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

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