Page 64 - Methods For Monitoring And Diagnosing The Efficiency Of Catalytic Converters A Patent - oriented Survey
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46 Methods for Monitoring and Diagnosing the Efliciency of Catalytic Converters
rich
-
(100 mV
Downstream of
New catalyst
lean
Fig. 18 (from DE4039762)
In GB2254939 (1992). the evaluation parameter of aging of a catalytic converter is the
difference of an actual and a simulated L value of a downstream sensor. The estimation of the
simulated value involves the measurement of the air mass flow inducted by the engine and
computation of the oxygen flow to the engine (by multiplying the air mass flow by a factor k
indicating the mass of oxygen in air).
where:
