Mack Trucks, Inc.

Robert Gorman

Stephen Geyer

Gregory J Birky

Charlie C Kim

Stephen M Geyer

In a method of maintaining temperature of engine exhaust gas from cylinders of a multi-cylinder engine () with a desired range, exhaust gas from a first group of cylinders () including at least one cylinder is routed to at least one of an EGR system () and an exhaust system (). Exhaust gas from a second group of cylinders () including at least one of the cylinders is routed to the exhaust system (). Routing of the exhaust gas from the first group of cylinders between the EGR system and the exhaust system is controlled to maintain a temperature of engine exhaust gas within a desired range. An engine (), a control system (), and a controller (), as well as an exhaust gas mixture, are also disclosed.

Engine and method of maintaining engine exhaust temperature

A turbocharged internal combustion engine assembly with exhaust gas recirculation (EGR) includes an air compressor driven by an exhaust turbine, an EGR line that diverts exhaust gases from an exhaust line leading from the engine to an air intake line leading to the engine from the compressor, and a combustion bypass line that conveys compressed air from the compressor to the exhaust turbine without combustion. A pressure adjusting feature disposed along at least one of the air intake line and the exhaust line maintains the pressure at the turbine inlet below the pressure at the compressor outlet and above the pressure at the air inlet of the engine. Examples of suitable pressure adjusting features include a venturi placed in the air intake line at the second point, a power turbine located along the exhaust line downstream of the exhaust turbine, a split exhaust manifold feeding unequal turbine inlets, and an orifice located along the exhaust line between the EGR line and the bypass line.

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Chambersburg, PA, United States of America

Robert Gorman