DocumentCode :
3299446
Title :
A non linear observer for fuel film dynamics into the intake manifold of a spark ignition engine
Author :
Arsie, I. ; Pianese, C. ; Rizzo, G.
Author_Institution :
Dept. of Mech. Eng., Salerno Univ., Italy
fYear :
1999
fDate :
1999
Firstpage :
251
Lastpage :
256
Abstract :
A nonlinear observer, based on an extended Kalman filter, is presented for the estimation of the nonlinear fuel film dynamics into the intake manifold of a spark ignition engine. In order to meet the stringent limits imposed on automotive exhaust emissions, electronic engine control systems have to constrain air-fuel ratio in a narrow band around the stoichiometric value, since even a small excursion results in a large degradation of catalyst conversion efficiency. A two states dynamic model is used to describe liquid and vapour fuel mass flows into the intake manifold, accounting for both the partial impingement of the injected liquid fuel on the manifold walls and the evaporation process. The application of an extended Kalman filter allows to deduce a minimum error estimate of both model states (liquid and vapour fuel mass) and parameters (evaporation time constant and injected liquid fraction impinging the wall) utilizing the knowledge of system dynamics and the UEGO sensor measurement at exhaust location. The observer has been tested on a set of 35 air-fuel ratio dynamic transients showing a good prediction level with respect to engine fuel flow and air-fuel ratio. Moreover the trend of estimated model parameters vs. operating conditions is consistent with the physical phenomena taking place in the region interested by the fuel injection process
Keywords :
Kalman filters; film flow; filtering theory; internal combustion engines; nonlinear estimation; observers; two-phase flow; UEGO sensor measurement; air-fuel ratio; air-fuel ratio dynamic transients; catalyst conversion efficiency degradation; electronic engine control systems; evaporation time constant; extended Kalman filter; injected liquid fraction; intake manifold; limits imposed on automotive exhaust emissions; liquid fuel mass flow; minimum error estimate; nonlinear fuel film dynamics estimation; nonlinear observer; spark ignition engine; two-state dynamic model; vapour fuel mass flow; Automotive engineering; Control systems; Degradation; Engines; Fuels; Ignition; Manifolds; Narrowband; Sparks; Vehicle dynamics;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Advanced Intelligent Mechatronics, 1999. Proceedings. 1999 IEEE/ASME International Conference on
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-5038-3
Type :
conf
DOI :
10.1109/AIM.1999.803514
Filename :
803514
Link To Document :
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