Feedback air-fuel ratio regulator
US3998189A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 20, 1975 |
| Grant date | Dec 21, 1976 |
| Priority date | — |
| Expiry date | Oct 20, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1482
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A feedback air-fuel ratio regulator comprises an air-fuel ratio sensor which determines air-fuel ratio of the combustible gas from the composition of its exhaust gas and produces a sudden change in its output at a preset theoretical air-fuel ratio and an electronic air-fuel ratio controlling circuit. The latter includes voltage detectors for detecting the output voltage of the air-fuel ratio sensor at two or more points corresponding to certain richer and leaner air-fuel ratios than the theoretical one. Switching means are actuated by the output combined by the voltage detectors. An integrating circuits has a time constant which is determined by a condenser and resistance selected by the switching means, whereby the amount of fuel to be injected is regulated by the time constant which is determined by the output of integrating circuit according to said output voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.