Diesel engine exhaust gas purification method and exhaust gas purification system
US-9222394-B2 · Dec 29, 2015 · US
Control device for internal combustion engine having an external exhaust gas recirculation system
US9020739B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9020739-B2 |
| Application number | US-99993509-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 11, 2009 |
| Priority date | Nov 11, 2009 |
| Publication date | Apr 28, 2015 |
| Grant date | Apr 28, 2015 |
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Abstract
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Disclosed is a control device for an internal combustion engine that is used with an internal combustion engine having an EGR catalyst and an EGR valve in an EGR path for connecting an exhaust path to an intake path, and capable of preventing the purification performance of the EGR catalyst from being degraded during EGR stoppage and purifying exhaust gas in a preferred manner upon EGR resumption. When EGR is stopped with the EGR valve closed, the control device judges whether an EGR path air-fuel ratio is richer than a threshold value. If the EGR path air-fuel ratio is judged to be richer than the threshold value, the control device sets a target air-fuel ratio for the internal combustion engine to be leaner than a stoichiometric air-fuel ratio.
First claim
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The invention claimed is: 1. A control device for an internal combustion engine, comprising: an Exhaust Gas Recirculation (EGR) path that connects an exhaust path and an intake path of the internal combustion engine; an EGR catalyst that is disposed in the EGR path and capable of purifying exhaust gas; an EGR valve that opens and closes the EGR path, the EGR valve being disposed downstream of the EGR catalyst in the EGR path; an EGR path oxygen sensor that acquires an exhaus…
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Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
Mechanical Engineering · mapped topic
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Frequently asked questions
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- What does patent US9020739B2 cover?
- Disclosed is a control device for an internal combustion engine that is used with an internal combustion engine having an EGR catalyst and an EGR valve in an EGR path for connecting an exhaust path to an intake path, and capable of preventing the purification performance of the EGR catalyst from being degraded during EGR stoppage and purifying exhaust gas in a preferred manner upon EGR resumpti…
- Who is the assignee on this patent?
- Inoue Masahiro, Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification F02D41/0052. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Apr 28 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).