Pulsating Flow Characteristics of Hot-Wire Air Flow Meter for Gasoline Fuel-Injection System

Pulsating flow characteristics of hot-wire air flow meters for gasoline fuelinjection systems were investigated to analyze simple methods of measuring data processing. It was clarified that backward flow components due to pulsation are detected as forward flow by the probe in the conventional meters, increasing errors. The errors due to pulsation can be reduced by using a meter with a hot-wire probe located in a bypass passage, compensating aerodynamically forward and backward flow components.