll Angle– Amount of twisting the stabilizer bar are controlled based

on signals of actual turning angle of tire, vehicle speed, lateral acceleration, and AVS mode

: with System: without SystemLateral Acceleration

Vehic

le R

oll

Angle

CHARACTERISTIC OF ROLL ANGLE

OPERATING CONDITIONS• Shift position except “R” and “N”

range• Vehicle speed is satisfied following

condition

OFF

ON

5 km/h (3.2 mph)20 km/h (12.5 mph)

Vehicle Speed

7

CONDITIONSACTIVE STABILIZER ACTUATOR[STABILIZER BAR CONDITIONS]

System OFF Not fixed, not free

System ON

Not satisfied operating conditions

Fixed (Controlled by ECU)

Satisfied operating conditions

Active (Controlled by ECU)

In fail-safe Fixed (Controlled by motor short relay)

ACTIVE STABILIZER SUSPENSION SYSTEM

Active Stabilizer Actuator– Each stabilizer bar position is kept to the

neutral position by the vehicle’s weight, when system is OFF

Each stabilizer bar position is not fixed, however is not free

8

ACTIVE STABILIZER SUSPENSION SYSTEM

Warning Message– System condition check by multi-information display

SYSTEM CONDITION

MULTI-INFORMATION DISPLAY

MASTERWARNING LIGHT NOTES

System Malfunction ON

Malfunction detected in this

system

Diagnosis Mode

No DTC OFF System normal

Stored DTC ON DTC stored in

ECU

CheckActive Stabilizer

Suspension System

CheckActive Stabilizer

Suspension System

DIAG

Fr. Act. Stabi.

OK

DIAG

Fr. Act. Stabi.11

9

SELECT: CHASSIS > FRONT STABILIZER OR REAR STABILIZER > ACTIVE TESTTESTER DISPLAY TEST PART CONTROL RANGE DIAGNOSTIC NOTE

Stabilizer Check

Front active stabilizer actuator

The following operation is operated every one second automatically1. Front side of the vehicle leans to the right2. Keep above condition3. Return normal4. Front side of the vehicle leans to the left5. Keep above condition6. Return normal again

If operation is prohibited through fail-safe control, Active Test cannot be performed

Stabilizer Check

Rear active stabilizer actuator

The following operation is operated every one second automatically1. Rear side of the vehicle leans to the right2. Keep above condition3. Return normal4. Rear side of the vehicle leans to the left5. Keep above condition6. Return normal again

If operation is prohibited through fail-safe control, Active Test cannot be performed

SERVICE POINT (ACTIVE STABILIZER SUSPENSION SYSTEM)Active Test

– In active test mode, each active stabilizer control ECU operates each active stabilizer actuator automatically.

10

SERVICE POINT (ACTIVE STABILIZER SUSPENSION SYSTEM)

Active Test– If Active Test does not operate, test mode DTCs are output

DTC FOR ACTIVE TESTDTC NO. DIAGNOSIS ITEMS INSPECTION ITEMS

C194FOperation of Static Test Mode is Incomplete (Test Mode DTC)

Test mode operation errorSteering angle sensor

C1950Front Stabilizer Target Angle Not Attained (Test Mode DTC)

Active stabilizer actuatorsActive stabilizer ECUsWire harnessC1951

Rear Stabilizer Target Angle Not Attained (Test Mode DTC)

11

SERVICE POINT (ACTIVE STABILIZER SUSPENSION SYSTEM)

Initialization and Calibration Items– After disconnecting auxiliary battery

PARTS PROCEDURE

IF INITIALIZATION DOES NOT OPERATE, THE FOLLOWING FUNCTIONS ARE NOT

WORKED

Steering

Angle Sensor

Drive vehicle on a straight road at 35 km/h (22 mph) or more for 5 sec. or more

Active stabilizer control functions are not working (Roll angle may not decrease during cornering)

12

STEERING

Overall– Vehicle speed sensing type EPS system and VGRS system

are used for all models as STDMAJOR DIFFERENCE FROM LS460L / LS460, GS450h

LS600hL / LS600h

LS460L / LS460(Model with VGRS/

19-inch wheels) GS450hSteering Gear Type Rack and Pinion

Gear Ratio (Overall) 12.4 to 19.3 11.6 to 16.7 12.4 to 17.2

No. of Turns Lock to Lock 2.5 to 3.9 2.4 to 3.5 3.16

Drive Voltage of EPS Motor

AC 46 V(Step down HV

battery voltage)

AC 46 V(Boost up

Battery voltage)

AC 14 V(auxiliary battery voltage)

Power Supply Device

DC/DC Converter for EPS and Active

Stabilizer

Boost Converter(for EPS)

