Exhaust gas purification apparatus
US4484441A · kind A · utility
5Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1983 |
| Grant date | Nov 27, 1984 |
| Priority date | — |
| Expiry date | Jul 1, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
An improvement in an exhaust gas purification apparatus wherein a detector senses the operation of a device for injecting additional intake air into the intake passage and triggers a timing unit. The timing unit produces a signal for a predetermined amount of time which holds open a control valve for introducing secondary air into the exhaust passage ahead of the catalytic converter. This structure enables the reduction of harmful components of the exhaust gas produced during a gear-change operation of the engine without greatly overheating the catalytic converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.