| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the operability of a combined shovel by accurately grasping a change in the number of revolutions of an engine such as a change caused by load fluctuation, and accurately reflecting a change on a swing speed. <P>SOLUTION: The combined shovel makes a hydraulic actuator driven by pressure oil from a hydraulic pump employing the engine as a power source, and makes a revolving superstructure driven to be revolved by a slewing motor. In the combined shovel, the actual number of revolutions of the engine is detected; low-pass filter processing is applied to the detected actual number of revolutions of the engine; and subsequently, the number of revolutions of the slewing motor is controlled in the direction of decreasing the swing speed in accordance with the decrease of the actual number of revolutions of the engine. <P>COPYRIGHT: (C)2010,JPO&INPIT |
