| 摘要 |
A method is provided for measuring a pressure of a hydraulic fluid that is supplied from a hydraulic fluid control device (<bold>1</highlight>) to a operation device (<bold>6</highlight>). The method includes measurement of a first pressure (Pm) and a second pressure (Pa). The first pressure is the pressure of the hydraulic fluid within a first flow path (P<bold>3 </highlight>to P<bold>8</highlight>) connecting a pressure control unit (<bold>3</highlight>) and the operation device. The second pressure is the pressure of the hydraulic fluid within a second flow path (P<bold>11, </highlight>P<bold>12</highlight>) connecting an accumulator (<bold>22</highlight>) and the pressure control unit. Then, a stabilization time (T) is determined. The stabilization time is the time when a pressure gradient per unit time of the second pressure become to be smaller than a predetermined value. Thereafter, a pressure (Pw) of the hydraulic fluid at the operation device is determined based on the first pressure that is measured at the stabilization time or at a time immediately after the stabilization time. This measuring methods can be used for evaluating a condition of the hydraulic fluid.
|
