| 摘要 |
PROBLEM TO BE SOLVED: To precisely calculate amount of air filled into a cylinder of an engine without using a map. SOLUTION: A relational expression for approximating relation of amount Mc of air filled into the cylinder, rotation speed Ne of the engine, pressure Pm of a suction pipe, and valve timing VT is set, for example, as follows. Mc = a x Pm<SP>2</SP>+ b x Pm + c x Ne<SP>2</SP>+ d x Ne + e x VT<SP>2</SP>+ f x VT + g. Rotation speed Ne of the engine detected by each sensor during engine operation, pressure Pm of the suction pipe, and the valve timing VT are substituted into the relational expression to calculate amount Mc of air filled into the cylinder. Coefficients a to g of the relational expression are calculated and updated to correct characteristic of the relational expression automatically so that error between a calculated value Mc of amount of air filled into the cylinder calculated by substituting rotation speed Ne of the engine detected by each sensor during steady operation, pressure Pm of the suction pipe, and the valve timing VT into the relational expression and a detected value Mcafm of the amount of air filled into the cylinder detected by an air flow meter 14 during steady operation becomes the minimum value. COPYRIGHT: (C)2006,JPO&NCIPI
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