An integrated model-based three-way catalyst control and diagnostic monitoring system is described which has the potential for improved health discrimination while also significantly reducing the calibration burden. The catalyst is modeled as a simple limited integrator with an adaptive integral gain. The adaptive gain, used in the control system, is also used as a diagnostic metric since (among other variables) it reflects the catalyst oxygen storage capacity and hence the health of the system. The method has been applied to a 4.6 liter ULEV II gasoline engine, and tested over an EPA Federal Test Procedure drive cycle with a number of differently aged catalysts. Preliminary results are encouraging, and show that the method is able to discriminate between the catalysts, even those with similar age near the OBD threshold.
Catalyst Diagnostics Using Adaptive Control System Parameters
Sae Technical Papers
SAE 2006 World Congress & Exhibition ; 2006
03.04.2006
Aufsatz (Konferenz)
Englisch
2006-01-1070 Catalyst Diagnostics Using Adaptive Control System Parameters
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