Patent EP0756072A2 successfully refreshed from Google Patents.
EP0756072A2
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EP
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A device for determining an abnormal degree of deterioration of a catalyst
Assignee: Toyota Motor Corp
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Filing: 1996-07-25
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Granted: —
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Expires: 2016-07-25
Abstract
Abstract A device for determining the abnormal degree of deterioration of catalyst of a catalytic converter arranged in an internal combustion engine exhaust system is disclosed. The device comprises ability value grasping means for grasping an ability value in relation with a current purification ability of the catalyst and varying amount grasping means for grasping a varying amount of the ability value grasped by the ability value grasping means. It is determined that the degree of deterioration of the catalyst is abnormal when the varying amount grasped by the varying amount grasping means is smaller than a predetermined value.
Inventors
- 👤 Toru Hanafusa
- 👤 Michihiro Ohashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 22:43
CPC Classifications
F; F01; F01N; F01N9/00; F01N9/005; F01N11/00; F01N11/002; F01N11/005; F01N11/007; F01N2550/00; F01N2550/02; F01N2560/00; F01N2560/02; F01N2560/023; F01N2570/00; F01N2570/16; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
A device for determining an abnormal degree of deterioration of catalyst of a catalytic converter arranged in an internal combustion engine exhaust system, comprising: ability value grasping means for grasping an ability value in relation with a current purification ability of said catalyst; varying amount grasping means for grasping a varying amount of said ability value grasped by said ability value grasping means; and abnormal determining means for determining that the degree of deterioration of said catalyst is abnormal when said varying amount grasped by said varying amount grasping means is smaller than a predetermined value.
Claim 2
Dependent Claim
35 words
A device according to claim 1, wherein said varying amount grasping means grasps a ratio of a varying of said ability value to a varying of time, as said varying amount of said ability value.
Claim 3
Dependent Claim
39 words
A device according to claim 1, wherein said varying amount grasping means grasps a ratio of a varying of said ability value to a varying of the temperature of said catalyst, as said varying amount of said ability value.
Claim 4
Dependent Claim
29 words
A device according to claim 1, wherein said ability value grasping means grasp said ability value on the basis of a current O 2 storage ability of said catalyst.
Claim 5
Dependent Claim
28 words
A device according to claim 1, wherein said ability value grasping means grasp said ability value on the basis of a current HC purification ability of said catalyst.
Claim 6
Dependent Claim
24 words
A device according to claim 1, wherein said abnormal determining means determines only when the temperature of said catalyst is within a predetermined range.
Claim 7
Dependent Claim
20 words
A device according to claim 2, wherein said abnormal determining means determines only when the engine operating condition is steady.
Claim 8
Dependent Claim
24 words
A device according to claim 2, wherein said abnormal determining means determines only when an amount of intake air is within a predetermined range.
Claim 9
Dependent Claim
30 words
A device according to claim 6, wherein said predetermined range is a temperature range of said catalyst when said catalyst is warmed up but before said catalyst is activated completely.
References Cited (Backward Citations)
No citation records indexed.
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