Apparatus and method to reduce automotive emissions using filter catalyst interactive with uego
US5083427A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 12, 1990 |
| Grant date | Jan 28, 1992 |
| Priority date | — |
| Expiry date | Feb 12, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Apparatus system to control unwanted automotive emissions by use of a closed loop feedback system between an engine and catalyst, the system providing a feedback response time of less than 60 milliseconds and a resolution control for maintaining A/F ratio within .+-.0.01-0.02% of stoichiometry irrespective of random combustion effects, variations in fuel injection, variations in intake air, variations in cylinder-to-cylinder conditions, and variations in exhaust turbulence. The system has: a low mass, three-way filter catalyst stationed close to the source of the stream and effective to filter out random combustion effects within the stream; a high mass, three-way main catalyst stationed downstream of the filter catalyst and effective to convert the remainder of noxious emissions in the stream to desired levels; (c) a continuous universal exhaust gas sensor stationed in the stream between said catalyst effective to rapidly and accurately indicate the level of oxygen within the stream leaving the filter catalyst; and (d) proportional, integral control means for adjusting in a closed loop the A/F of the mixture in response to a deviation of the sensed oxygen level from stoichiometry.…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.