Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Reexamination Certificate
2007-09-14
2009-06-23
Fábián-Kovács, Árpád (Department: 3671)
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
C060S448000, C060S449000
Reexamination Certificate
active
07549287
ABSTRACT:
A hydrostatic system and method of operation thereof, wherein at least one of a fluid motor and a pump of the system has a displacement which is variable for controlling a speed of operation of the motor, the pump being driven by an engine, and a controller configured for monitoring the speed of operation of the motor and an operating characteristic of the engine and automatically controlling the displacement responsive thereto, wherein if the operating characteristic is indicative of engine performance above a predetermined threshold, the controller will control the displacement for maintaining the speed of operation of the motor at about a predetermined value, and, if the operating characteristic is indicative of engine performance below the threshold, the controller will hold the displacement at a constant value. As a result, the controller can prevent the system from further decreasing the engine performance. And, if the engine performance increases to that or another threshold, the controller will automatically switch back to controlling the displacement for holding the motor speed at the predetermined value, optionally including to incrementally increase the speed to the predetermined value.
REFERENCES:
patent: 3783611 (1974-01-01), Bohas
patent: 3785754 (1974-01-01), Miller
patent: 3841795 (1974-10-01), Ferre et al.
patent: 3890782 (1975-06-01), Wauson
patent: 4168612 (1979-09-01), Nikolaus
patent: 4351152 (1982-09-01), Reynolds et al.
patent: 4745746 (1988-05-01), Geringer
patent: 4920748 (1990-05-01), Kordak et al.
patent: 5121603 (1992-06-01), Widemann
patent: 5203168 (1993-04-01), Oshina et al.
patent: 5576962 (1996-11-01), Ferguson et al.
patent: 5684694 (1997-11-01), Ishino et al.
patent: 5791128 (1998-08-01), Rogalsky
patent: 5823072 (1998-10-01), Legner
patent: 6033188 (2000-03-01), Baldus et al.
patent: 6131391 (2000-10-01), Poorman
patent: 6375433 (2002-04-01), Du et al.
patent: 6675577 (2004-01-01), Evans
patent: 7130721 (2006-10-01), Wear et al.
patent: 2001/0035014 (2001-11-01), Yano et al.
patent: 2002/0176784 (2002-11-01), Du
patent: 2004/0079077 (2004-04-01), Yano et al.
patent: 2004/0261407 (2004-12-01), Du
patent: 2005/0129533 (2005-06-01), Yano et al.
patent: 2005/0279070 (2005-12-01), Pirro et al.
patent: 2007/0130931 (2007-06-01), Burgart et al.
patent: 9220921 (1992-11-01), None
Fackler Robert L.
Foster Christopher A.
Ringwald Justin
Strosser Richard P.
CNH America LLC
Fábián-Kovács Árpád
Harms Michael G.
Sheldrake Patrick M.
Stader John William
LandOfFree
Hydrostatic auto/manual speed control does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydrostatic auto/manual speed control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydrostatic auto/manual speed control will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4101590