Bosch Corporation

Atsushi Hoshino

Shouta Tashiro

The invention realizes fuel microinjection volume correction with high degrees of accuracy, stability, and reliability regardless of a configuration of a transmission. In fuel microinjection volume correction control in which microinjection is performed as fuel injection in a microinjection volume and in which deviations in a fuel injection volume resulting from deviations in an injection characteristic of a fuel injection valve are corrected on the basis of a difference between a reference energizing time and an energizing time for the microinjection that is acquired on the basis of a fluctuation amount of an engine speed generated at the time, when the energizing time for the microinjection is acquired on the basis of the fluctuation amount of the engine speed, the fluctuation amount of the engine speed is corrected on the basis of a gear ratio and the engine speed so as to eliminate an unnecessary change that occurs to the fluctuation amount of the engine speed due to a gear shift operation of the transmission. In this way, the accuracy of the fuel microinjection volume correction can be improved.

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Saitama, Japan

Atsushi Hoshino