Redução de diesel

Páginas: 8 (1845 palavras) Publicado: 4 de setembro de 2012
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VTT PROCESSES

HEAVY-DUTY TRUCK EMISSIONS AND FUEL CONSUMPTION SIMULATING REAL-WORLD DRIVING IN LABORATORY CONDITIONS Nils-Olof Nylund & Kimmo Erkkilä VTT Technical Research Centre of Finland

VTT PROCESSES Kimmo Erkkilä

2005 DEER Conference Aug 21 – 25, Chicago, Illinois, USA

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VTT PROCESSES

CONTENTS

Research on heavy-duty vehicles Rationale for testing completeheavy-duty vehicles Development of test cycles Test results – fuel consumption – exhaust emissions Summary

VTT PROCESSES Kimmo Erkkilä

2005 DEER Conference Aug 21 – 25, Chicago, Illinois, USA

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VTT PROCESSES

RESEARCH INTEGRATE ON HEAVY-DUTY VEHICLES

Finland, like many other countries is highly dependent on road transports Some 75 % of the goods within the borders of Finland aretransported on rubber wheels VTT initiated a three-year (2003-2005) multi-client research project to seek fuel savings for heavy-duty vehicles – 6 research institutes and some 20 sponsors from government, industry and transport companies cooperating www.motiva.fi/raskaskalusto (in Finnish)

VTT PROCESSES Kimmo Erkkilä

2005 DEER Conference Aug 21 – 25, Chicago, Illinois, USA

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VTT PROCESSESTHE GOAL OF THE PROJECT - in a 5-year perspective Permanent fuel savings Vehicles & technology 5-10 % Systems & operations Driver & information

VTT PROCESSES Kimmo Erkkilä

2005 DEER Conference Aug 21 – 25, Chicago, Illinois, USA

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VTT PROCESSES

EMISSION CERTIFICATION

For light-duty vehicles, certification is done running complete vehicles – both emissions and fuel consumptionare reported Both for the US and Europe, HD emission certification is done using stand-alone engines – the outcome is specific emission values (g/hph or g/kWh) for the engine itself tested over a certain duty cycle – the testing does not in any way reflect the properties of the vehicle itself (weight, aerodynamic drag, design of the driveline etc.) – no requirements to report fuel economy

VTTPROCESSES Kimmo Erkkilä

2005 DEER Conference Aug 21 – 25, Chicago, Illinois, USA

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VTT PROCESSES

WHY TEST COMPLETE HD VEHICLES?

There is a clear need to generate emission and fuel consumption figures that take into account the properties of the complete vehicle:


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generating truthful distance based emission and fuel consumption figures effects of load and driving cyclecomparison of vehicles chassis dyno testing also enables checking of in-use vehicles

Within VTT’s research project, both the authorities and the transport companies are very interested in comparable (vehicle to vehicle) emission and fuel consumption figures for various HD vehicles – fuel economy is extremely important for the operators
VTT PROCESSES Kimmo Erkkilä
2005 DEER Conference Aug 21 –25, Chicago, Illinois, USA

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VTT PROCESSES

DEVELOPMENT OF TEST METHODOLOGY
Together with one of the biggest transport companies in Finland (Transpoint) VTT developed a methodology for chassis dynamometer measurement of heavy-duty trucks The key elements in the methodology are – transient type testing on dyno with 2,5 m diameter rollers – using truthful vehicle loading and speed profiles– also taking into account road gradient – determination of accurate rolling and draq resistance by conducting coast-down measurements The speed and road gradient profiles were recorded from actual routes served by Transpoint Varying speed and taking into account the road gradient creates highly transient loading
VTT PROCESSES Kimmo Erkkilä
2005 DEER Conference Aug 21 – 25, Chicago, Illinois, USA 8

VTT PROCESSES

TEST METHODOLOGY – POWER VS. SPEED
Driving resistances against speed for different vehicle categories (fully loaded)
200 180 60t truck with full trailer 42t semi-trailer 26t truck 18t truck 2-axle citybus Large van Small van

Overall driving resistance kW

160 140 120 100 80 60 40 20 0 0

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Speed km/h

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