Patent ID: 7096105

Claim:
A control system for controlling the speed of a ring gear in a planetary gear arrangement of a work vehicle when the speed of the ring gear is not known or calculated, the arrangement being coupled to a hydraulic motor, and the ring gear being couplable to an internal combustion engine to be driven thereby, the system including: a. an electronic controller including a digital microprocessor and an electronic digital memory, the controller being configured to regulate a speed of the ring gear in accordance with a dynamic system model by controlling the speed of the hydraulic motor wherein the memory includes a sequence of preprogrammed instructions including the dynamic system model expressed at least in terms of a rotational speed, and the dynamic system model is operated in real time during operation of the arrangement to estimate the speed of the ring gear; and b. at least one sensor coupled to the electronic controller to generate a first signal indicative of the rotational speed and to provide the first signal to the electronic controller, wherein the electronic controller is further configured to receive the first signal input and apply the first signal input to the dynamic system model to responsively control the speed of the planetary ring gear.