ETTpush, loggingtruck with extra traction on axles on the trailer for energy saving and increased accessibility

Purpose and goal

The project aims to show that * a timbertruck with a somewhat less powerful motor can suffice for heavy transport if equipped with a system delivering extra traction in the start-up phase * that this may reduce the fuel consumption for the transport * that, by loading in three, somewhat lower piles, it is possible to reduce the fuel consumption even further The project has achieved these goals

Expected results and effects

The Push-function gave higher traction (the available traction increased by 34 %, from 42 to 57 kN on gravel). The Push-truck gets increased passability and provides a safer work situation for the driver. The Push-truck loaded with 4 piles has significantly lower fuel consumption per tonne*km than a normal timber truck with 3 piles. The reduction corresponds to 1 m3 diesel per year for a normal timber truck. Trucks with 4 piles demonstrate better payload usage, better stability and are more stable on the road.

Planned approach and implementation

A timber truck, with a long trailer (for 4 piles) was equipped with a hydraulic hybrid system for propulsion and compared to an "identical" tractor equipped with a conventional 3-pile rig. The steering geometry, traction and fuel consumption was measured under similar conditions experimentally and during 10 months practical operations. The results were analyzed by Skogforsks standard procedures for High Capacity Transport vehicles.