Landini Rex 4 Full-Hybrid Tractor

Argo Tractors’ latest research project has borne a prototype Landini REX4 orchard tractor with plug-in hybrid power. Included in this new vehicle are technologies for optimizing mechanical systems, reducing noise levels, recovering energy and intelligently managing power flows in the various electrical devices.
The Landini REX4 Full-Hybrid prototype is powered principally by a 55kW (74hp) diesel engine as installed in the current range of REX4 specialized tractors, which extends to 82kW (112hp) in various width and height configurations to suit different applications and vineyard/orchard growing systems.

Nominal output of 50kW (67hp) and up to 65kW (87hp) peak
Unlike the standard tractors, however, the hybrid power version also has a combined electric motor/generator within the driveline, producing a nominal output of 50kW (67hp) and up to 65kW (87hp) peak, which can either be used on its own or in support of the internal combustion engine.
The regular mechanical transmission is retained, although the electric motor is used for reversing and is selected by the usual shuttle lever beneath the steering wheel. In Full Hybrid mode, the electric motor adds 25kW (33hp) to the diesel engine’s output to assist with power-demand peaks – such as moving off with a heavy trailed load or with high-draft soil engaging equipment.
While in Full Electric mode, the Landini hybrid tractor can operate for approximately two hours on quiet, non-polluting electric power alone. The energy storage battery is topped up when the diesel engine is running thanks to a generator incorporated with the electric motor; a plug-in charging facility enables the battery to be fully recharged when necessary.

Lower fuel consumption
Management software monitors and regulates the power flow, identifying the optimum operating point of the two propulsion systems, and also manages battery charging. In a series of tests to validate what has been developed, conventional and hybrid tractors were compared in a simulated a transport driving cycle, with different loading conditions and speeds explored. The results showed a consistent and significant reduction in fuel consumption of around 14% for the hybrid power combination.
The appeal of being able to operate on electric power alone is particularly relevant in large glasshouses and polytunnels, and especially when working alongside a manual labour force, since there are no diesel exhaust fumes nor excessive noise. To realise this potential, the Landini hybrid tractor is equipped with a variable-speed electric motor to drive the steering and hydraulic system pumps, the latter operating the rear implement hitch and external hydraulic oil flow. Particular attention has been paid to minimising the noise generated by the hydraulic pumps and valves so as not to disturb the peace when running on quiet electric power.

For more information visit: https://www.landini.it/landini-rex4-e...
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