Exhaust gas purifying apparatus for internal combustion engine
US8051641B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 13, 2006 |
| Grant date | Nov 8, 2011 |
| Priority date | — |
| Expiry date | Feb 26, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention has an object to provide an exhaust gas purifying apparatus for an internal combustion engine capable of obtaining accurate temperature information relating to a catalyst placed in an exhaust passage of the internal combustion engine. The degree of influence emthc of a catalyst inlet gas temperature and catalyst rear end temperature ethuf[end] is calculated (Step 102). An estimated value ethco of an outlet gas temperature is calculated by weighted averaging the inlet gas temperature and the catalyst rear end temperature ethuf[end] considering the degree of influence emthc (Step 104). A temperature correction coefficient ekthuf[x] for each region of the catalyst is calculated as a function f(emthc) of the degree of influence emthc (Step 108). A deviation between the outlet gas temperature estimated value ethco and a measured value of the outlet gas temperature is multiplied by the temperature correction coefficient ekthuf[x] to calculate an estimated value correction amount ecthuf[x] (Step 110). The estimated value correction amount ecthuf[x] is added to a catalyst temperature estimated value (Step 114).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.