Dual fuel carburetion system and method
US4574763A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1982 |
| Grant date | Mar 11, 1986 |
| Priority date | — |
| Expiry date | Oct 27, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/30
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A dual fuel system for use with internal combustion engines comprising (a) a manually actuated dual fuel valve, (b) a liquified gas to gaseous fuel converter combining a liquified fuel lock-off valve responsive to engine vacuum and a fuel metering valve responsive to a predetermined positive pressure modulated by engine vacuum, and (c) a positive pressure gaseous fuel and air mixer having a compact plunger structure in which the fuel valve is located within the air valve structure. In one embodiment, the mixer employs a relatively large piston which travels a relatively short distance to meter the flow of air between the lower surface of the piston and a coaxial annular surface. A second embodiment of the mixer utilizes a smaller diameter piston which travels a relatively longer distance, but which utilizes a relatively flat plunger to meter air flow. The fuel valve carried by the plunger structure may be of the needle valve or slotted tube type and may serve as a guide for the air valve structure. Separate air and fuel controls are provided for engine idle, and a portion of the fuel valve structure is replaceable to accommodate gaseous fuels with different physical properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.