Patent ID: 9488140
Filing Date: 2016-11-08
CPC Classification: F02D,F02M,G01F

Claim Text:
1. An intake air volume measuring device for an internal combustion engine, said device comprising an air flow meter located in an intake air path of the internal combustion engine, to measure a volume of intake air sucked into a combustion chamber of the internal combustion engine based on an output signal of the air flow meter, and the output signal of the air flow meter being sampled in synchronism with a crank angle of the internal combustion engine, wherein an average of sets of data obtained by sampling the output signal of the air flow meter in synchronism with a crank angle of the internal combustion engine is calculated to obtain an average flow rate of the intake air, wherein the crank angle intervals, at which the output signal of the air flow meter is sampled, are switched according to the number of engine revolutions of the internal combustion engine, wherein the crank angle intervals are set to a greater value for a relatively large number of engine revolutions of the internal combustion engine than for a relatively small number of engine revolutions of the internal combustion engine, and wherein when the crank angle intervals are to be switched, if the crank angle intervals have a pre-switching value and a post-switching value such that either one of the pre-switching and post-switching values is a multiple of the other, sampling values obtained with a greater one of the pre-switching and post-switching values are used to calculate the average.