Page 78 - Methods For Monitoring And Diagnosing The Efficiency Of Catalytic Converters A Patent - oriented Survey
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60 Methods for Monitoring and Diagnosing the Efticiency of Catalytic Converters
exceeded (fig. 27b). the catalytic converter should be replaced, because the smaller the
amplitude of this signal, the more complete has been the conversion of the exhaust gases in the
catalytic converter. The averaged value of the downstream probe is also determined and it
should fall in a predefined range A (fig. 27). In the case where the averaged signal does not fall
in this range A (fig. 27c), the operating point of the control system is changed for such a length
of time until the downstream probe has reached a desired value
rnVc
rnVolts
;onbol Drobe test probt
9 Time b) Ti me
C) Time
Fig. 27 (from US4622809)
