Engine device

An engine device comprising:

• an engine that has a throttle valve disposed in an intake pipe and a fuel injection valve and outputs power using fuel supplied from a fuel tank;
• a turbocharger having a compressor disposed in the intake pipe, upstream of the throttle valve;
• an evaporated fuel processing device having
• a supply passage that splits into a first purge passage and a second purge passage that are connected to the intake pipe, downstream of the throttle valve, and supplies evaporated fuel gas containing evaporated fuel generated inside the fuel tank to the intake pipe,
• an ejector having an intake port connected to a recirculation passage extending from the intake pipe, between the compressor and the throttle valve, an exhaust port connected to the intake pipe, upstream of the compressor, and a suction port connected to the second purge passage, and
• a purge control vale provided in the supply passage;
• an air-fuel ratio sensor mounted on an exhaust pipe of the engine;
• and
• a controller configured to control the fuel injection valve by setting a required injection amount using a required load factor of the engine and a purge correction amount that is based on a purge concentration-related value related to a concentration of the evaporated fuel gas, control the purge control valve using a driving duty based on a required purge ratio while a purge of supplying the evaporated fuel gas to the intake pipe is executed, and learn, during execution of the purge, the purge concentration-related value based on an air-fuel ratio deviation that is a deviation of an air-fuel ratio detected by the air-fuel ratio sensor from a required air-fuel ratio, wherein
• the controller is configured to estimate certainty of the purge concentration-related value using a first counter that reflects a number of times of learning of the purge concentration-related value during a first purge of supplying the evaporated fuel gas to the intake pipe through the first purge passage and that does not reflect a number of times of learning of the purge concentration-related value during a second purge of supplying the evaporated fuel gas to the intake pipe through the second purge passage.