Smoldering determination method of internal combustion engine
US7451640B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 3, 2005 |
| Grant date | Nov 18, 2008 |
| Priority date | — |
| Expiry date | Nov 11, 2025 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P2017/125
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
According to the present invention, in a spark ignition-type internal combustion engine which has a spark plug and mounted in a vehicle, an ion current generated in a combustion chamber through the spark plug after ignition is detected and smoldering of the spark plug is determined on the basis of the detected ion current. An operation state of the internal combustion engine is detected and smoldering of the spark plug is determined based on that the detected ion current satisfies a predetermined condition when the detected operation state falls within an operation determination range set corresponding to an operation range in which an intake port pressure close to an atmospheric pressure is achieved using predetermined engine speed as an upper limit and a predetermined intake port pressure as a lower limit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.