Internal-combustion engines – Two-cycle – Rear compression
Reexamination Certificate
2000-02-14
2001-09-25
Kwon, John (Department: 3747)
Internal-combustion engines
Two-cycle
Rear compression
C123S0650PD
Reexamination Certificate
active
06293235
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to fuel injection systems for internal combustion engines and, more specifically, to the control of a low pressure injection in an internal combustion engine. A particular field of application of the invention is a two-stroke internal combustion engine. The specific application described is to a small high speed two-stroke engine, such as utilized in handheld power equipment such as leaf blowers, string trimmers and hedge trimmers, also in wheeled vehicle applications such as mopeds, motorcycles and scooters and in small outboard boat engines. The small two-stroke engine has many desirable characteristics, that lend themselves to the above applications, including: simplicity of construction, low cost of manufacturing, high power-to-weight ratios, high speed operational capability and, in many parts of the world, ease of maintenance with simple facilities.
The prominent drawback of the simple two-stroke engine is the loss of a portion of the fresh unburned fuel charge from the cylinder during the scavenging process. This leads to poor fuel economy and, most importantly, high emission of unburned hydrocarbon, thus rendering the simple two-stroke engine incapable of compliance with increasingly stringent governmental pollution restrictions. This drawback can be relieved by separating the scavenging of the cylinder, with fresh air, from the charging of the cylinder, with fuel. This separation can be achieved by injecting the liquid fuel into the cylinder or more preferably by injecting the fuel charge by utilizing a pressurized air source, separate from the fresh air scavenge, to spray the fuel into the cylinder. In a preferred embodiment of the present invention, the displacement size of the engine is about 16 cc to about 100 cc, but could be larger or smaller. These sizes of engines are used for such things as string trimmers, chain saws, leaf blowers, and other hand held power tools. The engine could also be used on a tool such as a lawn mower, snow blower or motor boat outboard engine.
SUMMARY OF THE INVENTION
In accordance with one embodiment of the present invention, an internal combustion engine is provided having a combustion chamber and a fuel delivery system for delivering fuel into the combustion chamber. The fuel delivery system includes a fuel entry proximate the combustion chamber and a combustion compression wave reflection conduit connected to the combustion chamber proximate the fuel entry. The reflection conduit comprises a variable effective reflection length.
In accordance with another embodiment of the present invention, an internal combustion engine fuel delivery assist is provided comprising a combustion compression wave reflector; and a control system connected to the reflector for at least partially controlling the reflector to vary timing of delivery of a reflected combustion compression wave to a predetermined location of an engine.
In accordance with another embodiment of the present invention, an internal combustion engine is provided having a combustion chamber and a fuel delivery system for delivering fuel into the combustion chamber. The fuel delivery system includes a fuel entry proximate the combustion chamber and a combustion compression wave reflector connected to the combustion chamber. The reflector is variable based upon at least one engine operating parameter of the engine.
In accordance with another embodiment of the present invention, an internal combustion engine fuel delivery assist system is provided comprising a variable combustion compression wave reflector comprising a reflection conduit; and a control system for selectively actuating and deactuating effective combustion compression wave reflection by the reflector.
In accordance with another embodiment of the present invention, an internal combustion engine fuel delivery system for an engine is provided comprising a fuel injector; a combustion compression wave reflection system, the fuel injector having a fuel exit into a conduit of the reflection system; and a controller connected to the fuel injector. The controller is adapted to operate the fuel injector in a first mode when the reflection system comprises a reflected combustion compression wave and in a second different mode when the reflection system does not comprise a reflected combustion compression wave.
In accordance with one method of the present invention, a method of delivering pressure pulses in an internal combustion engine is provided. The method comprising steps of producing a combustion compression wave from combustion in a combustion chamber of the engine; conduiting at least a portion of the wave in a reflection pipe conduit connected to the combustion chamber; reflecting the wave portion in the conduit back towards the combustion chamber; and varying timing of delivery of the reflected wave portion back to the combustion chamber.
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Le Moteur A Deux-Temps, A Injection Electroniqu
Design & Manufacturing Solutions, Inc.
Harrington & Smith ,LLP
Kwon John
LandOfFree
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