Patent ID: 7594492
Filing Date: 2009-09-29
Classification: F01B,F01L,F02B,F02D,F02F,F02G,Y02T

Abstract:
1. An internal combustion engine, comprising: a compression cylinder having a piston therein; a combustion chamber; an expansion cylinder having a piston therein; an outlet port through which gas can flow from the compression cylinder to the combustion chamber; an inlet port through which gas can flow from the combustion chamber to the expansion cylinder; a first rotary valve member having first and second openings that move into and out of communication with respective ones of the outlet and inlet ports; a second rotary valve member disposed concentrically of the first valve member and having first and second openings which at least partly overlap with the first and second openings in the first valve member; and a control for adjusting the relative rotational positions of the valve members to change the degree of overlap between the openings and thereby control the timing and duration of communication between the compression cylinder and the combustion chamber and between the combustion chamber and the expansion cylinder.