Misfire detection device and misfire detection method of internal combustion engine
AssigneeMikuni Corporation
InventorsNorio Sato, Manabu Matsunaga
Life of this patent
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Abstract
A misfire detection device detects presence/absence of a misfire in an internal combustion engine in which respective processes of intake, compression, combustion, and exhaust are performed in a cylinder due to rotation of a crank shaft, and includes a crank position sensor that detects a crank angle signal synchronized with a rotation angle of the crank shaft, and a control unit that calculates, based on a plurality of the crank angle signals detected by the crank position sensor, a plurality of inter-signal times as reception intervals of the crank angle signals. The control unit detects presence/absence of a misfire based on each of the inter-signal times in the combustion process.
Claims10
A misfire detection device of an internal combustion engine, the misfire detection device being for detecting presence/absence of a misfire in the internal combustion engine in which respective processes of intake, compression, combustion, and exhaust are performed in a cylinder due to rotation of a crank shaft, the misfire detection device comprising:
- a crank position sensor detecting a crank angle signal synchronized with a rotation angle of the crank shaft;
- and
- a control unit calculating, based on a plurality of the crank angle signals detected by the crank position sensor, a plurality of inter-signal times as reception intervals of the crank angle signals, wherein
- the control unit detects presence/absence of the misfire based on the inter-signal times in the combustion process.
A misfire detection method of an internal combustion engine, the misfire detection method being for detecting presence/absence of a misfire in the internal combustion engine in which respective processes of intake, compression, combustion, and exhaust are performed in a cylinder due to rotation of a crank shaft, the method comprising:
- a crank angle signal detection step of detecting a crank angle signal synchronized with a rotation angle of the crank shaft;
- an inter-signal time calculation step of calculating, based on a plurality of the crank angle signals detected in the crank angle signal detection step, a plurality of inter-signal times as reception intervals of the crank angle signals;
- and
- a determination step of determining presence/absence of the misfire based on each of the inter-signal times in the combustion process calculated in the inter-signal time calculation step.
Dependencies are inferred from the claim text.