Hybridisation of non-road mobile machinery reduces fuel consumption considerably without loss of efficiency

According to a dissertation that will undergo a public examination at Lappeenranta University of Technology (LUT), the fuel consumption of non-road mobile machinery can be cut in half without weakening the machine's efficiency. With these significant savings, the currently high-priced hybrid mobile machinery will be able to pay for itself within a few years.

Jarkko Nokka, M.Sc. (Tech.), studied the hybridisation of non-road mobile machinery virtually.  Depending on the type and purpose of the machine, hybridisation will achieve clear savings in fuel consumption. Energy efficiency analyses with three mobile machines showed that hybridisation can halve fuel consumption without compromising efficiency. In the tests, the machines were able to transport the same amount of rocks in the same time as the fuel consumption dropped within an hour from 20 litres to roughly 10.

"With these significant savings, the currently high-priced hybrid mobile machinery will be able to pay for itself within a few years," assesses Nokka.

In a serial hybrid non-road mobile machine, the diesel engine is in practice only the charger for the batteries in the machine, and the machine is operated with electric motors.

To support long and expensive product development processes, modern technology enables virtual modelling with a digital duplicate that imitates the original machine precisely. Modifying a virtual non-road mobile machine and thus scaling e.g. the energy storage or the diesel power needed is easier and faster. The machine can be analysed further and in more detail before building an actual, physical prototype.

The rising oil price, energy efficiency thinking, and increasingly stringent emission requirements of diesel engines are driving mobile machine manufacturers to come up with new solutions for managing energy efficiency and emissions. Full electrification and hybridisation have efficiently reduced fuel consumption and local emissions in the automobile industry, and hybridisation is also highly suitable for non-road mobile machinery. The size of a diesel engine can be reduced and its use is more efficient.

The dissertation of Jarkko Nokka, M.Sc. (Tech.), entitled "Energy Efficiency Analyses of Hybrid Non-Road Mobile Machinery by Real-Time Virtual Prototyping"  in the field of electrical engineering will undergo a public examination on 12 January 2018 at 12.00 noon in LUT's auditorium 2310. The opponents will be Professor Kari Tammi from Aalto University and Veli-Matti Leppänen, D.Sc. (Tech.), from ABB. Professor Juha Pyrhönen from Lappeenranta University of Technology will be the custos. The majority of the funding for the research was provided by Tekes – the Finnish Funding Agency for Innovation.

The dissertation has been published in the university's publication series Acta Universitatis Lappeenrantaensis, publication number 785. ISBN 978-952-335-192-9, ISBN 978-952-335-193-6 (PDF) and ISSN 1456-4491. The dissertation is available in the LUTPub database of Lappeenranta University of Technology at XXX. Printed copies can be purchased from the Aalef bookstore, tel. +358 44 744 5511 or kirjakauppa(at)aalef.fi, and from the LUT Shop online store at https://lutshop.lut.fi.

Doctoral candidate:

Name: Jarkko Nokka

Year and place of birth: 1988, Virolahti, Finland

Domicile: Lappeenranta

Education: M.Sc. (Tech.), Lappeenranta University of Technology (LUT), 2013

Career history: Mevea Oy, Project Engineer, starting 2013

Additional information:

Jarkko Nokka, tel. +358 40 5684196, jarkkonokka@gmail.com