| 摘要 |
<p>PCT No. PCT/FR80/00006 Sec. 371 Date Sep. 18, 1980 Sec. 102(e) Date Sep. 15, 1980 PCT Filed Jan. 17, 1980 PCT Pub. No. W080/01502 PCT Pub. Date Jul. 24, 1980.An electromagnetic coil 29 exerts an attractive force on a movable plate 30 of magnetic material, within which is mounted a ball 32 of non-magnetic material blocking the end of a passage 33 for the hydraulic fluid. The apparatus also comprises electronic means for supplying the coil 29 by means of a pulsed unidirectional current, the mark/space ratio and mean value of which are subject to control by an operating magnitude represented by an electric control signal. The apparatus can be utilized as a hydraulic potentiometer for the determination of a control pressure proportional to an electric control signal in a hydraulic control circuit of an automatic transmission of industrial vehicles.</p> |
