US 11,702,819 B2
Electrohydraulic implement control system and method
Todd M. Vanderlinde, Dubuque, IA (US); and John R. Mahrenholz, Dubuque, IA (US)
Assigned to DEERE & COMPANY, Moline, IL (US)
Filed by DEERE & COMPANY, Moline, IL (US)
Filed on Nov. 25, 2019, as Appl. No. 16/693,529.
Prior Publication US 2021/0156122 A1, May 27, 2021
Int. Cl. E02F 3/28 (2006.01); E02F 9/26 (2006.01); E02F 3/34 (2006.01); E02F 5/14 (2006.01); E02F 3/43 (2006.01); E02F 9/20 (2006.01)
CPC E02F 9/265 (2013.01) [E02F 3/3414 (2013.01); E02F 3/432 (2013.01); E02F 3/433 (2013.01); E02F 5/145 (2013.01); E02F 9/2029 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A work machine comprising:
a mainframe;
a boom moveable relative to the mainframe;
a work implement coupled to and moveable relative to the boom;
a work-implement operator control configured to transmit one or more signals indicative of a work-implement movement command;
a boom operator control configured to transmit one or more signals indicative of a boom movement command;
a boom sensor configured to detect a velocity and direction of upward or downward movement of the boom relative to the mainframe and transmit one or more signals indicative of the detected velocity and direction of upward or downward movement of the boom relative to the mainframe; and
a controller configured to (i) receive one or more signals from the work-implement operator control and the boom sensor and (ii) transmit one or more signals to cause movement the work implement relative to the boom based on the detected velocity, direction of upward or downward movement of the boom relative to the main frame, and the work-implement movement command;
wherein the controller includes a memory configured to store ratio data that includes boom velocities and corresponding work implement velocities required to maintain the work implement at a constant angle relative to the mainframe during movement of the boom;
wherein the ratio data includes, for an upward direction of movement of the boom and a downward direction of movement of the boom, boom velocities and corresponding work implement velocities required to maintain the work implement at a constant angle relative to the mainframe during movement of the boom; and
wherein the ratio data for the upward direction of movement of the boom is different than the ratio data for the downward direction of movement of the boom.