Patent ID: 6701710
Filing Date: 2004-03-09
Classification: F02B,F02M,Y02T

Abstract:
An internal combustion engine comprising:a block including a plurality of cylinders; an intake manifold fluidly connected to the block for supplying charge air to the cylinders; an exhaust manifold fluidly connected to the plurality of cylinders for conducting exhaust gases from the cylinders; a turbocharger including a turbine and a compressor; the turbine having an exhaust gas inlet fluidly connected with the exhaust manifold; the compressor having a compressor air inlet and air outlet, the compressor air outlet being fluidly connected to the intake manifold to pressurize the charge air during high power levels of engine operation; an EGR bypass fluidly connected between the turbine exhaust gas inlet and the intake manifold to recirculate a portion of the exhaust gases to the cylinders; and an intake air bypass fluidly connecting the compressor air outlet with the compressor air inlet; the intake air bypass being adapted to recirculate a portion of compressor outlet air back to the compressor air inlet to reduce compressor outlet pressure and aid EGR flow through the EGR bypass to the cylinders during high power operation of the engine; wherein the turbocharger includes a variable geometry turbine operable to raise engine exhaust pressure by restricting exhaust gas flow to the turbine.