초록 ▼

An intake air amount-estimating apparatus for an internal combustion engine estimates an amount Gc of intake air actually drawn into a combustion chamber, based on a model formulated on an intake passage in which a portion of the intake passage extending from a throttle valve to each of the combusti

An intake air amount-estimating apparatus for an internal combustion engine estimates an amount Gc of intake air actually drawn into a combustion chamber, based on a model formulated on an intake passage in which a portion of the intake passage extending from a throttle valve to each of the combustion chamber is regarded as a chamber. A value Gc′of the intake air amount in a steady operating condition is determined at least based on engine rotational speed and pressure within the chamber. An effective opening area A of the throttle valve is determined at least based on throttle valve opening and the pressure within the chamber. A first-order delay value ADELAY of the effective opening area of the throttle valve is determined. The intake air amount value Gc′is corrected to calculate the amount Gc by an equation of Gc=Gc′×(A/ADELAY). The ADELAY value is calculated by the use of a correction value for use in calculating the ADELAY value, which is set in a manner depending on a detected change in the amount of air charged in the chamber.

대표청구항 ▼

An intake air amount-estimating apparatus for an internal combustion engine having an intake passage, a throttle valve arranged in said intake passage, and at least one combustion chamber, said intake air amount-estimating device estimating an amount Gc of intake air actually drawn into each of said

An intake air amount-estimating apparatus for an internal combustion engine having an intake passage, a throttle valve arranged in said intake passage, and at least one combustion chamber, said intake air amount-estimating device estimating an amount Gc of intake air actually drawn into each of said at least one combustion chamber of said engine, based on a model formulated on said intake passage in which a portion of said intake passage extending from said throttle valve to said each of said at least one combustion chamber is regarded as a chamber, said intake air amount-estimating apparatus comprising: operating condition-detecting means for detecting operating parameters of said engine including rotational speed of said engine, a degree of opening of said throttle valve, and pressure within said chamber; intake air amount value-determining means for determining a value GC′of said amount of intake air in a steady operating condition of said engine, at least based on said rotational speed of said engine and said pressure within said chamber detected by said operating condition-detecting means; effective opening area-determining means for determining an effective opening area A of said throttle valve, at least based on said degree of opening of said throttle valve and said pressure within said chamber detected by said operating condition-detecting means; first-order delay value-determining means for determining a first-order delay value ADELAY of said effective opening area of said throttle valve; and intake air amount value-correcting means for correcting said value Gc′of said amount of intake air in said steady operating condition of said engine by a ratio of said effective opening area A of said throttle valve to said first-order delay value ADELAY of said effective opening area of said throttle valve by the use of the following equation: Gc=Gc′×(A/ADELAY) to thereby calculate said amount Gc of intake air actually drawn into said combustion chamber, wherein said first-order delay value-calculating means comprises: change-detecting means for detecting a change in an amount of air charged in said chamber; setting means for setting a correction value for use in calculating a first-order delay value of said degree of opening of said throttle valve, in a manner depending on said change in said amount of air charged in said chamber detected by said change-detecting means; and calculating means for calculating said first-order delay value of said effective opening area by the use of said correction value set by said setting means.