Electric Power Steering Systems

CAT.NO.S1001E - 2

Our goal is sensational driving experiences – JTEKT
Offering Greater Peace of Mind with Advanced Driver Assistance Systems
that Enable Experiencing Steering Feel
"Driving," "Cornering" and "Stopping."
Of the three basic vehicle performance functions, our forte is "Cornering."
Committed to producing superior steering equipment,
JTEKT developed the world's first electric power steering (EPS) system in 1988.
Today, our products hold No. 1 market share around the globe.

Electric Power Steering Systems◉ Collision safety◉ Functional safety◉ Advanced Driver Assistance Systems (ADAS)◉ Improved driving stability◉ Autonomous driving

Improvedfuel efficiency＋
Advanced safety
performance◉ High fuel efficiency

2005

2010

◉ Preventive safety◉ Improved

steering performance◉ Modularization◉ Recycling

2015◉ New mechanisms◉ Materials substitution

2020

2025

Reduce accidents
Automation

SafetyReliability

ComfortConvenience

ComfortConvenience

Resource savings
Reduce CO2

Environment
Efficiency

2030

Electric Power Steering Systems

01 02

ADAS

SBW

Advanced Driver Assistance Systems

Steer - by - Wire

Advancements in ADAS Technologies

The Evolution of Steering Systems

In the near future, transformations will occur not in the vehicle society,but in the way we live as well

ADAS

Thanks to higher computer processing capabilities and more accurate,

Advanced Driver Assistance Systems

Autonomous driving level

inexpensive peripheral recognition sensors such as onboard radar andDriver’s role (example)

cameras, modern-day vehicles can detect the periphery and driving conditions
with high precision. Accordingly, the practical application of active safety isadvancing, perhaps best represented by collision avoidance braking.

Peripheral
recognition

the focus of NCAP* ratings. As a result, their widespread use is anticipated.

autonomous driving systems that take over driver operation may be feasible with

Level 5

System initiative

Monitoring
the driving environment

Information
processing

Reading: OK

Sleeping: OK* Operation by
driver when necessary* Vehicle is controlled by system in order tominimize risk at the time of an emergency

SBW

Communicationof related fatalities. These systems are gradually becoming compulsory and arepotential for further advancements from the current Level 2-3 status to fully

Level 4

Driver not required

Additional car functions

automatic parking systems and lane departure warning / lane-keeping support

In regards to enhancing Advanced Driver Assistance Systems (ADAS), theLevel 3

Driver’s initiative

Technologies withadvanced diversification / integration

Additionally, driver assistance systems openly using EPS control, such assystems, are contributing to the reduction of traffic accidents and the number

Level 2

Cameras / Sensors / Radar

Three basic vehicle functions
Driving

Turning

Vehicle centralized
ECU

ClutchPassenger

Stopping

vehiclethe expansion of applicable roads predicted for the future. Such technologies

EPS

will not only transform the way we drive, but also how we live as well.

(w/clutch)(No-link)

A public vehicle collision test that involves crashing new cars and assessing the passenger safety level.

Steering system* NCAP (New Car Assessment Program)Steering actuator+
Hydraulic power steeringLargevehicleHydraulicpower source

Method toachieve autonomous
driving level

SoftwarebackupHardwareredundancy

Complete hardware redundancy
including power supply(JTEKT safety concept)( JFOPS 2 )( JFOPS 3 )( JFOPS 4 )JFOPSJTEKT Fail-OPerational System

JTEKT concept of safety is defined from 0 to 4.

What is redundancy? By duplicating (making redundant) systems forfunctions required to have high reliability, safety is secured by the remaining
functions even if a component of the system fails (redundant design).

