Apparatus and method for detecting intake air quantity for internal combustion engine

A method for detecting an intake air quantity for an internal combustion engine and controlling a fuel supply quantity on the basis of the detected intake air quantity, comprising the steps of:

• a) detecting a change in a value of a resistance of a temperature-sensitive resistor disposed in an intake air passage of the engine according to an intake airflow quantity through the intake air passage, and outputting a detection signal corresponding to the intake air quantity of the engine:
• b) measuring a time interval upon a turn on of a power supply to the temperature-sensitive airflow meter;
• c) calculating a change rate between a detection value of the intake air quantity before a predetermined period of time and a present detection value by means of the temperature-sensitive airflow meter;
• d) outputting a signal representing a present final detection value of the intake air quantity, said present final detection value being derived by an addition of a value of the change rate calculated in the step c) multiplied by a predetermined coefficient to the present detection value, the predetermined coefficient being variably set according to the measured time interval;
• and
• e) controlling a fuel quantity supplied to the engine on the basis of said signal representing said Present final detection value of the intake air flow quantity output in said step d).