Acura NSX 1991 Manual page 410

Main Menu
System Description
Function and Operation
Steering Sensor
The steering sensor consists of a torque sensor, an
interface, and the rotation sensor.
Torque Sensor
The torque sensor converts steering torque input and its
direction to voltage signals, in conjunction with the
interface.
A torsional force caused by steering operation is con-
verted to an axial movement of a slider core. A variable
differential transformer is installed around the slider
core.
Within the transformer are three coils, a primary coil on
the inside, and two secondary coils, one for right turns
and one for left turns.
Alternating current is passed through the primary coil
when the system is energized. The amount of mutual
induction from the primary coil to the secondary coils
changes depending on the position of the slider coil.
The input shaft and the slider are one piece. Rotation of
the shaft moves the slider in a circular direction. The
pinion is turned via the torsion bar. The slider core is
installed on the pinion shaft on grooves, and turns with
the pinion shaft.
When there is little resistance, the input shaft torsion
bar, pinion shaft, and the slider core turn together to the
same angle. The slider core does not move up/down.
When there is resistance on the input shaft (hard to steer situation), and the slider pin is turned at an angle by the steering
wheel, the torsion bar is twisted due to the resistance. Accordingly, the pinion shaft turns at a smaller angle. The differ-
ence in the turning angles changes the position of the slider pin in the groove, forcing the slider core upward or down-
ward, depending on the direction of the direction of the turn.
Table of Contents
INTERFACE
CIRCUIT
PRIMARY COIL
INPUT
SHAFT
TRANSFORMER
PINION GEAR
UPPER SECONDARY COIL
SLIDER
TORSION BAR
SPIRAL
GROOVE
ROTATION
SENSOR
GUIDE
PIN
SLIDER
WING
LOWER SECONDARY COIL