TLE4963-2M datasheet(12/91 Pages) INFINEON

12 / 91 page

Magnetic torque sensing assembly

Application trend: fault tolerant

Conventional EPS systems, which use two linear Hall

sensors for ASIL D compliance, have to shut-down in the

event of a loss of one sensor signal. Therefore, the trend

in EPS systems is to increase availability by implementing

additional sensor signals or plausibility mechanisms.

To support this trend towards high-availability EPS

functionality, Infineon recommends the usage of two

TLE4998xD dual-sensors or two TLE4999x, each of them

with two highly accurate redundant Hall measurement

channels (main and sub) integrated on one single chip.

In case of one TLE4998xD or TLE4999x signal loss, the

remaining dual-sensor (TLE4998xD) or the single die two

channels (TLE4999x) in the system provides continued

operation of the EPS, avoiding an immediate system shut-

down.

Input sha

Output sha

Torsion bar

Multipole magnetic ring

Stator

Sensor (e.g. TLE4999I3)

Flux concentrator

Stator

Limp-aside,

degraded operation

for very limited time

Shut-down

(= sudden loss!)

ECU

Shut-down

Failure reaction

ECU

Soware,

plausibility

Limp-aside

Application trend: fault-tolerant EPS

New OEM safety goal: avoid sudden loss of steering support, up to ASIL-D

Failure reaction

Continued operation

Dual sensor

ECU

Fault-tolerant

Failure reaction

Dual sensor

Magnetic position sensors for the ultimate in energy efficiency and

functional safety in Electric Power Steering (EPS)

Sensors in

Electric Power Steering (EPS)

TLE4963-2M 데이터시트(PDF) 12 Page - Infineon Technologies AG

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