| 摘要 |
PURPOSE: To uniformize a pump load through reduction of the stop and the starting frequency of a subsequent operation pump and a drive source therefor by performing automatic variation so that a difference in a vane angle between a plurality of pumps is held in an allowable angle difference range. CONSTITUTION: When pumps are in an automatic operation mode and brought into a parallel operation mode of two pumps 8A and 8B, it is decided at a step S10 whether or not the absolute value of a difference between the van anglesθ1 andθ2 of the two pumps 8A and 8B is within an allowable difference range 93. When a decision result is not within an allowable angle difference rangeθ3, it is decided at a step S12 by which of the vane anglesθ1 andθ2 of the two pumps 8A and 8B it is caused that an angle difference range exceeds an allowable valueθ3. Based on the decision result, automatic control is performed so that the absolute value of a difference between the two vane angles is held at a value within an allowable angle difference range in such a way that variation is effected in a direction in which the vane anglesθ1 andθ2 of the two pumps 8A and 8B are increased or decreased. This constitution reduces the stop and starting frequency of a subsequent operation pump 8B and a drive source.
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