发明名称 |
CONSTRUCTION MACHINE |
摘要 |
A construction machine includes: a swing structure (1d); an electric motor (16) that drives the swing structure; an operating device (4b) that outputs an operating signal according to an operating amount and an operating direction; an inverter device (13) that controls the electric motor based on a control signal generated based on the operating signal; a position sensor (24) that detects an actual speed of the electric motor; and a second controller (22) that determines whether at least one of a first condition and a second condition is satisfied. The first condition is satisfied when a sign of a value computed by subtracting the actual speed V from a target speed V* of the electric motor that defined by the control signal; and the second condition is satisfied when a difference between the target speed and the actual speed is greater than a reference value Vth, and when the acceleration is greater than a reference value ²th. This prevents erroneous determination and failure of detection relating to determination of faults in an electronic control system from occurring. |
申请公布号 |
KR20140043076(A) |
申请公布日期 |
2014.04.08 |
申请号 |
KR20137030654 |
申请日期 |
2012.05.30 |
申请人 |
HITACHI CONSTRUCTION MACHINERY CO., LTD. |
发明人 |
OGAWA TAKASHI;SAKURAI KOHEI;MORITA YUICHIRO |
分类号 |
E02F9/20;E02F9/24;G01R31/34;H02P23/00 |
主分类号 |
E02F9/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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