Hydraulic Control for Hydromechanical Transmission.
DEPARTMENT OF THE ARMY WASHINGTON D C
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A power transmission that includes hydraulically-operated clutches that are selectively supplied with operating fluids by a selector valve that is controlled by an error signal means constructed to compare prime mover speed and user demand speed. The transmission preferably is a split torque hydromechanical transmission having one power path going through a hydrostatic pump-motor unit and another path going only through epicycloidal gearing system containing the hydraulically-operated clutches. The transmission is controlled hydraulically rather than mechanically, thereby avoiding problems relating to mechanical slack, response lag, and reliability. Author
- Surface Transportation and Equipment