The need for development of a more efficient IC engine is always on the rise which can be related to oil being a non-renewable resource and its increasing carbon foot print causing global warming. In addition to the CO2, there are more toxic pollutants such as NOx, CO and HC due to improper combustion. These demands have paved way for development of alternative fuel engines such as bio-diesel, bio-ethanol and hybrids. Still these engines need to optimise their combustion to get the best of both worlds. And for the purpose of optimisation there must be a means to measure and estimate the combustion characteristics. Thus analysing the combustion noise gives some insight into the performance of the engine. © 2018 Informa UK Limited, trading as Taylor &amp; Francis Group.

Sakthivel G

Mechanical

School of Mechanical Engineering

Chennai Campus

Kalaivanan A.P

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Correlation of combustion noise with ignition-timing in an IC engine

International Journal of Ambient Energy

Electronic Fuel Injection Systems have revolutionised Fuel Delivery and Ignition timing in the past two decades and have reduced the Fuel Consumption and Exhaust Emissions, ultimately enhancing the Economy and Ecological awareness of the engines. But the ignition/injection timing that commands the combustion is mapped to a fixed predefined table which is best suited during the stock test conditions. However continuous real time adjustments by monitoring the combustion characteristics prove to be highly efficient and be immune to varying fuel quality, lack of transient performance and wear related compression losses. For developing countries, Automotive Manufacturers have been Tuning the Ignition/Injection timing Map assuming the worst possible fuel quality. Conventional knock control system focus on engine protection only and doesn't contribute much in improving thermal efficiency. Predefined Ignition tables fail to produce good thermal efficiency during hard acceleration due to their inability to advance for the acceleration. IC Engines wear over time leading to compression losses and a reduced cranking pressure. This reduction in the effective compression ratio raises the need for adjusting the Ignition/Injection Timing. A closed loop ignition/injection timing by monitoring combustion characteristics can compensate for such issues and maintain a consistent thermal efficiency in all operating conditions. The algorithm implements genetic mutation approach to create a correction factor for ignition timing by analysing signals from a knock sensor or an acoustic sensor. It also takes into account, the Acceleration Gradient, MAP, RPM and Air-Fuel Ratio in computing the correction factor. The computation is also optimised to execute with in an engine cycle even at high RPM. Copyright © 2017 SAE International.

SAE Technical Paper Series

Self Tuning Genetic Algorithm to Achieve Maximum Thermal Efficiency by Monitoring Combustion Characteristics with Vibration/Acoustic Sensors

Research on Combustion Noise for Controlled Auto Ignition Engine Fueled with Natural Gas Effect of Stroke Bore Ratio and Ignition Timing

Engine Acoustic Emission Used as a Control Input: Applications to Diesel Engines

IFAC-PapersOnLine

Closed Loop Knock Intensity Characteristics of a Classical Knock Control System

SAE International Journal of Engines

Method Using Multiple Regression Analysis to Separate Engine Radiation Noise into the Contributions of Combustion Noise and Mechanical Noise in the Time Domain

Journal	International Journal of Ambient Energy
Publisher	Informa UK Limited
ISSN	0143-0750
Open Access	0