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Extracting Cylinder Individual Combustion Data from a High Precision Torque Sensor

Aulin, Hans; Tunestål, Per LU ; Johansson, Thomas LU and Johansson, Bengt LU (2010) Fall Technical Conference of the ASME Internal Combustion Engine Division, 2010 In Proceedings of the ASME Internal Combustion Engine Division Fall Technical Conference p.619-625
Abstract
A high precision torque sensor is used for extracting combustion timing information from cylinder individual pressure estimates constructed from the torque measurements. A combination of physics-based and data driven modeling is used where the physical part of the model is based on equations describing contributions of inertial and gas forces while the flexing of the crankshaft, which has rather complex dynamics, is modeled using the data driven approach. The first part of the study shows the derivation of the models and how well the torque at the sensor position can be estimated from the pressures in the four cylinders. The second part demonstrates how it is possible to reconstruct cylinder individual torque and pressure by inverting the... (More)
A high precision torque sensor is used for extracting combustion timing information from cylinder individual pressure estimates constructed from the torque measurements. A combination of physics-based and data driven modeling is used where the physical part of the model is based on equations describing contributions of inertial and gas forces while the flexing of the crankshaft, which has rather complex dynamics, is modeled using the data driven approach. The first part of the study shows the derivation of the models and how well the torque at the sensor position can be estimated from the pressures in the four cylinders. The second part demonstrates how it is possible to reconstruct cylinder individual torque and pressure by inverting the pressure to torque model. Going from measured torque to pressure in each cylinder is not trivial since the inverted model is ill conditioned around top dead centre which causes large errors where the precision is the most needed. A parameterized combustion model is therefore introduced to improve the signal to noise ratio in the estimated parameters. The proposed method for detecting combustion demonstrated good results with a coefficient of determination of 0.95 against "true" combustion phasing. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Proceedings of the ASME Internal Combustion Engine Division Fall Technical Conference
pages
619 - 625
publisher
American Society Of Mechanical Engineers (ASME)
conference name
Fall Technical Conference of the ASME Internal Combustion Engine Division, 2010
external identifiers
  • WOS:000290505600060
  • Scopus:80054791240
ISBN
978-0-7918-4944-6
DOI
10.1115/ICEF2010-35101
language
English
LU publication?
yes
id
db38f979-f7c7-4c13-a2d7-bfa192723fd0 (old id 1984603)
date added to LUP
2011-07-11 10:09:09
date last changed
2017-01-01 08:06:27
@inproceedings{db38f979-f7c7-4c13-a2d7-bfa192723fd0,
  abstract     = {A high precision torque sensor is used for extracting combustion timing information from cylinder individual pressure estimates constructed from the torque measurements. A combination of physics-based and data driven modeling is used where the physical part of the model is based on equations describing contributions of inertial and gas forces while the flexing of the crankshaft, which has rather complex dynamics, is modeled using the data driven approach. The first part of the study shows the derivation of the models and how well the torque at the sensor position can be estimated from the pressures in the four cylinders. The second part demonstrates how it is possible to reconstruct cylinder individual torque and pressure by inverting the pressure to torque model. Going from measured torque to pressure in each cylinder is not trivial since the inverted model is ill conditioned around top dead centre which causes large errors where the precision is the most needed. A parameterized combustion model is therefore introduced to improve the signal to noise ratio in the estimated parameters. The proposed method for detecting combustion demonstrated good results with a coefficient of determination of 0.95 against "true" combustion phasing.},
  author       = {Aulin, Hans and Tunestål, Per and Johansson, Thomas and Johansson, Bengt},
  booktitle    = {Proceedings of the ASME Internal Combustion Engine Division Fall Technical Conference},
  isbn         = {978-0-7918-4944-6},
  language     = {eng},
  pages        = {619--625},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  title        = {Extracting Cylinder Individual Combustion Data from a High Precision Torque Sensor},
  url          = {http://dx.doi.org/10.1115/ICEF2010-35101},
  year         = {2010},
}