Internal combustion engine exhaust gas monitoring system
US4194471A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 28, 1978 |
| Grant date | Mar 25, 1980 |
| Priority date | — |
| Expiry date | Feb 28, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1456
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
To detect substantial deviation of operation of the engine with fuel-air mixtures from stoichiometric relationships, particularly extended operation under very lean or enriched supply mixtures, the exhaust gases are conducted past a first sensor which provides a clearly defined voltage jump upon change of the exhaust gases between reducing and oxidizing state; and, additionally, to a second exhaust gas sensor and preferably to a third sensor, the second and third sensors being, respectively, responsive to the oxygen level in the exhaust gases and to the CO (or hydrocarbon) level in the exhaust gases, respectively, and additionally modifying the relative proportion of fuel and air of the mixture being fed to the engine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.