CPC F15B 15/2838 (2013.01) [E01C 23/088 (2013.01); F15B 2211/4053 (2013.01)] | 19 Claims |
1. A milling machine, comprising:
a frame;
a milling drum attached to the frame;
a plurality of ground engaging tracks configured to support the frame and to propel the milling machine in a forward or rearward direction;
a plurality of actuators connecting the frame to the tracks, the actuators being configured to adjust a height of the frame relative to a ground surface, each of the actuators including:
a cylinder attached to the frame and containing a hydraulic fluid;
a piston slidably disposed within the cylinder; and
a rod having a first end connected to the piston and extending to a second end connected to a track from among the plurality of ground engaging tracks;
a tank configured to store the hydraulic fluid;
a fluid conduit connecting the tank to the cylinder;
a control valve configured to selectively control a flow rate of the hydraulic fluid in the fluid conduit; and
a controller configured to determine the height of the frame relative to the ground surface by:
determining an amount of current flowing through the control valve; and
determining the flow rate based on the amount of current.
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