Method for the contactless approach of the lower stop position of a motor vehicle window operated by extraneous force

US6114822A · kind A · utility

Assignee

• BROSE FAHRZEUGTEILE GMBH & CO. KG, COBURG · DE

Inventors

• Jorg Ubelein · Ebersdorf b.Coburg, DE
• Roland Kalb · Rossach, DE

Key dates

• Filing date: Feb 4, 1999
• Grant date: Sep 5, 2000
• Expiry date: Feb 4, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G05B2219/45242
• WIPO field: Control
• WIPO sector: Instruments

Abstract

The invention relates to a method for contactless approach of a lower stop position of a motor vehicle window pane operated by extraneous force using a sensor device which during lowering of the window pane generates path-dependent signals and forwards them to an electronic evaluation unit in which the sensor signals are counted. During two separate phases (A) and (B) system deficiencies of a window raising mechanism are compensated and the pane is lowered. On reaching a certain counting state which lies in front of the position of the fixed contactless stop, a drive is switched off. The first phase (A) and the second phase (B) of the adjustment movement of the drive are separated by a boundary value (2) which reflects a system state of window winding raising mechanism so that the sensor signals of the first phase (A) can be associated with compensating cable slack and the sensor signals of the second phase (B) can be associated with the actual movement of the window. For determining the slowing-down path of the window pane which is to be expected the operating voltage of the drive is used in addition to the lowering speed of the window.