Processing the knock sensor's signal is the most common approach for knock detection in series production vehicles. Filtration, rectification, and integration in a defined knock window (KW) are main steps to compute the standard knock intensity (SKI). The SKI strongly depends on the engine operating conditions. In this study, a novel model is proposed based on the knock sensor analysis to determine the normalized knock intensity (NKI) with much less dependency on the operating conditions, cylinder numbers (CNs), and KW. Implementing the proposed normalization model, a fixed detection threshold can be used for knock detection at all operating conditions. To verify the model, an accurate knock detection method based on cylinder pressure analysis is utilized, which comprises intensity calculation and a novel technique for detection threshold determination. Experimental results at all operating conditions show a square of correlation coefficient greater than 0.7 when the knock intensity from the presented model is compared with the reference cylinder pressure based method. In addition, the model detects all heavy knocking cycles and there is no wrongly detected knocking combustion.
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June 2016
Research-Article
Normalized Knock Intensity Determination Based on the Knock Sensor Analysis to Have a Fixed Detection Threshold at Different Operating Conditions
Mohammad Momeni Movahed,
Mohammad Momeni Movahed
Department of Mechanical Engineering,
Amirkabir University of Technology,
Tehran 15875-4413, Iran
e-mail: m_momeni@aut.ac.ir
Amirkabir University of Technology,
Tehran 15875-4413, Iran
e-mail: m_momeni@aut.ac.ir
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Hassan Basirat Tabrizi,
Hassan Basirat Tabrizi
Mem. ASME
Department of Mechanical Engineering,
Amirkabir University of Technology,
Tehran 15875-4413, Iran
e-mails: hbtabrizi@gmail.com; hbasirat@aut.ac.ir
Department of Mechanical Engineering,
Amirkabir University of Technology,
Tehran 15875-4413, Iran
e-mails: hbtabrizi@gmail.com; hbasirat@aut.ac.ir
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Seyed Mostafa Agha Mirsalim
Seyed Mostafa Agha Mirsalim
Department of Mechanical Engineering,
Amirkabir University of Technology,
Tehran 15875-4413, Iran
e-mail: mirsalim@csr.ir
Amirkabir University of Technology,
Tehran 15875-4413, Iran
e-mail: mirsalim@csr.ir
Search for other works by this author on:
Mohammad Momeni Movahed
Department of Mechanical Engineering,
Amirkabir University of Technology,
Tehran 15875-4413, Iran
e-mail: m_momeni@aut.ac.ir
Amirkabir University of Technology,
Tehran 15875-4413, Iran
e-mail: m_momeni@aut.ac.ir
Hassan Basirat Tabrizi
Mem. ASME
Department of Mechanical Engineering,
Amirkabir University of Technology,
Tehran 15875-4413, Iran
e-mails: hbtabrizi@gmail.com; hbasirat@aut.ac.ir
Department of Mechanical Engineering,
Amirkabir University of Technology,
Tehran 15875-4413, Iran
e-mails: hbtabrizi@gmail.com; hbasirat@aut.ac.ir
Seyed Mostafa Agha Mirsalim
Department of Mechanical Engineering,
Amirkabir University of Technology,
Tehran 15875-4413, Iran
e-mail: mirsalim@csr.ir
Amirkabir University of Technology,
Tehran 15875-4413, Iran
e-mail: mirsalim@csr.ir
1Corresponding author.
Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received March 9, 2015; final manuscript received September 29, 2015; published online November 17, 2015. Assoc. Editor: Stani Bohac.
J. Eng. Gas Turbines Power. Jun 2016, 138(6): 061501 (9 pages)
Published Online: November 17, 2015
Article history
Received:
March 9, 2015
Revised:
September 29, 2015
Citation
Momeni Movahed, M., Basirat Tabrizi, H., and Mostafa Agha Mirsalim, S. (November 17, 2015). "Normalized Knock Intensity Determination Based on the Knock Sensor Analysis to Have a Fixed Detection Threshold at Different Operating Conditions." ASME. J. Eng. Gas Turbines Power. June 2016; 138(6): 061501. https://doi.org/10.1115/1.4031789
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