Ultra-expansion four-stroke internal combustion engine

Details Ultra-expansion four-stroke internal combustion engine Ultra-expansion four-stroke internal combustion engine

F - Mech Eng,Light,Heat,Weapons

02

B

F02B 41/00 (2006.01)

Patent

CA 2568167

The invention discloses an internal combustion engine with super expansion. The engine includes a cylinder (1) and a piston (2). When the piston arrives at the end point of the compression stroke, the compression pressure of intake volume achieving the requested power is in the range of 1.8Mpa to 5Mpa, thereby the combustion temperature and the combustion pressure are improved. The working volume of the cylinder is designed by the super expansion rate depending on the effective pressure for working, wherein the working volume is larger than the intake volume. Making use of the heat energy of combustion gas produced in constant volume expansion stroke, the gas continues to expand in adiabatic condition to form the condition of super expansion work. A part of cooling water jacket is provided on the upper portion of the cylinder. Heat preservation means, but no cooling water jackets are provided on the lower portion of the cylinder, in order to avoid heat loss during the super expansion process. The decrease of the diameter of intake valve, the increase of the diameter of exhaust valve, and the reduction of the lead angle of exhaust can further enhance the effect of super expansion work. The invention can improve the heat efficiency notably, reduce the fuel consumption and pollution.

L'invention concerne un moteur à combustion interne à superexpansion, qui comprend: un cylindre (1) et un piston (2). Lorsque le piston arrive au point final de la course de compression, la pression de compression du volume d'admission permettant d'arriver à la puissance demandée se trouve dans une plage comprise entre 1,8 Mpa et 5 Mpa, ce qui améliore la température de combustion et la pression de combustion. Le volume de travail du cylindre est réglé par la vitesse de superexpansion en fonction de la pression réelle du travail, le volume de travail étant supérieur au volume d'admission. Utilisant l'énergie thermique du gaz de combustion produit lors de la course d'expansion à volume constant, le gaz continue à s'expanser à l'état adiabatique pour constituer l'état du travail de superexpansion. Une chemise d'eau de refroidissement est placée sur la partie supérieure du cylindre. Des moyens de conservation de la chaleur, mais pas de chemises d'eau de refroidissement, sont placés sur la partie inférieure du cylindre, afin d'éviter la perte de chaleur au cours du processus de superexpansion. La réduction du diamètre de la soupape d'échappement, et la réduction de l'angle d'inclinaison de l'échappement permettent de renforcer l'effet du travail de superexpansion. L'invention permet d'améliorer notablement l'efficacité thermique, et de réduire la consommation de combustible et la pollution.

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