Engine intake system

An intake system of an engine, that is mounted on a vehicle where a cabin is air-conditioned by an air conditioner and supplies intake air to a combustion chamber through an intake passage, the air conditioner including an air passage that guides air to the cabin, a compressor that discharges refrigerant, an evaporator that cools the air by exchanging heat with the refrigerant, and a refrigerant passage through which the refrigerant is circulated through the compressor and the evaporator, wherein a heat exchanger of the evaporator is divided into a first heat exchanger and a second heat exchanger that are mutually independent, and the air passage includes a first division passage where the first heat exchanger is disposed, and a second division passage where the second heat exchanger is disposed, wherein the intake system is configured to cool the intake air utilizing part of the air conditioner, the intake system comprising:

• a connecting passage that guides first air cooled by passing through the first heat exchanger from the first division passage to the intake passage;
• a passage switch that switches a flow direction of the first air to the air passage or the intake passage;
• and
• a controller having a processor configured to execute:
• a passage switchover controlling module that controls the passage switch;
• and
• an intake air cooling demand determining module that determines the existence of a cooling demand for the intake air based on an operating state of the engine,
• wherein when the controller determines that there is the cooling demand for the intake air, the controller controls the passage switch so that the first air flows into the intake passage through the connecting passage, and when the controller determines that there is no cooling demand for the intake air, the controller controls the passage switch so that the first air flows into the first division passage.