Hydraulic driving control device and hydraulic shovel with the control device

A hydraulic operation controlling unit, comprising:

• an engine;
• a hydraulic pump that is operated by this engine;
• a hydraulic actuator that is operated by pressurized oil that is discharged from this hydraulic pump;
• an engine controlling means for controlling an output of said engine;
• and a hydraulic pump absorbing torque controlling means for controlling an absorbing torque of said hydraulic pump, wherein
• a matching point where the output torque of said engine and the absorbing torque of said hydraulic pump coincide with each other is predetermined in accordance with work contents, said engine controlling means controls the output of said engine in such a manner that output properties of said engine become equi-horsepower properties or approximately equi-horsepower properties in a predetermined range of the engine speed which includes an engine speed that corresponds to said matching point, and said hydraulic pump absorbing torque controlling means controls the absorbing torque of said hydraulic pump in such a manner that the output torque of said engine that corresponds to said matching point and the absorbing torque of said hydraulic pump are made to coincide with each other by increasing or reducing the absorbing torque of said hydraulic pump in accordance with an increase and a decrease in the engine speed.