Work tool alignment system for work vehicle

A work vehicle having an implement alignment system, the work vehicle comprising:

• a frame supported above a ground surface by a plurality ground engaging units, wherein the plurality of ground engaging units are operable to propel and steer work vehicle along the ground surface;
• a boom assembly having a near end and a distal end, the boom assembly pivotably coupled to the frame at the near end and extending in a boom direction to the distal end, wherein the boom assembly is configured to pivot the distal end through an arc between an upper position and a lower position;
• a work tool pivotably attached to the distal end and coupled to the frame via the boom assembly, the work tool configured to rotate an implement having an implement tip about a tool axis, wherein the work tool has a tool length indicative of the position of the implement tip relative to the distal end, the tool axis having a longitudinal inclination to a vertical axis and a transverse inclination to the vertical axis relative to the boom direction;
• a tool axis sensor configured to measure the longitudinal inclination and the transverse inclination of the tool axis, and to generate an inclinometer signal in response;
• a boom position sensor configured to measure a pivot position of the implement tip relative to the frame and to generate an arc position signal in response, wherein the arc position signal is indicative of a reach distance and a height of the implement tip relative to the frame;
• a controller configured to receive an align command and to operate the ground engaging units to align the tool axis with the vertical at least in part in response to the arc position signal.