Electric Power Steering Systems

03 04

SBW
Steer - by - Wire

Merits of Steer-by-Wire
Freedom in communication between the driver and system during ADAS operation(able to freely control both steering wheel and tires)

1. If collision avoidance operation is necessary, not only the steering wheel, but also the tire angle can be controlled appropriately
2. Changes in vehicle orientation are reflected in steering wheel movement, providing steering sensation

Achieving ideal steering properties
1. Improved vehicle response / traceability / stability when changing lanes

SBW
EPS

2. Improved handling at low speeds, improved driving stability at high speeds
Steering wheel angle

Small tire angle

Large tire angle

Even at the same
steering angle

At low speeds

At high speeds

3. Conveys the necessary information from the road surface
while blocking out disturbance, thus alleviating driver fatigue
Cobblestone

Vehicle centralized
ECU

No-link SBW enables freedom of layout andcontributes to expanding the vehicle interior spaceNo-link SBW

JTEKT responds to market demand
as a steering system suppliersupporting a safe and exciting
vehicle society
Electric Power Steering Systems

05 06

A Confident, Relaxing Driving Experience…
That's what our steering systems provide

JTEKT products not only realize steering performance matching vehicle requirements (e.g., body, suspension, tires, brakes anddrive-train), our steering systems act as a human-machine interface where the driver's intentions are delivered to the vehicle andsupplemental / accurate information is transmitted back to the driver, making it possible for the driver to feel "happier," "safer" and"more comfortable" when driving the vehicle.

Steering System Configuration example : DP-EPS

Basic steering operation example : DP-EPS

Definition of steering system: Components used to control (steer) the direction a vehicle is moving; in short,the equipment for changing the direction of the tires.

Steering wheel
Interface used by the driver to transmit desired directionof travel to the steering system

Intermediate shaft

Steering
force

Shaft connecting the steering column to the pinion gear

1

2 Torque sensor

1

Steering wheel is turned

2Torque sensor detects torque signal,
which is then input into the ECU

3

ECU adds electric current to the motor
based on torque signal and vehicle speed

Sensor that detects steering torque from the steering wheel

3 ECU

Calculates the amount of power-assist required
according to driver’s steering force and vehicle speed signal

Steering column

Motor

Attaches the steering wheel axle inside the cabin, and is equippedwith an energy absorption mechanism to dissipate impact energy
and reduce injury to the driver at the time of a collision

Outputs rotating torque according to the required
power-assist calculated

4Motor rotating torque is increased by the
reduction gear and transmitted to the pinion

5

Pinion rotating torque (supplemental
steering torque) on the power-assist sideand pinion rotating torque (steeringrotating torque) on the steering-wheelside are converted to rack axial force tochange tire direction

Motor electric current(Motor rotating torque)

4 Reduction gear

Gear mechanism that increases the rotational
torque generated by the motor and transmits it to
the pinion gear

Pinion rotating torque on
power-assist side

(Turning right)(Turning left)

０5

Rack axial force

Rack axial
force

Pinion rotating torque on
steering-wheel side

Torque signal
PinionPinion(force applied to change tire direction)

Low vehicle speed
High vehicle speed

Rack-and-pinion gear
Converts the rotating motion of the steering wheel
input by the driver to straight horizontal movement to
the rack bar via the pinion gearStandard System Proposal

System Features by Type
UA/A

B

C

D

E

F
SUV/P-UP

Vehicle segment

UA/A

Column-assist

B

C

D

E

F

Rack-assist

SUV/P-UP

Since the motor and ECU are inside the cabin,waterproofing is not required andthere is no influence on engine and transmission layout

Recommended

C-EPS

Column-assist

Application range

Excellent steering performance as the result of
minimal friction between the time ofturning the steering wheel and start of rack movement

Steering system
Recommended

P-EPS
Rack
-assistDP-EPS
RP-EPS
H-EPS

Recommended

Application range

JTEKT EPS systems are compatible for most automobiles, from small vehicles to large SUVs

Optimum steering systemfor compact vehicles with small rack force

Optimum steering system
for medium- to large-sized vehicles
that require better steering performanceElectric Power Steering Systems

