Ion current sensing-based lean blowout detection for a pulse combustor

2017 ◽  
Vol 176 ◽  
pp. 263-271 ◽  
Author(s):  
Fangyan Li ◽  
Lijun Xu ◽  
Minglong Du ◽  
Lijun Yang ◽  
Zhang Cao
Keyword(s):  
Ion Current ◽  
Current Sensing ◽  
Lean Blowout ◽  
Pulse Combustor

Replacing Mechanized Oxyfuel Cutting Sensors With Ion Current Sensing

2017 ◽  
Author(s):  
Christopher R. Martin
Keyword(s):  
Flow Rate ◽  
Ion Current ◽  
Work Piece ◽  
Active Sensing ◽  
Electrical Characteristics ◽  
Current Sensing ◽  
Additional Work ◽  
Oxygen Ratio

This paper describes a method using electrical characteristics of the torch, flame, and work piece to replace active sensing elements most commonly used for mechanized oxyfuel cutting applications; height, fuel/oxygen ratio, work temperature, and preheat flow rate. Calibrations are given for the torch under test for standoff accurate to ±1/32 in (0.8 mm) and F/O ratio accurate to ±.008. Methods are proposed for balancing flow across multi-torch systems, and detecting the work kindling temperature. Additional work is needed if calibrated flow and work temperatures are to be measured electrically.

scholarly journals Using Ion-current Sensing to Interpret Gasoline HCCI Combustion Processes

2006 ◽  
Author(s):  
Dimitris Panousakis ◽  
Andreas Gazis ◽  
Jill Patterson ◽  
Rui Chen ◽  
Jamie Turner ◽  
...  
Keyword(s):  
Ion Current ◽  
Current Sensing ◽  
Hcci Combustion ◽  
Combustion Processes

Prediction of equivalence ratio in pulse combustor from ion current amplitude spectrum

Fuel ◽  
2018 ◽  
Vol 218 ◽  
pp. 179-187 ◽  
Author(s):  
Fangyan Li ◽  
Zhang Cao ◽  
Lijun Xu ◽  
Yixin Xie
Keyword(s):  
Equivalence Ratio ◽  
Amplitude Spectrum ◽  
Current Amplitude ◽  
Ion Current ◽  
Pulse Combustor

3D CFD Modeling and Validation of Ion Current Sensor in a Gen-Set Diesel Engine Using Chemical Kinetic Mechanism

2016 ◽  
Author(s):  
Tamer Badawy ◽  
Naeim Henein
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Diesel Engines ◽  
Combustion Process ◽  
Ion Current ◽  
Cfd Modeling ◽  
Ionization Mechanism ◽  
Current Signal ◽  
Current Sensing ◽  
Cycle Simulation

The control of the combustion process is becoming a necessity for diesel engines in order to meet the upcoming stringent emission regulations. Ion current sensing technology has the potential to provide real-time feedback of the combustion process while using a fairly inexpensive sensor. 3D computational fluid dynamics (CFD) cycle simulation is becoming more complementary in understanding the complex combustion process in diesel engines. In this paper, a CFD study is focused on investigating the characteristics of the ion current signal produced during the combustion process of a Gen-set turbocharged diesel engine. Multiple virtual ion sensing probes are defined in different locations inside the combustion chamber to understand the influence of sensor location on signal characteristics. The n-heptane reaction mechanism and NO mechanism, combined with an ionization mechanism developed at WSU with 11 species, are used in the model to predict the chemical kinetics of combustion and the mole fraction of ionized species produced during combustion. Since the charge in diesel engines is heterogeneous and due to the sensing nature of the ion sensor, this paper explores the effect of sensor sensing diameter and its protrusion depth inside the combustion chamber on the ion current signal development. The simulation is validated by comparing in-cylinder pressure traces, the rate of heat release, and the ion current signal. Further, the model results are validated under different engine loads and injection pressures. This study utilizes the ionization mechanism to give further understanding of the complex formation of ionization species and their amplitudes, particularly at local sensing locations. This can be very vital to identify the potentials of using the ion current sensing and highlight its viability in feedback closed loop combustion control.

