Patent ID: 9206749
Filing Date: 2015-12-08
Classification: F01B,F01L,F02B,F02D

Abstract:
1. A method comprising: reciprocating a first piston between a first bottom dead center (BDC) position and a first top dead center (TDC) position according to a first piston timing; reciprocating a second piston between a second BDC position and a second top dead center TDC position according to a second piston timing, a first crown of the first piston and a second crown of the second piston at least partially defining a combustion chamber of an opposed piston engine; periodically opening and closing at least one passage in fluid communication with the combustion chamber according to a valve timing; and varying the compression ratio of the combustion chamber between a first engine cycle and second engine cycle, the varying of the compression ratio comprising changing at least one of the first piston timing and the second piston timing independently of the valve timing.