| 摘要 |
PROBLEM TO BE SOLVED: To accurately estimate a throttle upstream pressure between a compressor and a throttle in an internal combustion engine with a supercharger.SOLUTION: A throttle upstream pressure estimation part calculates an average density &rgr;ave(n) in a region, which consists of a supercharging part from the downstream of a compressor 31 to the upstream of a throttle valve 4 and an intake manifold 5, on the basis of an AFS (Air Flow Sensor) intake air quantity Qa from an AFS 12 and an intake manifold pressure Pb, and estimates a throttle upstream pressure P2 on the basis of the intake manifold pressure Pb and the average density &rgr;ave(n). Further, the throttle upstream pressure estimation part, while learning a relation between a throttle opening TP and an effective opening area CAt, corrects the throttle upstream pressure estimated value (estimation P2) on the basis of the region of throttle opening learning values and dispersion in an error between the throttle opening learning value and an actual throttle opening. |
