| 摘要 |
PROBLEM TO BE SOLVED: To obtain maximum capacity based on a working mode by adjusting the critical capacity of a crane on the basis of changeover between boom hoisting and luffing modes. SOLUTION: A selected working mode is discriminated, and in the case of a boom hoisting mode being selected (S201), after emergency processing (S202), an adjustment to the critical value of the boom hoisting mode is made on the basis of data on the critical capacity value (S203). The emergency processing means the danger avoiding processing in the case of working in the state of exceeding the critical capacity of the boom hoisting mode when changing over to the boom hoisting mode from a luffing mode. In the case of the boom hoisting mode not being selected as the working mode, whether the luffing mode is selected or not is discriminated (S204). In the case of the luffing mode being selected, the state of a boom hoisting action detection signal is discriminated (S205). In the case of not OFF, after emergency processing (S202), an adjustment to the critical capacity of the boom hoisting mode is made. In the case of OFF, an adjustment to the critical capacity of the luffing mode is safely made (S206).
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