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

US6208101A · kind A · utility

Assignee

• BROSE FAHRZEUGTEILE GMBH & CO. · DE

Inventors

• Jurgen Seeberger · Baunach, DE
• Jorg Ubelein · Ebersdorf b.Coburg, DE

Key dates

• Filing date: Jan 11, 1999
• Grant date: Mar 27, 2001
• Expiry date: Jan 11, 2019

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02H7/0851
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A method for restricting the surplus force of an electrically controlled assembly operated by a foreign force, which can be used with particular advantage in connection with window lifters which are fitted with an anti-jam detection device. The method is characterized by a high automatic adaptation to the markedly fluctuating external conditions to which a window lifter is subjected, and by the compensation of system-conditioned fluctuations. The position of the assembly is continuously determined during the displacement process and at least one measured value correlated with the displacement force of the assembly is recorded in the inlet area of the stop position. This measured value is increased through the electronics unit by a predetermined amount and defined as a switch-off criterion so that the drive is switched off when this criterion is exceeded or understepped.