Modeling of a Three-Way Catalytic Converter with Respect to Fast Transients of λ-Sensor Relevant Exhaust Gas Components

• Published in: Industrial & engineering chemistry research Vol. 43; no. 16; pp. 4780 - 4788
• Main Authors: Auckenthaler, Theophil S, Onder, Christopher H, Geering, Hans P, Frauhammer, Jörg
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 04.08.2004
• Subjects: Applied sciences; Chemical engineering; Exact sciences and technology; Catalytic converter; Modeling; Exhaust gas
• ISSN: 0888-5885; 1520-5045
• DOI: 10.1021/ie034242u

For the control of three-way catalytic converters (TWCs), simplified models of not only the TWC but also the λ-sensors upstream and downstream of the TWC are required. The accurate interpretation of the sensor signals makes the correction or online identification of model parameters possible. Thus, a precise estimate of the species that mainly drive the sensor's output is indispensable. To gain insight into the main reactions driving the TWCs' behavior, a model derived from the literature has been applied and adjusted to measured exhaust gas transients. These were obtained from fast gas measurement devices, where all components have been measured with T 90 < 30 ms. Apart from the components that are under the regime of legislation, such as NO, CO, and HC, also species that significantly influence the λ-sensor signal, such as H2 and O2, have been measured. The model agrees well with the measurements and can thus be used as a starting point toward control-oriented (simplified) modeling of TWCs.