| 摘要 |
<p>PURPOSE:To speed up the response, by adding or subtracting the specified valve according to the direction of drive, to the control signal driving the proportional electromagnetic value. CONSTITUTION:The control circuit 16 outputs the deciding signal U/D of two levels and the signal Vx integrating this deciding signal to the driving circuit 17 depending whether the detected value is less or more than the specified value. The driving circuit 17 feeds the signal adding or subtracting a given value to Vx, to the current amplifying circuit 27 from the differential amplifier 23 or 24, depending whether the electromagnetic valve moves from the fully open to the fully closed direction or vice versa. Accordingly, even if the driving coil current and the spool stroke movement are nonlinear, the proportional electromagnetic valve can be driven without causing the delay in response.</p> |
