Title:
AIR-FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JPH08144746
Kind Code:
A
Abstract:
PURPOSE: To detect deterioration caused by sulfur poisoning of a catalyst which is arranged in the exhaust system of an internal combustion engine independently of deterioration caused by secular change.
CONSTITUTION: Output PVO2 and SVO2 of O2 sensors 15, 16 which are arranged upstream and downstream of a catalytic converter rhodium 14 are read in (Step S81, S82), and it is judged on the basis of those sensor outputs whether sulfur poisoning of the three way catalyst 14 is generated or not (Step S83). To say concretely, for example, when the maximum value SVO2MAX of downstream side O2 sensor output SVO2 is in a prescribed value SVO2 REF1 and less, sulfur poisoning is judged.
Inventors:
ITO HIROSHI
HACHINAGA MORIJI
KANEKO TETSUYA
IWATA YOICHI
TESHIROGI SATORU
HACHINAGA MORIJI
KANEKO TETSUYA
IWATA YOICHI
TESHIROGI SATORU
Application Number:
JP31566794A
Publication Date:
June 04, 1996
Filing Date:
November 25, 1994
Export Citation:
Assignee:
HONDA MOTOR CO LTD
International Classes:
F01N3/20; F01N3/24; F01N11/00; F02D21/08; F02D41/14; F02B77/08; (IPC1-7): F01N3/20; F01N3/24; F02B77/08; F02D41/14
Attorney, Agent or Firm:
Toshihiko Watanabe
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