Article,
Modeling of a three-way catalytic converter with respect to fast transients lambda-sensor relevant exhaust gas components
Industrial & Engineering Chemistry Research, 43 (16): 4780-4788 (August 2004)
Abstract
For the control of three-way catalytic converters (TWCs), simplified
models of not only the TWC but also the lambda-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
lambda-sensor signal, such as H-2 and O-2, 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.
