A/D Conversion period control for internal combustion engines

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328151, 340347SH, G06F 1520, G05B 1502, H03K 1302

Patent

active

045105693

ABSTRACT:
A method and an apparatus for preventing pulsations of an A/D conversion period caused when a signal indicative of an operating condition of an internal combustion engine is subjected to the A/D conversion. The A/D conversion period is provisionally determined in accordance with the number of cylinders and speed of the engine or the number of cylinders and crank angle of the engine. Two successive A/D converted values resulting from the A/D conversion operations are compared and the next A/D conversion period is corrected in accordance with the resulting difference and the engine speed. This correcting operation is repeated to control the conversion period such that the A/D conversion is always effected at the center of the pulsations.

REFERENCES:
patent: 4208626 (1980-06-01), Gregg, Jr.
patent: 4213134 (1980-07-01), Chen
patent: 4257377 (1981-03-01), Kinugawa et al.
patent: 4280189 (1981-07-01), Takato et al.
patent: 4283713 (1981-08-01), Philipp
patent: 4424568 (1984-01-01), Nishimura et al.

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