Secondary air control system for an internal combustion engine
US4231220A · kind A · utility
12Cited by
5References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 9, 1978 |
| Grant date | Nov 4, 1980 |
| Priority date | — |
| Expiry date | Aug 9, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Disclosed is a double feedback loop type of secondary air control system for an internal combustion engine, in which a valve provided in a secondary air feed passage for regulating a quantity of the secondary air fed into an exhaust passage of the engine is operated in response to a first error signal indicative of a deviation of the actual secondary air quantity from the desired secondary air quantity and a second error signal indicative of a deviation of the actual air-fuel ratio from the desired air-fuel ratio, thereby effecting a precise control of the air-fuel ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.