CONTROL APPARATUS OF INTERNAL COMBUSTION ENGINE

摘要

In a turbocharged internal combustion engine, an amount of cylinder suction air is calculated with sufficiently high accuracy to suitably control the internal combustion engine in consideration of influences of an exhaust pressure on a volumetric efficiency equivalent value without requiring a huge memory capacity, in fewer adaptive man hours, and under a low operation load. A correction calculation parameter is calculated using an exhaust pressure, an exhaust pressure for pre-correction volumetric efficiency equivalent value, and an intake manifold pressure, and a post-corrected volumetric efficiency equivalent value is calculated by correcting a pre-correction volumetric efficiency equivalent value using the correction calculation parameter. An amount of air entering a cylinder from an intake manifold is calculated on the basis of the post-correction volumetric efficiency equivalent value.

主权项

1. A control apparatus of an internal combustion engine controlling an internal combustion engine equipped with a supercharger having a turbine provided to an exhaust path of the internal combustion engine and a compressor provided upstream of a throttle valve provided to an intake path of the internal combustion engine and rotating integrally with the turbine, comprising:
an intake manifold pressure detection portion that detects an internal pressure of an intake manifold formed of a portion including a surge tank and an intake manifold provided downstream of the throttle valve as an intake manifold pressure; an intake manifold temperature detection portion that detects an internal intake temperature of the intake manifold as an intake manifold temperature; a waste gate valve that is provided to a bypass passage bypassing the turbine and changes a passage sectional area of the bypass passage by changing an opening degree; a rotation speed detection portion that detects a rotation speed of the internal combustion engine; an exhaust pressure calculation portion that calculates a pressure in the exhaust path provided upstream of the turbine as an exhaust pressure; a pre-correction volumetric efficiency equivalent value calculation portion that calculates a pre-correction volumetric efficiency equivalent value, which is an index indicating an amount of air entering a cylinder of the internal combustion engine from the intake manifold at one of a predetermined opening degree and a predetermined opening degree indicated value of the waste gate valve, on the basis of the intake manifold pressure and the rotation speed of the internal combustion engine; and an exhaust pressure calculation portion for pre-correction volumetric efficiency equivalent value that calculates an exhaust pressure for pre-correction volumetric efficiency equivalent value, which is an exhaust pressure corresponding to the pre-correction volumetric efficiency equivalent value, on the basis of the intake manifold pressure and the rotation speed of the internal combustion engine, wherein: a correction calculation parameter is calculated using the exhaust pressure, the exhaust pressure for pre-correction volumetric efficiency equivalent value, and the intake manifold pressure, and a post-correction volumetric efficiency equivalent value is calculated by correcting the pre-correction volumetric efficiency equivalent value using the correction calculation parameter; and the amount of air entering the cylinder from the intake manifold is calculated on the basis of the post-correction volumetric efficiency equivalent value.