07 08

C-EPS

DP-EPS● Ideal for compact vehicles with small engine compartment: power-assist unit is located in the steering column● Rack-assist realizes excellent steering feel with high rigidity and superior dynamic performance● Introduced as the world's first EPS in 1988

● System structure with flexible mounting freedom realized by separating the assist unit from the steering wheel axle

● Superior safety, comfort and environmental performance based on technologies and● Enhanced degree of freedom in specific stroke on the steering-wheel side realized byRR

adopting an optimal design to reinforce the assist unit

experience accumulated since its introduction● System with excellent safety, comfort and environmental performance realized through the application of proven technologies

ColumnColumnMotor / ECUTorque sensor
Stable operation andhigh collision safety performance realizedCompact, lightweight, high-efficiency
integrated motor / ECUTorque sensor

Intermediate shaft

Compact and simple design andhigh performance realized

Stable operation andhigh collision safety performance realized

Motor / ECU

C-EPS system

Compact, simple, high-performance sensor
resistant to water realized

Combined sliding load and rigidity

DP-EPS system

ColumnColumnTorque sensor
Reduction gear

Reduction gear
Low friction and quiet performance realizedCompact, lightweight, high-efficiency
integrated motor / ECU resistant to water

Motor / ECUIntermediate shaft

Intermediate shaft

Reduction gear

Torque sensor

Intermediate shaft

Rack-and-pinion gear

Combined sliding load and rigidity

High-strength and high rigidity realized

Both low friction and quiet performance realized
Orthogonal / Cross-type worm gear setup improves
installation flexibility

Rack-and-pinion gear

Rack-and-pinion gear
Pinion with dual-axle support realizes stable
rack behavior

Reduction gear

Motor / ECU

Rack-and-pinion gear

Electric Power Steering Systems

09 10

RP-EPS

P-EPS● Rack-assist realizes excellent steering feel with high rigidity and superior dynamic performance● Small / compact system adopted in response the engine room environment● Easier installation realized with adoption of high-output, compact reduction gear

● System with excellent safety, comfort and environmental performance realized throughRR

the application of proven technologies● System with excellent safety, comfort and environmental performance realized through the applicationof proven technologies
Motor / ECUColumnP-EPS system
Motor / ECUTorque sensor

Intermediate shaft

Motor / ECU

Rack-and-pinion gear

Compact, lightweight, high-efficiency
integrated motor / ECU resistant to water

Reduction gear

Torque sensor

World's smallest packaging developed using
exclusive bearing design
Compact, simple, high-performance sensor
resistant to water realized

RD-EPS mass-production experience accumulated
for more than 10 years utilized to develop a newball screw configuration with excellent
noise / vibration (NV) performance

Reduction gear

Compact, lightweight, high-efficiency
integrated motor / ECU resistant to water

H-EPS

R

Column● Excellent safety, comfort and environmental performance realized using

an energy-saving hydraulic power steering system equipped with an electric pump

Rack-and-pinion gear

● Extremely flexible installation and ability to use for EV driving realized by adopting an independent electric pump

High-strength, high rigidity realized

Intermediate shaft

Torque sensor● Excellent steering feel and improved fuel efficiency realized through optimum discharge setting (MAP) and special valve tuning

Electric pump / ECU(power pack)

H-EPS system
ColumnHelical gear reduces pulsation,and compact / lightweight design realized

Rack-and-pinion gear
Motor / ECUHydraulic power steering(HPS) gear

Reduction gear

Intermediate shaft
HPS gear

RP-EPS system
Comfortable steering feel realizedby optimal tuning of low-flow valve

Electric pump / ECU (power pack)

Electric Power Steering Systems

11 12

Share No.1

One out of every three vehicles in the world is equipped with JTEKT electric power steering (EPS)

