Steering Angle Sensor: Description and Operation

ANGULAR VELOCITY SENSOR





Electronic Power Steering (EPS) equipped vehicle has an Angular Velocity Sensor (AVS) in multi-function switch. AVS is composed of a set of photo interrupters (Light Emitting Diode [LED]), photo TR and slitted disc).

The slitted disc has 18 outer slits for detecting the steering wheel rotating direction and angular speed. And a inner slit is provided for checking whether the wheel position is within neutral or not. 2 sets of LED and photo TR check the rotation of steering wheel calculating the degrees per time through on, off photo TR, and a set of LED and photo TR is used to sense the wheel location.

With the signal from the sensors, the EPS control module miscellaneously decides the current flow to solenoid valve from 0A to 1A compensating steering wheel effort.