How It Works
WARNING: This page does not describe the selected car, but rather 46 other vehicles, including the 2008 BMW M5, 2008 BMW 650i, 2007 BMW Z4, 2007 BMW M6, and 2007 BMW M5. However, it is still accessible from the selected car via links, so may be relevant.
The position sensor records the mechanical angle on the rotor of the positioner module. This angle is converted to a pulse-modulated signal.
The (Hella) position sensor output signal is a pulse-modulated signal. In the straight-ahead position, the cycle ratio is 50:50.
The position sensor is highly accurate: The resolution of the position sensor at reference point 50:50 is smaller than 0.2°.
The position sensor works as follows:
- Power Supply From The Stepper Motor Controller (SMC) 5 volts (+/- 10 %).
- Overvoltage Protection The overvoltage protection of the position sensor is in the stepper motor controller.
- Calibration The position sensor is calibrated for the respective positioner module by a test at the end of the assembly line (performed by the headlight manufacturer). The adaptation parameters for the positioner module are programmed in the position sensor.
- Defined Position For Straight-Ahead Position The position sensor has a defined position in relation to the headlights' straight-ahead position. This defined position is stored in the encoding data. The position may vary, depending on the type of headlight.
- Measuring Range The measuring range of the position sensor is from -17° to + 17°. This measuring range is not used to the full by the positioner modules.
- Position Sensor Map The position sensor map is a pulse-width-modulated signal.
- Measuring Accuracy The cycle ratio is registered in the range 5 % to 95 %.
- Default Value For The Position Sensor If the position sensor should fail, the headlights will be reset using a mechanical reference point (tolerance +/- 1°).