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Abnormality Diagnosis System of Exhaust Purification Device

An exhaust gas purification device and abnormal diagnosis technology, which can be applied to the diagnosis device of exhaust gas treatment device, exhaust device, electronic control of exhaust gas treatment device, etc., can solve the problems of reduced NOx storage capacity, SOx poisoning, etc.

Active Publication Date: 2020-07-24
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the NSR catalyst, the so-called SOx poisoning may occur in which the NOx storage capacity is reduced due to the storage of SOx in the exhaust gas.

Method used

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  • Abnormality Diagnosis System of Exhaust Purification Device
  • Abnormality Diagnosis System of Exhaust Purification Device
  • Abnormality Diagnosis System of Exhaust Purification Device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] (approximate composition)

[0062] Here, a case where the present invention is applied to an exhaust gas purification device of a diesel engine for driving a vehicle will be described as an example. figure 1 It is a diagram showing a schematic configuration of the intake and exhaust system of the internal combustion engine according to the present embodiment. The internal combustion engine 1 is a diesel engine for driving a vehicle. However, the present invention can also be applied to an exhaust purification device of a gasoline engine that performs a lean-burn operation.

[0063] An intake passage 2 and an exhaust passage 3 are connected to the internal combustion engine 1 . An air flow meter 4 is provided in the intake passage 2 . The air flow meter 4 detects the intake air amount of the internal combustion engine 1 . In addition, a throttle valve 5 is provided in the intake passage 2 on the downstream side of the air flow meter 4 . The throttle valve 5 controls...

Deformed example 1

[0100] Next, a first modification example of abnormality diagnosis of the NSR catalyst according to the present embodiment will be described. Such as image 3 As shown, there is a difference in transition of the NOx storage efficiency of the NSR catalyst 6 after the execution of the NOx reduction process is completed and after the execution of the lean temperature increase process is completed. However, the parameter for abnormality diagnosis of the NSR catalyst 6 is not limited to the NOx storage efficiency itself of the NSR catalyst 6 . That is, a predetermined parameter correlated with the NOx storage efficiency of the NSR catalyst 6 after execution of the lean temperature raising process may be used as a parameter for abnormality diagnosis of the NSR catalyst 6 .

[0101] For example, the NOx storage amount in the NSR catalyst 6 after the execution of the NOx reduction treatment and after the execution of the lean temperature increase treatment is of course correlated wit...

Deformed example 2

[0111] Next, a second modified example of the abnormality diagnosis of the NSR catalyst according to the present embodiment will be described. As in the above based on image 3 As explained, after the execution of the NOx reduction treatment or the execution of the lean temperature raising treatment is completed: when the NOx storage amount in the NSR catalyst 6 reaches a certain amount, the NOx storage efficiency of the NSR catalyst 6 starts reduce. In addition, both after the execution of the NOx reduction process and after the execution of the lean temperature raising process is completed: the rate of decrease in the NOx storage efficiency after the NOx storage efficiency starts to decrease is the same as when the NSR catalyst 6 is normal (L1, L3 ) when the NSR catalyst 6 is degraded (L2, L4), the decrease rate becomes larger. Furthermore, at this time, regarding the difference in the rate of decrease in NOx storage efficiency between when the NSR catalyst 6 is normal and...

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PUM

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Abstract

An object of the present invention is to provide an abnormality diagnosis system of an exhaust gas purification system capable of diagnosing abnormality of a NOx trap catalyst even when the degree of deterioration thereof is relatively small. In the present invention, when abnormality diagnosis of the NOx trap catalyst is performed, lean temperature rise processing for maintaining the air-fuel ratio of the exhaust gas flowing into the NOx trap catalyst at a lean air-fuel ratio higher than the stoichiometric air-fuel ratio , and a process of raising the temperature of the NOx trap catalyst to a predetermined temperature or higher. Then, an abnormality of the NOx trap catalyst is diagnosed based on the NOx storage efficiency of the NOx trap catalyst after execution of the lean temperature increase process or a predetermined parameter correlated with the NOx storage efficiency.

Description

technical field [0001] The present invention relates to an abnormality diagnosis system of an exhaust purification device of an internal combustion engine performing a lean burn operation. Background technique [0002] It is known that a NOx trap catalyst is provided as an exhaust purification catalyst in an exhaust passage of an internal combustion engine that operates at a lean air-fuel ratio higher than the stoichiometric air-fuel ratio, that is, lean burn operation. The NOx trap catalyst has a function of storing NOx in the exhaust gas when the air-fuel ratio of the exhaust gas is lean. In addition, the term "occlusion" of NOx here also includes the meaning of "occlusion" of NOx. As such a NOx trap catalyst, for example, a storage-reduction NOx catalyst (hereinafter also sometimes referred to as "NSR catalyst") may be used. The NSR catalyst has the following functions: when the air-fuel ratio of the exhaust gas is lean, it absorbs NOx in the exhaust gas, and when the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N11/00F01N3/08
CPCF01N3/0814F01N3/0842F01N11/00F01N2430/06F01N2550/03F01N2570/14F01N3/2033F01N3/2066F01N3/36F01N11/007F01N2900/1614Y02T10/12Y02T10/40F01N3/2006F01N9/00F01N2550/02
Inventor 高冈一哉木所彻
Owner TOYOTA JIDOSHA KK