Power plants – Pressure fluid source and motor – Cyclically operable reciprocating or oscillating motor or...
Reexamination Certificate
1999-09-01
2001-11-06
Koczo, Michael (Department: 3746)
Power plants
Pressure fluid source and motor
Cyclically operable reciprocating or oscillating motor or...
C060S412000
Reexamination Certificate
active
06311486
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to internal combustion engine. More specifically, a method for a pollution-reducing engine with an independent expansion chamber.
BACKGROUND OF THE INVENTION
In urban and suburban areas, public transport is very often provided by urban buses propelled by conventional engines, which are usually diesel engines that employ a heterogeneous mixture, e.g., diesel fuel, which are particularly polluting. Attempts at making these vehicles run on fuels said to be less polluting (LPG, etc.) have been made, but the results in terms of pollution are particularly weak.
A method for reducing pollution of an engine with an independent external combustion chamber, has described, in the inventor's French patent application, recorded under national record number 95/02838, in which method, the air-fuel mixture is drawn into and compressed in an independent intake and compression chamber then transferred (still under pressure) into the independent combustion chamber to be ignited therein, either using a spark in the case of an engine with a homogenous mixture, or by self-ignition in the case of a diesel engine with a heterogeneous mixture, in order to increase the temperature and pressure of the said mixture which, following the opening of a transfer connecting the said independent combustion chamber to an expansion and exhaust chamber (it too independent), will be expanded in the latter chamber in order to produce work therein, then exhausted to the atmosphere through an exhaust pipe, in which method, when operating in town (or at low power), the fuel injector is no longer operated and, in this case, there is introduced into the combustion chamber, somewhat after the fuel-free compressed air from the intake and compression chamber has been let into the latter, a small amount of additional compressed air from an external reservoir where the compressed air is stored at very high pressure. This small amount of compressed air at ambient temperature will heat up upon contact with the mass of hot air contained in the combustion chamber, and will expand so as to increase the pressure in the combustion chamber to allow work to be delivered during expansion. This engine thus employs a dual-mode or dual-energy operation.
There is a need for an engine, especially for the urban markets, that use less fuel and aid in reducing the pollution caused by other vehicles using conventional internal combustion engines.
SUMMARY OF THE INVENTION
The method of a pollution-reducing engine and its installation in urban buses, for example, makes it possible to eliminate emissions of polluting gases but also allows pollution to be removed partially and considerably from the air in the town.
It is characterized by the means employed, and more particularly by the elimination of the fuel circuit of the engine in favor of simply having mono-mode operation with the injection of additional compressed air, and by fitting upstream of the air intake into the intake an compression chamber of the engine, one or more charcoal filters or any other filtering and purification method, such as molecular sieves, chemical methods or the like, not only allowing dust and other pollutants to be halted, but also allowing the air let into the engine to be purified and pollution removed therefrom.
The additional compressed air stored at very high pressure in the reservoirs of the vehicle is filtered and purified through charcoal filters or the like before being compressed, the ambient air (polluted by the other vehicle) drawn in by the engine into the intake and compression chamber is filtered and purified through the charcoal filter or filters (or any other method that allows it the be purified): it is therefore clear that the air expanded and exhausted through the exhaust is still filtered and purified. Furthermore, as the mode of running the engine on traditional fuel has been eliminated, there can no longer remain in the chamber any particles or other residue originating from a prior combustion.
Other objects, advantages and features of the invention will become clear from reading the non-limiting description of one embodiment of the invention, this being given with reference to the appended drawing.
REFERENCES:
patent: 3847058 (1974-11-01), Manor
patent: 3885387 (1975-05-01), Simington
patent: 3925984 (1975-12-01), Holleyman
patent: 4018050 (1977-04-01), Murphy
patent: 4102130 (1978-07-01), Stricklin
patent: 4696158 (1987-09-01), DeFrancisco
patent: 4798053 (1989-01-01), Chang
patent: 4896505 (1990-01-01), Holleyman
patent: 5638681 (1997-06-01), Rapp
patent: 758534 (1933-11-01), None
patent: 1009307 (1952-03-01), None
patent: 2416344 (1979-08-01), None
Negre Cyril
Negre Guy
Duane Morris LLP
Koczo Michael
Negre Guy
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