Manifold referenced returnless fuel system
US5398655A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 21, 1994 |
| Grant date | Mar 21, 1995 |
| Priority date | — |
| Expiry date | Jun 21, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M2200/24
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel pressure regulator for a no-return fuel system for an automotive engine with fuel injectors having a housing with a flexible diaphragm between first and second chambers. The second chamber has a fuel inlet receiving fuel from a fuel pump with a spring biased valve therein to admit fuel to the second chamber and an outlet to supply fuel to the engine. The second chamber is in continuous communication with the engine to accumulate any fuel expansion that may occur during engine deceleration or when the engine is turned off due to heating the fuel. The first chamber continuously communicates with the engine air intake manifold so that fuel is supplied to the engine fuel injectors at a substantially constant pressure drop across the injectors. An over-pressure relief by-pass valve responsive to pressure at said fuel inlet will by-pass fuel to a reservoir when pressure in said second chamber opens said spring biased valve. A switch in said by-pass valve acts through a pulse width modulator to reflect the over-pressure to the pump drive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.