Engine system and control method for engine system

An engine system comprising:

• an internal combustion engine;
• a forced induction device having a compressor arranged in an intake passage of the engine, the compressor pressurizes and delivers intake air;
• an ejector device including:
• a drive gas passage connected to the intake passage in a manner bypassing the compressor, and an ejector arranged in the drive gas passage;
• a blow-by gas passage communicating between an interior of a crankcase of the engine and an interior of the ejector;
• and
• a controller configured to execute a temperature raising control by:
• determining whether condensate water is likely to freeze in the ejector device based on one of:
• an outside air temperature around the engine, an intake air temperature in the intake passage, or a gas temperature in the ejector device;
• in response to determining that the condensate water is likely to freeze, increasing intake air pressure in a downstream portion of the intake passage with respect to the compressor;
• and
• adjusting an intake air amount of the engine that limits increase of the intake air amount caused by the increase in the intake air pressure in the downstream portion of the intake passage.