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Chinese Journal of Engineering
Volume 2014 (2014), Article ID 102390, 8 pages
Research Article

Study of Knocking Effect in Compression Ignition Engine with Hydrogen as a Secondary Fuel

1Department of Mechatronics, SNS College of Technology, Coimbatore, India
2Department of Mechatronics, Kongu Engineering College, Perundurai, Erode, India

Received 5 November 2013; Accepted 3 December 2013; Published 24 February 2014

Academic Editors: Z. Li and Z. Sha

Copyright © 2014 R. Sivabalakrishnan and C. Jegadheesan. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The aim of this project is detecting knock during combustion of biodiesel-hydrogen fuel and also the knock is suppressed by timed injection of diethyl ether (DEE) with biodiesel-hydrogen fuel for different loads. Hydrogen fuel is an effective alternate fuel in making a pollution-free environment with higher efficiency. The usage of hydrogen in compression ignition engine leads to production of knocking or detonation because of its lower ignition energy, wider flammability range, and shorter quenching distance. Knocking combustion causes major engine damage, and also reduces the efficiency. The method uses the measurement and analysis of cylinder pressure signal for various loads. The pressure signal is to be converted into frequency domain that shows the accurate knocking combustion of fuel mixtures. The variation of pressure signal is gradually increased and smoothly reduced to minimum during normal combustion. The rapid rise of pressure signal has occurred during knocking combustion. The experimental setup was mainly available for evaluating the feasibility of normal combustion by comparing with the signals from both fuel mixtures in compression ignition engine. This method provides better results in predicting the knocking feature of biodiesel-hydrogen fuel and the usage of DEE provides complete combustion of fuels with higher performance, and lower emission.