GF72.29-P-4004S Pinch Protection, Power Windows, Function

GF72.29-P-4004S Pinch Protection, Power Windows, Function

Function
The pinch protection feature is only active with the automatic one- touch up feature. It is only effective in the upper opening area of the window from 4 to 230 mm. In the manual closing mode the pinch protection has no effect.

If the door control module recognizes that something is being pinched by the window by comparing the pulses received from the Hall sensors (number, pulse duration, pulse/space ratio) with the stored reference values, it stops actuation of the power window motor (M10/3, M10/4, M10/5 or M10/6) and moves the window back down (reverses the window) approx. 5 cm.

If the power window switch still was in the close position at the time of pinching, the close function is stopped immediately. After releasing the switch the window moves back down approx. 1 cm only.

Adaptation of reference values in control module
Since the power windows normally become harder to move in the course of time adaptation is accomplished in the door control module (N69/1, N69/2, N69/3 or N69/4) each time the window is opened/closed in the synchronized state. For this purpose the pulse pattern of the previously received signals from the Hall sensors (number, pulse duration, pulse/space ratio) is compared with the data stored and received last (old reference values) and stored as a new reference, if it is within the permissible tolerance range.

This adaptation is not accomplished when
- pinching is recognized
- the power window is locked up.

The values remain stored even when the power window is disconnected from the power supply or desynchronized.