Steering angle sensor

Headlight control

Optical encoders, or separate LEDs and photodiode arrays are used in applications for angle detection as a steering angle sensor in vehicles.

Precise and reliable detection of the steering angle is an important challenge in the modern vehicle. This data is used not only for Electronic Power Steering (EPS) and Electronic Stability Control (ESC), but it is also necessary for the control of adaptive headlights, lane keeping assist or other advanced driver assistant systems (ADAS). These are the first steps toward partial autonomous driving. In particular, for steer-by-wire technology, where there is no mechanical connection between the steering wheel and the vehicle axle, the steering angle sensor is therefore essential.

The optical steering angle sensor works with an encoder module, which consists of an LED and a Photodiode Array, or a CMOS line sensor. A rotating encoder wheel is placed in the light spot. It has a special coding with holes and no holes, so that each photodiode measures “light” or “no light”, which are read as digital “high” and “low” signals. In this way, the sensor can count up and down from position zero to the angle α with a certain resolution, depending on the amount of slits and photodiodes (4 photodiodes in a row → 4 bit coding, 10 photodiodes in a row → 10 bit coding) and the dimensions of photodiodes and wheel.

Operating Temperature In special SMD package -40°C to + 125°C
Special plastic mold devices -40°C to +105°C
Customization possible, please contact us for further information
Scroll to Top