Patent ID: 7934486
Filing Date: 2011-05-03
Classification: F01N,F02B,F02M,Y02T

Abstract:
1. A system for controlling combustion in a combustion chamber of a turbocharged engine, the system comprising: a compressor coupled fluidically to an intake manifold of the engine via a throttle valve; a turbine mechanically coupled to the compressor and driven by expanding engine exhaust from an exhaust manifold of the engine; a cooled conduit coupled downstream of the turbine and upstream of the compressor and configured to deliver exhaust to the intake manifold; a shut-off valve coupled in the cooled conduit; an intake valve coupling the intake manifold to the combustion chamber and an exhaust valve coupling the exhaust manifold to the combustion chamber, at least one of the intake valve and the exhaust valve configured for variable valve timing; and an electronic control system configured to adjust the shut-off valve at a first, lower rate and the variable valve timing at a second, higher rate to provide a desired exhaust-gas recirculation rate to the combustion chamber prior to the ignition.