To provide a fuel injection control device for an internal combustion engine capable of suppressing an injection amount dispersion between cylinders in a high-injection area.
An ECU executes an injection amount leaning so as to suppress an injection amount dispersion between cylinders of a diesel engine 1. The injection amount learning is carried out with vehicle speed kept constant by a cruise control device. In the concrete, correction (FCCB correction) is started by fixing an injection pressure command value and an injection amount command value to predetermined values respectively at the point of time when a fixed time elapses after stabilization of the vehicle speed, injection amount and actual rail pressure during the cruise control. In this case, the FCCB correction can be accurately executed even in a high-injection area during travel, whereby the correction vale obtained by the FCCB correction can be reflected in the injection amount of each cylinder as a learning value so as to suppress the injection amount dispersion between cylinders in the high-injection area.
COPYRIGHT: (C)2006,JPO&NCIPI
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Daito Kato
Akira Nagai
Hirohiko Usui