Patent ID: 9657569
Date: 2017-05-23
CPC Classifications: B29C,F01B

Claim:
1. A hydraulic source control device comprising: a hydraulic pump that discharges a working fluid to a hydraulic circuit; an operation input device capable of inputting a driving force as an operation condition of a fluid pressure control element of which the driving is controlled by the working fluid discharged from the hydraulic pump; a servo motor including a motor section that drives the hydraulic pump and an amplifier that drives this motor section; and a control device that is configured to output a control command to the servo motor based on an input result to the operation input device, wherein the control device includes a storage section and a limit torque computing device, wherein the storage section stores a relationship between an operating fluid pressure of the hydraulic circuit and the output torque of the motor section for obtaining the operating fluid pressure, the relationship being obtained in advance using hydrodynamic theoretical calculation expressions by modeling a system of the hydraulic circuit or being obtained in advance experimentally, wherein the limit torque computing device is configured to obtain the operating fluid pressure that is required in order to output the driving force from the fluid pressure control element, based on the driving force of the fluid pressure control element input from the operation input device, and wherein the limit torque computing device is configured to compute the output torque of the motor section based on the relationship between the operating fluid pressure of hydraulic circuit and the output torque of the motor section that is stored in the storage section, wherein the control device outputs the output torque computed by the limit torque computing device to the amplifier as a control command of an upper limit of the output torque of the servo motor, and wherein the amplifier is configured to limit the output torque of the servo motor so as to not exceed the upper limit based on the control command of the upper limit of the output torque.