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Technical Paper

Parameterized Diesel Engine Combustion Modeling for Torque Based Combustion Property Estimation

2012-04-16
2012-01-0907
Combustion model structures based on Vibe functions are outlined and investigated in this work. The focus of the study is the use of such model structures for estimation of diesel combustion properties by reconstructing in-cylinder pressure from measurements of crankshaft torque. Investigated combustion properties include the start and phasing of the combustion as well as maximum values of the in-cylinder pressure and its derivative. The accuracy associated with the proposed estimation method is evaluated using ideal torque data, i.e. torque calculated from in-cylinder pressure, that is generated using both simulations and experiments. The results indicate that the uncertainty associated with the estimation of a selected combustion property tends to increase if that property is located close to TDC, where the signal-to-noise ratio is low for a torque signal.
Technical Paper

Backstepping Control with Integral Action Applied to Air-to-Fuel Ratio Control for a Turbocharged Diesel Engine

2002-03-04
2002-01-0195
The problem of controlling the air-to-fuel ratio of a diesel engine by utilizing the potential of a variable geometry turbine is addressed in this paper. The proposed control law is derived from a backstepping procedure and ensures a local optimal performance close to the operating point. Accurate air-to-fuel ratio is important for emission reduction in diesel engines, therefore is integral action included in the control law to mitigate the effects of constant disturbance inputs or parameter (model) errors. The performance is illustrated by an analytical example.
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