Process for limiting the excess force of an electrically controlled aggregate actuated by an external force when it nears its top or bottom stop positions, in particular for a motor vehicle window lifter nearing its closure position

A device for restricting surplus force of an electronically controlled window pane operated by a foreign force of a motor vehicle upon contacting at least one stop position, wherein an upper edge of the window pane reaches a stop of a seal, the device comprising:

• a position detector that continuously detects the position of the pane in at least one of during displacement of the pane and in an inlet area of the stop position;
• a recorder that records at least one measured value correlated with a displacement force of the pane after entrance of an upper edge of the pane into at least about 25% of a depth of an inner displacement path of a sealing area of the seal;
• and
• a switch-off criterion determined by one of increasing and decreasing the measured value through an electronics unit by a predetermined amount, wherein a drive is switched off and the window pane stops inside of the sealing area when this criterion is one of exceeded and understepped, respectively.

A method for restricting surplus force of an electronically controlled window lifter upon contacting at least one stop position in a sealing area of a seal, the method comprising:

• continuously detecting positions of a window pane during a displacement process;
• recording a measured value correlated with a displacement force of the pane after entrance of an upper edge of the pane into at least about 25% of a depth of an inner displacement path of the sealing area of the seal;
• and
• increasing the measured value through an electronics unit by a predetermined amount to define a switch-off criterion such that a drive of the window lifter is switched off and the window pane stops inside of the sealing area when this criterion is one of exceeded and understepped.