Konecranes has introduced the world’s first hybrid reach stacker, the SMV 4531 TB5 HLT for container handling, with a lifting capacity of 45 tonne. It features a hybrid diesel/electric driveline, electrified hydraulic lifting system, and a super capacitor based energy storage. This innovative lift truck will cut fuel consumption and emissions with at least 30 per cent while offering improved performance, acceleration and response to driver’s commands.
The new reach stacker will offer customers substantial cost and environmental benefits. Estimated fuel consum-ption at normal handling of fully loaded containers will be at least 30 per cent lower than for equivalent diesel powered reach stackers. In the new hybrid reach stacker, the driveline is a serial configured diesel/electric system consisting of a diesel engine, an electrical generator and an electrical traction motor. The diesel engine runs at constant RPM for optimum fuel efficiency and powers the generator. Propulsion is provided by an electric motor that is an integral part of the drive axle.
The hydraulic pumps are electrically driven and electronically controlled. Dedicated electric motors drive the pumps that provide the hydraulic energy for lifting and steering. The speed of these pumps can be controlled independently of diesel engine speed. More importantly, the return flow from the hydraulic cylinders is not converted into heat, but fed backwards through the pumps which now act as hydraulic motors, thus rege-nerating electrical energy.
The new hybrid reach stacker has a super capacitor system for energy storage that is connected to the truck’s electrics. This system stores electrical energy that has been recovered for later re-use, and boosts the diesel powered electrical generator at times of peak power demand.
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