scholarly journals Computationally Inexpensive Methods of Ion Current Signal Manipulation for Predicting the Characteristics of Engine In-Cylinder Pressure

2006 ◽  
Vol 7 (3) ◽  
pp. 271-282 ◽  
Author(s):  
A Gazis ◽  
D Panousakis ◽  
R Chen ◽  
W-H Chen
Keyword(s):  
Ion Current ◽  
Cylinder Pressure ◽  
Current Signal

Analysis of ion current signal during negative valve overlap of HCCI combustion with high compression ratio

2020 ◽  
pp. 146808742097289
Author(s):  
Maximilian Wick ◽  
Denghao Zhu ◽  
Jun Deng ◽  
Liguang Li ◽  
Jakob Andert
Keyword(s):  
Combustion Process ◽  
Pressure Sensors ◽  
Ion Current ◽  
Cylinder Pressure ◽  
Combustion Control ◽  
Current Signal ◽  
Hcci Combustion ◽  
High Compression ◽  
Negative Valve Overlap ◽  
Valve Overlap

Homogenous charge compression ignition (HCCI) combustion is a low temperature combustion process which combines high combustion efficiency with ultra-low [Formula: see text] raw emissions. Steep increases of the in-cylinder pressure and unstable combustion sequences at the limits of the operating range can damage the engine and limit the use of HCCI to part load operation. This can be done using closed loop combustion control based on combustion parameters like the indicated mean effective pressure and the combustion phasing. Since in-cylinder pressure sensors are expensive components and therefore not suitable for series application, ion current sensors can be used as an additional source of information about the combustion. Combustion analysis using methods similar to those used in pressure based measurements can be implemented using an online analysis of the ion current signal. In this study, the ion current sensor will be examined for its suitability for combustion control under HCCI conditions with lean air/fuel ratios and high compression ratios. Research has found that the ion current signal is strongly depended on the boundary conditions. Especially the air/fuel ratio which plays an important role for signal strength during the combustion process. When using valve timings with negative valve overlap in combination with a fuel pre-injection, a further peak of the ion current signal close to the gas exchange top dead center can be found in addition to the one during combustion. At the same time, it is hard to extract information from the cylinder pressure signal during NVO. Under lean conditions this peak even exceeds the signal during combustion. This study analyzes the ion current signal during NVO and its potential to be used for future combustion control concepts. The ion current signal shows potential to stabilize HCCI combustion at high loads. However, the prediction of late combustion cycles is still challenging.

Knock and Pre-Ignition Detection Using Ion Current Signal on a Boosted Gasoline Engine

2017 ◽  
Author(s):  
Sunyu Tong ◽  
Zhaohui Yang ◽  
Xiaoyu He ◽  
Jun Deng ◽  
Zhijun Wu ◽  
...  
Keyword(s):  
Gasoline Engine ◽  
Ion Current ◽  
Current Signal

Ion Current Measurements as a Method for the Detection of the Reaction Rate in Combustion With Swirl Stabilized Airblast Injection Systems

2015 ◽  
Author(s):  
J. Christopher Wollgarten ◽  
Nikolaos Zarzalis ◽  
Fabio Turrini ◽  
Antonio Peschiulli
Keyword(s):  
Reaction Rate ◽  
Strong Dependence ◽  
Sampling Rate ◽  
Stability Control ◽  
Ion Current ◽  
Ion Concentration ◽  
Injection System ◽  
Current Signal ◽  
Recirculating Flow ◽  
Lean Combustion

Due to strict emission legislation, the trend in the development of aero-engine gas turbine combustion is heading towards lean burning approaches. Lean combustion reduces the combustion temperatures and therefore also the nitrogen oxides emissions. Unfortunately, lean combustion suffers from instabilities and the operation close to the point of lean blowout increases the risk of imminent blowoff. Active stability control is therefore inevitable. The objective of this work is to evaluate the signal obtained from an ion current measurement technique to enable combustion control for aircraft propulsion applications in the near future. In the past ion current measurements have been used in several studies as flame turbulence analyzer and to detect the reaction rate. However, investigations in lean burning and swirl stabilized airblast injection combustors for future propulsion concepts are rare. The signal obtained from an ion current detector inside a combustor depends strongly on the measurement position. In this experimental investigation field measurements at atmospheric conditions of the ion concentration in a tubular combustor with a sampling rate of 8 kHz are compared with 4 kHz time resolved temperature and OH* chemiluminescence measurements in order to determine the position of the reaction inside the combustor. Variations were performed of the air to fuel ratio (AFR), the air preheating temperature and the pressure drop across the injection system to clarify the interpretation of the ion current signal. The results indicate a strong dependence of the ion current signal on the AFR and that the technique has distinct advantages compared to OH* chemiluminescence measurements: The measurement equipment is comparable non-expensive and the results reveal that the reaction rate is measured directly and are not interpreted from a 3D image. A transition in flame shape from a compact to a tornado flame can be clearly identified with the applied probe. Furthermore, regions with high temperature fluctuations do not necessarily reveal the reaction zone in a recirculating flow field.

scholarly journals Investigation of Correlation Between Ion Current Signal and NOX Emissions in Controlled Auto-ignition Engine

2015 ◽  
Vol 66 ◽  
pp. 85-88
Author(s):  
Yintong Liu ◽  
Liguang Li ◽  
Junyu Ye ◽  
Zhijun Wu ◽  
Jun Deng
Keyword(s):  
Ion Current ◽  
Nox Emissions ◽  
Current Signal ◽  
Auto Ignition

Identification of combustion and detonation in spark ignition engines using ion current signal

Fuel ◽  
2018 ◽  
Vol 227 ◽  
pp. 469-477 ◽  
Author(s):  
Armando A.M. Laganá ◽  
Leonardo L. Lima ◽  
João F. Justo ◽  
Benedito A. Arruda ◽  
Max M.D. Santos
Keyword(s):  
Spark Ignition ◽  
Ion Current ◽  
Spark Ignition Engines ◽  
Current Signal

Analysis and Research on the Influence Factors of the Spark Plug Ion Current in Spark Ignition Engine

2014 ◽  
Vol 1070-1072 ◽  
pp. 1831-1834
Author(s):  
Chang Qing Song ◽  
Jun Li ◽  
Da Wei Qu
Keyword(s):  
Bias Voltage ◽  
Combustion Process ◽  
Influence Factors ◽  
Spark Ignition Engine ◽  
Ion Current ◽  
Current Signal ◽  
Gas Plasma ◽  
Spark Plug ◽  
Engine Combustion ◽  
Analysis System

The spark plug ion current signal carries abundant information about the engine combustion process. Real-time acquisition of the spark plug ion current signal can effectively extract the characteristic parameters, then enhance the power, fuel economy and emissions of the engine. The paper analyzed the influence factors of ion current, designed an acquisition and analysis system of spark plug ion current signal, and mainly studied the influence of spark plug gap and bias voltage on ion current signal in a six-cylinder four-stroke gas engine. The results show that the bias voltage and the spark plug gap have a great impact on the spark plug ion current signal. The ion current signal intensity is directly proportional to the bias voltage applied cross the spark plug, and inversely proportional to the spark plug gap. Results also indicates that the ion current is directly proportional to the mobility and concentration of charged particles in burned gas plasma.

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