Apparatus for controlling internal combustion engine with supercharging device

Abstract

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.