Exhaust purifying apparatus for internal combustion engine and exhaust purifying method for internal combustion engine

一种排气净化装置、内燃机的技术，应用在排气处理装置的电控、排气装置、排气处理装置的诊断装置等方向，能够解决氧浓度低等问题

Inactive Publication Date: 2018-07-20
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, gasoline engines usually operate at the stoichiometric air-fuel ratio, so the oxygen concentration of the exhaust gas flowing through the filter is low

Method used

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  • Exhaust purifying apparatus for internal combustion engine and exhaust purifying method for internal combustion engine
  • Exhaust purifying apparatus for internal combustion engine and exhaust purifying method for internal combustion engine
  • Exhaust purifying apparatus for internal combustion engine and exhaust purifying method for internal combustion engine

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Embodiment Construction

[0024] Hereinafter, embodiments of the present invention will be described in detail based on examples with reference to the drawings. However, unless otherwise specified, dimensions, materials, shapes, and relative arrangements of components described in this embodiment do not limit the scope of the present invention thereto.

[0025]

[0026] figure 1 It is a diagram showing the schematic configuration of the internal combustion engine 1 and the intake system and exhaust system of the internal combustion engine according to the present embodiment. figure 1 The internal combustion engine 1 shown is a gasoline engine. The internal combustion engine 1 is mounted on, for example, a vehicle. The exhaust passage 2 is connected to the internal combustion engine 1 . In the middle of the exhaust passage 2, a first catalyst 3 serving as a three-way catalyst and a filter 41 carrying a second catalyst 4 serving as a three-way catalyst are provided in this order from the upstream side...

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PUM

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Abstract

An exhaust gas control apparatus includes a first catalyst, a filter, and an electronic control unit. The electronic control unit is configured to alternately execute lean control and rich control multiple times. The lean control is control for, over a period longer than a period from when a target air-fuel ratio is set to a predetermined lean air-fuel ratio until an air-fuel ratio of exhaust gasflowing out from the first catalyst becomes greater than the stoichiometric air-fuel ratio, setting the target air-fuel ratio to the predetermined lean air-fuel ratio. The rich control is control for,over a period longer than a period from when the target air-fuel ratio is set to a predetermined rich air-fuel ratio until the air-fuel ratio of exhaust gas flowing out from the first catalyst becomes smaller than the stoichiometric air-fuel ratio, setting the target air-fuel ratio to the predetermined rich air-fuel ratio.

Description

technical field [0001] The present invention relates to an exhaust purification device of an internal combustion engine and an exhaust purification method of the internal combustion engine. Background technique [0002] An exhaust passage of an internal combustion engine may be provided with a filter for trapping particulate matter (hereinafter also referred to as PM) in exhaust gas. When the amount of PM captured by the filter (hereinafter also referred to as PM accumulation amount) reaches a certain amount, a process of oxidizing PM to remove it is performed. This process is called regeneration of the filter. In order to oxidize PM captured by the filter, the temperature of the filter must be equal to or higher than a predetermined temperature, and the oxygen concentration of the exhaust gas flowing into the filter must be equal to or greater than a predetermined concentration. [0003] Here, for a diesel engine, a technique for regenerating a filter is known (for exampl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/023F01N3/20F01N9/00
CPCF01N3/023F01N3/20F01N9/002F01N2250/02F01N3/0864F01N3/103F01N3/2033F01N3/0253F01N3/035F01N2430/06F01N2550/04F01N2560/025F01N2560/06F01N2610/03F01N2610/146F01N2900/0411F01N2900/0422F01N2900/08F01N2900/1402F01N2900/1404F01N2900/1602F01N2900/1606F01N2900/1812F01N2900/1821F01N13/009F02D41/0255F02D41/0245F02D41/025F02D41/029F02D41/064F02D41/1454F02D2200/0802F02D41/1475F01N3/0814F02D41/3023Y02T10/12Y02T10/40F01N3/0238F02D41/222F02D41/0235F02D2041/0265F02D13/0211F02D41/402F02D45/00
Inventor 金子真也大冢孝之
Owner TOYOTA JIDOSHA KK
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