Antitheft apparatus and method for an automobile
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 23, 1997
Grant Date -
N/A
app pub date -
Jun 21, 1995
filing date -
Jul 14, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
If agreement between an identification code transmitted from a transmitter 111 installed in a door key 11 and a predetermined identification code is detected in an immobilizing ECU 12, a variable code including a predetermined key word is transmitted from the immobilizing ECU 12 to an engine ECU 13, and the variable code is decoded in the engine ECU 13. If the decoded key word does not agree with the predetermined key word, the starting of the engine is inhibited. According to another aspect of this invention, a variable code is transmitted from the engine ECU 13 to the immobilizing ECU 12, a returning variable code is calculated based on a predetermined key function in the immobilizing ECU 12, and it returns to the engine ECU 13. If an agreement with returned variable code and a reference variable code determined in the engine ECU 13 is detected for the predetermined period, the starting of the engine is inhibited.
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