Page 164 - Methods For Monitoring And Diagnosing The Efficiency Of Catalytic Converters A Patent - oriented Survey

146 Methods for Monitoring and Diagnosing the Efficiency of Catalytic Converters

load imposed upon an engine (for example, an intake aidfuel quantity) and a value detected by
a sensor for detecting the engine speed.

2
F

Fig. 67 (from US5341642)

The deterioration diagnosing means is provided for evaluating the similarity in accordance with
a correlation function. It mainly comprises a single chip microcomputer having an A/D