Triggering circuit for a passenger restraint system

US5868427A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Manfred Mueller · Eindhoven, NL
• Harald Rudolf · Lörrach, DE
• Michael Meyer · Altdorf, DE
• Frank Zerrweck · Stuttgart, DE

Key dates

• Filing date: Jun 23, 1997
• Grant date: Feb 9, 1999
• Expiry date: Jun 23, 2017

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60R21/0132
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A triggering circuit for a passenger restraint system for motor vehicles is provided with at lest one belt tightener for tightening a safety belt associated with a vehicle seat. A triggering circuit evaluates the acceleration signal from an accelerometer and delivers a triggering signal to the belt tightener when a critical impact is detected. An evaluation channel detects a rear-end collision. In the evaluation channel, on the basis of the acceleration signal that appears in the event of a rear-end collision, a travel signal that characterizes backward displacement of the passenger is determined that permits the triggering signal to be output to the belt tightener when a threshold value is exceeded.