Power plants – Internal combustion engine with treatment or handling of...
Reexamination Certificate
1999-08-06
2001-04-17
Denion, Thomas (Department: 3748)
Power plants
Internal combustion engine with treatment or handling of...
C060S298000, C060S299000
Reexamination Certificate
active
06216447
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a two cycle or two stroke engine. The present invention also relates to a method of cleaning the exhaust gases emitted from a two-stroke engine.
2. Background Information
Two cycle or two stroke carbureted gasoline engines release an amount of non-combusted fuel through their exhaust pipe. The amount of non-combusted fuel thus emitted will depend on the engine speed. The exhaust system is normally adapted to generate a back pressure to counteract this emission, although the back pressure will only function effectively at a given engine speed. The amount of non-combusted fuel emitted through the exhaust system will thus vary with varying engine speeds. When fitting a conventional reactor burner in the exhaust system, there is a danger that the reactor will become too hot when large quantities of non-combusted fuel are emitted from the engine.
OBJECT OF THE INVENTION
An object of the present invention is to provide a reactor arrangement that will function effectively even on two-stroke engines and that will have a long useful life.
SUMMARY OF THE INVENTION
This object can be achieved in principle with the aid of a combustion chamber placed upstream of the reactor and also with the aid of a heat exchanger for transferring heat from the reactor exhaust gases to the combustion chamber. The inventive reactor arrangement can have a precombustion chamber upstream of the reactor, and a heat exchanger for transferring heat from the reactor exhaust gases to the precombustion chamber. The precombustion chamber can be comprised of an expansion chamber for tuning the resistance of engine exhaust gases. A second heat exchanger can be downstream in the reactor exhaust gases to transfer heat to the gas present in the conduit extending between the precombustion chamber and the reactor inlet. The heat exchanger can be comprised of a conduit means that extends transversely through the expansion chamber, the conduit means having an aerodynamic cross-sectional shape so as to have the least possible disturbing effect on the flow in the expansion chamber. The heat exchanger conduit means can have a cross-sectional shape essentially in the form of a symmetrical wing-profile, and can be provided with fins.
Additionally, there can be a method of cleansing the exhaust gases from a two-stroke engine by means of a reactor arrangement, characterized by initiating a precombustion upstream of the actual reactor combustion, with the aid of heat taken from the reactor exhaust gases. The method can also include initiating the precombustion process in an engine exhaust-gas expansion chamber and using the expansion chamber to tune the exhaust resistance of the engine.
The heat exchanger can be heated to such an extent by the exhaust gases from the reactor as to ignite non-combusted fuel in the combustion chamber when the amount of non-combusted fuel increases, therewith providing a self-regulating system.
The present invention relates to a reactor arrangement that is particularly suitable for use with two-stroke engines. The invention also relates to a method of cleaning the exhaust gases emitted from a two-stroke engine.
The above-discussed embodiments of the present invention will be further discussed hereinbelow with reference to the accompanying figures. When the word “invention” is used in this specification, the word “invention” includes “inventions”, that is, the plural of “invention”. By stating “invention”, the Applicant does not in any way admit that the present application does not include more than one patentably and non-obviously distinct invention, and maintains that this application may include more than one patentably and non-obviously distinct invention. The Applicant hereby asserts that the disclosure of this application may include more than one invention, and, in the event that there is more than one invention, that these inventions may be patentable and non-obvious one with respect to the other.
REFERENCES:
patent: 3835645 (1974-09-01), Zoleta
patent: 3968649 (1976-07-01), Edwards
patent: 5396797 (1995-03-01), Suzuki
patent: 5729972 (1998-03-01), Hayashi
patent: 19504208 (1995-08-01), None
patent: 0325111 (1989-07-01), None
patent: 0401178 (1990-12-01), None
patent: 358222910A (1983-12-01), None
Denion Thomas
Nils H. Ljungman & Associates
Trieu T. B.
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