Title:
【発明の名称】触媒劣化度検出装置
Document Type and Number:
Japanese Patent JP2812023
Kind Code:
B2
Abstract:
A catalyst deterioration detecting device comprising a first air-fuel ratio sensor and a second air-fuel ratio sensor which are arranged in the exhaust passage upstream and downstream of the catalyst, respectively. When the air-fuel ratio of the mixture fed into the engine is changed over from the lean air-fuel ratio (A/F)L to the rich air-fuel ratio (a/F)R, the air-fuel ratio detected by the second air-fuel ratio sensor is changed to the rich air-fuel ratio (A/F)R after it is maintained at the stoichiometric air-fuel ratio for a time ATR. The deterioration of the catalyst is detected based on the time TR, the amount of air and the difference between the rich air-fuel ratio (A/F)R and the stoichiometric air-fuel ratio.
Inventors:
Yu Sawada
Toshio Inoue
Toshio Inoue
Application Number:
JP29565191A
Publication Date:
October 15, 1998
Filing Date:
November 12, 1991
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
F02D41/14; F01N3/20; F01N11/00; F02D41/04; F02D41/22; (IPC1-7): F02D41/14; F01N3/20; F02D41/04
Domestic Patent References:
| JP2207159A | ||||
| JP230915A | ||||
| JP2136538A | ||||
| JP357862A | ||||
| JP3249357A | ||||
| JP291440A | ||||
| JP6397852A |
Attorney, Agent or Firm:
Aoki Akira (4 outside)