Title:
排気浄化触媒の劣化状態診断装置
Document Type and Number:
Japanese Patent JP4411755
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To allow a diagnostic apparatus for the deteriorated condition of an exhaust purifying catalyst to precisely determine if the purifying ability of the catalyst has decreased. SOLUTION: The diagnostic apparatus includes the exhaust purifying catalyst 6 provided in the exhaust passage 3 of an internal combustion engine; an air-fuel ratio control means 201 for causing an exhaust air-fuel ratio upstream of the catalyst 6 to vary periodically about a reference value in the vicinity of a stoichiometric air-fuel ratio; an exhaust sensor 3a for detecting a quantity of state related to an exhaust air-fuel ratio downstream of the catalyst 6; and a diagnostic means 202 for calculating the rich side amplitude of an output from the exhaust sensor 3a with respect to a reference value and diagnosing the catalyst 6 for its deteriorated condition according to the rich side amplitude.
Inventors:
Yasuki Tamura
Takuya Okamoto
Kojiro Okada
Takuya Okamoto
Kojiro Okada
Application Number:
JP2000216477A
Publication Date:
February 10, 2010
Filing Date:
July 17, 2000
Export Citation:
Assignee:
MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA
International Classes:
F01N3/20; F02D45/00; F01N3/24; F02D41/14
Domestic Patent References:
| JP3293544A |
Attorney, Agent or Firm:
Yu Sanada