Internal-combustion-engine control device and control method

A control method for fuel injection of an internal combustion engine, the internal combustion engine that is subject to control performed by the control method including a port injection valve that injects fuel into an intake passage, wherein the control method comprises:

• calculating a requested injection amount for controlling an air-fuel ratio to a target air-fuel ratio based on an air amount filling a cylinder of the internal combustion engine;
• and
• operating the port injection valve in order to inject fuel of the requested injection amount, and
• operating the port injection valve includes a multiple injection process for injecting fuel in sequence from an intake asynchronous injection to an intake synchronous injection by splitting the fuel of the requested injection amount so as to variably set a synchronous injection amount and an asynchronous injection amount in accordance with load that is a physical quantity having a correlation with the filling air amount, the synchronous injection amount being an injection amount of the intake synchronous injection of injecting fuel in synchronization with an open period of an intake valve, the asynchronous injection amount being an injection amount of the intake asynchronous injection of injecting fuel at a timing that is more advanced than a timing of the intake synchronous injection.

A non-transitory computer readable medium that stores a program for causing a processor to execute a control process of fuel injection for an internal combustion engine, the internal combustion engine that is subject to control performed by the control process including a port injection valve that injects fuel into an intake passage, wherein the control process includes

• calculating a requested injection amount for controlling an air-fuel ratio to a target air-fuel ratio based on an air amount filling a cylinder of the internal combustion engine, and
• operating the port injection valve in order to inject fuel of the requested injection amount, and
• operating the port injection valve includes a multiple injection process for injecting fuel in sequence from an intake asynchronous injection to an intake synchronous injection by splitting the fuel of the requested injection amount so as to variably set a synchronous injection amount and an asynchronous injection amount in accordance with load that is a physical quantity having a correlation with the filling air amount, the synchronous injection amount being an injection amount of the intake synchronous injection of injecting fuel in synchronization with an open period of an intake valve, the asynchronous injection amount being an injection amount of the intake asynchronous injection of injecting fuel at a timing that is more advanced than a timing of the intake synchronous injection.