Rotary servo valve and guidance system apparatus for controlling

Details Rotary servo valve and guidance system apparatus for controlling Rotary servo valve and guidance system apparatus for controlling

1994-05-23

1996-06-11

Lopez, F. Daniel

Motors: expansible chamber type

Relatively movable working members with one having motive...

Single valve unit controlling plural working chambers

137270, 13762522, 251290, F01L 3304

Patent

active

055245250

ABSTRACT:
A guidance control system for trailing implements attached to a tractor is disclosed. The system can function to steer the implement in a row crop, for example, and can also steer the tractor. A proportional servo valve having a rotatable spool is disclosed, which valve can be controlled to operate in an open center or closed center modes of operation.

REFERENCES:
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patent: 4469342 (1984-09-01), Millard
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patent: 4858650 (1989-08-01), Devaud et al.
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patent: 5048567 (1991-09-01), Noguchi et al.
patent: 5107752 (1992-04-01), Elser et al.
patent: 5240079 (1993-08-01), Schmidt

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