Patent ID: 7530347
Filing Date: 2009-05-12
Classification: F02D

Abstract:
1. An air amount computing unit of an internal combustion engine, comprising: air amount detecting means for detecting an air amount passing through an intake throttle section of the internal combustion engine; air amount computing means for obtaining a calculated value of the air amount passing through the intake throttle section from a throttle opening; means for obtaining an air amount flowing into a cylinder of the internal combustion engine by excluding an air amount filled into an intake manifold by filtering by a difference between a value of the air amount passing through the intake throttle section of this time and a previous filtering value; a first filter based on the air amount detected by the air amount detecting means; a second filter based on the calculated value of the air amount obtained by the air amount computing means; selecting means for selecting an input value and a previous output value of the first filter when the internal combustion engine is in a static state and selecting an input value and a previous output value of the second filter when the internal combustion engine is in a transient state; and a third filter for inputting a selected value selected by said selecting means; wherein the output of the third filter is determined to be the air amount flowing into the cylinder.