System and method for controlling fuel injection in flex-fuel vehicle

A system for controlling fuel injection in response to a change in a content of ethanol in a flex-fuel vehicle (FFV) having oxygen sensors and an ethanol sensor for measuring ethanol content of blending fuel, the system comprising:

• an ethanol content change detection unit configured to detect a change in a content of ethanol within blending fuel based on a change in a measured value of the ethanol sensor;
• a flow rate calculation unit configured to calculate a volumetric flow rate of blending fuel injected into a cylinder and to integrate the calculated value when a change in the content of ethanol within the blending fuel is detected by the ethanol content change detection unit;
• a condition determination unit configured to determine whether the change in the content of ethanol detected by the ethanol content change detection unit satisfies a condition for applying a fuel injection correction value;
• a control execution determination unit configured to determine whether to apply the fuel injection correction value by comparing the volumetric flow rate integration value of the flow rate calculation unit with a preset second reference value when the condition for applying the fuel injection correction value is satisfied;
• and
• a controller configured to determine a fuel injection correction value corresponding to a change in the content of ethanol and to adjust an amount of fuel injection by incorporating the determined fuel injection correction value.