Control apparatus of internal combustion engine

Patent metadata

Field	Value
Publication number	US-9541012-B2
Application number	US-201313908502-A
Country	US
Kind code	B2
Filing date	Jun 3, 2013
Priority date	Jan 11, 2013
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

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.

First claim

What is claimed is:

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 detector configured to detect 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 detector configured to detect an internal intake temperature of the intake manifold as an intake manifold temperature;
a waste gate valve configured to provide 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 detector configured to detect a rotation speed of the internal combustion engine;
an exhaust pressure calculator configured to calculate a pressure in the exhaust path provided upstream of the turbine as an exhaust pressure;
a pre-correction volumetric efficiency equivalent value calculator configured to calculate 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 calculator for pre-correction volumetric efficiency equivalent value configured to calculate 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;
a cylinder suction air amount calculator configured to calculate a correction calculation parameter 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,
wherein:
the amount of air entering the cylinder from the intake manifold is calculated on the basis of the post-correction volumetric efficiency equivalent value; and
fuel input into the internal combustion engine is controlled by the control apparatus at least in part based on the calculated amount of air.

2. The control apparatus of an internal combustion engine according to claim 1 , wherein:
the correction calculation parameter is calculated in accordance with an equation as follows:

η
=

{

[

(

P
b

P
3

)

1
-
κ

κ

-
1

]

}

{

[

(

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b

P
30

)

1
-
κ

κ

-
1

]

}

where
⁢

⁢

{

P
b

P
X

=

P
b

P
X

when
⁢

⁢

(

2

κ
+
1

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κ

κ
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1

<

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=

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1

Assignees

• Mitsubishi Electric Corp

Inventors

• Saito Toshikatsu
• Yokono Michihisa
• Makino Tomokazu

Classifications

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F02D2200/0411

  Volumetric efficiency · CPC title

• F02D2200/0406

  Intake manifold pressure · CPC title

• F02D13/0269

  Controlling the valves to perform a Miller-Atkinson cycle · CPC title

• F02D23/00 Primary

  Controlling engines characterised by their being supercharged · CPC title