Spark Ignition Engine Knock Detection Using In-Cylinder Optical Probes

1996 ◽  
Author(s):  
Zhihong Sun ◽  
Perry L. Blackshear ◽  
David B. Kittelson
Keyword(s):  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Optical Probes ◽  
Engine Knock ◽  
Knock Detection

Reconstruction of Indicated Pressure Waveform in a Spark-Ignition Engine From Block Vibration Measurements

1997 ◽  
Vol 119 (4) ◽  
pp. 614-619 ◽  
Author(s):  
Piero Azzoni
Keyword(s):  
Combustion Engine ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Vibration Sensor ◽  
Pressure Waveform ◽  
Cylinder Pressure ◽  
Engine Operation ◽  
Knock Detection ◽  
Good Potential ◽  
On Line

Knowledge of the pressure waveform in each cylinder of a spark-ignition engine may provide useful diagnostic information concerning engine operation. This paper presents a method for the reconstruction of the indicated pressure waveform for each cylinder of a multicylinder internal combustion engine using engine block vibration signals. The method permits the reconstruction of the cylinder pressure waveform, cycle by cycle, during free accelerations. The procedure has good potential for application in end-of-assembly diagnostic tests, using a noncontacting laser velocimeter. The same signal processing method may be applicable on-board an automobile to perform an on-line cylinder-by-cylinder diagnostics, using the same vibration sensor used for knock detection in many production vehicles.

Modeling Investigation of Different Methods to Suppress Engine Knock on a Small Spark Ignition Engine

2015 ◽  
Vol 137 (6) ◽  
Author(s):  
Jiankun Shao ◽  
Christopher J. Rutland
Keyword(s):  
Octane Number ◽  
Direct Injection ◽  
Spark Ignition ◽  
Operating Conditions ◽  
Spark Ignition Engine ◽  
Simulation Code ◽  
Engine Knock ◽  
Combustion Simulation ◽  
3D Engine ◽  
Gas Recirculation

Knock is the main obstacle toward increasing the compression ratio and using lower octane number fuels. In this paper, a small two-valve aircraft spark ignition engine, Rotax-914, was used as an example to investigate different methods to suppress engine knock. It is generally known that if the octane number is increased and the combustion period is shortened, the occurrence of knock will be suppressed. Thus, in this paper, different methods were introduced for two effects, increasing ignition delay time in end-gas and increasing flame speed. In the context, KIVA-3V code, as an advanced 3D engine combustion simulation code, was used for engine simulations and chemical kinetics investigations were also conducted using chemkin. The results illustrated gas addition, such as hydrogen and natural gas addition, can be used to increase knock resistance of the Rotax-914 engine in some operating conditions. Replacing the traditional port injection method by direct injection strategy was another way investigated in this paper to suppress engine knock. Some traditional methods, such as adding exhaust gas recirculation (EGR) and increasing swirl ratio, also worked for this small spark ignition engine.

Analysis of Spark Ignition Engine Knock Signals using Fourier and Discrete Wavelet Transform

2009 ◽  
Author(s):  
Rodrigo Ceccatto Gerardin ◽  
Belisá rio Nina Huallpa ◽  
Marco Aurélio Faleiros Alves ◽  
José Roberto de França Arruda
Keyword(s):  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Discrete Wavelet ◽  
Engine Knock
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