Cooling apparatus for turbocharged engine

A cooling apparatus for a turbocharged engine, the turbocharged engine including:

• a cylinder head including an exhaust port;
• a turbocharger including a compressor disposed in an intake passage, and a turbine disposed on a downstream side of the exhaust port in an exhaust passage including a passage in the exhaust port;
• and
• an intercooler disposed on a downstream side of the compressor in the intake passage,
• the cooling apparatus comprising:
• a high-temperature-side cooling circuit including a high-temperature-side pump configured to circulate a high-temperature coolant and a high-temperature-side cooling portion configured to cool the high-temperature coolant, the high-temperature-side cooling circuit being configured to supply the high-temperature coolant to the cylinder head;
• a low-temperature-side cooling circuit including a low-temperature-side pump configured to circulate a low-temperature coolant and a low-temperature-side cooling portion configured to cool the low-temperature coolant, the low-temperature-side cooling circuit being configured to supply the low-temperature coolant to the intercooler;
• and
• an electronic control unit,
• wherein the high-temperature-side cooling portion and the low-temperature-side cooling portion are shared at least in part,
• wherein the high-temperature-side cooling circuit includes,
• a first coolant passage where the high-temperature coolant flows around the exhaust port,
• a second coolant passage where the high-temperature coolant flows through the cylinder head without flowing around the exhaust port, and
• a flow rate adjustment valve configured to adjust a flow rate of the high-temperature coolant flowing through the first coolant passage, and
• wherein the electronic control unit is configured to, in at least a part of an accelerating period from a start of acceleration of a vehicle including the turbocharged engine to an end of the acceleration, execute a response improvement process for controlling the flow rate adjustment valve to reduce the flow rate of the high-temperature coolant flowing through the first coolant passage, and for controlling the low-temperature-side pump to increase a flow rate of the low-temperature coolant circulating through the low-temperature-side cooling circuit.