Variable drive with protection against jamming for movable parts

US6194855A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Gunnar Lochmahr · Leonberg, DE
• Johannes Heib · Bühl, DE
• Volker Aab · Lichtenau, DE

Key dates

• Filing date: Jan 13, 1999
• Grant date: Feb 27, 2001
• Expiry date: Jan 13, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G05B2219/49161
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

In a displacement drive that provides an obstruction prevention function for movable parts, in particular such as windows and sunroofs in motor vehicles, a decrease in the rotation speed or velocity of the drive is provided in order to achieve a predefined spring rate in specific displacement ranges so as to lower the kinetic energy. Within the predefined range before the closed position is reached, the rotation speed and/or the output of the drive is reduced linearly. The reduction to a minimum rotation speed or minimum output takes place within a specific position range. The minimum rotation speed or minimum output is reached at a specific position before the closed position and is substantially constant. Corresponding to different supply output levels, a linear reduction, for example, is performed along lines of different slopes, the length of the specific position range in which the reduction is performed being constant.