Electro hydraulic control with dead zone compensation
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United States of America Patent
Stats
-
Aug 21, 1984
Grant Date -
N/A
app pub date -
Jan 25, 1982
filing date -
Jan 25, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is directed to an electro hydraulic control system wherein electric current output of the control is applied to an electric force motor to position a valve spool which in turn modulates fluid flow to a device to be controlled. The valve spool, either to accommodate manufacturing tolerance or to assure zero output flow, in the neutral position, has a flow dead zone which requires a substantial valve spool travel to initiate fluid flow through the valve. In the preferred device the manual control handle modulates the current output of the electric circuit which in turn proportionately modulates the position of the valve spool. The electric circuit is provided with resistance means which are selectively inserted into the circuit to assure that sufficient output current is provided to the force motor to move the valve spool that amount necessary to initiate fluid flow upon a small movement of the control handle to compensate for the fluid flow dead zone in said valve.
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