Istraživanje i razvoj metode za analizu radnog procesa motora na osnovu merenja trenutne ugaone brzine kolenastog vratila
Author
Popović, SlobodanMentor
Tomić, MiroljubCommittee members
Adžić, Miroljub
Pešić, Radivoje

Vencl, Aleksandar

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Show full item recordAbstract
Proces sagorevanja kod motora SUS najčešće se simulira Vibeovim
parametarskim modelom. Parametri modela zavise od geometrijskih
karakteristika komore i termo- i gaso-dinamičkih pojava u cilindru, zbog
čega se korišćenjem empirijskih relacija njihove vrednosti ne mogu
odrediti lako i sa dovoljnom tačnošću. Osim determinističkih metoda
koje ne omogućuju sistemski pristup, za odreĎivanje parametara modela
oslobaĎanja toplote koriste se i indirektni postupci zasnovani na
minimizaciji greške izmeĎu vrednosti modeliranog i izmerenog pritiska u
cilindru. U ovom radu prkazan je postupak identifikacije parametara
modela oslobaĎanja toplote na primeru višecilindarskog benzinskog
motora primenom optimizacione metode Levenberg-Markvart sa fiksnim
ograničenjima za minimizaciju sume kvadrata razlika izmerene i
modelirane trenutne ugaone brzine kolensatog vratila. Pritisak u cilindru
i moment gasne sile u ugaonom domenu simuliran je pomoću
nelinearnog dvozonskog, nultodimenzionalnog mod...ela radnog procesa.
Moment mehaničkih gubitaka u ugaonom domenu simuliran je pomoću
detaljnog, višekomponentnog analitičkog modela trenja u tribološkim
sistemima motora. Razvijeni modeli iskorišćeni su za analizu uticaja
parametara dinamičkog modela motora na tok trenutne ugaone brzine
kolenastog vratila i istraživanje odstupanja u merenjima radi definisanja
ograničenja u procesu identifikacije parametara modela
Most frequently used approach to describe combustion process in IC
engines is based on Wiebe function. Its parameters are strongly
influenced by geometric and in-cylinder gas- and thermodynamic
processes and can’t be predicted easily and with sufficient accuracy
using available empirical relations. Along with deterministic methods
lacking in systematic approach, indirect analysis methods based on
minimization of error between simulated and measured in-cylinder
pressure have been successfully demonstrated. In this paper the same
concept is introduced to identify combustion model parameters of a
multi-cylinder SI engine based on box constrained Levenberg-Marquardt
minimization of nonlinear Least Squares (LSQ) given for measured and
simulated instantaneous crankshaft angular speed determined from the
solution of the engine dynamics torque balance equation. For predictions
of gas pressure and engine torque, a nonlinear, detailed, angle resolved
two-zone, zero-dimensional mult...i-cylinder SI engine combustion model
has been developed as well as a detailed analytical component model of
engine friction and mechanical losses. The models are used to analyze
the influences of engine combustion and dynamics model parameters on
instantaneous crankshaft speed and to investigate biases in measurement
in order to recognize and establish the constraints in process of
combustion model parameters identification
Faculty:
Универзитет у Београду, Машински факултетDate:
07-05-2013Projects:
- Development of CHP demo facility with biomass gasification (RS-33049)
- Research and development of alternative fuel and drive systems for urban buses and refuse vehicles with regard to the improvements of energy efficiency and environmental characteristics (RS-35042)