Electronic control unit and signal monitoring circuit

Details Electronic control unit and signal monitoring circuit Electronic control unit and signal monitoring circuit

2008-09-10

2011-11-08

Connolly, Mark (Department: 2115)

Electrical computers and digital processing systems: support

Computer power control

Power conservation

C713S300000

Reexamination Certificate

active

08055923

ABSTRACT:
An electronic control unit has a microcomputer and a signal monitoring circuit. When a brake pedal is pressed down and an analog signal from a brake pedal sensor is changed in a low power consumption operation mode of the microcomputer, the signal monitoring circuit operates cyclically. When the signal monitoring circuit starts the operation, a capacitor is charged with a constant current for only a charging time stored in a memory. When a comparator detects that the analog signal is lower than the charge voltage of the capacitor, a wakeup signal is output from the comparator to the microcomputer to cause the microcomputer to operate in the normal operation mode. The charging time is pre-stored in a memory of the microcomputer.

REFERENCES:
patent: 7132944 (2006-11-01), Kron et al.
patent: 2004/0215990 (2004-10-01), Allen et al.
patent: 8-320741 (1996-12-01), None
patent: 2004-234463 (2004-08-01), None

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