Patent ID: 6434938
Filing Date: 2002-08-20
Classification: F02B,F02D,Y02T

Abstract:
An internal combustion engine comprising:an intake system through which charge air is delivered to an intake manifold of the engine, including a turbocharger that comprises a compressor operated by exhaust gases from the engine for delivering compressed charge air into the intake manifold; a bleed for bleeding an amount of the compressed charge air; exhaust valves that are normally closed but open to allow the exhaust gases to exit combustion chambers of the engine; a control for controlling a timing of the opening of the exhaust valves in relation to an engine operating cycle, for controlling fueling of the engine in relation to the engine operating cycle, and for controlling the bleed; wherein when the control increasingly retards exhaust valve opening in relation to the engine operating cycle to cause the turbocharger to increase pressure in the intake manifold, the control increases engine fueling in relation to the increased pressure in the intake manifold, and, in response to an incipient surging of the compressor resulting from such increasingly retarded timing of the exhaust valve opening and such increased engine fueling, operates the bleed to counteract such compressor surging.