Title:
CATALYST DETERIORATION DETECTING DEVICE FOR CATALYTIC CONVERTER
Document Type and Number:
Japanese Patent JP3147632
Kind Code:
B2
Abstract:
PURPOSE: To accurately judge deterioration of a catalyst by a method wherein the detecting values of first and second temperature sensors are compared with each other and when a temperature difference at some point of time exceeds a given value, it is decided that deterioration occurs.
CONSTITUTION: The heat sensing part 15 of a first temperature sensor 13 is incorporated in the tip part of a sensor support body 17 so that the temperature of the central part of a catalyst 11 is detected. The heat sensing part 16 of a second temperature sensor 14 is incorporated in the middle of a sensor support body 17 so that the temperature of the peripheral part of the catalyst 11 is detected. Detecting signals from the first and second sensors 13 and 14 are inputted to a decision circuit 25 through amplifiers 23 and 24. Based on a signal outputted to the deciding circuit 25, the first and second temperature sensors 13 and 14 are compared with each other. When a temperature difference at some point of time exceeds a given value, it is decided that deterioration occurs and a warming lamp 27 is lighted ON. This constitution performs proper decision of deterioration of the catalyst 11, suppresses the occurrence of unevenness in deterioration of the two temperature sensors, and improves reliability.
Inventors:
Tsutomu Kikuchi
Application Number:
JP32480393A
Publication Date:
March 19, 2001
Filing Date:
December 22, 1993
Export Citation:
Assignee:
Nissan Motor Co., Ltd
International Classes:
G01M15/04; F01N3/00; F01N3/20; F02B77/08; F02D35/00; F02D45/00; G01M15/00; (IPC1-7): F01N3/20; F02B77/08; F02D35/00
Domestic Patent References:
| JP7166844A | ||||
| JP226717U | ||||
| JP5508900A | ||||
| JP6501532A | ||||
| JP5505660A |
Attorney, Agent or Firm:
Masaki Goto (1 person outside)