Control system of an internal combustion engine

A control system of an internal combustion engine comprising:

• a first fuel injection valve that injects fuel into a cylinder of the internal combustion engine;
• a second fuel injection valve that injects fuel into an intake port of the internal combustion engine;
• a throttle valve that is arranged in an intake passage of the internal combustion engine;
• an EGR passage that introduces an EGR gas from an exhaust passage of the internal combustion engine to the intake passage at a location downstream of said throttle valve;
• an EGR valve that is arranged in the EGR passage;
• an obtaining unit that obtains an amount of intake air in the internal combustion engine;
• a setting unit that sets a target value of a control parameter related to an operating state of said internal combustion engine, according to the amount of intake air obtained by said obtaining unit;
• a determination unit that determines, based on a cylinder injection ratio which is a ratio of an amount of fuel injected from said first fuel injection valve to a total amount of fuel injected from said first fuel injection valve and said second fuel injection valve, whether the amount of intake air is in an increasing tendency or in a decreasing tendency with respect to a change in the cylinder injection ratio, when said EGR valve is open;
• and
• a correction unit that corrects the target value of the control parameter set by said setting unit, according to a result of the determination of said determination unit.

A control system of an internal combustion engine comprising:

• a first fuel injection valve that injects fuel into a cylinder of the internal combustion engine;
• a second fuel injection valve that injects fuel into an intake port of the internal combustion engine;
• a throttle valve that is arranged in an intake passage of the internal combustion engine;
• an EGR passage that introduces an EGR gas from an exhaust passage of the internal combustion engine to the intake passage at a location downstream of said throttle valve;
• an EGR valve that is arranged in the EGR passage;
• a first obtaining unit that obtains an amount of intake air in the internal combustion engine;
• a second obtaining unit that obtains an amount of EGR gas based on the amount of intake air obtained by said first obtaining unit;
• a determination unit that determines, based on a cylinder injection ratio which is a ratio of an amount of fuel injected from said first fuel injection valve to a total amount of fuel injected from said first fuel injection valve and said second fuel injection valve, whether the amount of EGR gas is in an increasing tendency or in a decreasing tendency with respect to a change in the cylinder injection ratio, when said EGR valve is open;
• and
• a correction unit that corrects the amount of EGR gas obtained by said second obtaining unit, according to a result of the determination of said determination unit.