Method Of Using Feedforward Compensation Based On Pressure Feedback For Controlling Swash Plate Angle In A Hydrostatic Power Unit Of A Continuously Variable Transmission

摘要

A swash plate angle for a hydrostatic power unit of a continuously variable hydromechanical transmission is determined using a feedforward compensation term, to reduce reliance on closed loop control. The feedforward term is based on knowledge of the hydrostatic power unit determined as a function of knowledge of certain parameters, including, but not limited to, hydrostatic power unit pressure, swash plate angle, desired hydrostatic power unit ratio, and pump speed.

主权项

1. A method for automatically controlling an angle of a swash plate of a hydrostatic power unit of a continuously variable hydro-mechanical transmission, comprising a step of:
determining a target ratio of a pump speed and a motor speed for the hydrostatic power unit, using a closed loop control term and a feedforward term.