INTERNAL COMBUSTION ENGINE CONTROL METHOD AND INTERNAL COMBUSTION ENGINE CONTROL DEVICE

An internal combustion engine includes: a turbocharger including a compressor and an exhaust turbine; a wastegate valve for allowing a part of exhaust gas to bypass the exhaust turbine and flow into a downstream side of the exhaust turbine, wherein the exhaust gas is to be brought into the exhaust turbine; and an exhaust adjustment mechanism for adjusting a quantity of the exhaust gas. A control method includes operating a first one of the wastegate valve and the exhaust adjustment mechanism with higher priority to a second one of the wastegate valve and the exhaust adjustment mechanism in response to a condition where an intake air quantity is to be varied along with a variation in engine load or air fuel ratio, wherein operation of the first one allows thermal energy to be recovered more efficiently under the condition than that of the second one.