Engine control circuit

Details Engine control circuit Engine control circuit

2007-02-20

2007-02-20

Dolinar, Andrew M. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

Reexamination Certificate

active

11151430

ABSTRACT:
An engine control circuit includes a battery voltage detector, a signal supervisor, and a processor that operates in a normal mode and a power-down mode. The battery voltage detector senses the output voltage of a battery that supplies current to the engine, and asserts a detection signal when the voltage is below a predetermined value. The signal supervisor measures the length of time for which the detection signal remains asserted. The processor switches from the normal mode to the power-down mode when the measured length of time reaches a predetermined value. This scheme avoids loss of engine control when the battery voltage drops briefly and then recovers.

REFERENCES:
patent: 5095438 (1992-03-01), Sasaki
patent: 6999867 (2006-02-01), Konno
patent: 62-258154 (1987-11-01), None
patent: 07-042888 (1995-05-01), None
patent: 07-114401 (1995-05-01), None

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