PARAMETRIC SIMULATION OF SIGNIFICANT DESIGN AND OPERATING ALTERNATIVES AFFECTING THE FUEL ECONOMY AND EMISSIONS OF SPARK-IGNITED ENGINES
A fundamental thermodynamic model of the complete spark-ignited, homogeneous charge engine cycle has been used in several parametric analyses to predict the effects of engine design and operating alternatives on fuel consumption and emissions of NOx and unburned hydrocarbons (HC). The simulation includes sub-models for wall heat transfer, NOx and HC emissions, and the engine breathing processes. This work demonstrates the power and utility of a comprehensive engine simulation by presenting several independent parametric studies that were carried out in response to genuine engine design and/or operating strategy questions. Included in this compilation are the effects of cycle heat loss, exhaust port heat loss, combustion duration, and charge dilution (exhaust gas recirculation and/or lean air-fuel ratio). In addition, the influence of the design variables associated with bore-stroke ratio, intake and exhaust valve lift, and cam timing are considered. Actual engine data is shown to enhance and lend validity to the analytical results when appropriate.
- Preprint from the 13-16 November 1978 Meeting.
Warrendale, PA USA 15096
- Novak, J M
- Blumberg, P N
- Publication Date: 1978
- Features: References;
- Pagination: 29 p.
- Society of Automotive Engineers Preprint
- Publisher: Society of Automotive Engineers
- TRT Terms: Air pollution; Analysis; Combustion; Exhaust gases; Fuel air mixtures; Fuel conservation; Fuel consumption; Heat transfer; Hydrocarbons; Internal combustion engines; Mathematical models; Nitric oxide; Nitrogen oxides; Pollutants; Simulation; Spark ignition engines; Thermodynamics; Vehicle power plants
- Uncontrolled Terms: Air fuel ratio; Exhaust gas recirculation
- Old TRIS Terms: Automobile engines
- Subject Areas: Energy; Highways; Vehicles and Equipment;
- Accession Number: 00195317
- Record Type: Publication
- Source Agency: Engineering Index
- Report/Paper Numbers: SAE 780943
- Files: TRIS
- Created Date: Sep 29 1979 12:00AM