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Exhaust gas control device for internal combustion engine and control method thereof

a control device and internal combustion engine technology, applied in the direction of electrical control, machine/engine, exhaust treatment electric control, etc., can solve the problem of excessive catalyst temperature increase, and achieve the effect of suppressing an excessive catalyst temperature increas

Inactive Publication Date: 2017-10-05
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent is about a device and method for controlling the exhaust gas of an internal combustion engine. It prevents the temperature of the catalyst in the engine from rising too high during a regeneration control that involves setting one cylinder to a rich air-fuel ratio and the others to a lean air-fuel ratio. The technical effect is to maintain the temperature of the catalyst within an acceptable range to improve fuel efficiency and emission control.

Problems solved by technology

Accordingly, while the control of regenerating a catalyst is performed, there is a possibility that the temperature of the catalyst will excessively increase over the temperature range required for regenerating the catalyst depending on the operation state of the internal combustion engine or the set rich air-fuel ratio and lean air-fuel ratio.

Method used

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  • Exhaust gas control device for internal combustion engine and control method thereof
  • Exhaust gas control device for internal combustion engine and control method thereof
  • Exhaust gas control device for internal combustion engine and control method thereof

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Embodiment Construction

[0018]FIG. 1 is a diagram schematically illustrating a configuration of an exhaust gas control device 1 (an exhaust gas control device for an internal combustion engine). As illustrated in FIG. 1, the exhaust gas control device 1 includes a three-way catalyst 31 that purifies exhaust gas of an internal combustion engine 20. The internal combustion engine 20 combusts an air-fuel mixture in a combustion chamber 23 in a cylinder block 21 to cause a piston 24 to reciprocate. The internal combustion engine 20 is an in-line four cylinder gasoline engine, but is not limited thereto as long as it includes a plurality of cylinders and may be, for example, a diesel engine.

[0019]An intake valve Vi that opens and closes an intake port and an exhaust valve Ve that opens and closes an exhaust port are provided for each cylinder in a cylinder head of the internal combustion engine 20. An ignition plug 27 that ignites the air-fuel mixture in the combustion chamber 23 is attached to a top of the cyl...

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Abstract

An exhaust gas control device for an internal combustion engine includes an estimation unit configured to estimate a temperature of a catalyst on the basis of an acquired operation state of the internal combustion engine and a difference between a lean air-fuel ratio and a rich air-fuel ratio which are set as target air-fuel ratios during execution of catalyst regeneration control, a determination unit configured to determine whether the estimated temperature of the catalyst is higher than a threshold value during execution of the catalyst regeneration control, and a prohibition unit configured to prohibit the catalyst regeneration control when it is determined that the estimated temperature of the catalyst is higher than the threshold value during execution of the catalyst regeneration control.

Description

INCORPORATION BY REFERENCE[0001]The disclosure of Japanese Patent Application No. 2016-075168 filed on Apr. 4, 2016 including the specification, drawings and abstract is incorporated herein by reference in its entirety.BACKGROUND1. Technical Field[0002]The disclosure relates to an exhaust gas control device for an internal combustion engine and a control method thereof.2. Description of Related Art[0003]A technique of increasing a temperature of a catalyst by so-called dither control of setting a target air-fuel ratio of one cylinder among a plurality of cylinders of an internal combustion engine to a rich air-fuel ratio and setting target air-fuel ratios of the other cylinders to a lean air-fuel ratio is known (for example, see Japanese Patent Application Publication No. 9-088663 (JP 9-088663 A)).SUMMARY[0004]Regenerating a catalyst by increasing the temperature of the catalyst up to a temperature range higher than a temperature range in which the catalyst is activated by such a te...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01N9/00F01N3/08
CPCF01N9/005F01N2260/04F01N3/0885F02D41/027F02D2200/0804F02D2250/32F01N3/101F01N2900/0412F01N2900/08F01N2900/1402F01N2900/1404Y02T10/12
Inventor MYOJO, KEIICHISHOGENJI, YOSHIYUKINOSE, YUKIIKUTA, EIJI
Owner TOYOTA JIDOSHA KK
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