Exhaust gas purifying apparatus for multicylinder internal combustion engines
US4240254A · kind A · utility
6Cited by
5References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1978 |
| Grant date | Dec 23, 1980 |
| Priority date | — |
| Expiry date | Apr 7, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
An exhaust gas purifying apparatus having an exhaust pipe divided into at least two branches each connected to a different cylinder or cylinders. Each of the exhaust pipe branches is further connected to a secondary air supply tube to intermittently supply secondary air upstream of a three-way catalyst disposed in the branch thereby to vary periodically within a range the air-fuel ratio of exahust gases flowing into the three-way catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.