Control device for internal combustion engine
US-2015267625-A1 · Sep 24, 2015 · US
Control apparatus for internal combustion engine
US10526980B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10526980-B2 |
| Application number | US-201715659837-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 26, 2017 |
| Priority date | Jul 28, 2016 |
| Publication date | Jan 7, 2020 |
| Grant date | Jan 7, 2020 |
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Abstract
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To improve accuracy in misfire determination, a control apparatus for an internal combustion engine that controls an internal combustion engine having a variable compression ratio mechanism capable of changing the compression ratio of the internal combustion engine includes a controller configured to: determine that a misfire occurs if the magnitude of rotational fluctuation of the internal combustion engine is equal to or larger than a misfire criterion value and to make the misfire criterion value larger during the time in which changing of the compression ratio of the internal combustion engine is in progress than during the time in which the compression ratio is not being changed.
First claim
Opening claim text (preview).
The invention claimed is: 1. A control apparatus for an internal combustion engine that controls an internal combustion engine having a variable compression ratio mechanism capable of changing the compression ratio of the internal combustion engine, comprising: a controller configured to: determine that a misfire occurs if the magnitude of rotational fluctuation of the internal combustion engine is equal to or larger than a misfire criterion value; and when changing the compression ratio of the internal combustion engine from the compression ratio at a change end time, making said misfire criterion value larger during the time period from the change start time to the change end time than before the change start time and after the change end time. 2. A control apparatus for an internal combustion engine that controls an internal combustion engine having a variable compression ratio mechanism capable of changing the compression ratio of the internal combustion engine, comprising: a controller configured to: determine that a misfire occurs in a misfire determination target cylinder if a magnitude of rotational fluctuation is equal to or larger than a misfire criterion value, the magnitude of rotational fluctuation being the difference between a misfire correlative value with the misfire determination target cylinder defined as a cylinder for which misfire determination is performed and the misfire correlative value with a specific cylinder Nth (N is a specific number) preceding said misfire determination target cylinder in firing order, the misfire correlative value being a value that correlates with the rotational speed of the internal combustion engine in the compression stroke of a cylinder and becomes larger when a misfire occurs in that cylinder than when a misfire does not occur in that cylinder; and make said misfire criterion value for said misfire determination target cylinder larger, if the compression ratio of said misfire determination target cylinder is lower than the compression ratio of said specific cylinder during the time in which changing of the compression ratio of the internal combustion engine is in progress, than that during the time in which the compression ratio is not being changed. 3. A control apparatus for an internal combustion engine according to claim 2 , wherein said controller further configured to make said misfire criterion value for said misfire determination target cylinder smaller, when the compression ratio of said misfire determination target cylinder is higher than the compression ratio of said specific cylinder during the time in which changing of the compression ratio of the internal combustion engine is in progress, than that during the time in which the compression ratio is not being changed.
Assignees
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Classifications
Engines misfires · CPC title
- F02D15/02Primary
by alteration or displacement of piston stroke · CPC title
Control of the engine output torque · CPC title
of combustion-air · CPC title
by detecting misfire · CPC title
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Frequently asked questions
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- What does patent US10526980B2 cover?
- To improve accuracy in misfire determination, a control apparatus for an internal combustion engine that controls an internal combustion engine having a variable compression ratio mechanism capable of changing the compression ratio of the internal combustion engine includes a controller configured to: determine that a misfire occurs if the magnitude of rotational fluctuation of the internal com…
- Who is the assignee on this patent?
- Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification F02D15/02. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Jan 07 2020 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).