Anti-theft system for vehicles

Details Anti-theft system for vehicles Anti-theft system for vehicles

1998-10-23

2000-10-10

Pope, Daryl

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

3408253, 34082531, 34082532, 307 102, 307 105, B60R 2510

Patent

active

061306045

ABSTRACT:
To prevent the engine from becoming able to be started by a cut-off of the communication line, for example, an engine control ECU 20 contains a reference code which is used to compare with a personal ID code transmitted from a transponder 12 of a key 10. A key insertion detecting switch 22 start this comparison when the insertion of the key is detected, and finishes the comparison before the engine is started. When a trouble of the key insertion detecting switch 22 is detected, a code collating section 20b collates the ID code with a reference code until the number of revolutions of the engine 30 exceeds 500 rpm. Therefore, even when the key insertion detecting switch 22 becomes out of order, it is possible to recognize the operation with a correct key, and give a permission to start the engine 30.

REFERENCES:
patent: 5684454 (1997-11-01), Nishioka et al.
patent: 5703414 (1997-12-01), Mutoh et al.
patent: 5708307 (1998-01-01), Iijima et al.
Automobile Technology Case Study, Issue No. 95603, Dec. 1, 1995, Japan Automobile Manufacturers Association, Intellectual Property Council.

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