Title:
触媒の自己診断装置
Document Type and Number:
Japanese Patent JP3588662
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To diagnose the cold time HC adsorbing capacity of an HC adsorbing catalyst and a lean NOx catalyst and HC desorbing capacity from the cold time to warming up. SOLUTION: Signals from an O2 sensor A on the upper reaches and an O2 sensor B on the lower reaches are inputted to a signal comparing circuit D, and the output of a water temperature sensor C and the signal comparing circuit D is inputted to a catalyst degradation circuit E to judge degradation. An alarm circuit F lights a light emission diode at the time of judging catalyst degradation. Since a catalyst for adsorbing HC at the cold time and desorbing HC after warming up is diagnosed from the ratio of rich time of the O2 sensors A, B on the upper and lower reaches, the catalyst can be diagnosed respectively at the time of adsorption and desorption so as to improve the accuracy of diagnosis.
Inventors:
Sawamoto national emblem
Application Number:
JP23292795A
Publication Date:
November 17, 2004
Filing Date:
September 11, 1995
Export Citation:
Assignee:
Nissan Motor Co., Ltd
International Classes:
F01N3/08; F01N3/20; F01N3/24; F02D41/14; (IPC1-7): F01N3/20; F01N3/08; F01N3/24; F02D41/14
Domestic Patent References:
| JP6066131A | ||||
| JP7208149A | ||||
| JP6093843A |
Attorney, Agent or Firm:
Tomijio Sasashima