Hydraulic system having speed-based command boosting

A method of controlling a work tool on a mobile machine, comprising:

• determining a travel speed of the mobile machine;
• determining an error between a desired position of the work tool and an actual position of the work tool;
• determining a command for at least one control valve associated with a hydraulic actuator of the work tool based on the error;
• and
• selectively modifying the command based on the travel speed of the mobile machine,
• wherein selectively modifying the command results in the work tool moving to the desired position faster at higher travel speeds.

A mobile machine, comprising:

• a body;
• an engine supported by the body;
• at least one traction device configured to support the body and driven by the engine to propel the mobile machine;
• a speed sensor configured to generate a signal indicative of a travel speed of the mobile machine;
• a work tool operatively connected to the body;
• a hydraulic cylinder connected to move the work tool;
• at least one control valve configured to regulate flows of fluid into and out of the hydraulic cylinder;
• a positioning system configured to detect an actual position of the work tool;
• and
• a controller in communication with the speed sensor, the at least one control valve, and the positioning system, the controller being configured to:
• determine the travel speed of the mobile machine based on the signal generated by the speed sensor;
• determine an error between a desired position of the work tool and the actual position of the work tool;
• determine a command for the at least one control valve based on the error;
• and
• selectively increase the command based on the travel speed of the mobile machine and a map stored in memory relating the travel speed of the mobile machine to the increase in the command,
• wherein:
• selectively increasing the command results in the work tool moving to the desired position faster at higher travel speeds;
• the command is increased by a first amount and during only a first portion of movement of the at least one control valve when the positioning system is a global positioning system;
• and
• the command is increased by a second amount greater than the first amount and during a second larger portion of movement of the at least one control valve when the positioning system is a local laser positioning system.

A hydraulic system for a mobile machine, comprising:

• a work tool;
• a hydraulic actuator configured to move the work tool;
• at least one control valve configured to regulate fluid flow to the hydraulic actuator;
• and
• a controller in communication with the at least one control valve, the controller being configured to:
• determine a travel speed of the mobile machine;
• determine an error between a desired position of the work tool and an actual position of the work tool;
• and
• determine a command for the at least one control valve based on the error and on the travel speed of the mobile machine,
• wherein the command moves the work tool to the desired position faster at higher travel speeds.