The SMV 4531 features:

• A hybrid diesel/electric driveline which Konecranes describes as 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. This motor also generates electrical energy when braking, minimizing the need for mechanical braking and saving energy.

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• An electrified hydraulic lifting system which, unlike in a conventional reachstacker with the diesel engine mechanically driving variable displacement piston pumps that provide the hydraulic energy for lifting and steering, the hydraulic pumps in the new hybrid reachstacker 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 regenerating electrical energy.

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