| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a construction machinery in which a production efficiency of regenerative energy can be improved.SOLUTION: In a step S2, it is determined whether a mathematical expression of R×P<R×Pis satisfied or not. When it is determined, in the step S2, that the mathematical expression of R×P<R×Pis not satisfied, a solenoid valve 79 is kept closed in a step S11. When it is determined in the step S2 on the other hand, that the mathematical expression of R×P<R×Pis satisfied, the solenoid valve 79 is released in a next step S3. This enables a regenerative energy generated by a power generator to be prevented from decreasing. The term R×Pcorresponds to an energy got by return oil of high pressure, whereas the term R×Pcorresponds to energy got under confluence of return oil of high pressure and return oil of low pressure.</p> |
