Method and apparatus for controlling an engine of a vehicle

A method for controlling an engine of a vehicle by a controller, the method comprising:

• determining whether a running time of the engine exceeds a reference driving time;
• based on the running time being less than or equal to the reference driving time, determining a first CO2 emission amount corresponding to the driving time by utilizing a Mass Air Flow (MAF) sensor;
• determining a model CO2 amount based on a first regression model that has correlation data between a combusted fuel amount and a CO2 emission amount of the engine;
• comparing the first CO2 emission amount with the model CO2 amount;
• determining a correction factor to adjust the first regression model based on comparing the first CO2 emission amount with the model CO2 amount;
• applying the correction factor to the first regression model to thereby generate a second regression model;
• determining a second CO2 emission amount through the second regression model;
• and
• controlling the engine based on the second CO2 emission amount.