Apparatus and method for determining a time that a system's main

Details Apparatus and method for determining a time that a system's main Apparatus and method for determining a time that a system's main

1994-05-02

1995-04-25

Wambach, Margaret R.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Identifying or correcting improper counter operation

377 16, 327 1, H03K 2140

Patent

active

054105811

ABSTRACT:
An apparatus and method for determining a time that a system's main power was inactive includes a counter circuit (171) for accumulating transitions of a clock signal (149) while the system's main power (117) is inactive. Preferably, another circuit (159, 125) determines a periodicity of the clock signal (149) after the system's main power (117) transitions active. Then a computational circuit, preferably a microcontroller (129), determines the time (183) that the system's main power (117) was inactive dependent on a number of transitions of the clock signal (149) accumulated by the counter circuit (171) when the system's main power (119) was inactive and the determined periodicity of the clock signal (149) after the system's main power (117) transitions active. Preferably, this apparatus and method are used in a vehicle to determine how long a time that an engine is turned off and to modify an engine control strategy dependent on that determined time.

REFERENCES:
patent: 4584651 (1986-04-01), Carey, Jr. et al.
IBM Tech Disc. Bul. "Self-clearing status register" vol. 30, No. 6, Nov. 1987.

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