Fluid pressure unit and fluid pressure unit control method

A method for controlling a fluid pressure unit including a fixed displacement fluid pump configured to be driven by an adjustable speed motor to discharge fluid and at least one actuator for actuating an object to be actuated with a pressure of the fluid discharged from the fluid pump, the method comprising:

• upon the actuator actuating the object to be actuated, imparting a teaching movement to the actuator to determine an operating range of the actuator based on the number of rotations of the motor;
• and
• during subsequent movement of the actuator to actuate the object to be actuated, rotating the motor at a first speed until a preset deceleration start point short of the end of movement of the actuator within the determined operating range and then rotating the motor at a second speed lower than the first speed from the deceleration start point to the end of movement of the actuator.

A method for controlling a fluid pressure unit including a fixed displacement fluid pump configured to be driven by an adjustable speed motor to discharge fluid and at least one actuator for actuating an object to be actuated with a pressure of the fluid discharged from the fluid pump, the method comprising:

• upon the actuator actuating the object to be actuated, rotating the motor at a first speed until a preset deceleration start point short of the end of movement of the actuator within a predetermined operating range of the actuator and then rotating the motor at a second speed lower than the first speed from the deceleration start point to the end of movement of the actuator;
• and correcting the operating range of the actuator to a small extent when the surge pressure at the end of movement of the actuator is equal to or greater than a set value and correcting the operating range of the actuator to a large extent when the period of time from the deceleration start point to the end of movement of the actuator is equal to or greater than a set value.