Communications: electrical – Land vehicle alarms or indicators – Of burglary or unauthorized use
Patent
1995-05-09
1996-05-21
Swarthout, Brent A.
Communications: electrical
Land vehicle alarms or indicators
Of burglary or unauthorized use
340428, 307 102, 307 103, 307 106, 180287, B60R 2510
Patent
active
055193765
ABSTRACT:
An antitheft apparatus for an automotive vehicle comprises: a transponder (1) buried in an ignition key to store an ID number thereof; a receive unit (2) to receive the ID number of the ignition key inserted into the ignition key cylinder; an immobilizer unit (3) for outputting an engine start enable signal when the received ID number matches one of the stored ID numbers and not outputting the engine start enable signal when does not match; and an engine control unit (5) for enabling an engine drive in response to the reception of the engine start enable signal but disabling the engine drive in response to no reception of the engine start enable signal. In particular, the engine drive unit (5) keeps the immobilizer unit (3) inoperative for a predetermined time duration when the engine cranking operation is detected and allows the immobilizer unit (3) to be operative after the predetermined time has elapsed. Therefore, even if the cranking voltage is intentionally applied to disable the antitheft apparatus, since the antitheft apparatus can be restored after a predetermined time has elapsed and thereby the ID collation can be executed, it is possible to stop the engine from being started by use of a non-registered ignition key or stop the already driven engine, securely.
REFERENCES:
patent: 4835407 (1989-05-01), Kataoka et al.
patent: 4965460 (1990-10-01), Tanaka et al.
patent: 5079435 (1992-01-01), Tanaka
patent: 5254842 (1993-10-01), Posner et al.
patent: 5337588 (1994-08-01), Chhatwal
Nissan Motor Co,. Ltd.
Swarthout Brent A.
Tong Nina
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