TLE4964-2M datasheet(10/91 Pages) INFINEON

10 / 91 page

Magnetic position sensors for highest energy efficiency and

functional safety in Electric Power Steering (EPS)

Position sensor applications in EPS are safety-related with

the highest safety level. The ISO 26262 standard sets high

requirements for the diagnostic coverage of random fail-

ures and the avoidance of systematic failures in order to

reach the highest safety rating on system level resulting in

a safety classification of the category ASIL D.

These demanding specifications can typically be achieved

by using redundant sensors as well as comparing their

signals in a microcontroller.

Compared to conventional hydraulic power steering solu-

tions, Electric Power Steering (EPS) enables higher energy

efficiency, increased steering functionality and reduced

space requirements in passenger vehicles.

Infineon offers dual-sensor solutions with two redundant

sensors in the place of one for all position sensor

applications in EPS. Our dual-sensor package integrates

two magnetic position sensors with separate supply pins

and separate signal outputs. They are electrically indepen-

dent thanks to galvanic isolation. This means that the two

sensors work independently, thereby increasing system

reliability.

The functionality of EPS is based on several system-side

position sensors, that measure the steering torque input

from the driver, the rotor position of the EPS motor, that

moves the steering rack and the steering wheel’s absolute

position.

Typical application for Infineon magnetic position sensors in EPS

Angle sensors

Steering torque

BLDC motor

TLE499x – linear Hall

sensor series

Steering torque

sensing

TLE4906 – switches

Torque index

sensor

TLE5014/TLE5012B – angle sensor

TLE5009 – angle sensor

TLE5501 – angle sensor

Steering angle sensing

TLE5x09D – dual-sensor angle

TLE5012BD – dual-sensor angle

EPS rotor

position sensing

Switches

Linear Hall

Sensors in

Electric Power Steering (EPS)

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