Title:
窒素酸化物吸蔵触媒の性能劣化を評価する方法
Document Type and Number:
Japanese Patent JP4554737
Kind Code:
B2
Abstract:
From the instant of changeover, rich regeneration is prolonged beyond the requirement for complete desorption of nitrogen oxides from the catalyst, until rich exhaust gas breaks through. The time DELTA t1, changeover to breakthrough, is measured during lean burn, the time DELTA t2 to oxygen breakthrough is similarly measured. Intervals DELTA t1, DELTA t2 are used independently to assess oxygen and nitrogen oxides storage functionalities. Preferred features: The rich phase is prolonged by 1.0-10 times the interval to the first breakthrough of rich exhaust, using a fresh catalyst. During rich running, the air fuel ratio is adjusted between 0.99 and 0.7. Intervals DELTA t1 and DELTA t2 are measured with a rapid response lambda sensor or a linear lambda sensor. They are alternatively determined using a rapid response lambda sensor before and after the catalyst.
Inventors:
Wolfgang Strelau
Rotor mussman
Ulrich Goebel
Rotor mussman
Ulrich Goebel
Application Number:
JP10572999A
Publication Date:
September 29, 2010
Filing Date:
April 13, 1999
Export Citation:
Assignee:
Umicore AG & Co.KG
International Classes:
F01N3/20; B01D53/94; F01N3/08; F01N3/24; F01N3/28; F01N9/00; F01N11/00; F02D41/04; F02D41/14
Domestic Patent References:
| JP8260949A |
Attorney, Agent or Firm:
Kawabe Sachiyo
Toshio Yano
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Toshio Yano
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard