Method for estimating and controlling driveline torque in a continuously variable hydro-mechanical transmission

The method of estimating and controlling driveline torque in a continuously variable hydro-mechanical transmission uses pressure data and other metrics of a hydrostatic power unit of the transmission in lieu of actual driveline torque data. A mechanical efficiency of the transmission is determined a...

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Hauptverfasser:	WEERAMANTRY CECIL A, DIX PETER J, PRASSE ROBERT C, BULGRIEN GARTH H, GUO HAIBO
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CALCULATING COMPUTING COUNTING ELECTRIC DIGITAL DATA PROCESSING ENGINEERING ELEMENTS AND UNITS GEARING GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MECHANICAL ENGINEERING PHYSICS THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	The method of estimating and controlling driveline torque in a continuously variable hydro-mechanical transmission uses pressure data and other metrics of a hydrostatic power unit of the transmission in lieu of actual driveline torque data. A mechanical efficiency of the transmission is determined as a function of whether the power unit is operating in a power generation or regeneration mode, and the torque output of the power unit is estimated from that and other hydrostatic parameters. This is used to estimate a torque output of a planetary power unit of the transmission, and the torque on an output member of the driveline is then estimated using that value, and appropriate corrective action taken.