US 12,110,659 B2
Pilot neutralizing system
Scott R. Stahle, Dubuque, IA (US); Brian K. Kellogg, Bellevue, IA (US); and Grant R. Henn, Dubuque, IA (US)
Assigned to DEERE & COMPANY, Moline, IL (US)
Filed by DEERE & COMPANY, Moline, IL (US)
Filed on Feb. 23, 2021, as Appl. No. 17/249,196.
Claims priority of provisional application 62/705,581, filed on Jul. 6, 2020.
Prior Publication US 2022/0002971 A1, Jan. 6, 2022
Int. Cl. E02F 9/22 (2006.01); E02F 9/08 (2006.01); E02F 9/20 (2006.01); E02F 9/26 (2006.01)
CPC E02F 9/2033 (2013.01) [E02F 9/0841 (2013.01); E02F 9/2004 (2013.01); E02F 9/225 (2013.01); E02F 9/2267 (2013.01); E02F 9/2285 (2013.01); E02F 9/267 (2013.01); E02F 9/26 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A pilot neutralizing system of a work vehicle, the work vehicle comprising a frame assembly having a first frame portion and a second frame portion pivotally coupled to the first frame portion, an actuator configured to pivot the first frame portion relative to the second frame portion, the pilot neutralizing system comprising:
a controller configured to electrically receive a signal indicative an articulation position between the first frame portion and the second frame portion;
a pilot neutralizer electrically coupled to the controller and hydraulically coupled between an operator control member and a steering valve to selectively provide a communication of a pilot signal, the pilot neutralizer including a neutralizer unit having a first neutralizer valve and a second neutralizer valve cooperating with the first neutralizer valve to provide the communication of pilot signal, and when the articulation position between the first frame portion and the second frame portion reaches a cushion region during steering, the first neutralizer valve and the second neutralizer valve are one of de-energized and energized by the controller to change the pilot signal at the steering valve to resist the actuator from moving;
a first sensor coupled to the first neutralizer valve and configured to detect a first value;
a second sensor coupled to the second neutralizer valve and configured to detect a second value;
wherein the first value and the second value are compared to determine whether the first neutralizer valve is incorrectly in one of a de-energized state and an energized state and to determine whether the second neutralizer valve is incorrectly in one of the de-energized state and the energized state; and
wherein the pilot neutralizer includes an out port coupled to the steering valve and configured for the communication of the pilot signal, the first neutralizer valve, and the second neutralizer valve coupled to the first neutralizer valve, and the pilot neutralizer includes a shuttle valve coupled to the out port, and the first neutralizer valve and the second neutralizer valve are in a parallel arrangement coupled to the shuttle valve such that one of the pilot signal from the first neutralizer valve and the pilot signal from the second neutralizer valve that has higher pressure flows out from the out port to one end of the steering valve when the articulation position between the first frame portion and the second frame portion is within a steering region.