Control device for internal combustion engine

A control device for an internal combustion engine, comprising:

• a throttle valve provided in an intake pipe of the internal combustion engine;
• intake air flow quantity controlling means for controlling a throttle opening degree of the throttle valve to change an opening area of the intake pipe and hence variably controlling an actual engine intake air flow quantity, namely, a flow quantity of air actually sucked by the internal combustion engine;
• operation state detecting means for detecting operation states including at least a rotational speed of the internal combustion engine;
• intake air flow quantity detecting means provided upstream of the throttle valve in the intake pipe, for detecting the actual engine intake air flow quantity, namely, the flow quantity of air actually sucked by the internal combustion engine;
• intake pipe internal pressure detecting means for detecting a pressure downstream of the throttle valve in the intake pipe as an intake pipe internal pressure;
• actual cylinder intake air flow quantity calculating means for calculating an actual cylinder intake air flow quantity, namely, a flow quantity of air actually sucked into cylinders of the internal combustion engine;
• target cylinder intake air flow quantity calculating means for calculating a target cylinder intake air flow quantity based on the operation states;
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• target engine intake air flow quantity calculating means for making a correction equivalent to phase lead compensation for the target cylinder intake air flow quantity to calculate a target engine intake air flow quantity, wherein:
• the actual cylinder intake air flow quantity calculating means calculates:
• a volumetric efficiency equivalent value of air sucked into the cylinders from the intake pipe based on the rotational speed and the intake pipe internal pressure;
• a response delay model for an intake system based on the volumetric efficiency equivalent value, an intake pipe volume from a downstream side of the throttle valve to inlets of the cylinders, and a displacement of each of the cylinders;
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• the actual cylinder intake air flow quantity based on the actual engine intake air flow quantity and the response delay model;
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• the intake air flow quantity controlling means controls the throttle opening degree based on the target engine intake air flow quantity such that the actual cylinder intake air flow quantity converges at the target cylinder intake air flow quantity.