2017

※1

Unit : 10,000

Start of production of
RP-EPS

Total production volume

100 million units

2000

PRODUCTION QUANTITY

10090( April 2015 ) ※2

Quantity of carbon dioxide reduction

1988

2011

2004

Start of production of
C-EPS (For small car)

1500

Start of production of
RD-EPS

70

Start of production of
E-VGR

Start of production of
C-EPS

The World First

80

Start of production of
DP-EPS

2002

2001

60
50

(For compact car)

1000

1991

Start of production of
H-EPS

500

1994

40

Start of production of
P-EPS

30

Start of
Manual Steering

20

Start ofPower Steering

1960 1970 1980

Unit : 10,000t (CO2)

10

1988

1990

1992

1994

1996

1998

2000

Safer, More Reliable Power Steering Systems to Customers Worldwide

2004

2006

2008

2010

2012

2014

2016

2018

Advanced Research & Development Facilities for Producing Next-generation EPS Systems
JTEKT R&D centers exchange information around the world, enabling the company to accurately understand market
demand and provide the newest / best / optimal systems to meet the diversified needs of our customers.

GLOBAL NETWORK
1
4
1

2002

1
7
1

X-Ray CT scanner

EUROPE

JAPAN

Vehicle evaluation incold regions

Steering column
impact testing apparatus

Power steering systemenergy consumption
measuring apparatus

Electromagnetic anechoic chamber

Proving Ground Enables Testing / Evaluations Simulating Roads Worldwide
Fully utilizing our knowledge as a world-leading systems supplier, JTEKT conducts driving evaluations and analyses of products installed in vehicles.
We exhaustively pursue the highest standards in product safety and operation on a test course capable of simulating various road and weather
conditions around the world. As a total systems supplier, our highest value is to provide our customers with products that deliver outstanding
performance and the best quality that help to make automobiles that are more than just fun to drive.

NORTH
AMERICAASIASOUTHAMERICA2
102

Regional headquarters
Steering manufacturing
Technical centers

2
1■ Iga Proving Ground・Site area: 500,000m2
・Course area: 170,000m2
・Combined circuit length: 2,200m
・Dynamics pad area: 54,000m2■ Iry JTEKT European Proving Ground・Straight-line track ・Winding track
・Fording track ・Dynamics pad
・Noise evaluation track

・Site area: 125,000m2
・Course area: 59,000m2
・Dynamics pad area: 43,000m2

・Straight-line track ・Dynamics pad
・Low friction track
・Noise and vibration evaluation track

Electric Power Steering Systems

13 14

OFFICESJTEKT NORTH AMERICA CORPORATION

47771 Halyard Drive, Plymouth, MI 48170, U.S.A.
Tel: 1-734-454-1500
Fax: 1-734-454-7059

JTEKT AUTOMOTIVE NORTH AMERICA, INC.
55 Excellence Way, Vonore, TN 37885, U.S.A.
Tel: 1-423-884-9200
Fax: 1-423-884-9295

PT.JTEKT INDONESIA

Jl.Surya Madya Plot Ⅰ-27b, Kawasan Industri Surya Cipta, Kutanegara,
Ciampel, Karawang Jawa Barat, 41363 INDONESIA
Tel: 62-267-8610-270
Fax: 62-267-8610-271

JTEKT (THAILAND) CO., LTD.

172/1 Moo 12 Tambol Bangwua, Amphur Bangpakong, Chachoengsao,
24180, THAILAND
Tel: 66-38-533-310〜7
Fax: 66-38-532-776

JTEKT KOREA CO., LTD.
-Seoul Head Office-Seong-do Bldg 13F, 207, Dosan-daero, Gangnam-gu, Seoul 06026, KOREA
Tel: 82-2-549-7922
Fax: 82-2-549-7923-Busan Office-

The Korean Teachers' Credit Union Hall 3F, 192,
Jungang-daero, Dong-gu, Busan, KOREA
Tel: 82-51-463-4830
Fax: 82-51-463-4831

TAIWAN JTEKT CO.,LTD.

