Measuring and testing – Vehicle chassis – Steering
Patent
1993-06-30
1995-07-18
Raevis, Robert
Measuring and testing
Vehicle chassis
Steering
G01M 1500
Patent
active
054331072
ABSTRACT:
A method is provided for recognizing erratic combustion in a multicylinder internal combustion engine by using a time measuring device to measure successive time periods which a crankshaft needs to rotate through predetermined angles during operating strokes of successive cylinders. The method includes determining a static component by using a calculating device to subtract a time period of the next cylinder in an ignition order from the time period of a cylinder to be examined. The static component is multiplied with a standardizing factor by using the calculating device. A dynamic component is determined by using the calculating device to subtract a time period of a next cylinder in the ignition order from a time period of a preceding cylinder in the ignition order, and a dynamic component is negated. A change component for a lack of smoothness value is formed, the lack of smoothness value is multiplied with a weighting factor to form a weighted value, and the weighted value is set equal to zero if the weighted value is negative. A sliding average is formed from the weighted value in a sliding averaging process. A lack of smoothness value is determined from addition of the static component, the dynamic component, and the sliding average. A combustion misfire is recognized if the smoothness value falls below a given limit value.
REFERENCES:
patent: 5044195 (1991-09-01), James
patent: 5088318 (1992-02-01), Osawa
patent: 5241480 (1993-08-01), Takaku et al.
"Methods of On-Board Misfire Detection", Plapp et al., SAE Technical Paper, pp. 9-20.
Angermaier Anton
Vogt Thomas
Wier Manfred
Greenberg Laurence A.
Lerner Herbert L.
Raevis Robert
Siemens Aktiengesellschaft
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