To capacitance an operator to switch engine speed properly from an indicated speed by a throttle lever to a low speed at the time of suspending work without performing special operation such as switching operation or the like.
When all operating levers 14 to 21 are operated to a neutral position to suspend the work, each individual delat time is set according to whether an operating speed of the operating lever operated to the neutral position lastly is a large operating speed of more than the specified speed or a small operating speed of less than the specified speed. When the delay time is continued and all these operating levers 14 to 21 are held in the neutral position, the revolution of an engine 1 is selected to the specified low speed, and when any operating lever is operated within the delay time, the engine 1 is continuously controlled to an indicated speed by the throttle lever 21. In this connection, the delay time in the case of the small operating speed is longer than that in the case of the large operating speed.
KINUKAWA HIDEKI
TOGO HIROSHI
