| 摘要 |
PURPOSE:To improve the damping characteristics of a pump controlling hydraulic circuit, by controlling the displacement volume of an oil pump by use of a differential signal of an integration value based on the deviation between the control quantity of a control lever and the displacement volume of the oil pump and the value of a higher pressure signal. CONSTITUTION:In case that a control lever 17 is pulled from its neutral position in a direction extending a rod 3a of a hydraulic cylinder 3 at a time t0, an inclination angle instructing value X is increased gradually since it is not increased rapidly by the function of an integrator. Thus, since the inclination angle Y of a swash plate is increased gradually, the peak pressure Ppeak of a circuit pressure Pb takes a small value. However, since the fluctuation of the circuit pressure Pb is left free, transient vibration continues for a long time. |
