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An electronic engine control system of an internal combustion engine with a supercharging device operable to produce a desired boost pressure, includes an electronically-controlled throttle valve and a pressure sensor located in an induction system to detect an actual boost pressure. The system comp

An electronic engine control system of an internal combustion engine with a supercharging device operable to produce a desired boost pressure, includes an electronically-controlled throttle valve and a pressure sensor located in an induction system to detect an actual boost pressure. The system computes a target air quantity used in a stratified combustion mode or in a homogeneous lean combustion mode, based on at least an operated amount of an accelerator, and computes the desired boost pressure based on engine speed and engine load, and computes a boost-pressure correction factor as the ratio of the desired boost pressure to the actual boost pressure, during the stratified combustion mode or during the homogeneous lean combustion mode. An arithmetic-calculation section is also provided to compensate for the target air quantity by the boost-pressure correction factor during the stratified combustion mode or during the homogeneous lean combustion mode. The compensated target air quantity is determined as a virtual target air quantity. A throttle actuator device drives the electronically-controlled throttle, so that the virtual target air quantity is drawn into the engine, thus compensating for the response delay in boost-pressure change during acceleration/deceleration in the lean or ultra-lean combustion mode.

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[ What is claimed is:] [1.]1. An apparatus for controlling an internal combustion engine with a supercharging device operable to produce a desired boost pressure, comprising:a throttle control device which controls a throttle valve;a pressure sensor located in an induction system to detect an actual

[ What is claimed is:] [1.]1. An apparatus for controlling an internal combustion engine with a supercharging device operable to produce a desired boost pressure, comprising:a throttle control device which controls a throttle valve;a pressure sensor located in an induction system to detect an actual boost pressure;a control unit being configured to be connected to the throttle control device for arbitrarily controlling a throttle opening of the throttle valve depending on an operated amount of an accelerator; said control unit comprising(a) an arithmetic-calculation section which calculates a target air quantity used in an engine operating region of a lean air/fuel ratio, based on at least the operated amount of the accelerator,(b) an arithmetic-calculation section which calculates the desired boost pressure based on engine speed and engine load,(c) an arithmetic-calculation section which calculates a boost-pressure correction factor responsively to a difference between the desired boost pressure and the actual boost pressure, in the engine operating region of the lean air/fuel ratio, and(d) an arithmetic-calculation section which compensates for the target air quantity used in the engine operating region of the lean air/fuel ratio by the boost-pressure correction factor to generate a compensated target air quantity, and determines the compensated target air quantity as a virtual target air quantity; anda throttle actuator device which drives the electronically-controlled throttle, so that the virtual target air quantity is drawn into the engine.