Modeling, Identification, and Separation of Crankshaft Dynamics in a Light-Duty Diesel Engine 2009-01-1798
Mathematical models of a torque sensor equipped crankshaft in a light-duty diesel engine are identified, validated, and compared. The models are based on in-cylinder pressure and crankshaft torque data collected from a 5-cylinder common-rail diesel engine running at multiple operating points. The work is motivated by the need of a crankshaft model in a closed-loop combustion control system based on crankshaft torque measurements. In such a system a crankshaft model is used in order to separate the measured crankshaft torque into cylinder individual torque contributions. A method for this is described and used for IMEP estimation.
Not surprisingly, the results indicate that higher order models are able to estimate crankshaft torque more accurately than lower order models, even if the differences are small. For IMEP estimation using the cylinder separation method however, these differences have large effects on accuracy. Here, the performance of higher order models is significantly better than for lower order models. Also, models of odd model order perform better than models of even model order. On average, a 9th order model estimates IMEP values to within 2-3% of the reference values.
Citation: Thor, M., Andersson, I., and McKelvey, T., "Modeling, Identification, and Separation of Crankshaft Dynamics in a Light-Duty Diesel Engine," SAE Technical Paper 2009-01-1798, 2009, https://doi.org/10.4271/2009-01-1798. Download Citation
Author(s):
Mikael Thor, Ingemar Andersson, Tomas McKelvey
Affiliated:
Chalmers University of Technology
Pages: 7
Event:
Powertrains, Fuels and Lubricants Meeting
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Diesel / compression ignition engines
Mathematical models
Crankshafts
Engine cylinders
Combustion and combustion processes
Control systems
Simulation and modeling
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