Fuel metering system
US5448882A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1993 |
| Grant date | Sep 12, 1995 |
| Priority date | — |
| Expiry date | Dec 14, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02C9/263
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel control system independently meters fuel flow to a first and a second set of pilot fuel nozzles, and to a set of main fuel nozzles. A pilot coaxial metering and pressure regulating valve is coupled between a primary fuel inlet line and the first and second sets of pilot nozzles, and a main coaxial metering and pressure regulating valve is coupled between the primary fuel inlet line and the set of main fuel nozzles. Each coaxial metering and pressure regulating valve maintains a substantially constant pressure drop across the respective valve, and includes a metering window. The size of each metering window is controlled by an engine electronic control unit based on the signals transmitted by a respective LVDT, in order to precisely meter the fuel flow through the valve and to the respective sets of fuel nozzles. A control pressure regulating valve maintains a minimum pressure differential between the fuel inlet line and the downstream sides of the coaxial metering and pressure regulating valves, in order to provide sufficient pressure to operate the valves, and directs excess fuel from the fuel pump into a return line. A minimum pressure and shut-off valve is coupled between…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.