A model is described that is a part of a global mean value dynamic model for spark ignition engines with electronic control systems for the prediction of fuel consumption and emissions during driving cycles, considering air and fuel flow dynamics in the intake manifold and unsteady cylinder wall temperature effects on exhaust emissions. The results of an identification analysis on a multi-point injection engine are presented in order to validate air and fuel flow submodels. From this analysis a marked dependence between the liquid fuel fraction deposited on manifold wall and engine load has been noticed while the fuel evaporation time constant is weakly influenced by engine torque.
Identification of a dynamic model for transient mixture formation in a multi-point spark ignition engine
PIANESE, Cesare;RIZZO, Gianfranco
1994-01-01
Abstract
A model is described that is a part of a global mean value dynamic model for spark ignition engines with electronic control systems for the prediction of fuel consumption and emissions during driving cycles, considering air and fuel flow dynamics in the intake manifold and unsteady cylinder wall temperature effects on exhaust emissions. The results of an identification analysis on a multi-point injection engine are presented in order to validate air and fuel flow submodels. From this analysis a marked dependence between the liquid fuel fraction deposited on manifold wall and engine load has been noticed while the fuel evaporation time constant is weakly influenced by engine torque.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
