Patent ID: 8656888

Claim:
A method of controlling the volumetric ratios of a rotary engine having a rotor received in an internal cavity of a housing and defining rotating chambers with variable volume, the method comprising: providing at least a secondary inlet port of the engine rearwardly of a primary inlet port thereof and forwardly of an exhaust port thereof along a direction of a revolution of a rotor of the engine; and controlling a communication between an air source and the inlet ports of the engine outside of the internal cavity, including selecting between a first configuration where the primary inlet port communicates with the air source and communication between the air source and the secondary inlet port is blocked to obtain a first volumetric compression ratio, and a second configuration where the secondary inlet port communicates with the air source and communication between the air source and the primary inlet port is blocked to obtain a second volumetric compression ratio being higher than the first volumetric compression ratio.