Title:
CATALYST DETERIORATION ANALYSIS DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/175654
Kind Code:
A1
Abstract:
Provided is a catalyst deterioration analysis device capable of detecting the degree of deterioration of a catalyst of a catalyst converter by a single oxygen concentration sensor without hindrance. The catalyst deterioration analysis device includes: a downstream air-fuel ratio level counting unit (35) that counts the number of times that an output signal of an oxygen concentration sensor (12) on a downstream side of a catalyst converter (11) exceeds a theoretical air-fuel ratio level; an upstream air-fuel ratio level counting unit (37) that counts the number of times that the air-fuel ratio level in an exhaust port of an internal combustion engine exceeds the theoretical air-fuel ratio level; a count storage unit (44) that stores these count values; and a catalyst deterioration analysis unit (38) that performs deterioration analysis of the catalyst on the basis of these count values. When starting the deterioration analysis of the catalyst, the catalyst deterioration analysis device uses the count value stored in the count storage unit (44) as an initial value to resume the counting.
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Inventors:
IKEDA YURIE (JP)
Application Number:
PCT/JP2022/011204
Publication Date:
September 21, 2023
Filing Date:
March 14, 2022
Export Citation:
Assignee:
HITACHI ASTEMO LTD (JP)
International Classes:
F01N3/00; F01N3/20; F01N3/24; F02D45/00
Foreign References:
| JP2012052461A | 2012-03-15 | |||
| JP2018040322A | 2018-03-15 | |||
| JP2006002579A | 2006-01-05 | |||
| US20210102507A1 | 2021-04-08 |
Attorney, Agent or Firm:
DELOITTE TOHMATSU IP FIRM (JP)
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