Motor vehicles – Steering gear – With fluid power assist
Reexamination Certificate
2009-12-09
2011-11-15
Boehler, Anne Marie (Department: 3611)
Motor vehicles
Steering gear
With fluid power assist
C180S432000
Reexamination Certificate
active
08056672
ABSTRACT:
A steering control system for directing fluid to steering actuators on a machine include a set of right and left manually-operated pilot pressure fluid control valves and a set of right and left electro-hydraulic (EH) pilot pressure fluid control valves, with both sets being coupled to a main steering control valve for controlling movement of the latter to effect operation of the steering actuators. An electronic control unit (ECU) includes a computer and a memory and receives signals representative of various operating parameters of the control system and of the vehicle ground speed and operates to control the EH pilot pressure control valves and a set of right and left solenoid-operated valves such that only flow from the set of manually-operated valves is connected for operating the main steering control valve to effect a least aggressive steering mode when the vehicle speed is indicative of road travel, and for also actuating the EH pilot pressure control valves for effecting a more aggressive steering mode when the vehicle speed is low indicating off-road travel. EH valve failure results in the control system defaulting to that for effecting the least aggressive steering mode, while failure of one or both of the manually-controlled valves results in the EH control valves being activated to provide that pilot pressure called for by the manually-operated valve.
REFERENCES:
patent: 6067782 (2000-05-01), Diekhans
patent: 6408977 (2002-06-01), Obertrifter et al.
patent: 7200993 (2007-04-01), Khalil et al.
patent: 7283900 (2007-10-01), Gacioch, Jr. et al.
patent: 7334658 (2008-02-01), Berg et al.
patent: 7451686 (2008-11-01), Graeve et al.
patent: 7597168 (2009-10-01), Anderson et al.
patent: 2001/0004032 (2001-06-01), Zenker et al.
patent: 2008/0053742 (2008-03-01), Hublart et al.
patent: 2008/0116001 (2008-05-01), Graeve et al.
patent: 2008/0271941 (2008-11-01), Young et al.
Boehler Anne Marie
Deere & Company
LandOfFree
Steering control system combining electro-hydraulic and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Steering control system combining electro-hydraulic and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Steering control system combining electro-hydraulic and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4287845