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Exhaust purification device for internal combustion engines

An exhaust purification device and technology for exhaust purification, which are applied in the direction of exhaust device, electronic control of exhaust gas treatment device, internal combustion piston engine, etc., can solve problems such as the deterioration of precious metals, and achieve the effect of inhibiting deterioration

Active Publication Date: 2022-06-24
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such an exhaust purification catalyst, it is known that if the fuel cut control is executed in a state where the temperature of the exhaust purification catalyst is high, the noble metal carried on the exhaust purification catalyst may deteriorate (for example, Patent Document 1).

Method used

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  • Exhaust purification device for internal combustion engines
  • Exhaust purification device for internal combustion engines
  • Exhaust purification device for internal combustion engines

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Embodiment Construction

[0035] Hereinafter, embodiments will be described in detail with reference to the drawings. In addition, in the following description, the same code|symbol is attached|subjected to the same component.

[0036]

[0037] "General Description of Internal Combustion Engines"

[0038] figure 1 This is a diagram schematically showing an internal combustion engine using the exhaust purification system of the first embodiment. like figure 1 As shown, the internal combustion engine 1 includes an internal combustion engine body 2, a cylinder block 3, a piston 4 reciprocating in the cylinder block 3, a cylinder head 5 fixed to the cylinder block 3, an intake valve 6, an intake port 7, and an exhaust valve 8 , Exhaust port 9. A combustion chamber 10 is formed between the piston 4 and the cylinder head 5 . The intake valve 6 opens and closes the intake port 7 , and the exhaust valve 8 opens and closes the exhaust port 9 . In addition, the internal combustion engine body 2 is provid...

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PUM

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Abstract

Exhaust gas purifiers for internal combustion engines suppress local heating of precious metals and suppress deterioration of precious metals. An exhaust purification device for an internal combustion engine (1) includes an exhaust purification catalyst (20) carrying a noble metal and capable of storing oxygen, and a control device (31) for controlling the amount of fuel supplied to a combustion chamber (10). When a predetermined fuel cut execution condition is established, the control device executes fuel supply control for temporarily supplying fuel to the combustion chamber so that the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst becomes richer than the theoretical air-fuel ratio. Thereafter, the fuel cut control for stopping the supply of fuel to the combustion chamber while the internal combustion engine is operating is started.

Description

technical field [0001] The present invention relates to an exhaust gas purification device of an internal combustion engine. Background technique [0002] Conventionally, there has been known an internal combustion engine capable of executing fuel cut control for stopping the supply of fuel to the combustion chamber while the internal combustion engine is in operation, such as during deceleration of a vehicle equipped with the internal combustion engine. In addition to this, an exhaust purification catalyst for an internal combustion engine in which an exhaust purification catalyst supporting a noble metal such as palladium is provided in an exhaust passage of the internal combustion engine is also known. Among such exhaust purification catalysts, it is known that if the fuel cut control is executed in a state where the temperature of the exhaust purification catalyst is high, the noble metal carried on the exhaust purification catalyst may deteriorate (for example, Patent D...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/00F02D41/02F02D41/14
CPCF02D41/009F02D41/0077F02D41/0295F02D41/1454F02D41/123F02D41/025F02D41/1475F02D2200/0814F01N9/00F01N3/0814F01N2430/06F01N2430/04F01N3/0864
Inventor 梅本寿丈
Owner TOYOTA JIDOSHA KK