Patent ID: 6504332
Filing Date: 2003-01-07
Classification: H02H

Abstract:
A method for limiting the closing force of movable parts (16), in particular windows and sliding roofs in motor vehicles, which are driven by an electromotive adjusting drive (11), with at least the following steps:determination of the respective current motor speeds n based on periodic signals of a sensor (18) connected to the adjusting drive (11), calculation of a respective value &Dgr;n that is typical for the current change in the motor speeds, summation and storage of the respective current typical value &Dgr;n in a sum memory (24), starting of a time meter (28) and a limit value curve transmitter (30) when the summated value &Sgr;&Dgr;n exceeds a threshold value, comparison of the current limit value g(t) of the limit value curve transmitter to the values of the current summated values &Sgr;&Dgr;n, triggering of a measure for limiting the closing force and resetting of the time meter (28) and the sum memory (30) when the respective current value of the summated value &Sgr;&Dgr;n is equal to or greater than the respective current limit value g(t), and aborting of the comparison and resetting of the time meter (28) and the sum memory (30) when the respective current value of the summated value &Sgr;&Dgr;n is less than the respective current limit value gj(t) and remains constant within a preset tolerance &Dgr; and a preset time &Dgr;t.