Patent ID: 7975478
Filing Date: 2011-07-12
Classification: F01N,F02B,F02M,Y02T

Abstract:
1. A method for recirculating exhaust gas in an internal combustion engine, comprising the steps of: operating the internal combustion engine; operating a first and a second turbine in a parallel fashion; collecting exhaust gas exiting the first and second turbines in a tailpipe; diverting a portion of exhaust gas in the tailpipe at a junction; routing the exhaust gas from the junction into a first tributary inlet of a second compressor that is operably associated with the second turbine; admitting air into a second tributary inlet of the second compressor and into an air inlet of a first compressor that is operably associated with the first turbine; routing a fluid mixture that includes a flow of air from the first compressor and a flow of exhaust gas from the second compressor, to an intake manifold of the engine; determining an engine operating condition; selectively controlling the flow of air entering the second tributary inlet of the second compressor, based on the engine operating condition, to selectively control the flow of air to the second compressor.