PURPOSE: To improve the workability of a device for driving hydraulic closed-circuit by providing the closed-circuit with a pressure detection means detecting a load pressure and a load direction discriminating means, and outputting a direction command value and a discharge amount compensating value according to these means.
CONSTITUTION: Pressure detecting means 4, 5 are provided on a hydraulic closed-circuit. The outputs from the means 4, 5 and the outputs from an operation command means 6, a means for detecting a number of revolutions 7 and a temperature detecting means 8 are input in a control means 9. A load direction discriminating means comprising coefficient multipliers 101, 102, multipliers 102, 104, an adder 105, a function generating means 106 is provided at the same time on the control means 9. It is thus possible to give an optimum compensation amount corresponding to the amount leaking from the inside of a variable capacity hydraulic pump 1 irrespective of the change in a load pressure acting on a hydraulic actuator 3, and the workability of a drive unit can therefore be improved.
UNO KEIICHIRO
YASUDA TOMOHIKO
| JPS58166103A | 1983-10-01 |