Secondary air supply system for the exhaust system of an internal combustion engine
US4269028A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 4, 1978 |
| Grant date | May 26, 1981 |
| Priority date | — |
| Expiry date | Apr 4, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N3/227
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A secondary air supply system for the exhaust system of an internal combustion engine having a catalytic converter with a three-way catalyst, having an air control valve which selectively supplies a part of compressed air to the exhaust system while relieving the rest of the air to the atmosphere, wherein the air control valve has a valve element balanced by oppositely acting springs to a neutral position where it supplies a predetermined amount of secondary air necessary to provide stoichiometric exhaust gases at a standard flow of exhaust gases and is shifted to opposite sides of the neutral position in accordance with oscillation of feedback control of the air/fuel ratio of exhaust gases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.