Patent ID: 7243018

Claim:
A method of identifying noncompliant fuel of a vehicle and improving drivability, comprising the steps of: confirming a present coolant temperature, after the vehicle has been started; setting a coolant temperature factor value, according to the coolant temperature; setting an RPM reference value, according to RPM, after the coolant temperature factor value has been set; determining whether an RPM incremental value reaches the RPM reference value, after the RPM reference value has been set according to RPM; setting a calibration learning value when the RPM incremental value is smaller than the RPM reference value; calculating a learning value of fuel injection volume after the calibration learning value has been set; calculating and conducting fuel injection volume for start injection using the calculated fuel injection volume; determining whether a start state of the vehicle has completed; and calculating and applying fuel injection volume after start injection and fuel injection for acceleration or deceleration, after the start state of the vehicle has completed.