Patent ID: 9550490
Date: 2017-01-24
CPC Classifications: B60W,F16H

Claim:
1. A method for automatically controlling an angle of a swash plate of a hydrostatic power unit of a continuously variable hydro-mechanical transmission, the method comprising: determining, with a processor-based controller, a desired hydrostatic reciprocal ratio of the hydrostatic drive unit based on a desired transmission reciprocal ratio for the transmission; determining, with the processor-based controller, a feedforward control term based on the desired hydrostatic reciprocal ratio of the hydrostatic power unit, a pump speed for the hydrostatic power unit, and a pressure for the hydrostatic power unit; determining, with the processor-based controller, a closed-loop control term based on an error calculated as a function of the desired hydrostatic reciprocal ratio; calculating, with the processor-based controller, a swash plate command based on the feedforward control term and the closed-loop control term; and transmitting, with the processor-based controller, the swash plate command for adjusting the angle of the swash plate.