NO.23, Guangfu N.Road, Hukou Township, Hsinchu, Country 303, TAIWAN
Tel: 886-3-597-2453
Fax: 886-3-597-4687

JTEKT (CHINA) CO., LTD.
-Head Office (Shanghai)-Room 25A2, V-Capital Building, 333 Xianxia Road,
Changning District, Shanghai 200336, CHINA
Tel: 86-21-5178-1000
Fax: 86-21-5178-1008-Shanghai Branch-

Room 25A2, V-Capital Building, 333 Xianxia Road,
Changning District, Shanghai 200336, CHINA
Tel: 86-21-5178-1016
Fax: 86-21-5178-1618-Tianjin Branch-

Room 1308, The Exchange 2, 189 Nanjing Road,
Heping District, Tianjin 300051, CHINA
Tel: 86-22-8319-5180
Fax: 86-22-8837-3556-Guangzhou Branch-

Room 1007, Tower-A Centre Plaza, No.161 Linhexi Road,
Tianhe District, Guangzhou, Guangdong 510620, CHINA
Tel: 86-20-3825-1241
Fax: 86-20-3825-1248-Chongqing Branch-

Room 14-2, Block 3, Jinkai Sincere Center, No.68 Jinkai Road,
Northern new District, Chongqing 401121, CHINA
Tel: 86-23-6305-6066
Fax: 86-23-6305-6077-Wuhan Branch-

Room 2211, Office Building, Oceanwide Square,No.198 Yuncai Road, Wuhan, Hubei 430022, CHINA
Tel: 86-27-8556-9691
Fax: 86-27-8556-9690-Changchun Branch-

Room 1408, Zhongyin Building, No.727 Xi'an Road,
Changchun, Jilin 130061, CHINA
Tel: 86-431-8892-8680
Fax: 86-431-8892-8902-Hangzhou Branch-

Room 3207, Wanyin International Building, No.100 Minxin Road,
Jianggan District, Hangzhou, Zhejiang, CHINA
Tel: 86-571-8110-6131
Fax: 86-571-8110-6132

JTEKT EUROPE S.A.S.
-Office-

ZI, Rue du Broteau, CS 70001, 69540 Irigny, FRANCE
Tel: 33-4-7239-4444
Fax: 33-4-7851-2188-Brussels Office-Bulgicastraat 13, 1930 Zaventem, BELGIUM
Tel: 32-2-541-4765
Fax: 32-2-541-4702-Munich Office-

Am Soldnermoos 17, 85399, Hallbergmoos, GERMANY
Tel: 49-0-811-8899-628
Fax: 49-0-811-8899-610-Beijing Branch-

Room 1012, Fortune Building, No.5 Dong San Huan North Road,
Chaoyang District, Beijing 100004, CHINA
Tel: 86-10-6538-8070
Fax: 86-10-6538-8077

PUBLISHERJTEKT CORPORATION NAGOYA HEAD OFFICE

No.7-1, Meieki 4-chome, Nakamura-ku, Nagoya, Aichi 450-8515, JAPANJTEKT CORPORATION OSAKA HEAD OFFICE

No.5-8, Minamisemba 3-chome, Chuo-ku, Osaka 542-8502, JAPANSales & Marketing Headquarters

No.5-8, Minamisemba 3-chome, Chuo-ku, Osaka 542-8502, JAPANThe contents of this catalog are subject to change without prior notice. Every possible
effort has been made to ensure that the data herein is correct; however, JTEKT cannot
assume responsibility for any errors or omissions.

Tel:81-52-527-1900

Fax:81-52-527-1911

Tel:81-6-6271-8451

Fax:81-6-6245-3712

Tel:81-6-6245-6087

Fax:81-6-6244-9007

Reproduction of this catalog without
written consent is strictly prohibited.

CAT.NO.S1001E - 2

Printed in Germany

17.09-1CCH（ 13.11）