Internal combustion engine controller
US5216991A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1992 |
| Grant date | Jun 8, 1993 |
| Priority date | — |
| Expiry date | Aug 31, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/0042
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An internal combustion engine in which a purge control valve is provided in a fuel vapor supply passage connecting a canister and an intake pipe of the internal combustion engine, the opening degree of the purge control valve is regulated by a purge flow rate control unit depending on operating condition of the internal combustion engine, and the opening degree of a rotational speed control valve is regulated to adjust an amount of intake air into the internal combustion engine, thereby changing a rotational speed of the internal combustion engine. While the internal combustion engine is idling in such a condition that the air/fuel ratio of a gas mixture supplied to the internal combustion engine is controlled to be held constant and the opening degree of the rotational speed control valve is regulated so that the rotational speed of the internal combustion engine reaches a target value, a controller operates to forcibly change the opening degree of the purge control valve from a first set opening degree to a second set opening degree, and determine the presence or absence of an abnormality in supply of fuel vapor to the intake pipe of the internal combustion engine through the sup…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.