Closed-loop temperature control for an emission control device
US6691507B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 16, 2000 |
| Grant date | Feb 17, 2004 |
| Priority date | — |
| Expiry date | Oct 16, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A system and method are provided for closed-loop monitoring of temperature within a vehicle emission control device to control air-fuel ratio (AFR) and corresponding production of exotherm to accurately maintain a desired temperature range. A temperature sensor is positioned within the emission control device to provide a direct measurement of temperature within the device. Inlet temperature can be either directly measured or estimated using a temperature model. Actual temperature within the device is estimated as a function of the inlet and measured temperatures. The estimated actual temperature is used to modify the AFR in the exhaust gases flowing through the emission control device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.