Motor-vehicle central lock system with transponder in key

US5774060A · kind A · utility

Assignee

• Kiekert AG · DE

Inventors

• Wilfried Ostermann · Essen, DE
• Fred Welskopf · Herne, DE

Key dates

• Filing date: Aug 27, 1996
• Grant date: Jun 30, 1998
• Expiry date: Aug 27, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T70/5973
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A lock system has a remote operator, a lock provided with a switch actuatable by a key part of the operator, a central controller in the vehicle connected to elements of the vehicle for actuating same, a receiver, and a transceiver. The operator is separate from the motor vehicle and has the key part, an energy source, a transmitter powered by the energy source and actuatable to transmit a main signal containing a current main code word, and a transponder substantially independent of the transmitter and of the energy source for receiving an interrogation signal and thereupon generating a callback signal containing a callback code word. When the receiver in the motor vehicle receives the transmitted code work it sends a release signal to the controller. Alternately the transceiver can, when the switch is actuated, generate the interrogation signal, receive the callback signal, and send a release signal to the controller when the callback signal corresponds to the predetermined callback code word. After exchange of the energy source or something else that causes a lose of synchronization the key part is inserted in the lock to actuate the switch to generate the interrogation signal a…