Measurement of variations in internal combustion engine output

Details Measurement of variations in internal combustion engine output Measurement of variations in internal combustion engine output

1984-05-31

1985-08-06

Kreitman, Stephen A.

Measuring and testing

Test stand

For engine

G01M 1500

Patent

active

045327980

ABSTRACT:
In a method for measuring variations in the output of an internal combustion engine, at least one of signals respectively representing an engine speed, torque, and internal cylinder pressure of the internal combustion engine during the firing strokes of the engine is obtained. A periodical and pulsating change in the obtained signal is detected. A differential value at a portion of the change of the signal having a maximum gradient is then detected. Another method provides measuring variations in the output of the internal combustion engine by calculating the difference between the maximum and minimum values of the change of the obtained signal. Still another method provides measuring variations in the output of the internal combustion engine by correcting the obtained value in accordance with the engine speed. Still another method provides measuring variations in the output of the internal combustion engine by calculating the difference between consecutive changes.

REFERENCES:
patent: 3623459 (1971-11-01), Gordon
patent: 4130095 (1978-12-01), Bowler et al.
patent: 4270503 (1979-10-01), Pomerantz
patent: 4398259 (1983-08-01), Levine
patent: 4428342 (1984-01-01), Suzuki et al.
patent: 4456963 (1984-06-01), Wiggins
patent: 4492102 (1985-01-01), Van Zanten
"Control of Exhaust Pollution Through a Mixture-Optimizer," Automotive Engineering Congress, Jan. 10-14, 1972, SAE 720254.

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