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Exhaust purification device for internal combustion engines

A technology of exhaust purification device and internal combustion engine, which is applied in the direction of exhaust device, electric control of exhaust treatment device, diagnostic device of exhaust treatment device, etc., which can solve the problems of deterioration of exhaust emission and achieve the purpose of suppressing the deterioration of exhaust emission Effect

Inactive Publication Date: 2021-08-17
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, after the oxygen storage amount of the upstream side catalyst reaches the maximum oxygen storage amount, a large amount of NOx flows out from the upstream side catalyst, and the exhaust emission deteriorates.

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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Experimental program
Comparison scheme
Effect test

no. 1 approach ＞

[0051] First, refer to Figure 1 to Figure 11 , the first embodiment of the present invention will be described.

[0052]

[0053] figure 1 It is a diagram schematically showing an internal combustion engine provided with an exhaust purification device for an internal combustion engine according to a first embodiment of the present invention. figure 1 The internal combustion engine shown is a spark ignition internal combustion engine. The internal combustion engine is mounted on the vehicle.

[0054] refer to figure 1 , 1 represents the body of the internal combustion engine, 2 represents the cylinder block, 3 represents the piston reciprocating in the cylinder block 2, 4 represents the cylinder head fixed on the cylinder block 2, and 5 represents the combustion chamber formed between the piston 3 and the cylinder head 4 6 represents the intake valve, 7 represents the intake port, 8 represents the exhaust valve, and 9 represents the exhaust port. The intake valve 6 open...

no. 2 approach ＞

[0171] The configuration and control of the exhaust purification device for an internal combustion engine in the second embodiment are basically the same as those of the exhaust purification device for an internal combustion engine in the first embodiment, except for the points described below. Therefore, the second embodiment of the present invention will be described below focusing on the differences from the first embodiment.

[0172] In the second embodiment, in the first control, the first side is the lean side, and the second side is the rich side. In this case, the first control is also referred to as lean collapse control, and is executed as follows. The air-fuel ratio control unit 31 sets the target air-fuel ratio to a second rich setting that is richer than the theoretical air-fuel ratio when the output air-fuel ratio of the downstream side air-fuel ratio sensor 41 reaches the second lean determination air-fuel ratio that is leaner than the theoretical air-fuel ratio...

no. 3 approach ＞

[0201] The configuration and control of the exhaust purification device for an internal combustion engine in the third embodiment are basically the same as those of the exhaust purification device for an internal combustion engine in the first embodiment, except for the points described below. Therefore, the third embodiment of the present invention will be described below focusing on the parts different from the first embodiment.

[0202] Figure 14 It is a diagram schematically showing an internal combustion engine provided with an exhaust purification device for an internal combustion engine according to a second embodiment of the present invention. The exhaust purification device includes an upstream catalyst 20 , a downstream catalyst 24 , an upstream air-fuel ratio sensor 40 , a downstream air-fuel ratio sensor 41 , an air-fuel ratio control unit 31 , a temperature calculation unit 32 , and a catalyst degradation calculation unit 33 . In the second embodiment, the ECU 3...

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Abstract

An exhaust gas purification device for an internal combustion engine suppresses deterioration of exhaust emissions when the oxygen storage amount of the catalyst is changed. It includes: an upstream side catalyst which is arranged in the exhaust passage and can store oxygen; a downstream side catalyst which is arranged on the downstream side of the upstream side catalyst in the exhaust gas flow direction and which can store oxygen; and an air-fuel ratio sensor which is arranged in between the upstream side catalyst and the downstream side catalyst, and detecting the air-fuel ratio of the outgoing exhaust gas flowing out from the upstream side catalyst; an air-fuel ratio control unit that controls the air-fuel ratio of the inflow exhaust gas flowing into the upstream side catalyst to a target air-fuel ratio; and a temperature calculation unit which calculates the temperature of the downstream side catalyst. The air-fuel ratio control unit executes one-side collapse control and double-side collapse control. The air-fuel ratio control unit switches from the one-side collapse control to the two-side collapse control when the temperature of the downstream side catalyst calculated by the temperature calculating unit rises to a reference temperature equal to or higher than the activation temperature of the downstream side catalyst.

Description

technical field [0001] The present invention relates to an exhaust purification device for an internal combustion engine. Background technique [0002] Conventionally, it is known to dispose a catalyst capable of storing oxygen in an exhaust passage of an internal combustion engine, and to purify unburned gases (HC, CO, etc.) and NOx in the exhaust gas in the catalyst. The higher the oxygen storage capacity of the catalyst, the larger the amount of oxygen that the catalyst can store, and the higher the exhaust purification performance of the catalyst. [0003] In order to maintain the oxygen storage capacity of the catalyst, it is preferable to vary the oxygen storage amount of the catalyst so that the oxygen storage amount of the catalyst is not kept constant. In the internal combustion engine described in Patent Document 1, the upstream side catalyst and the downstream side catalyst are arranged in the exhaust passage, and in order to vary the oxygen storage amount of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/14
CPCF01N3/101F02D41/0295F01N11/007F01N13/008F02D41/1439F02D41/1456F02D41/1458F02D41/1475F01N2430/06F01N2550/02F01N2560/025F01N2560/14F01N2900/0408F01N2900/0422F01N2900/0601F01N2900/1624F02D2200/0802F02D2200/0804F02D2200/0814F02D2200/0816F02D2250/36F01N13/0093F01N13/009F01N9/00F01N2900/1602F01N2900/102F01N2900/1402F01N11/002Y02A50/20Y02T10/12Y02T10/40F01N3/20F01N3/2882
Inventor 梅泽幸司森广锦司
Owner TOYOTA JIDOSHA KK