| 摘要 |
<p>PURPOSE:To enable quiet trawling by keeping hydraulic pressure delivery to a hydraulic clutch lower than a hydraulic pressure upper limit in the upper limit range of outputted number of revolutions for trawling. CONSTITUTION:A control circuit 17 when a control means '9' carries out an intensifying control, makes judgement on an upper limit judgement means 'l'as to whether a hydraulic pressure value detected by a detecting means 'j' exceeds the upper limit of hydraulic pressure for trawling in a memory means 'k' corresponding to the outputted number of revolutions from a detecting means 'h'. If said hydraulic pressure value is over the upper limit, an intensification- killing means 'm' stops a further intensifying operation on a pressure regulation means 'f'. Also, when a lower limit value judgement means 'n' has found that the set value of the outputted number of revolutions on a setting means 'C' is below a lower limit for enabling trawling, an intermittent boosting means 'o' causes the regulated pressure on a pressure regulation means 'f' for a hydraulic clutch 'e' to fluctuate alternately into hydraulic pressure permitting a half- released clutch and a fully released clutch, thereby enabling a less noisy and extremely low speed trawling operation.</p> |