13

STEERING

System Diagram

Steering GearUnit

VGRS Actuator

Lock Solenoid

MotorParking Assist

ECU

DC 33 – 46 V

EPS Motor

Rotation AngleSensor

Power Steering ECU

HV Battery

AC33 – 46

V

DC 288 V

DC 12 V

Steering Control ECU Rotation Angle

Sensor

Suspension Control ECU

Auxiliary Battery

Driving Support ECU

HV ECU

DC/DC Converter[EPS /Active Stabilizer

Suspension]

Torque Sensor

DLC3

Steering Angle Sensor

Yaw Rate SensorDeceleration

Sensor

Combination Meter

Skid Control ECU

Speed Sensors

14

STEERING

Layout of Main Components

Steering Control ECU

Auxiliary Battery

DC/DC Converter for EPS and Active

stabilizer

HV Battery Unit

Skid Control ECU

Parking Assist ECU

Driving Support ECU

Power Steering ECU

Air Suspension ECU

VGRS Actuator•Motor•Rotation Angle Sensor

•Lock Solenoid

HV ECU

Steering Gear Unit

•Torque Sensor•EPS Motor•Rotation Angle Sensor

15

STEERING

DC/DC Converter for EPS and Active Stabilizer– Usually, DC/DC converter steps down the HV battery voltage

from DC 288 V to DC 46 V and supplies electrical power to the power steering ECU.

HV ECU

DC 288 V

DC 12VBoost Converter

Circuit

Boost CircuitAuxiliary Battery

HV Battery

To Fr/Rr Active Stabilizer ECU

EPS Motor

AC 46 V

Step Down Circuit

Shut Down Circui

t

Power Steering

ECU

DC/DC CONVERTER[EPS /Active Stabilizer Suspension]

High-voltage use permission signal

16

STEERING

DC/DC Converter for EPS and Active Stabilizer– When there are any HV battery voltage problems, the DC/DC

converter temporarily converts the auxiliary battery voltage from DC 12 V to approx. DC 33 V and supplies electrical power to the power steering ECU.

HV ECU

DC 288 V

DC/DC CONVERTER[EPS /Active Stabilizer Suspension]

DC 12VBoost Converter

Circuit

Auxiliary Battery

HV Battery

To Fr/Rr Active Stabilizer ECU

High-voltage use permission signal

AC 46 VAC 33 V

Boost Circuit

Step Down Circuit

Power Steering

ECU

Shut Down Circui

t

EPS Motor

17

EPS VGRSInitializati

onCalibratio

nInitializati

onCalibratio

nBattery reconnection * - *

Replacement• Power Steering ECU

Replacement• Steering Control ECU

Removal/installation, replacement or adjustment of steering system parts

Replacement•Steering Gear Unit

SERVICE POINT (STEERING)

Initialization and Calibration for Steering System *: Straight-ahead judgment

conditions are required

18

REFERENCE

19

ACTIVE STABILIZER SUSPENSION SYSTEM

Active Stabilizer Actuator – DC brushless motor and reduction gear twist stabilizer bar

on both sidesStator Coil NOTE:

Active stabilizer actuator is non-disassemble parts

Front Stabilizer Bar (LH)

Front Stabilizer Bar (RH)

Brushless Motor

Reduction Mechanism(Strain Wave Gearing Mechanism)

Rotor Gear

Front

Motor Rotation Sensor (3 Hall ICs)

20

ACTIVE STABILIZER SUSPENSION SYSTEM

Active Stabilizer Actuator– Reduction mechanism

• Both stabilizer bar shifts 2 teeth per wave generation 1 rotation 400 teeth 402 teeth

Gear Ratio : 1/200

Wave Generator

Circular Gear

Rotor Gear

Front Stabilizer Bar (LH)

Flexible Gear

Front Stabilizer Bar (RH)

21View from stator gear side

(Steering wheel side)

REFERENCE (ACTIVE STABILIZER SUSPENSION SYSTEM)

Reduction Mechanism– Construction

Ball Bearing is between flexible gear and wave generator

Stator Gear

Wave Generator

Flexible Gear

NOTE:Indicate this is the reduction mechanism as VGRS system for GS430 exampleNot meshing

Meshing

22

REFERENCE (ACTIVE STABILIZER SUSPENSION SYSTEM)Reduction Mechanism

– Operation of strain wave gearing

Stator Gear(102 teeth)

Wave Generator

Flexible Gear(100 teeth)

Motor Shaft

Ball Bearing(Between flexible gear and wave generator)

View from stator gear side

(Steering wheel side)

23

REFERENCE (ACTIVE STABILIZER SUSPENSION SYSTEM)Reduction Mechanism

– Operation of strain wave gearing

Stator gear fixed

View from stator gear side

(Steering wheel side)

24

STEERING

VGRS Actuator– VGRS actuator is relocated and spiral cable is discontinued

Motor

Input

Output

Lock Mechanism

Torque Sensor(for EPS)

Pinion Shaft

Strain Wave Gearing

Torsion Bar

25

STEERING

VGRS Actuator– Strain wave gearing [ ]: Number of

teeth

GS430LS460

Stator Gear[102]

Driven Gear[100]

Flexible Gear[100]