Method for detecting crankshaft oscillations

Details Method for detecting crankshaft oscillations Method for detecting crankshaft oscillations

1995-11-08

1998-05-05

Raevis, Robert

Measuring and testing

Test stand

For engine

G01N 1500

Patent

active

057476780

ABSTRACT:
A method for detecting oscillations of a crankshaft of an internal combustion engine includes determining if an engine is within a predetermined rpm range. An amplitude of a crankshaft vibration is ascertained if the engine is within the predetermined rpm range. A determination is made as to whether or not the amplitude is greater than a limit value. A frequency of the crankshaft vibration is ascertained if the amplitude is greater than the limit value. A determination is made as to whether or not the frequency is within a predetermined frequency range. An oscillation of the crankshaft is ascertained and a process for detecting combustion misfires by evaluating fluctuations in the crankshaft speed is suppressed for a predeterminable period of time, if the frequency is within the predetermined frequency range.

REFERENCES:
patent: 5287737 (1994-02-01), Osawa et al.
patent: 5311773 (1994-05-01), Bradshaw et al.
patent: 5357788 (1994-10-01), Kantschar et al.
patent: 5531108 (1996-07-01), Feldkamp et al.
Patent Abstract of Japan No. JP 51-07155 (Osama et al) Aug. 20, 1993.

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