Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile
Patent
1995-11-07
1997-04-01
Wysocki, Jonathan
Electrical transmission or interconnection systems
Vehicle mounted systems
Automobile
307 103, 307 104, 180 287, 70DIG46, 340426, E05B 4700
Patent
active
056169663
ABSTRACT:
An anti-theft system for a motor vehicle includes a portable transponder carrying code information. A stationary transceiver has an oscillator and an oscillating circuit being excited to oscillate by the oscillator at an oscillation being modulated by the transponder in synchronism with the code information. A demodulator demodulates the modulated oscillation of the oscillating circuit. According to one embodiment, the code information is obtained from the demodulated oscillation by sampling the oscillation at least at one predetermined sampling time. An arithmetic unit compares the code information with command code information and transmits an enable signal to a security unit if a match occurs. The modulated oscillation being shifted by a predetermined phase angle is sampled once again if initially no code information is recognized from the demodulator. According to another embodiment, the modulated oscillation containing the code information is sampled at least at two predetermined times being phase-shifted from one another by a predetermined phase angle and the code information is obtained from voltage values detected at the sampling times. The arithmetic unit compares the code information with the command code information and transmits an enable signal to a security unit if a match occurs.
REFERENCES:
patent: 4738334 (1988-04-01), Weishaupt
patent: 4918955 (1990-04-01), Kimura et al.
patent: 5117097 (1992-05-01), Kimura
patent: 5280267 (1994-01-01), Reggiani
patent: 5307658 (1994-05-01), Kokubu
patent: 5552789 (1996-09-01), Schuermann
Fischer Armin
Glehr Manfred
Haimerl Stefan
Ganjoo Peter
Greenberg Laurence A.
Lerner Herbert L.
Siemens Aktiengesellschaft
Wysocki Jonathan
LandOfFree
Anti-theft system for a motor vehicle does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Anti-theft system for a motor vehicle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Anti-theft system for a motor vehicle will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-541834