A Method for Obtaining Optimum Fuel Economy Performance using Transient Combustion Measurements
Date Published: 2009-04-20
Paper Number:2009-01-0243
DOI: 10.4271/2009-01-0243
Citation:
Soltis, D. and Hollenbeck, D., "A Method for Obtaining Optimum Fuel Economy Performance using Transient Combustion Measurements," SAE Technical Paper 2009-01-0243, 2009, doi:10.4271/2009-01-0243.
An experiment was conducted testing a powertrain package consisting of a four cylinder four valve engine coupled to a four speed automatic transmission in a dynamometer test cell. Cylinder pressure transducers, an encoder, and other instrumentation were used to measure transient combustion events. The transient cycle chosen for testing was a Cold 80 of the Federal Test Procedure (FTP) that produces a standardized fuel economy value. After analyzing the combustion events, a determination was made between the spark advance delivered and a revised spark advance for optimum combustion efficiency. Based upon the relationship between spark advance and fuel consumption, a prediction for the improved fuel consumption was made. The testing was then repeated to evaluate the revised spark advance and the fuel economy benefits in comparison to the predicted values.
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