Patent ID: 8141361

Claim:
A natural gas fueled internal combustion engine comprising: a gas injection system operable to inject natural gas; and an air suction route to a cylinder housing of said natural gas fueled internal combustion engine, wherein the natural gas fueled internal combustion engine has a cubic capacity between about 1.0 liter to 1.8 liters and a compression proportion of 12 to 14, wherein the air suction route is coupled to the gas injection system, the air suction route comprising: an exhaust turbo charger comprising; a supercharger; and a turbine; a compressor located upstream from the exhaust turbo charger in the air suction route, a coupling for coupling and decoupling of the compressor with a crankshaft of the internal combustion engine; a push mode air circulation valve coupling an output of the exhaust turbo charger with an input of the exhaust turbo charger; and a supercharger butterfly valve coupled between the exhaust turbo charger and the compressor and configured to deliver airflow to the exhaust turbo charger through said compressor in a first operation mode, and to deliver airflow directly to said exhaust turbo charger via a compressor bypass in a second operation mode, wherein control of the airflow supplied directly to said exhaust turbo charger via said compressor bypass is based at least on one of the following: if the compressor provides an insufficient air amount to the exhaust turbo charger; or if the compressor is unseated.