Abstract
A mobile unit was constructed to demonstrate the relative power performance, fuel efficiency, and exhaust emissions of a compression-ignition engine fueled with biodiesel or petroleum diesel. A Kubota D902-E3B, Tier IV compliant, compression-ignition engine (3-cylinder, 16.1 kW @ 3200 rpm) was mounted on a modified 1.5- x 2.4-m trailer. The engine is fueled from two auxiliary fuel tanks; manual valves are used to select the tank and fuel type. Digital platform scales are used to measure fuel consumption (on a mass basis). A computer-controlled water brake dynamometer is used to load the engine and display engine rpm, torque, and power. Exhaust emissions (HC, CO, CO2, and NOX) are measured using a portable exhaust gas analyzer. Data can be imported into a spreadsheet template and the fuels can be compared on the variables of power, torque, specific fuel consumption, thermal efficiency, and exhaust emissions. The portable unit has been used in educational programs for public school students, college students, farmers, Extension personnel, and industry representatives. Informal feedback and data from pre- and post-test assessments indicate that the mobile unit is an effective method of demonstrating the relative performance, efficiency, and exhaust emissions from compression-ignition engines fueled with biodiesel and petroleum diesel.
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