Engine control to reduce emissions variability
US6581571B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 2001 |
| Grant date | Jun 24, 2003 |
| Priority date | — |
| Expiry date | Sep 15, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A system and method of controlling an engine includes sensing a concentration of NOx in exhaust gases produced by the engine and generating a sensed NOx value representative thereof, and controlling an engine control set point as a function of the sensed NOx value. The system also calculates a NOx difference value by subtracting a base NOx value from the sensed NOx value, and if an absolute value of the difference value exceeds a threshold, modifying the set point as a function of the NOx difference value. The method also includes sensing engine RPM, sensing engine manifold absolute pressure (MAP), determining the NOx value as a function of sensed engine RPM and MAP.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.