Engine combustion state detection device
First Claim
1. A combustion state detection device for an internal combustion engine, comprising:
- a rotation speed detection means for producing a rotation speed signal varying with a rotation speed of a crankshaft of an internal combustion engine, the rotation speed signal containing a first frequency component synchronized with combustion cycles of the internal combustion engine and a second frequency component which is higher in frequency than the first frequency component;
an extracting means for extracting the second frequency component; and
a state detecting means for detecting a combustion state of the internal combustion engine on the basis of the extracted second frequency component.
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Abstract
A rotation angle sensor detects the rotation speed of a crankshaft of an engine. An ECU extracts a first frequency component synchronized with combustion cycles of the engine that is contained in a rotation speed signal obtained by the detection of the rotation angle sensor, and a second frequency component having a higher frequency than the first frequency component. It detects a combustion state by using the rotation variation amount of the first frequency component in a lower rotation range than a specified engine speed, and by using the rotation variation amount of the second frequency component in a higher rotation range.
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Citations
13 Claims
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1. A combustion state detection device for an internal combustion engine, comprising:
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a rotation speed detection means for producing a rotation speed signal varying with a rotation speed of a crankshaft of an internal combustion engine, the rotation speed signal containing a first frequency component synchronized with combustion cycles of the internal combustion engine and a second frequency component which is higher in frequency than the first frequency component;
an extracting means for extracting the second frequency component; and
a state detecting means for detecting a combustion state of the internal combustion engine on the basis of the extracted second frequency component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification