Work vehicle including startup control current calibration mechanism for proportional control systems

A method of operating a control system for a hydro-mechanical controlled device comprising:

• (a) applying a control current to a controlled device;
• (b) increasing the control current until the controlled device begins to move at a rotational velocity greater than a predetermined rotational velocity;
• (c) decreasing the control current until the controlled device rotates at a rotational velocity less than the predetermined rotational velocity;
• (d) storing, in a memory, the control current determined in step (c), the value thus stored being designated as a control current stop value;
• (e) increasing the control current again until the controlled device begins to rotate at a rotational velocity greater than the predetermined rotational velocity;
• (f) storing, in the memory, the control current determined in step (e), the value thus stored being designated as a control current start value;
• and
• (g) repeating steps (c), (d), (e), and (f) and averaging the resultant control current start values to determine a control current threshold value to start motion of the controlled device, and averaging the control current stop values to determine a control current threshold value to stop motion of the controlled device of the control system.

A work vehicle comprising:

• a chassis;
• an operator station on the chassis;
• a controlled device situated on the chassis and activated in response to a control
• current;
• and
• a calibration system, coupled to the controlled device and including a memory wherein the calibration system is configured for:
• (a) applying a control current to the controlled device;
• (b) repetitively increasing the control current to a control current start value at which motion of the controlled device starts and decreasing the control current to a control current stop value at which such motion stops;
• (c) storing, in a memory, the control current start values and control current stop values;
• and
• (d) averaging the control current start values and control current stop values to determine a control current threshold value.

An agricultural harvesting vehicle comprising:

• a main body;
• an operator station on the chassis;
• a controlled device situated on the main body and activated in response to a control current;
• and
• a calibration system, coupled to the controlled device and including a memory wherein the calibration system is configured for:
• (a) applying the control current to the controlled device;
• (b) repetitively increasing the control current to a control current start value at which motion of the controlled device exceeds a predetermined value and decreasing the control current to a control current stop value at which motion of the controlled device is less than the predetermined value;
• (c) storing, in a memory, the control current start values and control current stop values;
• and
• (d) averaging the control current start values and control current stop values to determine a control current threshold value.