| 摘要 |
In a power-transmission control mechanism for controlling transmission of power from an internal combustion engine 10 of a lawn mower to mowing blades 12 , a controller for an electromagnetic clutch 20 periodically repeats: reading detected engine rotational speed N during a predetermined time t, when an operating switch is turned on; comparing present engine rotational speed N read in the present cycle with previous engine rotational speed No read in the previous cycle; engaging the electromagnetic clutch 20 when the present engine rotational speed N is equal to or higher than the previous engine rotational speed No; and disengaging the electromagnetic clutch 20 when the present engine rotational speed N is lower than the previous engine rotational speed No. Thus it is possible to reliably transmit the power of the internal combustion engine to the mowing blades by using the electromagnetic clutch without occurrence of engine stall and without being influenced by the load following characteristic of the engine, the clutch, and load fluctuation.
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