Control Device and Control Method of Engine

摘要

It is possible to prevent the stability of an engine from deteriorating even when degrees of changes over time of injection characteristics are different in each fuel injection valve. An inter-cylinder air-fuel ratio variation detection unit 1100 calculates an air-fuel ratio variation index (Ind_imb) which indicates a degree of variation in an air-fuel ratio between cylinders from an exhaust air-fuel ratio, engine rotation speed, or the like. Unlike in a case where the air-fuel ratio variation index (Ind_imb) is lower than a set value, when the air-fuel ratio variation index (Ind_imb) is higher than the set value, a fuel injection pulse width limitation unit 2100 sets a (allowable) minimum value (Min_TI) of a fuel injection pulse width so as to be greater. In addition, a fuel injection pulse width calculation unit 3100 calculates fuel injection pulse widths (TI_1, TI_2, TI_3, and TI_4) of cylinders so as not to be lower than the minimum value (Min_TI).

主权项

1. A control device of an engine,
wherein the engine is a multi-cylinder engine in which a fuel injection valve is provided in each of a plurality of cylinders, and wherein a minimum value of an injection pulse width of the fuel injection valve is limited so as to be more than a predetermined value when variation in an air-fuel ratio between the plurality of cylinders is detected during operation of the multi-cylinder engine.