Inter-cylinder air-fuel ratio variation abnormality detection apparatus
US-9435279-B2 · Sep 6, 2016 · US
Inter-cylinder air-fuel ratio variation abnormality detection apparatus
US2015114376A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2015114376-A1 |
| Application number | US-201414525926-A |
| Country | US |
| Kind code | A1 |
| Filing date | Oct 28, 2014 |
| Priority date | Oct 29, 2013 |
| Publication date | Apr 30, 2015 |
| Grant date | — |
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Abstract
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An apparatus according to the present invention includes a control apparatus configured to detect inter-cylinder air-fuel ratio variation abnormality based on a parameter correlated with the degree of a fluctuation in output from the air-fuel ratio sensor. The control apparatus is configured to execute a step of identifying two cylinders estimated to have a deviation of the air-fuel ratio based on an output waveform from the air-fuel ratio sensor during one engine cycle, a step of performing reducing control to reduce the deviation of the air-fuel ratio on each of the two cylinders, that is, a first cylinder and a second cylinder, to calculate first and second values of the parameter, respectively, and a step of identifying one of the two cylinders having the most significant deviation of the air-fuel ratio based on the first and second values.
First claim
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1 . An inter-cylinder air-fuel ratio variation abnormality detection apparatus comprising: an air-fuel ratio sensor installed in an exhaust passage common to a plurality of cylinders in a multicylinder internal combustion engine; and a control apparatus configured to calculate a parameter correlated with a degree of a fluctuation in an output from the air-fuel ratio sensor to detect inter-cylinder air-fuel ratio variation abnormality based on the calculated parameter, wherein the control ap…
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- F02D41/1444Primary
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
Cross-Sectional Technologies · mapped topic
Mechanical Engineering · mapped topic
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- What does patent US2015114376A1 cover?
- An apparatus according to the present invention includes a control apparatus configured to detect inter-cylinder air-fuel ratio variation abnormality based on a parameter correlated with the degree of a fluctuation in output from the air-fuel ratio sensor. The control apparatus is configured to execute a step of identifying two cylinders estimated to have a deviation of the air-fuel ratio based…
- Who is the assignee on this patent?
- Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification F02D41/1444. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Thu Apr 30 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).