| 摘要 |
PURPOSE:To carry out energy-saving operation, by calculating the reference operating inclination of a hydraulic pump based on the revolution number of a hydraulic motor, and changing the operating inclination of the hydraulic pump in a range that preset operating inclination varying limit width is added to or subtracted from the reference operating inclination so as to prevent the occurrence of a peak pressure. CONSTITUTION:The revolution number of a hydraulic motor 4 is detected by a revolution number detector 20, and the reference operating inclination theta of a variable capacity hydraulic pump 3 is calculated by a reference operating inclination arithmetic circuit 21 based on the detected value of the detector, while limit width alpha preset to an operating inclination varying limit width setting device is added to or subtracted from the reference operating inclination theta and a range theta+alpha-theta-alpha in which operating inclination can be changed is calculated. As the operating inclination of the variable capacity hydraulic pump 3 is varied in this range and this range also is varied gradually by the variation of the revolution number of the hydraulic motor 4, the operating inclination of the variable capacity hydraulic pump 3 does not change sharply and a peak pressure above a set pressure does not occur, so that wasteful energy consumption is not generated.
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