Patent ID: 8862348

Claim:
A method of operating an agricultural vehicle fitted with a CVT and having a lever for varying a transmission ratio of the CVT within a range to permit an agricultural vehicle operator to vary vehicle wheel speed without causing an engine to stall, including the steps of: receiving a signal in a ratio computation unit indicative of a position of the lever, the position of the lever indicative of a desired wheel speed; receiving a signal from the engine in the ratio computation unit indicative of an engine speed; determining the transmission ratio of the CVT in the ratio computation unit for the desired wheel speed, wherein the transmission ratio for the desired wheel speed is determined from the position of the lever, the transmission ratio for the desired wheel speed is limited to an upper limit, and the upper limit is determined based on the engine speed and a rate of change of the engine speed; and transmitting the transmission ratio from the ratio computation unit to a CVT control unit to control the vehicle wheel speed.