Method for detecting cyclical combustion fluctuations in an inte

Details Method for detecting cyclical combustion fluctuations in an inte Method for detecting cyclical combustion fluctuations in an inte

1998-06-22

2000-07-04

McCall, Eric S.

Measuring and testing

Vehicle chassis

Steering

73115, G01M 1500, G01L 326

Patent

active

060821884

ABSTRACT:
Nonconcentricity or lack of smoothness values are proportional to the change in angular speed of the crankshaft. Deviation values that are proportional to the cyclical combustion fluctuations are ascertained, after the nonconcentricity values of successive combustion cycles are averaged, by comparison of the current nonconcentricity value with the associated mean value. Then the deviation quantity is compared with an individual-cylinder-specific limit value, and cyclical combustion fluctuations are deduced if the deviation quantity exceeds a limit value.

REFERENCES:
patent: 5041980 (1991-08-01), Maddock et al.
patent: 5433107 (1995-07-01), Angermaier et al.
patent: 5446664 (1995-08-01), Vossen et al.
patent: 5574217 (1996-11-01), McCombie

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