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Simplified Methodology for Modeling Cold Temperature Effects on Engine Efficiency for Hybrid and Plug-in Hybrid Vehicles
Technical Paper
2010-01-2213
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
For this work, a methodology of modeling and predicting fuel
consumption in a hybrid vehicle as a function of the engine
operating temperature has been developed for cold ambient operation
(-7°C, 266°K). This methodology requires two steps: 1) development
of a temperature dependent engine brake specific fuel consumption
(BSFC) map, and, 2) a data-fitting technique for predicting engine
temperature to be used as an input to the temperature dependent
BSFC maps. For the first step, response surface methodology (RSM)
techniques were applied to generate brake specific fuel consumption
(BSFC) maps as a function of the engine thermal state. For the
second step, data fitting techniques were also used to fit a
simplified lumped capacitance heat transfer model using several
experimental datasets.
Utilizing these techniques, an analysis of fuel consumption as a
function of thermal state across a broad range of engine operating
conditions is presented. These techniques allow for prediction of
fuel consumption for a vehicle as a function of the engine's
operation and temperature. Results will be shown over repeated
Urban Dynamometer Driving Schedule (UDDS) and US06 cycles at an
ambient test cell temperature of 266°K. Details into the
variability of fueling rates under a broad range of engine
temperatures are presented. Certain details into the technique will
be presented, as well as analysis comparing the model to
experimental datasets.
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Citation
Jehlik, F., Rask, E., and Christenson, M., "Simplified Methodology for Modeling Cold Temperature Effects on Engine Efficiency for Hybrid and Plug-in Hybrid Vehicles," SAE Technical Paper 2010-01-2213, 2010, https://doi.org/10.4271/2010-01-2213.Also In
References
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