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A Comparison of Three Ion Sensing Circuits in a Homogeneous Charge Compression Ignition Engine

Phan, Tung M. and Mack, J. Hunter and Butt, Ryan H. and Dibble, Robert W. (2017) A Comparison of Three Ion Sensing Circuits in a Homogeneous Charge Compression Ignition Engine. Combustion Science and Technology, 189 (8). pp. 1294-1306. ISSN 0010-2202. doi:10.1080/00102202.2017.1294587.

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The use of a spark plug ion sensor to detect combustion timing in a homogeneous charge compression ignition (HCCI) engine is a technique that could alleviate the need for pressure transducers, a more expensive alternative. One disadvantage of this approach is the difficulty in obtaining a strong signal at lower equivalence ratios. This article addresses and compares three ion sensing circuitries, namely a voltage follower, a notch filter circuit that removes the 60-Hz wall noise, and a notch filter whose output is coupled to a custom-built “integrator” circuit. The circuit optimizations are aimed at improving signal strength and reliability. The ion signal present in the combustion chamber is experimentally investigated in a 1.9-L Volkswagen engine, modified for HCCI operation and fueled with gasoline. Experiments are conducted across different intake temperatures, pressures, and equivalence ratios. It was found that the custom-built circuit provided the best ion signal strength and reliability.

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Additional Information:© 2017 Taylor & Francis. Received 12 Jul 2016, Accepted 09 Feb 2017, Accepted author version posted online: 14 Feb 2017, Published online: 14 Feb 2017.
Subject Keywords:Circuits, Engine, Homogeneous charge compression ignition (HCCI), Ion signal, Sensor
Issue or Number:8
Record Number:CaltechAUTHORS:20170511-143747031
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77380
Deposited By: Tony Diaz
Deposited On:12 May 2017 23:15
Last Modified:15 Nov 2021 17:30

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