Gaseous fuel injector

• US 5,408,967 A
• Filed: 10/22/1993
• Issued: 04/25/1995
• Est. Priority Date: 10/22/1993
• Status: Expired due to Fees

• Current Assignee: Joseph S. Foster
• Original Assignee: Joseph S. Foster
• Inventors: Foster, Joseph S.
• Primary Examiner(s): Okonsky, David A.
• Application Number:
  US08/139,669
• Time in Patent Office: 550 Days
• Field of Search: 123/27 GE, 123/526, 123/527, 123/472, 123/294
• US Class Current: 123/294
• CPC Class Codes: F02D 19/024 by controlling fuel injectors
• CPC Class Codes: F02M 21/0254 Electric actuators, e.g. solenoid or piezoelectric
• CPC Class Codes: F02M 21/0275 for in-cylinder direct injection, e.g. injector combined with spark plug
• CPC Class Codes: F02M 21/0281 Adapters, sockets or the like to mount injection valves onto engines; Fuel guiding passages between injectors and the air intake system or the combustion chamber
• CPC Class Codes: Y02T 10/30 Use of alternative fuels, e.g. biofuels

Abstract

A fuel injection system for an engine having a cylinder, a piston in the cylinder, and an inlet port at the cylinder comprising a fuel inlet passage communicating with the inlet port and adapted to be connected to a fuel source and a fuel valve movable between an open position for allowing fuel to flow in the inlet passage and a closed position preventing fuel flow. The fuel valve is biased into one of the open or closed positions and a control system permits movement of the fuel valve to the open position at timed intervals to deliver metered volumes of fuel to the engine cylinder.

Claims

1. A gaseous fuel injection system for an engine having a cylinder, a piston in the cylinder, and an inlet port at the cylinder comprising:

a fuel inlet passage communicating with the inlet port for connection to a gaseous fuel source under pressure;

fuel valve means movable between an open position for allowing fuel to flow in the inlet passage and a closed position preventing fuel flow;

biasing means comprising a sealed chamber adjacent the fuel valve means that is pressurizable to exert a force on the fuel valve means to bias the fuel valve means into the closed position; and

means for controlling the biasing means comprising second valve means to reduce pressure in the sealed chamber at timed intervals such that the pressurized gaseous fuel acts to move the fuel valve means to the open position to deliver fuel to the engine cylinder via the fuel inlet passage.

2. A fuel injection system as claimed in claim 1 in which the second valve means comprises a solenoid valve controlled a preprogrammed electronic module.

3. A fuel injection system as claimed in claim 1 in which the fuel valve means comprises a piston that is formed from a high strength, light weight plastic.