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Technical Paper

A Turbocharged Spark Ignition Engine with Low Exhaust Emissions and Improved Fuel Economy

Turbocharging, in addition to increasing an engine's power output, can be effectively used to maintain exhaust emission levels while improving fuel economy. This paper presents the emission and performance results obtained from a turbocharged multicylinder spark ignition engine with thermal reactors and exhaust gas recirculation (EGR) operated at steady-state, part-load conditions for four engine speeds. When comparing a turbocharged engine to a larger displacement naturally aspirated engine of equal power output, the emissions expressed in grams per mile were relatively unchanged both with and without EGR. However, turbocharging provided an average of 20% improvement in fuel economy both with and without EGR. When comparing the turbocharged and nonturbocharged versions of the same engine without EGR at a given load and speed, turbocharging increased the hydrocarbon (HC) and carbon monoxide (CO) emissions and decreased oxides of nitrogen (NOx) emissions.

Emission Control and Fuel Economy for Port and Direct Injected SI Engines

Emission and fuel economy regulations and standards are compelling manufacturers to build ultra-low emission vehicles. As a result, engineers must develop spark-ignition engines with integrated emission control systems that use reformulated low-sulfur fuel. Emission Control and Fuel Economy for Port and Direct Injected SI Engines is a collection of SAE technical papers that covers the fundamentals of gasoline direct injection (DI) engine emissions and fuel economy, design variable effects on HC emissions, and advanced emission control technology and modeling approaches. All papers contained in this book were selected by an accomplished expert as the best in the field; reprinted in their entirety, they present a pathway to integrated emission control systems that meet 2004-2009 EPA standards for light-duty vehicles.
Technical Paper

Mobile Electric Power Technologies for the Army of the Future

A technology assessment of engines, power source and electrical technologies that can meets the needs of the future U.S. Army (“Army 21”) for cost-effective generator sets is made. Considered in this assessment are: diesel engines; stratified-charge, spark-ignited engines; homogeneous-charge, spark-ignited engines; gas turbine engines; and Stirling engines. Direct energy conversion devices including batteries, fuel cells, thermal-to-electric generators, and nuclear powered systems are also considered. In addition, potential advances in electric alternators and power conditioning, applications of networking, and noise reduction methods are discussed for possible application to the Army environment. Recommendations are made for the potential application of the different technologies for the needs of Army 21.