Method and apparatus for fuel/air mixture adjustment
US4178883A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 25, 1978 |
| Grant date | Dec 18, 1979 |
| Priority date | — |
| Expiry date | Jan 25, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1474
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for adjusting the reference or set-point value which is used in a closed-loop fuel control system for comparison with the actual value signal from an exhaust gas analyzer or sensor. The frequency of amplitude alternations of the sensor signal is a measure of engine speed and gas throughput rate. Accordingly, the invention provides generation of a quasi-D.C. signal whose amplitude is related to the frequency of sensor signal alternations. This signal is then used to change the supply voltage for a voltage-dividing circuit that supplies the reference voltage to the comparator circuit. The invention describes continuous and discrete adjustments of the reference signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.