Motor-vehicle door lock

US6407520B1 · kind B1 · utility

Assignee

• Kiekert AG · DE

Inventors

• Frank Kleefeldt · Heiligenhaus, DE
• Fred Welskopf · Herne, DE

Key dates

• Filing date: Oct 25, 2000
• Grant date: Jun 18, 2002
• Expiry date: Oct 25, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S388/904
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

A motor-vehicle door latch to avoid unnecessary sound emission, has its motor operated with pulse-width modulation so that, once a blockade time point is reached or prior thereto, the motor is energized with reduced power so that it generates a ramp characteristic running to a minimum. The torque and/or speed are thereby reduced along the ramp characteristic correspondingly.