Machine start controlling apparatus

Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile

Patent

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Details

307 104, 180287, 34082531, 34082534, H04L 920

Patent

active

061441139

ABSTRACT:
An immobilizer ECU (20) compares an internally stored reference code with a key code transmitted from a key (10). An engine ECU (24) transmits a rolling code A when an engine speed reaches 500 rpm. The immobilizer ECU (20) transmits a rolling code B when the codes coincide with each other. The engine ECU (24) will stop an engine if it cannot receive the rolling code B within a prescribed period of time. Further, there is provided a counter CIMMOF which is incremented at the beginning of such a process. The counter CIMMOF is reset only when the process is normally completed. If an ignition is turned off prior to transmission and reception of the rolling codes, the counter CIMMOF will be counted up. According to a value of the counter CIMMOF, a period of waiting for the rolling code B is gradually shortened. Further, when the process is completed or a backup power supply to a backup memory (24d) is cut off, a time to transmit and receive the rolling codes is advanced. Thus, the situation where the engine will be able to start due to disconnection of a communication line or the like is prevented.

REFERENCES:
patent: 4749873 (1988-06-01), Mutoh et al.
patent: 5555863 (1996-09-01), Kokubu
patent: 5670933 (1997-09-01), Hayashi
patent: 5708308 (1998-01-01), Katayama et al.
patent: 5763958 (1998-06-01), Yamamoto et al.
patent: 5790015 (1998-08-01), Iitsuka
patent: 5796179 (1998-08-01), Honaga

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