Fan Control

Abstract

The present disclosure relates to a hydraulic fan control circuit for a machine, in particular for a motor vehicle, a construction machine or a lifting device, with at least one hydraulic pump and at least one hydraulic motor for driving at least one fan, wherein the hydraulic motor driving torque of at least one hydraulic motor is controllable by adjusting the absorption volume.

1 . A hydraulic fan control circuit for a machine, comprising: at least one hydraulic pump and at least one hydraulic motor for driving at least one fan, wherein a hydraulic motor driving torque of at least one hydraulic motor is controllable by adjusting an absorption volume of the at least one hydraulic motor. 
     
     
         2 . The hydraulic fan control circuit according to  claim 1 , wherein the at least one hydraulic pump is a variable displacement pump and a speed of the one or more fans is adjustable by a hydraulic motor. 
     
     
         3 . The hydraulic fan control circuit according to  claim 2 , wherein exactly one hydraulic pump is provided in the fan control circuit. 
     
     
         4 . The hydraulic fan control circuit according to  claim 3 , wherein control of the driving torque and/or of the fan speed is steplessly variable between standstill of the fan and maximum fan speed. 
     
     
         5 . The hydraulic fan control circuit according to  claim 4 , comprising at least two fans and/or hydraulic motors connected in parallel. 
     
     
         6 . The hydraulic fan control circuit according to  claim 5 , wherein at least one fan cools an engine charge air. 
     
     
         7 . The hydraulic fan control circuit according to  claim 5 , wherein at least one fan cools an engine water. 
     
     
         8 . The hydraulic fan control circuit according to  claim 5 , wherein at least one fan cools hydraulic oil of the machine. 
     
     
         9 . The hydraulic fan control circuit according to  claim 1 , wherein the hydraulic pump is coupled to a drive train of the machine. 
     
     
         10 . The hydraulic fan control circuit according to  claim 9 , wherein the drive train drives one or more of a motor vehicle, a construction machine, and a lifting device. 
     
     
         11 . The hydraulic fan control circuit according to  claim 1 , wherein the pump is a variable displacement pump. 
     
     
         12 . A machine, comprising:
 a hydraulic fan control circuit including:
 a variable displacement pump; 
 a first hydraulic motor coupled to a first fan; 
 a second hydraulic motor coupled to a second fan, the second hydraulic motor coupled in the circuit in parallel with the first hydraulic motor, each of the first and second hydraulic motors independently controllable via respectively controlled absorption volumes of the first and second hydraulic motors; and 
   a control system including non-transient, computer-readable medium including instructions which, when executed by a processor, independently adjust fan speed of the first and second fans responsive to conditions, while maintaining the same supply pressure to respective inlets of the first and second hydraulic motors.   
     
     
         13 . The machine of  claim 12 , wherein the instructions further adjust fan speed from stopped to a maximum speed. 
     
     
         14 . The machine of  claim 13 , wherein the first fan is coupled to cool a coolant medium of an engine, the engine driving the variable displacement pump; and the second fan coupled to cool oil flowing through the first and second hydraulic motors. 
     
     
         15 . A hydraulic fan control circuit for a machine, comprising:
 a first hydraulic pump providing pressure to a first hydraulic motor driving a first fan, the pump further providing pressure to a second hydraulic motor driving a second fan, wherein a hydraulic motor driving torque of each of the first and second hydraulic motors is independently controllable by adjusting respective absorption volumes of the first and second hydraulic motor, while maintaining the same pressure provided to the first and second hydraulic motors.