Hybrid systems in Case IH tractor prototype

25 Nov, 2005 08:57 AM
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Case IH reportedly has developed a tractor that is powered by a diesel engine and a transmission that incorporates two 50kW (67hp) electric motor/generators.

Still in the developmental stage, the ProHybrid EECVT is based on a Case MXM tractor and uses technology from the Steyr continuously variable transmission (CVT) now used in Case IH's CVX tractors.

While a standard CVT combines mechanical and hydraulic drives to initiate stepless ratio changes, the new hybrid system introduces electrical power into the driveline (in place of oil pumps and motors) but retains the mechanical aspects of the more conventional setup.

Similar to a standard CVT, the system uses a greater proportion of mechanical drive as speed increases. Pumping out a maximum of 160hp, the diesel engine provides the power for both the mechanical drive and the electrical system.

Excess energy that would otherwise be wasted is stored in a large battery that sits on the tractor's nose in place of front weights.

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