| 摘要 |
PURPOSE:To compensate variations of oil temperature and duct resistance and to obtain always an accurate output oil pressure by taking out an actual output oil pressure as the detection voltage and comparing it with a desired output oil pressure and issuing a compensating increase/reduction voltage command to correct the output oil pressure to the desired pressure. CONSTITUTION:The oil pressure from a hydraulic pump or the like is transmitted to a pressure control object 1 through an electromagnetic proportional pressure control velve 3. A command voltage from a controller 5 is sent to the control valve 3. The control valve 3 controls the degree of opening of an orifice in accordance with the command voltage, and the discharge of a high-pressure oil from the hydraulic pump or the like is changed to change the oil pressure to the object 1 in proportion to the command voltage. The object 1 is provided with a pressure detector 7, and the actual oil pressure detected by this detector 7 is introduced as the detection voltage to a controller 5. The controller 5 receives the detection voltage and compares the actual pressure converted from the detection voltage with a desired pressure and issues a correcting command voltage to the contorl valve 3 if necessary. |
