Patent ID: 6622471
Filing Date: 2003-09-23
Classification: F01B,F02B,F02F,F02M,Y02T,Y10T

Abstract:
A method for driving a combustion motor comprising the following steps:providing cyclical combustion of a fuel in a combustion chamber; letting hot pressurized combustion gas created during the combustion flow into an expansion chamber separate from the combustion chamber where it moves a piston while expanding during an expansion phase; wherein at least for a partial load operation of the motor the combustion gas in the expansion chamber already reaches atmospheric pressure before the end of the expansion phase of the combustion gas; in consequence, the movement of the piston continues in the same direction of movement while further expanding the combustion gas in the expansion chamber and pressure is generated that is below atmospheric pressure; and spraying cooling liquid into the expansion chamber and into the combustion gas which is at subatmospheric pressure at the end of the expansion phase of the combustion gas; wherein the pressure of the combustion gas is reduced further and the subatmospheric pressure in the expansion chamber acts on the piston and the piston performs work under the effect of this subatmospheric pressure.