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An engine control system is configured to improve the estimation accuracy of a fresh intake air quantity and a total intake air quantity that flows into the combustion chambers. The engine control system is configured to estimate an estimated EGR rate value Regr using a primary lag process for a tar

An engine control system is configured to improve the estimation accuracy of a fresh intake air quantity and a total intake air quantity that flows into the combustion chambers. The engine control system is configured to estimate an estimated EGR rate value Regr using a primary lag process for a target EGR rate, calculate a volumetric efficiency equivalency value based on the estimated EGR rate value Regr, estimate an estimated fresh intake air value Qac that flows into the combustion chamber based on a rate of change in a volumetric efficiency equivalency value Kin/Kinn-1 of the estimated EGR rate value Regr and the volumetric efficiency equivalency value Kin, and estimate an estimated total intake air quantity value Qsco2 that includes the EGR gas based on the estimated fresh intake air value Qac and the estimated EGR rate value Regr.

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What is claimed is: 1. An engine control system comprising: a fresh intake air quantity detection section configured to output a detected value of fresh intake air quantity passing through an air intake passage; an efficiency calculation section configured to calculate a volumetric efficiency equiv

What is claimed is: 1. An engine control system comprising: a fresh intake air quantity detection section configured to output a detected value of fresh intake air quantity passing through an air intake passage; an efficiency calculation section configured to calculate a volumetric efficiency equivalency value; and a fresh intake air quantity estimation section configured to estimate a predicted fresh intake air quantity value that flows into a combustion chamber based on variations in the fresh intake air quantity detected value and the volumetric efficiency equivalency value. 2. The engine control system as recited in claim 1, further comprising an air adjustment section configured to determine an affect in the fresh intake air quantity drawn into the combustion chamber that occurs without changing the detected value of the fresh intake air quantity passing through the air intake passage, and the fresh intake air quantity estimation section being further configured to adjust the calculate the volumetric efficiency equivalency value based on an operating state determined by the air adjustment section. 3. The engine control system as recited in claim 2, wherein the efficiency calculation section is configured to calculate the volumetric efficiency equivalency value as follows: where Kin is the volumetric efficiency equivalency value, Ne is an engine rotation speed (RPM), Rvlv is an adjustable intake valve actual operating equivalent value, Pcol is a supercharging pressure, and Pa is an atmospheric pressure. 4. The engine control system as recited in claim 2, further comprising an EGR control section configured to control EGR towards at least one of a target EGR rate and a target EGR quantity, and an EGR estimation section configured to estimate a predicted EGR value of at least one of an actual EGR rate and an actual EGR quantity based on the at least one of the target EGR rate and the target EGR quantity, the efficiency calculation section being configured to calculate the volumetric efficiency equivalency value based on the predicted EGR value. 5. The engine control system as recited in claim 4, further comprising a total intake air quantity equivalent value estimation section configured to estimate a predicted total intake air quantity equivalent value that flows into the combustion chamber based on the predicted EGR value and the predicted value of fresh intake air quantity. 6. The engine control system as recited in claim 5, further comprising at least one of a compressor of a supercharger and an intercooler disposed in the air intake passage between a fresh intake air quantity detecting device and the combustion chamber. 7. The engine control system as recited in claim 4, further comprising at least one of a compressor of a supercharger and an intercooler disposed in the air intake passage between a fresh intake air quantity detecting device and the combustion chamber. 8. The engine control system as recited in claim 1, further comprising an EGR control section configured to control EGR towards at least one of a target EGR rate and a target EGR quantity, and an EGR estimation section configured to estimate a predicted EGR value of at least one of an actual EGR rate and an actual EGR quantity based on the at least one of the target EGR rate and the target EGR quantity, the efficiency calculation section being configured to calculate the volumetric efficiency equivalency value based on the predicted EGR value. 9. The engine control system as recited in claim 8, further comprising a total intake air quantity equivalent value estimation section configured to estimate a predicted total intake air quantity equivalent value that flows into the combustion chamber based on the predicted EGR value and the predicted value of fresh intake air quantity. 10. The engine control system as recited in claim 9, further comprising at least one of a compressor of a supercharger and an intercooler disposed in the air intake passage between a fresh intake air quantity detecting device and the combustion chamber. 11. The engine control system as recited in claim 8, further comprising at least one of a compressor of a supercharger and an intercooler disposed in the air intake passage between a fresh intake air quantity detecting device and the combustion chamber. 12. The engine control system as recited in claim 1, wherein the efficiency calculation section is configured to calculate the volumetric efficiency equivalency value as follows: where Kin is the volumetric efficiency equivalency value, Ne is an engine rotation speed (RPM), Regr is a predicted EGR rate value, Pcol is a supercharging pressure, and Pa is an atmospheric pressure. 13. The engine control system as recited in claim 1, wherein the fresh intake air quantity estimation section is configured to estimate the predicted value of the fresh intake air quantity as follows: where Qac is the predicted value of fresh intake air quantity drawn into the combustion chamber, Kin is the volumetric efficiency equivalency value, Qacb is a detected intake air quantity value, Qacn-1 is a last calculated value of Qac, Kinn-1 is a last calculated value of Kin, Ne is an engine rotation speed (RPM), Vcol is a collector capacity, Ve is an exhaust quantity, and dT is an calculation interval. 14. The engine control system as recited in claim 1, further comprising an intake valve control section configured to control adjustments of a variable intake valve mechanism, and an intake valve operating state predicting section configured to predict the operating state of the variable intake valve mechanism, the efficiency calculation section being configured to calculate a volumetric efficiency equivalency value based on a predicted operating value of the variable intake valve mechanism. 15. The engine control system as recited in claim 14, wherein the efficiency calculation section is configured to calculate the volumetric efficiency equivalency value as follows: where Kin is the volumetric efficiency equivalency value, Ne is an engine rotation speed (RPM), Rvlv is an adjustable intake valve actual operating equivalent value, Pcol is a supercharging pressure, and Pa is an atmospheric pressure. 16. The engine control system as recited in claim 1, wherein the efficiency calculation section is configured to calculate the volumetric efficiency equivalency value as follows: where Kin is the volumetric efficiency equivalency value, Ne is an engine rotation speed (RPM), Rvlv is an adjustable intake valve actual operating equivalent value, Pcol is a supercharging pressure, and Pa is an atmospheric pressure. 17. An engine control system comprising: fresh intake air quantity detecting means for outputting a detected value of fresh intake air quantity passing through an air intake passage; efficiency calculation means for calculating a volumetric efficiency equivalency value; and fresh intake air quantity estimation means for estimating a predicted fresh intake air quantity value that flows into a combustion chamber based on variations in the fresh intake air quantity detected value and the volumetric efficiency equivalency value. 18. A method of controlling an engine comprising: detecting and outputting a detected value of fresh intake air quantity passing through an air intake passage; calculating a volumetric efficiency equivalency value; and estimating a predicted fresh intake air quantity value that flows into a combustion chamber for controlling an operation of the engine based on the fresh intake air quantity detected value and a variation in the volumetric efficiency equivalency value.