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Air-fuel ratio imbalance determining apparatus among cylinders for an internal combustion engine
US8965665B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8965665-B2 |
| Application number | US-200913389082-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 6, 2009 |
| Priority date | Aug 6, 2009 |
| Publication date | Feb 24, 2015 |
| Grant date | Feb 24, 2015 |
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Abstract
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An air-fuel ratio imbalance among cylinders determining apparatus according to the present invention obtains an output Vabyfs of an air-fuel ratio sensor disposed at a portion downstream of an exhaust gas aggregated portion of an exhaust gas passage, and obtains a second-order differential value d2AF (a change rate of a change rate of a detected air-fuel ratio abyfs) of a detected air-fuel ratio abyfs represented by the air-fuel ratio sensor output Vabyfs. The imbalance determining apparatus determines that an air-fuel ratio imbalance state among cylinders is occurring when a detected air-fuel ratio second-order differential corresponding value (for example, a second-order differential value d2AF per se) obtained in accordance with the second-order differential value d2AF is larger than a first threshold value.
First claim
Opening claim text (preview).
The invention claimed is: 1. An air-fuel ratio imbalance among cylinders determining apparatus, applied to a multi-cylinder internal combustion engine having a plurality of cylinders, for determining whether or not an air-fuel ratio imbalance state among cylinders is occurring, said state being a state in which an imbalance is occurring among individual cylinder air-fuel ratios, each of which is an air-fuel ratio of a mixture supplied to each of at least two cylinders of said plura…
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- F02D41/008Primary
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
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- What does patent US8965665B2 cover?
- An air-fuel ratio imbalance among cylinders determining apparatus according to the present invention obtains an output Vabyfs of an air-fuel ratio sensor disposed at a portion downstream of an exhaust gas aggregated portion of an exhaust gas passage, and obtains a second-order differential value d2AF (a change rate of a change rate of a detected air-fuel ratio abyfs) of a detected air-fuel rati…
- Who is the assignee on this patent?
- Iwazaki Yasushi, Miyamoto Hiroshi, Nakamura Fumihiko, and 3 more
- What technology area does this patent fall under?
- Primary CPC classification F02D41/008. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Feb 24 2015 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).