Patent ID: 6697743
Filing Date: 2004-02-24
Classification: F02D,G01F

Abstract:
An apparatus for measuring an intake air flow of an internal combustion engine by using an output electrical signal of a flow detecting means, comprising:flow converting means for converting said output electric signal of the flow detecting means into a mass of the flow; backflow determining means for determining presence of a backflow based on the output electric signal of the flow detecting means; kurtosis calculating means for calculating a kurtosis of a distribution of the output electric signal from the flow detecting means when a backflow is determined to be present by the backflow determining means; backflow ratio calculating means for calculating a backflow ratio based on the kurtosis calculated by the kurtosis calculating means; and flow calculating means for integrating or averaging instantaneous mass of the air flows converted from the output electric signals of the flow detecting means by the flow converting means, and for calculating the real mass of the air flow by compensating the integrated or the average with the backflow ratio.