| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a construction machine including an insulation resistance deterioration detecting device which can detect and determine insulation resistance deterioration with a simple circuit structure. <P>SOLUTION: The construction machine includes an electric motor, an inverter for delivering/receiving electric power to/from the electric motor, a power storage device, a chopper for boosting the voltage of the power storage device and supplying it to the bus bar of the inverter, and an electric circuit and a controller for driving and controlling them. It further includes voltage detecting means for detecting the voltage of the power storage device, the insulation resistance deterioration detecting device having two resistors connected at their one-end sides to the positive and negative electrodes of the bus bar of the inverter respectively,current detecting means connected at one end to the other-end sides of the two resistors and at the other end to a chassis earth, and a controller for determining the insulation resistance deterioration using a variation of a voltage value of the power storage device detected by the voltage detecting means, and a variation of a signal detected by the current detecting means of the insulation resistance deterioration detecting device. <P>COPYRIGHT: (C)2013,JPO&INPIT |
