Apparatus and method for averting the effects of seal failure in an I.C. engine fuel supply system
US4187817A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 1978 |
| Grant date | Feb 12, 1980 |
| Priority date | — |
| Expiry date | Oct 5, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/5762
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An air fuel ratio control for an I.C. engine fuel supply system is disclosed including a diaphragm operator for a fuel flow modulating valve responsive to engine intake manifold pressure as sensed through an air line connecting the diaphragm operator with the intake manifold and a drain line for returning to the engine fuel tank all fuel which may leak into the diaphragm operator due to seal rupture. The disclosed system further including a specially designed flow restrictor in the air line to prevent engine fuel tank pressurization and reverse fuel flow into the engine's intake manifold should the diaphragm operator rupture. The flow restrictor includes a control orifice which is sufficiently large to allow proper control by the diaphragm operator but yet not so large as to allow fuel tank pressurization should the diaphram rupture. In one embodiment the flow restrictor includes a check valve designed to close only upon improper fuel flow from the air fuel control to the intake manifold. To avoid manufacturing tolerances, the check valve may be calibrated to close at precisely the proper miminal flow rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.