| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection control device capable of detecting minimum intervals for enabling execution of a plurality of injections separately even without a fuel pressure sensor.SOLUTION: A fuel injection control device (6) of an internal combustion engine (1), which is provided with rotating speed detection means (18) for detecting a rotating speed of the internal combustion engine, comprises: implementation-condition determination means for determining whether an implementation condition for implementing a learning injection in which an injector (5) executes a front-stage injection and a rear-stage injection at predetermined intervals is satisfied; learning-injection instruction means for instructing the injector to implement the learning injection; rotating-speed-variation calculation means for calculating a variation of a rotating speed by the front-stage injection and the rear-stage injection; rotating-speed-variation determination means for determining whether the variation of the rotating speed is greater than a first threshold; and minimum-interval detection means for detecting the predetermined intervals as minimum intervals when it is determined that the variation of the rotating speed is greater than the first threshold.SELECTED DRAWING: Figure 4 |
