Control device for internal combustion engine

Patent metadata

Field	Value
Publication number	US-10550778-B2
Application number	US-201815976876-A
Country	US
Kind code	B2
Filing date	May 11, 2018
Priority date	May 12, 2017
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

Provided is a control device for an internal combustion engine, which can ensure a stable combustion state of the internal combustion engine even under a high-humidity environment condition, thereby improving the merchantability. The control device for the internal combustion engine includes an ECU (electronic control unit). The ECU calculates a basic target EGR amount according to an operating state of the internal combustion engine, calculates a water vapor amount in air drawn into an intake passage of the internal combustion engine, calculates an EGR conversion amount by using the water vapor amount, calculates a target EGR amount by subtracting the EGR conversion amount from the basic target EGR amount, and controls internal EGR and external EGR of the internal combustion engine by using the target EGR amount.

First claim

What is claimed is:

1. A control device for an internal combustion engine, comprising:
an intake air amount parameter acquiring part acquiring an intake air amount parameter representing an amount of intake air, the intake air being air drawn into an intake passage of the internal combustion engine;
a water vapor parameter acquiring part acquiring a water vapor parameter representing a ratio or an amount of water vapor in the intake air;
a dry intake air parameter calculation part calculating a dry intake air parameter by using the intake air amount parameter and the water vapor parameter, the dry intake air parameter representing a ratio or an amount of dry intake air obtained by excluding the water vapor from the intake air; and
a combustion timing control part controlling a combustion timing of a gas mixture of the internal combustion engine by using the dry intake air parameter,
wherein the combustion timing control part calculates a dry intake air amount, which is the amount of the dry intake air, as the dry intake air parameter, calculates a water vapor amount, which is the amount of the water vapor, as the water vapor parameter, calculates an in-cylinder gas temperature, which is a gas temperature inside a cylinder, by using the dry intake air amount and the water vapor amount, and controls the combustion timing by using the in-cylinder gas temperature.

2. The control device for the internal combustion engine according to claim 1 , wherein:
the combustion timing control part calculates a total EGR (exhaust gas recirculation) ratio representing a ratio of EGR in a total in-cylinder gas by using the dry intake air parameter and the water vapor parameter, and controls the combustion timing by using the total EGR ratio.

3. The control device for the internal combustion engine according to claim 2 , wherein:
the combustion timing control part calculates the dry intake air amount, which is the amount of the dry intake air, as the dry intake air parameter, calculates the water vapor amount, which is the amount of the water vapor, as the water vapor parameter, calculates, by multiplying the water vapor amount by a conversion factor greater than 1, an EGR conversion amount obtained by converting the water vapor amount into an EGR amount, and calculates the total EGR ratio by using the dry intake air amount and the EGR conversion amount.

4. A control device for an internal combustion engine, comprising:
a basic target EGR amount calculation part calculating, according to an operating state of the internal combustion engine, a basic target EGR amount that is a basis of a target value of an EGR amount, the EGR amount being an amount that causes an exhaust gas inside an exhaust passage of the internal combustion engine to recirculate to an intake side of the internal combustion engine;
a water vapor parameter acquiring part acquiring a water vapor parameter representing a ratio or an amount of water vapor in intake air, the intake air being air drawn into an intake passage of the internal combustion engine;
a water vapor amount calculation part calculating a water vapor amount, which is the amount of the water vapor, by using the water vapor parameter;
an EGR conversion amount calculation part calculating, by multiplying the water vapor amount by a conversion factor greater than 1, an EGR conversion amount obtained by converting the water vapor amount into an EGR amount;
a target EGR amount calculation part calculating a target EGR amount by correcting the basic target EGR amount by the EGR conversion amount; and
a control part controlling operation of the internal combustion engine by using the target EGR amount.

5. The control device for the internal combustion engine according to claim 3 , wherein the conversion factor is set to a value from 1.2 to 1.4.

6. The control device for the internal combustion engine according to claim 4 , wherein the conversion factor is set to a value from 1.2 to 1.4.

Assignees

• Honda Motor Co Ltd

Inventors

• Ueno Masaki
• Kimura Noritaka
• Ihara Kosuke
• Katori Yuto
• Yamada Yosuke
• Uto Hajime

Classifications

• F02M26/01

  Internal exhaust gas recirculation, i.e. wherein the residual exhaust gases are trapped in the cylinder or pushed back from the intake or the exhaust manifold into the combustion chamber without the use of additional passages · CPC title

• F02D35/026

  using an estimation · CPC title

• F02P5/152

  dependent on pinking (detecting or indicating knocks in internal-combustion engines G01L23/22) · CPC title

• F02D41/0062 Primary

  Estimating, calculating or determining the internal EGR rate, amount or flow · CPC title

• F02D2200/0418

  Air humidity · CPC title