Electronic control unit having hold circuit and method therefor

Details Electronic control unit having hold circuit and method therefor Electronic control unit having hold circuit and method therefor

2006-10-17

2006-10-17

Zanelli, Michael J. (Department: 3661)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Vehicle subsystem or accessory control

Reexamination Certificate

active

07124005

ABSTRACT:
When a microcomputer is automatically reset due to uncontrollable process and recovers from reset, a cancel pulse signal is outputted from the microcomputer to a hold circuit to stop supply of a driving current to a relay. This pulse is generated, when a predetermined condition indicative of possibility of battery rundown lasts for a predetermined time. The predetermined condition includes that a hold set condition is detected based on a status signal inputted from the hold circuit; a card key is present in a key slot; a key verification inputted from an immobilizer ECU is not available; a vehicle speed is zero; and an engine revolution is zero.

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patent: A-4-195243 (1992-07-01), None

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