Journal
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING
Volume 215, Issue D2, Pages 259-271Publisher
PROFESSIONAL ENGINEERING PUBLISHING LTD
DOI: 10.1243/0954407011525629
Keywords
fuel consumption; continuously variable transmission; automated gear drive; simulation; powertrain modelling
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This paper compares the fuel consumption of lightweight passenger cars with three different types of engine (one low speed and one high speed naturally aspirated spark ignited. one turbo-charged compression ignited) and two different types of transmission [continuously variable transmission (CVT) and automated gear drive]. All fuel consumption results are obtained using a quasistatic driving cycle simulator. The implemented models are described in detail. The engines are represented through their efficiency maps, which are obtained by scaling published data. Efficiency of the transmission (CVT or gear drive) is modelled in dependence on speed, torque and gear ratio. The simulations show that low fuel consumption can be achieved with all those concepts. CVTs show similar results to automated gear drives. The CVT's theoretical advantage of operating the engine at its most fuel-efficient points is compensated by the relatively low efficiency.
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