Control device for internal combustion engine
US8490610B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 26, 2009 |
| Grant date | Jul 23, 2013 |
| Priority date | — |
| Expiry date | Jul 15, 2030 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/0406
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An EG-ECU suspends fuel cutoff when the fuel cutoff is being carried out and the engine speed NE becomes lower than or equal to the resumption engine speed NErtn. The EG-ECU forcibly opens and closes an EGR valve when the fuel cutoff is being carried out, and performs abnormality diagnosis for an EGR device based on a change amount of pressure in an intake pipe caused by opening and closing the EGR valve. The EG-ECU suspends the diagnosis when the diagnosis is being carried out and the engine speed NE becomes lower than or equal to a forcible suspension engine speed NEoff. When the diagnosis is being performed, the EG-ECU sets the forcible suspension engine speed NEoff to a smaller value when the EGR valve is not in a forcibly opened state than when the EGR valve is in the forcibly opened state. Specifically, the EG-ECU sets the forcible suspension engine speed NEoff in such a manner that an allowance ΔNEallw of the forcible suspension engine speed NEoff with respect to the resumption engine speed NErtn has a smaller value when the EGR valve is not in the forcibly opened state than when the EGR valve is in the forcibly opened state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.