Spark Control for Ion Current Sensing

2016 ◽  
pp. 204-213
Author(s):  
Tycho Weißgerber ◽  
Gregor Kortendiek
Keyword(s):  
Ion Current ◽  
Current Sensing

Ion Current Sensing for Spark Ignition Engines

1999 ◽  
Author(s):  
Jürgen Förster ◽  
Achim Günther ◽  
Markus Ketterer ◽  
Klaus-Jürgen Wald
Keyword(s):  
Spark Ignition ◽  
Ion Current ◽  
Spark Ignition Engines ◽  
Current Sensing

Ignition System Integrated AC Ion Current Sensing for Robust and Reliable Online Engine Control

2000 ◽  
Author(s):  
H. Wilstermann ◽  
A. Greiner ◽  
P. Hohner ◽  
R. Kemmler ◽  
R. R. Maly ◽  
...  
Keyword(s):  
Ion Current ◽  
Engine Control ◽  
Current Sensing ◽  
Ignition System

Individual Cylinder Knock Detection Based on Ion Current Sensing: Correlation Analysis

2006 ◽  
Author(s):  
Nicolo` Cavina ◽  
Giacomo Po ◽  
Luca Poggio ◽  
Daniele Zecchetti
Keyword(s):  
Real Time ◽  
High Performance ◽  
Ion Current ◽  
Spark Ignition Engines ◽  
Cylinder Pressure ◽  
Current Sensing ◽  
Related Information ◽  
Output Torque ◽  
Definition Of ◽  
Engine Components

This paper addresses issues related with the measurement, analysis and real-time control of knocking combustions in high-performance spark-ignition engines. In particular, the relationship between output torque and knock intensity has been investigated. Issues examined include a methodology for identifying target knocking levels, and a critical comparison of different signals for extracting knock-related information. When considering high-performance spark-ignition engines, individual cylinder spark advance management that allows maximum output torque while protecting engine components from knock-related damage, is particularly complex. The first part of the activity is focused on an analysis aimed at the identification of a knocking level that allows reaching maximum performance while protecting engine components: For a given engine operating condition, such knocking level is shown to be constant for all the engine cylinders, and it is directly measurable through knock intensity indexes obtained by post-processing the in-cylinder pressure signal. If such knocking level is to be achieved during on-board operation, it is necessary to real-time reconstruct individual cylinder pressure-based knock indexes values. One of the main objectives of this work is therefore the evaluation of the impact that the adoption of an ion current sensing system would have on the performance of such a spark advance controller. The background of the second part of the work is the knocking-related information that can be extracted by real-time processing engine block vibration signals. The main drawbacks of such approach are related to the definition of the minimum number of sensors to be installed, to the evaluation of their optimal position, and to the signal-to-noise ratio typical of such systems, which becomes critical especially at high engine speeds. Possible solutions are the use of in-cylinder pressure or ion current sensors installed on board the vehicle. This work is mainly focused on ion sensing application, due to the still existing cost and reliability problems associated with the onboard application of in-cylinder pressure measuring systems. The second part of the work therefore deals with the correlation analysis between pressure based and ion current based knock intensity indexes. The experimental tests have been performed on a V12 6.0 liter and on a V12 6.2 liter high performance engines: Large spark advance sweeps were performed for each speed breakpoint, while acquiring 6 in-cylinder pressure and 6 ion current signals. Several indexes were extracted from both type of signals, in order to achieve both maximum correlation levels and physical consistency with knock-related damage. The results are particularly encouraging, since the correlation levels between pressure-based and ion current-based knock indexes are very high, thus allowing the definition of a closed-loop individual cylinder spark advance controller able to achieve the target knocking level.

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