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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]