Engine working machine

An engine working machine comprising:

• an engine;
• an exhaust catalyst disposed on an exhaust path of the engine;
• a fuel supply device that increases or decreases fuel supply volume towards a combustion chamber in response to increase or decrease of an engine load;
• a dummy load device;
• a work load device;
• a load switching device that switches between input and cutoff of a dummy load to and from the engine;
• and
• an electronic control device that controls switching of the load switching device,
• wherein
• when, during input of the dummy load to the engine, the fuel supply volume of the fuel supply device reaches a predetermined dummy load cutoff determination value as a result of elevation of a total load for the engine including the dummy load and a work load, the electronic control device switches the load switching device to cut off the dummy load;
• and
• when, during input of the work load without including the dummy load to the engine, the fuel supply volume of the fuel supply device reaches a predetermined dummy load re-input determination value as a result of decline of the work load, the electronic control device switches the load switching device to re-input the dummy load, and during engine operation, the fuel supply volume is kept at a value exceeding a predetermined set value, so that exhaust temperature at an inlet of the exhaust catalyst is kept at a value exceeding a predetermined set value.