Torque Sensor; Magnetic Ring - Subaru Legacy 2015 Technicians Reference Booklet

2015 Legacy and Outback

Torque Sensor

The Torque Sensor delivers the driver's demand and force acting on the tires to the EPS Control
Module. This EPS uses a Flux Ring style sensor that detects torque acting on the torsion bar of
the Steering Rack input shaft. The sensor consists of a Magnet Ring, Flux Ring, Flux Collecting
Ring, and Flux Yoke.
Torque Sensor

Magnetic Ring

The Magnet Ring, containing alternating North and South poles, is fixed to the Torsion Bar. As
the Input Shaft rotates, resistance from the driver's demand creates torsion deforming the shaft.
This deformation rotates the Magnet Ring and varies the North and South magnetic flux lines that
are detected in the Flux Ring.
9-18
Input Shaft
New Technology Training
9-16
Input Shaft Cross Section
9-19
Magnet Ring
146
(Module 926)
9-17
9-20
Magnet Ring Poles
June 2014