Jianming M Yu

US Patent:

7142968, Nov 28, 2006

Filed:

Aug 3, 2004

Appl. No.:

10/910324

Inventors:

William Guy Alexander - Waterloo IA, US
Thomas Eugene Boe - Cedar Falls IA, US
Derek Malcolm Eagles - Cedar Falls IA, US
Jianming Yu - Cedar Rapids IA, US

Assignee:

Deere & Company - Moline IL

International Classification:

A01B 63/112
G06F 19/00

US Classification:

701 50, 701 1, 701 36, 702 85, 172 8

Abstract:

A method is provided for automatically determining a hitch raise rate calibration value for a hitch control system having a hydraulic actuator for moving the hitch, a valve for controlling flow of hydraulic fluid to the actuator and an electronic hitch control unit. The method includes applying a first control signal to the valve to cause the hitch to raise, determining a first hitch velocity as the hitch moves in response to the first control signal, and repeating these steps for a second control signal. The raise rate calibration value is then calculated as a function of a desired raise velocity, the first and second control signals and the first and second velocities.