| 摘要 |
PROBLEM TO BE SOLVED: To improve estimation accuracy of the air volume filling a cylinder. SOLUTION: Density ρm in an intake manifold is calculated (101). A cylinder volume Vivc in an intake valve closing period is multiplied by a throttle coefficient Klft based on an opening area of the intake valve part to calculate effective cylinder volume Vcyl (102-104). A first correction coefficient K1 by intake pulsation with respect to the effective cylinder volume Vcyl, a second correction coefficient K2 by a pressure loss in an intake valve part, and a third correction coefficient K3 by heat transfer through the valve in the intake valve part, are calculated (105-107). The effective cylinder volume Vcyl is multiplied by the first-third correction coefficients K1-K3 to calculate corrected effective cylinder volume Vefe (108, 109). By a product of the density ρm in intake manifold and the corrected effective cylinder volume Vefe, the cylinder filling air quantity Mcyl is calculated (110). COPYRIGHT: (C)2009,JPO&INPIT |
