Engine control device

An engine control device for controlling an internal combustion engine including a fuel injection device configured to supply fuel to a cylinder and a throttle valve disposed in an intake air passage, comprising:

• a processor;
• an air flow sensor disposed in the intake air passage upstream of the throttle valve and configured to detect an intake air flow rate;
• and
• a throttle position sensor configured to detect a throttle opening degree of the throttle valve,
• the processor being configured to execute a fuel injection control including:
• a first fuel injection processing to control the fuel injection device so as to inject an amount of fuel according to a first intake air amount based on the intake air flow rate detected by the air flow sensor;
• and
• a second fuel injection processing to control the fuel injection device so as to inject an amount of fuel according to a second intake air amount based on the throttle opening degree detected by the throttle position sensor,
• the processor being configured to:
• select the first fuel injection processing when a pulsation rate being a fluctuation rate of pulsation of the intake air flow rate detected by the air flow sensor is equal to or lower than a pulsation rate threshold value;
• and
• select the second fuel injection processing when the pulsation rate is higher than the pulsation rate threshold value,
• the pulsation rate threshold value being smaller when a temperature correlation value correlated with temperature of the internal combustion engine is low than when the temperature correlation value is high.