| 摘要 |
PROBLEM TO BE SOLVED: To provide a controller for a construction machine which enables work in either of a low speed work mode and a high speed work mode to be executed when warming-up is completed and traveling of the construction machine is not executed, enables the mutual switching between the low speed work mode and the high speed work mode to be executed, and enables the switching to be stably executed corresponding to a work state in the construction machine in which the work is executed by selecting either of the high speed work mode and the low speed work mode. SOLUTION: The construction machine is composed so as to be capable of switching the work mode to either of the low speed work mode and the high speed work mode. A radiator water temperature sensor or an operating fluid temperature sensor is provided. A pressure switch is provided to the pilot oil passage of a pilot pump. When at least one of the detection values of the radiator water temperature sensor or the operating fluid temperature sensor reaches the warming-up of an engine, and when it is detected that the traveling of the construction machine is not executed by the pressure switch, the work in either of the low speed work mode and the high speed work mode can be executed. The mutual switching of the low speed work mode and the high speed work mode can be executed. Further, the switching of the work mode can be stably executed corresponding to the work state. COPYRIGHT: (C)2005,JPO&NCIPI
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