Title:
触媒の診断方法および装置
Document Type and Number:
Japanese Patent JP2005524014
Kind Code:
A
Abstract:
A method for diagnosing a catalytic converter ( 7 ), which is arranged in an exhaust-gas system ( 6 ) of an internal combustion engine ( 1 ) has the steps of: detecting the signal (USHK) of an exhaust-gas probe ( 9 ) downstream of the catalytic converter; forming a limit value model amplitude (AHKF) from at least one quantity (ML, n) which occurs upstream of the catalytic converter ( 7 ); forming a catalytic converter evaluation quantity (DKATI) whose value increases with increasing deviation of the amplitude (AHK) of the signal (USHK) from the limit value model amplitude (AHKF); evaluating the operability of the catalytic converter ( 7 ) on the basis of the catalytic converter evaluation quantity (DKATI); stopping the evaluation when an oxygen-dependent catalytic converter load (KATIN) exceeds or drops below a threshold value. The method is characterized in that the threshold value is pregiven in dependence upon the signal (USHK) of the exhaust-gas probe ( 9 ) rearward of the catalytic converter.
More Like This:
Inventors:
Vakerou, Rene
Schneider, Erich
Schneider, Erich
Application Number:
JP2003588063A
Publication Date:
August 11, 2005
Filing Date:
December 07, 2002
Export Citation:
Assignee:
ROBERT BOSCH GMBH
International Classes:
F01N3/20; F01N11/00; (IPC1-7): F01N3/20
Attorney, Agent or Firm:
Kazuo Shamoto
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Tadashi Masui
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita