Sliding/pop-up roof position measurement, function - GF77.20-P-3001A

MODEL 202.0 as of 1.6.97, 208.3, 210.0 /2, 220.0 /1 with CODE (414a) Glass electric sliding/pop-up roof 

MODEL 215.3 

MODEL 220.0 /1 with CODE (491) USA version 

MODEL 220.075 /175 with CODE (498) Japanese version 

Direction recognition 

Fig 1: Identifying Sliding/Pop-Up Roof Position Measurement, Function

Direction recognition 

Hall sensor 1, SR (M12b1) and Hall sensor 2, SR (M12b2) are located at the shaft of SR motor (M12/1). These react to the movement of the magnet. They supply one square-wave pulse for each rotation of the motor shaft.

The overhead control panel control module (N70) reads these Hall pulses. The overhead control panel control module (N70) recognizes the direction of rotation of the SR motor (M12m1) from the chronological offset of the Hall pulses from Hall sensor 1, SR (M12b1) and Hall sensor 2, SR (M12b2).

Position measurement 

The position counter in the overhead control panel control module (N70) counts the Hall pulses depending on the rotation direction of the SR motor (M12m1) recognized. The position counter is increased when the pop-up roof closes or the sliding roof opens. When the pop-up roof opens and the sliding roof closes the position counter is reduced. The zero position is defined as the pop-up roof open position, i.e. when the pop-up roof is fully opened the counter should be at zero. The zero position is set by the normalization  function. If the zero position is exceeded in the open direction, the count becomes negative.