Publicerad: 2013-09-09
ISBN: 978-91-7519-572-8
ISSN: 1650-3686 (tryckt), 1650-3740 (online)
A Cut-To-Length (CTL) forest harvester is used for felling; delimbing and bucking of the tree stems as forwarder is used to forward the logs cut to length to roadside landing for highway transport to the refining facilities like saw- and pulp & paper mills. Fuel consumption of forest harvesting operation is becoming a more and more important cost factor as the fuel prices are raising constantly. A number of studies exist on various hybrid systems related to on- & off-highway vehicles and work machines. This paper deals with technological possibilities and potential to cut down fuel consumption of a CTL harvester by implementation of a hydraulic hybrid system that is mainly designed to take care of the highest power demands. In order to be successful in this aim; a detailed analysis of the work cycle and present power management and transmission systems are needed. Engine load data together with relevant Arcnet and CAN bus messages as well as needed hydraulic system parameters are logged during actual work in order to understand the actual nature of the application in terms of work cycle. This study is focusing on a hydraulic hybrid system; as it seems to be an applicable solution to mobile work machinery in question. However -- a background review of other hybrid solutions is also given. Some of the relevant advantages of a hydraulic hybrid system in forest machine application are also explained in this paper. Based on the prestudy and analysis on the work cycle -- a promising potential for hydraulic hybrid system can be seen in a CTL harvester. Future work to be done is proposed to include simulations to make a more detailed dimensioning of the components and design of the system possible already before building an actual test setup
[1] N.N. Directive 97/68/EC of the European Parliament and of the Council of 16 December 1997 on the approximation of the laws of the Member States relating to measures against the emission of gaseous and particulate pollutants from internal combustion engines to be installed in non-road mobile machinery. Official Journal L 059 ; 27/02/1998 P. 0001 – 0086. 1998.
[2] Felix Prinz zu Hohenlohe. Phlegmatisierung als Tugend in der Mobilhydraulik – Das Energiespeichersystem des Kranvollernters HSM 405H2. Karlsruher Schriftenreihe Fahrzeugsystemtechnik 3. Fachtagung - Hybridantriebe für Arbeitsmaschinen. Karlsruhe; 2011.
[3] L.Lundström; Electrically propulsed vehicle; International Patent Application WO2005/047042; 2005.
[4] J. Morinaga; T. Kawaguchi; H. Inoue. Power generation control method of hybrid construction machine and hybrid construction machine; US Patent 8;207;708B2; 2012.
[5] R. Späth; T. Landmann; D. Boehm. Energierückgewinnungskonzepte bei Hydraulikbaggern. 5. Fachtagung Baumaschinentechnik 2012. 2012.
[6] K. Einola; V. Rintamäki. Method for controlling a power source of a forest machine; US Patent 7;802;595B2; 2010.
[7] J. Järvinen; O. Hankamäki; P. Karjalainen. A Method in controlling an engine of a forest machine and a forest machine. International Patent Application WO03/096794; 2003.
[8] W. Sun; T. Virvalo. Simulation study on a hydraulic-accumulator-balancing energy-saving system in hydraulic boom. Proceedings of the 50th National Conference on Fluid Power. March 16-18 2005; Las Vegas; Nevada USA pp. 371-381.
[9] N.N. Komatsu Ltd. Press Release 2008/05/13. 2008. Komatsu Corporate Communications. Retrieved 25.3.2013 from: http://www.komatsu.com/CompanyInfo/press/2008051315113604588.html
[10] Jönsson A. Weg vom Öl; Forstpraxis.de; Forst & Technik 21.01.2013. 2013. Retrieved 25.3.2013 from: http://www.forstpraxis.de/weg-vom-oel
[11] N.N. ProSilva Plc. Press Release 31.8.2013. Finland. Retrieved 25.3.2013 from: http://www.prosilva.fi/images/stories/pdf/pressrelease.pdf
[12] Rydberg K-E. Energy Efficient Hydraulic Hybrid Drives. The 11th Scandinavian International Conference on Fluid Power. Linköping; Sweden June 2-4. 2009. Linköping University; Department of Management and Engineering.
[13] N.N. Mercedes-Benz UK Ltd. Press release 03-JAN-2013. United Kingdom. Retrieved 25.3.2013 from: http://www.mercedes-benz-media.co.uk/doc/2367/70121mer.doc
[14] Abebayo B. Productivity and cost of Cut-to-Length and Whole-Tree harvesting in a mixed-conifer stand. July 2006. University of Idaho. USA.
[15] J. Inberg; J. Mattila; T. Virvalo. Harvester boom tip acceleration control during a crosscutting – Theoretical background. International Journal of Forest Engineering; Volume 13; Number 1. 2002 . Tampere University of Technology; Finland.
[16] N.N. Hydac International Gmbh. Hydraulic accumulators in hybrid technology. E 10.140.0/05.12. Retrieved 25.3.2013 from: www.hydac.com
[17] N.N. Skogforsk. StanForD – Listing of variables by category; Version 2012-04-18. Retrieved 27.4.2013 from: http://www.skogforsk.se/PageFiles/60712/AllVarGrp_ENG_120418.pdf
[18] P. Achten; S. Eggenkaemp; V. Georges. THE E-HYDRID. – The Twelfth Scandinavian International Conference on Fluid Power; May 18-20; 2011; Tampere; Finland.
[19] N.N. Caterpillar Inc. Press release 15-APR-2013. CAT® 336E H Hydraulic Hybrid Excavator Delivers No-Compromise; Fuel-Saving Performance. Retrieved 27.4.2013 from: http://www.cat.com/cda/layout?m=343975&x=7&id=4375050
[20] N.N. PSA Peugeot Citroen. Dossier de Presse 22.1.2013. Hybrid Air – an innovative petrol full-hybrid solution. Retrieved 27.4.2013 from: http://www.psa-peugeot-citroen.com/sites/default/files/content_files/press-kit_hybrid-air_en.pdf
[21] N.N. Eaton Corporation. Hydraulic Launch Assist Refuse Truck. 2009. Retrieved 27.4.2013 from: http://www.eaton.com/ecm/groups/public/@pub/@eaton/@hyd/documents/content/ct_234114.pdf
