Patent ID: 7177770

Claim:
An airflow metering device, comprising: a unidirectional airflow sensing device: signally connected to a signal processor, and having an input flow signal correlatable to a magnitude of mass air flowing past the airflow sensing device; and the signal processor; operable to determine a flow correction factor based upon a direction and the magnitude of the mass air flowing past the airflow sensing device; and the airflow metering device having an electrical signal output comprising the input flow signal of the airflow sensing device adjusted by the flow correction factor determined by the signal processor; wherein the signal Processor operable to determine the flow correction factor based upon direction and magnitude of the mass air flowing past the airflow sensing device comprises: an on-board microcontroller including an algorithm operable to determine magnitude of reverse airflow based upon the input flow signal of the airflow sensing device; and wherein the algorithm operable to determine magnitude of reverse airflow based upon the input flow signal of the airflow sensing device comprises: an algorithm operable to: characterize the input flow signal of the airflow sensing device; determine a no pulsing flow mode, a pulse flow mode, an onset of reverse flow mode, or a reverse flow mode based upon the characterized input flow signal; and, select the flow correction factor, based upon the selected flow mode and the characterized input flow signal.