| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce size and weight; to reduce costs; and to obtain a high power. <P>SOLUTION: This power system control unit for construction machines comprises: one electric motor/generator 22 which can selectively perform an operation of an electric motor driven to rotate by an engine 21 so as to convert mechanical energy of rotation into electrical energy and supply it to a battery 25, and an operation of an electric motor for assisting torque, which converts the electrical energy, received from the battery 25, into mechanical energy so as to supply it to a hydraulic pump 23; and a control means 24 which detects load fluctuations of the engine 21 so as to perform switching between the operations of the electric motor/generator 22. In the power system control unit, the switching in the control means 24 makes the electric motor/generator 22 operate as the electric motor for assisting the torque of the engine 21 in the heavy-load operation of the engine, and makes the electric motor/generator 22 operate the generator by the surplus torque of the engine 21 in the light-load operation of the engine 21. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
