Gas flow observer for Diesel Engines with EGR
Due to stricter emission legislation, there is a need for
more efficient control of diesel engines with exhaust gas
recirculation(EGR). In particular, it is important to estimate the
air/fuel ratio accurately in transients. Therefore a new engine gas
flow model has been developed. This model divides the gas into one
part for oxygen and one part for inert gases. Based on this model an
observer has been designed to estimate the oxygen concentration in
the gas going into the engine, which can be used to calculate the
air/fuel ratio. This observer can also be used to estimate the
intake manifold pressure. The advantage of estimating the pressure,
instead of low pass filtering the noisy signal, is that the observer
does not cause time delay.
Fredrik Swartling
2005

Informationsansvarig: webmaster
Senast uppdaterad: 2021-11-10