Diesel-free
Two doctoral students are to be employed in the project, and the deadline for applying for these is 22 June. This means that those to graduate from Master’s programmes in the early summer can apply. “We have already seen that many people are interested”, she says.Working vehicles are to be made diesel-free. However, the diesel in these machines doesn’t only drive the vehicle itself, but also the cylinders and the actuators needed to lift and lower the buckets, lifting arms and other tools, which often have heavy contents. Hydraulic systems are reliable and durable in demanding surroundings such as mines and building sites.
“When we integrate the pump with the electric motor, we can remove a power-transfer stage, since the electromagnetic forces in the electric motor and the hydraulic forces in the pump act on the same mechanical parts. This reduces the losses. Losses also arise in today’s diesel systems when two cylinders, one on each side of the bucket or lift arrangement, require different pressure levels. If we can achieve electrical operation, we may be able to have two electric motors and distribute the power as it is required”, says Liselott Ericson.
Electrohydraulic
The project, “Energy-efficient compact electrohydraulic solutions for components and systems in working machines” (abbreviated as “Ehydraulik”), will run for three years and is part of a Swedish initiative in vehicle research and innovation, FFI. The work will be conducted in close collaboration with the motor industry, and partners in the project include Volvo Construction Equipment, Epiroc Rock Drills, Volvo Personvagnar and Gnutti Carlo Sweden.Translated by George Farrants
