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1. (WO1994028292) CATALYST EFFECTIVENESS CHECKING PROCESS

Pub. No.:    WO/1994/028292    International Application No.:    PCT/EP1994/001697
Publication Date: Dec 8, 1994 International Filing Date: May 25, 1994
IPC: F01N 11/00
F02D 41/14
Applicants: SIEMENS AKTIENGESELLSCHAFT
ACHLEITNER, Erwin
Inventors: ACHLEITNER, Erwin
Title: CATALYST EFFECTIVENESS CHECKING PROCESS
Abstract:
A process for checking the effectiveness of a catalyst uses an oxygen probe arranged uptstream of the catalyst and an oxygen probe arranged downstream of the catalyst. The ratio between the times when the oxygen probes downstream and upstream of the catalyst display rich or poor mixture values is calculated. The effectiveness of the catalyst is sufficient when the smaller ratio value is smaller than a predetermined threshold value.