Method for operating a vehicle
US-2015375735-A1 · Dec 31, 2015 · US
Inter-cylinder air-fuel ratio variation abnormality detection apparatus for multicylinder internal combustion engine
US9506416B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9506416-B2 |
| Application number | US-201314095567-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 3, 2013 |
| Priority date | Dec 4, 2012 |
| Publication date | Nov 29, 2016 |
| Grant date | Nov 29, 2016 |
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Abstract
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A first parameter correlated with a degree of a variation in the output from the air-fuel ratio sensor is calculated. A possible range of a second parameter representing a degree of a variation in air-fuel ratio among the cylinders is determined based on the first parameter. The first parameter is calculated with an air-fuel ratio of a predetermined cylinder forcibly changed. A difference between the unchanged first parameter and the forcibly changed first parameter is determined. A first characteristic representing a relation between the second parameter and the difference is determined based on the possible range of the second parameter and the difference. One of the determination value and the first parameter calculated before the forced change is corrected based on inclination of the determined first characteristic.
First claim
Opening claim text (preview).
What is claimed is: 1. An inter-cylinder air-fuel ratio variation abnormality detection apparatus for a multicylinder internal combustion engine, the apparatus being configured to calculate a first parameter correlated with a degree of a variation in output from an air-fuel ratio sensor installed in an exhaust passage common to a plurality of cylinders and comparing the calculated first parameter with a predetermined determination value to detect variation abnormality in air-fuel r…
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Mechanical Engineering · mapped topic
- F02D41/1495Primary
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
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- What does patent US9506416B2 cover?
- A first parameter correlated with a degree of a variation in the output from the air-fuel ratio sensor is calculated. A possible range of a second parameter representing a degree of a variation in air-fuel ratio among the cylinders is determined based on the first parameter. The first parameter is calculated with an air-fuel ratio of a predetermined cylinder forcibly changed. A difference betwe…
- Who is the assignee on this patent?
- Suzuki Kenji, Miyamoto Hiroshi, Iwazaki Yasushi, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification F02D41/1495. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Nov 29 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).