Engine control device

The invention relates to an engine control device. The engine control device performs air-fuel ratio control of the engine by main air-fuel ratio feedback processing based on the output of the front air-fuel ratio sensor, and sub air-fuel ratio feedback processing for alternately switching the target air-fuel ratio between a lean-side target air-fuel ratio and a rich-side target air-fuel ratio based on the output of the rear air-fuel ratio sensor. Furthermore, the engine control device implements a limiting process for reducing the upper limit value of the control range of the opening degree of the wastegate valve when the combustion operation of the engine continues for a long period of time without being interrupted by the fuel cut compared to the case not such. 本发明涉及发动机控制装置，该发动机控制装置通过基于前空燃比传感器的输出的主空燃比反馈处理、和基于后空燃比传感器的输出将目标空燃比交替地切换为稀侧目标空燃比和浓侧目标空燃比的副空燃比反馈处理来进行发动机的空燃比控制。而且，发动机控制装置实施限制处理，该限制处理在没有通过燃料切断进行中断而发动机的燃烧运转持续长时间的情况下，与不是这样的情况相比，减小废气旁通阀的开度的控制范围的上限值。