Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
1999-12-27
2001-04-10
Kamen, Noah P. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C060S595000
Reexamination Certificate
active
06213097
ABSTRACT:
BACKGROUND INFORMATION
The present invention relates to an engine based on the principle of pulsating combustion and a method for operating the engine. Previously proposed gas turbines based on the principle of pulsating combustion, in which energy of the pressure waves reaching the outside via an exhaust pipe is transmitted to a turbine wheel are described in the publication entitled The Pulsejet Engine—A Review of Its Development Potential, U.S. Govern. Report, Monterey, Calif., USA, 1974).
SUMMARY OF THE INVENTION
The engine according to the present invention based on the principle of pulsating combustion and the method according to the present invention for operating the engine have the advantage that the pressure waves produced during pulsating combustion are effectively transmitted to the mechanical driving element. This preferably occurs within the housing, where combustion also takes place. Due to the short transmission paths, less loss of pressure occurs than in the engines known from the related art that are based on this combustion principle. In addition, externally supplied ignition of the fuel/air mixture occurs only while the engine is starting, thus minimizing wear on the ignition components. Because of the inner exhaust gas recirculation that takes place during pulsating combustion, very low system-related NO
x
emissions are produced.
The exhaust mechanism for the exhaust gases advantageously opens into the cylinder chamber in which the piston moves. As a result, the piston itself opens and closes the exhaust mechanism according to the stroke sequence of the combustion process.
Because a free-motion piston is used, there is no need for a crank mechanism, which is required in conventional reciprocating engines, thus eliminating the need for lubrication, since no lateral forces are applied to the piston.
To limit the translational motions of the free-motion piston, the piston motion is limited on the side facing away from the combustion chamber by the compressing action of a spring element, which is preferably designed in the form of a helical compression spring.
The translational motions of the piston can be advantageously utilized to operate a generator. For this purpose, a generator is provided on the engine, and the piston motion can be transmitted to a linear rotor of the generator via a piston rod.
The engine, which in this case is designed in the form of a generator, can be advantageously used in an emergency generating set.
A further advantageous application of the engine is to use it as a drive for a compressor, in particular for use in a heat pump.
The intake mechanism of the engine advantageously has a membrane which automatically opens or closes the intake valve for fuel and combustion air, depending on the pressure ratios in the combustion chamber.
Because the combustion chamber already contains combustion air when the engine starts, the elasticity of the membrane is selected so that it unblocks the opening to the combustion chamber based on the fuel pressure applied to one part of the membrane.
REFERENCES:
patent: 2829276 (1958-04-01), Jarret et al.
patent: 3208439 (1965-09-01), Ulbing
patent: 4777801 (1998-10-01), Porter
patent: 4962641 (1990-10-01), Ghougasian
patent: 5361581 (1994-11-01), Clark
patent: 43 15 046 (1994-11-01), None
patent: 881 347 (1961-11-01), None
Kamen Noah P.
Kenyon & Kenyon
Robert & Bosch GmbH
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