Hệ thống lái EPS doc

Torque Sensor Resolver Type– Torque sensor detects the twist of torsion bar, changes it into the electric signal, and outputs it to EPS ECU Main Shaft Input Shaft Torsion Bar l Pinion S

Trang 1

EPS (Electric Power Steering)

– Motor drives the rack directly

Resolver Type Torque Sensors

Steering Gear Unit

• Burushless Motor Rotational Angle

• Reduction Mechanism

[Specifications]

Rotational Angle Sensor

No of Turns Lock to Lock ?

Trang 2

Rotation Angle g

Sensor

Trang 3

Torque Sensor (Resolver Type)

– Torque sensor detects the twist of torsion bar, changes it into the electric signal, and outputs it to EPS ECU

Main Shaft (Input

Shaft) Torsion Bar

l

Pinion Shaft (Output

Resolver 2

Pinion Shaft (Output

Trang 4

– Torque sensor consists of resolver 1, 2 and torsion bar

– Resolver 1 of rotor portion is fixed to main shaft, resolver 2 of rotor portion is fixed to pinion shaft

portion is fixed to pinion shaft

Main Shaft (Input

Shaft) Torsion

Resolver 1 (Rotor Portion)

Pinion Shaft

Portion)

Trang 5

– Resolvers of rotor portion generate a relative angle difference of a twist of the torsion bar

Main Shaft (Input

Trang 6

– Characteristic of resolver

Exciting Coil Detection Coil 1

2

Trang 7

– Detection method of torque sensor

Stator Portion Rotor Portion Stator Portion

Signal A

Signal B

Trang 8

Signal A

Signal B

Trang 9

Signal A

Signal B

Trang 10

– One resolvor outputs two signals with which the phase lagged 90 degrees to detect a relative angle

Resolver (Rotor

Portion)

Output Signal (V)

i l

t Signal A

Signal B

Resolver (Stator

P ti )

t Signal B

AUTO

Portion) MANUA

L

Trang 11

– Resolver of rotor portion outputs the straight signal, when resolver of stator portion stayed

Resolver (Rotor

Portion)

Output Signal (V)

i l

t Signal A

Signal B

Resolver (Stator

P ti )

t Signal B

Portion)

Trang 12

– When vehicle is driven straight, resolver 1 and 2 output the signals of the same signal

[Resolver 1 Output Signal]

t

t t

t

Trang 13

– When steering is turned, relative angle difference is created between the resolver 1 and 2 of rotor portion

t

t t

t

Trang 14

– EPS ECU decides assist voltage to a EPS motor from difference in relative position of resolver 1 and 2

Trang 15

Motor (Brushless Type)

– Motor is concentric with rack shaft, and consists of rotation angle sensor, stator and rotor

Coil Stator

Rotor Magnet

Trang 16

Motor (Brushless Type)

Coil Protrusion for

Stator

Protrusion for Rotation Angle Sensor

Rack Shaft

S g

Sensor

Trang 17

Rotor Ball screw reduction gear is fixed to rotor

Trang 18

Ball screw reduction gear is fixed to rotor

Trang 19

Rotation Angle Sensor (Resolver Type)

– Detects the rotation angle of the motor for preventing torque

Signal B

Protrusion

Rotor Rack

Shaft

t Signal B

Trang 20

Steering Torque

High

Steering Torque

Trang 21

Regulates the amount of assist when the driver turns the steering Damper Control wheel while driving at high speeds, thus damping the changes in

the yaw rate of the vehicle body

V lt B t C t l

Boosts the battery voltage in the EPS ECU It maintains 0 volts when the driver does not turn the steering wheel or the vehicle is

b i d i t i ht It ff t i bl t l b t 27 t 34

Voltage Boost Control being driven straight It effects variable control between 27 to 34

volts in accordance with the load, when the driver is turning the steering wheel.

System Overheat y Estimates the motor temp based on the amperage and the current duration If the temp exceeds the standard it limits the Protection Control duration If the temp exceeds the standard, it limits the amperage to prevent the motor from overheating

Trang 22

– When malfunction occurs in EPS system, EPS ECU controls

following control;

• Turns on P/S warning light and fail-safe operationTurns on P/S warning light and fail-safe operation

Trang 24

0 0 /

Trang 25

assist control is continued

Trang 26

PIG power supply voltage

U0073 / 49 Control module communication bus off Amount of power assist is fixed for a 62.5 mph (100 km/h)U0104 / 45 Lost communication with cruise control module

U0105 / 41 Lost communication with fuel injector control module Prohibit steering assist control

Trang 27

Fail-safe

Trang 28

Initialization and Calibration

– Perform the initialization and calibration of EPS system in the

following cases

• Steering Wheel

Remove, install or replacing

Using the Hand-held Tester or

NOTE: These operation cannot be performed when the DTCs are

Trang 29

– Using the Hand-held tester

TRQ SENSOR ADJUST

* NOW PROCESSING * was exchanged.

-Difference of steering control effort

from left to right exists.

PRESS [ENTER]

C1515/C1525/C1581 were detected.

Trang 30

TRQ SENSOR ADJUST TRQ SENSOR ADJUST TRQ SENSOR ADJUST TRQ SENSOR ADJUST

Turn Power Switch

OFF and ON.

TRQ SENSOR ADJUST

-Check PS warning light is ON.

-Center the steering wheel.

TRQ SENSOR ADJUST

-Turn the steering wheel to the left greater than

Trang 31

-Turn the steering

wheel to the right

greater than

45 degrees

TRQ SENSOR ADJUST

-Center the steering wheel.

-Remove hands from the steering wheel.

-The steering wheel

TRQ SENSOR ADJUST

* NOW PROCESSING *

45 degrees.

-Turn the steering

back to the center.

The steering wheel will vibrate.

-Do not touch during vibration.

PRESS [ENTER]

NOW PROCESSING

TIME REMAINING:

[30 ] SEC PRESS [ENTER]

PRESS [ENTER]

[ ] SEC.30

Trang 32

Trang 33

– Using the intelligent tester-II

Select

Chassis

↓ EPS

Select

Chassis

↓ EPS

↓ Utility

↓ Torque Sensor

EPS

↓ Utility

↓ Torque Sensor

Trang 34

Trang 35

Trang 36

Trang 37

Trang 38

Trang 39

Trang 40

10

Trang 41

10

Trang 42

Trang 43

Trang 44

10

Trang 45

Trang 46

Trang 47

– If DTCs are outputted except C1515 / C1525

Trang 48

– Using the SST (09083-18040)

1 Initialization of EPS ECU

1 Connect terminals Tc,Ts and CG

and turn the ignition switch to ON

2 Disconnect and connect terminal

Tc 20 times within 20sec.

Trang 49

– Using the SST (09083-18040)

2 Calibration of motor rotation angle sensor

1 Connect terminals Ts and CG

and turn the ignition switch to ON

2 Turn the steering 45 degree

or more (both side)

Ts

Trang 50

– Using the SST (09083-18040)

3 Calibration of torque sensor

1 Connect terminal Tc after

calibration of motor rotation

Định dạng
Số trang	50
Dung lượng	4,21 MB