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1. (WO2018202703) PLANETARY GEAR PTO UNIT WITH A HYDRAULIC CONTROL, WORK VEHICLE COMPRISING THE SAME AND PTO TORQUE ESTIMATION METHOD

Pub. No.:    WO/2018/202703    International Application No.:    PCT/EP2018/061195
Publication Date: Fri Nov 09 00:59:59 CET 2018 International Filing Date: Thu May 03 01:59:59 CEST 2018
IPC: B60K 17/28
Applicants: CNH INDUSTRIAL AMERICA LLC
CNH (CHINA) MANAGEMENT CO., LTD
CNH INDUSTRIAL BRASIL LTDA.
CNH INDUSTRIAL ITALIA S.P.A.
Inventors: BENEVELLI, Alessandro
CIARROCCHI, Marco, Pietro
Title: PLANETARY GEAR PTO UNIT WITH A HYDRAULIC CONTROL, WORK VEHICLE COMPRISING THE SAME AND PTO TORQUE ESTIMATION METHOD
Abstract:
A PTO unit (1) for a work vehicle comprises: a planetary gear (5) driven by an IC engine of the work vehicle; a PTO spline (S) connected in power transmission to the planetary gear (5) and defining a gear ratio; a hydrostatic transmission (6, 7, 20, 21) driven by the planetary gear (5) to control the gear ratio; a pressure sensor unit (30) for sensing a differential pressure across a loop (20) of the hydrostatic transmission; and a control unit (ECU) programmed to calculate a differential pressure in the loop (20) from a calibration mathematical model representing an unloaded functioning of the PTO spline (S); and a PTO spline torque from a further mathematical model based on said pressure drop, on pressure signals from the sensor unit (30) and on kinematic / hydraulic factors of the planetary gear (5) and the hydrostatic transmission.