| 摘要 |
PURPOSE:To control a swash plate angle to an optimum position, by controlling the swash plate angle on the basis of an engine speed detection signal and a load change detection signal from a pressure sensor. CONSTITUTION:An engine 1 drives a pump 2. A control part 8, previously having the reference control function of a swash plate angle in an oil hydraulic closed circuit for a speed of the engine 1, provides a function generating a swash plate angle control signal on the basis of a speed detection signal from an engine speed sensor 7 and a load change detection signal from pressure sensors 6a, 6b. For instance, the control part has the reference control function A as shown in the drawing further with a low load side correction range limit line S1 and a high load side correction range limit line S2, using no range of about 0-4 deg. in bad HST efficiency. |
