Car-mounted electronic control device

Details Car-mounted electronic control device Car-mounted electronic control device

2004-09-30

2008-03-11

Du, Thuan N. (Department: 2116)

Electrical computers and digital processing systems: support

Clock, pulse, or timing signal generation or analysis

C701S036000, C307S011000, C307S043000

Reexamination Certificate

active

07343509

ABSTRACT:
The car-mounted electronic control device is constructed to include a main control circuit unit to be powered with a car-mounted battery through a switching element and a main power source circuit, and a starting timer circuit unit powered at all times through an auxiliary power source circuit. The timer circuit unit is provided with a sub CPU for acting in synchronism with a high-speed clock signal, and a timing counter for counting the frequency-divided signal of a low-speed clock signal. When a power source switch is opened to interrupt a switching element, the timer circuit unit measures a target awakening time periodically by contrasting the period of the low-speed clock signal to the period of the high-speed clock signal.

REFERENCES:
patent: 7154194 (2006-12-01), Sayama
patent: 7155323 (2006-12-01), Ishida
patent: 2002/0002429 (2002-01-01), Sugimura et al.
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patent: 2002/0169524 (2002-11-01), Nakamoto et al.
patent: 2003/0093189 (2003-05-01), Honda
patent: 2005/0216135 (2005-09-01), Sayama et al.
patent: 4-197853 (1992-07-01), None
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patent: 11-338572 (1999-12-01), None
patent: 2003-315474 (2003-11-01), None

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