Robert Boschgmbh

Holger Pr&uuml;ssel

Karl-Heinrich Preis

Gerhard Knecht

In an arrangement for detecting pinching situations in electric drives, provided in particular for window and sunroof openers in motor vehicles, the voltage induced in the armature of the motor is used, the induced voltage being determined from the voltage across the motor terminals and the current flowing in the armature, in particular as the difference between the voltage across the motor terminals and the product of the armature current by the armature resistance which is obtained periodically whenever possible. The armature resistance is obtained from the voltage across the motor terminals and the blocking current of the motor, the latter being determined by extrapolation of the armature current determined at a certain point in time. The armature current is measured using a shunt resistor and optionally amplified, and the current signal obtained is averaged using a microcontroller-controlled integrator with adjustable, computed integration periods, and digitized using an analog-digital converter.

Growing community of inventors

Bühlertal, Germany

Holger Prüssel

Growing community of inventors

Bühlertal, Germany

Holger Pr&uuml;ssel

Holger Prüssel