Patent ID: 8668042

Claim:
A hydraulic system comprising: a hydraulic transmission including: a hydraulic pump configured to be coupled to a prime mover, a hydraulic motor configured to be coupled to an output shaft, and fluid lines coupling the hydraulic pump to the hydraulic motor to provide a fluid circuit providing flow communication between the hydraulic pump and the hydraulic motor, such that operation of the hydraulic pump provides fluid flow to the hydraulic motor, and the hydraulic motor supplies torque to the output shaft; and a controller configured to control operation of the hydraulic transmission, wherein the controller is configured to receive signals indicative of pressure in the fluid circuit and reduce an output of the hydraulic pump when the pressure in the fluid circuit reaches a pressure limit, wherein a rate of response of the reduction of the output of the hydraulic pump is varied based on a temperature of fluid in the fluid circuit, wherein the rate of response increases with increased temperature of the fluid in the fluid circuit, and wherein the rate of response is at a minimum when the temperature of the fluid in the fluid circuit is below a first temperature level, wherein the rate of response is at a maximum when the temperature of the fluid in the fluid circuit reaches a second temperature level, and wherein the first temperature level is less than the second temperature level.