Boosting power without increasing emissions in forestry equipment
Forest machinery must be reliable and durable to cope with sizeable trees, variable terrain and hard tree surfaces found in the forests of Central Europe and North America. In particular, harvesters need to be robust to provide instant, significant power for maximum output without compromising the integrity of the harvested trees.
Since 1992, Logset, a Finnish forest machine manufacturer, has produced world-class harvesters and forwarders with a steadfast commitment to sustainable forestry. The engineers at Logset were looking for a way to improve the existing function of its largest harvester to maximize its output without taxing the engine or damaging the harvest in the process.
Power of partnership
While an obvious solution might be to use a larger, more powerful engine for the harvester, that option would only flatten the trees and damage the land before the trees could be harvested. They needed a better solution. And to find it, Logset turned to its partners at Danfoss Editron.
Together, they designed the Logset 12H GTE Hybrid Harvester — the first of its kind in forest machinery.
“During the 12-month project, we worked very closely with Danfoss Editron to develop the most powerful forest machine in the world. Electrifying the 12H GTE Hybrid machine by integrating EDITRON also brings significant economic and environmental improvements,” said Jukky Kivipelto, Technical Director of Logset. The EDITRON software controls and optimizes each individual component of the hybrid drivetrain, making power distribution in the 12H GTE Hybrid far more intelligent.
Better for the environment and productivity
With this application of EDITRON, the parallel hybrid system reacts instantly to the workload, providing an extra power boost to the 7.4-liter Final Tier 4 diesel engine. The hybrid system can quickly deliver up to 510 hp (380 kW) and generate 2,000 Nm of torque. The heavy-duty horse power guarantees the machine can manage demanding applications.
The hybrid machine is very compact, yet delivers a 72 percent increase in power, 54 percent increase in torque and 5 percent noise reduction. It weighs 54,000 lbs while remaining in a higher power group, offering increased power density. This means customers can have the same amount of power in a smaller machine.
Furthermore, the working efficiency of the 12H GTE Hybrid harvester is 27 percent higher than non-hybrid machines. The integration of EDITRON also significantly reduces the fuel consumption (by 20 to 30 percent) and CO2 and small particle emissions per felled cubic meter (by 25 percent), which is a benefit to the environment.
“We are pleased to supply our EDITRON technology and extensive knowledge of electrifying heavy-duty machinery to create the 12H GTE Hybrid harvester, the newest member of the Logset family,” said Tomi Ristimaki, Sales Director OEM of Danfoss Editron. “The machine meets market demand for more powerful harvester solutions that can handle the challenging forestry conditions found in Central Europe, Australia and Northern Europe.”
|Project||Logset hybrid forest harvester|
|Scope||Electric drivetrain system integrating parallel hybrid drive which draws power from both an electric motor and a diesel engine|
|Solution||Logset 12H GTE Hybrid|
EDITRON parallel hybrid system
EM-PMI electric motor/generator