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W. Hofbauer, P. Dolovai, H. Jörgl et al.:
"Kalman-Bucy-Filter Design for a Gas Engine";
Talk: IASTED 8th Conference on "Intelligent Systems and Control", Cambridge, MA, USA; 2005-10-31 - 2005-11-02; in: "Intelligent Systems and Control", W. Hofbauer (ed.); IASTED, 497 (2005), ISBN: 0-88986-519-1; Paper ID 084, 6 pages.

The dynamics of a gas engine vary strongly over its power
range while controlling engine speed. The major nonlinearities
result from the turbo charger driven by exhaust gas
and the recirculation valve of the compressor, which leads
part of the compressed mixture back to the inlet to decrease
the mass flow which enters the engine. In order to obtain
a linear state feedback control, suitable states have to be
determined and unmeasured states must be estimated in an
acceptable way. This paper shows that a linear Kalman-
Bucy-filter is able to estimate the states even at other operating
points despite the engine´s nonlinearities. LQG conrol
design is chosen to optimize the speed control by the
actuators throttle and recirculation valve.

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