| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection control device for an internal combustion engine capable of accurately grasping injection characteristics of fuel, and capable of learning at a short time period. SOLUTION: In an ECU 4 for fuel injection control, variation of a sensor output value having a reference at the time when no fuel is injected is stored as reference output variation at a predetermined injection amount, the sensor output value when driving time of an injector 2 is at the predetermined injection amount is estimated based on the reference output variation and the sensor output value at the time when no fuel is injected, a sensor output-drive time characteristic line in an injection region is estimated by calculating the sensor output value in a plurality of driving time periods regarding an injection period, the driving time corresponding to the estimated sensor output value is calculated on the characteristic line, and the driving time is corrected so that the driving time is given when the predetermined injection amount is required as an injection command. The predetermined injection amount is set to an injection amount region wherein precise amount adjusting accuracy is required such as pilot injection, and thereby the amount adjusting accuracy can be selectively improved at the injection amount region. COPYRIGHT: (C)2004,JPO |
