ENGINE-DRIVEN WORKING MACHINE

摘要

An engine-driven working machine is provided, in which a time period until the rotation speed limitation mode is canceled can be shortened.;After the throttle valve (10) is moved to a fully-closed position by an operator's operation to allow the engine (2) to finish the fast idling state and while the engine (2) is transited to an idling state, the controller (18) cancels the rotation speed limitation mode by detecting an event that a cycle period of rotation speed variations of the engine (2) is longer than a cycle period of rotation speed variation in the fast idling state.

主权项

1. An engine-driven working machine comprising:
an engine; an actuating part driven by the engine; a centrifugal clutch disposed between the engine and the actuating part; and a controller detecting a rotation speed of the engine to control the rotation speed, wherein when the rotation speed of the engine is higher than a predetermined clutch-in rotation speed, the centrifugal clutch connects the engine with the actuating part so as to transmit rotations of the engine to the actuating part, and wherein in a fast idling state in which the engine is operated while a throttle valve of a carburetor of the engine is maintained in a half-opened position, the controller is operated from starting of the engine in a rotation speed limitation mode in which the engine is prevented from rotating at a rotation speed that is higher than the clutch-in rotation speed, characterized in that wherein after the throttle valve is moved to a fully-closed position by an operator's operation to allow the engine to finish the fast idling state and while the engine is transited to an idling state, the controller cancels the rotation speed limitation mode by detecting an event that a cycle period of rotation speed variations of the engine is longer than a cycle period of rotation speed variation in the fast idling state.