Feedback control system for gas flow in internal combustion engine for purpose of exhaust gas purification
US4185604A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1978 |
| Grant date | Jan 29, 1980 |
| Priority date | — |
| Expiry date | Mar 15, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A feedback control system for controlling the flow rate of a gas which is either drawn from or introduced into an exhaust passage of an internal combustion engine for the purpose of lessening pollutants in the exhaust gas. The control system is embodied either as an exhaust gas recirculation control system or a secondary air injection control system and in either case comprises an electrically operated flow control valve, a control circuit to provide a control signal to the control valve based on input signals representing the engine operating condition so as to establish an optimum flow rate, and an electrostatic type flow rate detector which has the ability of forming ions in the gas to provide a feedback signal on an electrical principle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.