Anti-trap circuit (not on the rear power windows on the E64)

The anti-trap function is active during the entire window movement in the closing direction. The indirect anti-trap function does not prevent all entrapment, but limits the maximum permissible entrapment force (closing force limit to maximum of 100 N).

The anti-trap function is only enabled once the power windows have been successfully initialized and automatic closing (one-touch closing) is possible.

Initialization of front power windows:

During the first operation, only the upper stop on the side window has to be learned during initialization. To do this, the side window must be moved to the upper stop. No characteristic curve is learned for the front power windows. The window does not need to move to the lower stop.

Initialization of rear power windows:

During first operation, the characteristic curve must be standardized and learned during initialization. During standardization, the zero position of the window movement is determined at the upper and lower stops. In addition, during initialization the development of the closing force is measured over the entire closing movement and permanently stored = learning the characteristic curve).

The mechanical forces for the closing procedure vary according to the ambient temperature and ageing. Consequently, the closing force is relearned each time the sunroof closes, so that the anti-trap function can adjust accordingly.

In each subsequent closure, the closing force currently needed is calculated and compared with the stored value. If the difference between the two force values is over the predefined trigger threshold, the side window opens immediately. The opening procedure can be coded so that it is country-specific.

The anti-trap function can be disabled in the panic mode (see EMERGENCY CLOSING AND PANIC MODE ).

If the anti-trap function fails (e.g. faulty Hall sensors), automatic closing is not possible (one-touch closing).