A New Knock-Detection Method using Cylinder Pressure, Block Vibration and Sound Pressure Signals from a SI Engine

1998 ◽  
Author(s):  
Jong-Hwa Lee ◽  
Sung-Hwan Hwang ◽  
Jin-Soo Lim ◽  
Dong-Chan Jeon ◽  
Yong-Seok Cho
Keyword(s):  
Sound Pressure ◽  
Detection Method ◽  
Cylinder Pressure ◽  
Si Engine ◽  
Knock Detection

A Cylinder Pressure-Based Knock Detection Method for Pre-chamber Ignition Gasoline Engine

2021 ◽  
Vol 14 (3) ◽  
Author(s):  
Muhammed Fayaz Palakunnummal ◽  
Sahu Priyadarshi ◽  
Mark Ellis ◽  
Marouan Nazha
Keyword(s):  
Gasoline Engine ◽  
Detection Method ◽  
Cylinder Pressure ◽  
Knock Detection

Estimation of the Cylinder Pressure in a SI Engine Using the Variation of Crankshaft Speed

1994 ◽  
Author(s):  
Byeongjin Lim ◽  
Inkeon Lim ◽  
Jongbum Park ◽  
Youngjin Son ◽  
Eungseo Kim
Keyword(s):  
Cylinder Pressure ◽  
Si Engine

Evaluation of the combustion-induced noise and vibration using coherence and wavelet coherence estimates in a diesel engine

2019 ◽  
pp. 146808741987854
Author(s):  
Hossein Ahmadian ◽  
Gholamhassan Najafi ◽  
Barat Ghobadian ◽  
Seyed Reza Hassan-Beygi ◽  
Seyed Salar Hoseini
Keyword(s):  
Diesel Engine ◽  
Sound Pressure ◽  
Fuel Injection ◽  
Direct Injection ◽  
Wavelet Coherence ◽  
Injection Timing ◽  
Cylinder Pressure ◽  
Noise And Vibration ◽  
Four Levels ◽  
Wavelet Coherency

The understanding of noise generation and source identification is vital in noise control. This research was conducted to experimentally evaluate combustion-induced noise and vibration using coherence and wavelet coherence estimates. A single-cylinder direct-injection diesel engine was chosen for experimental investigation. The independent variables for conducting experiments were injection timing with five levels of 22, 27, 32 (normal), 37, and 42 crank angles before the top dead center, and also the engine torque load with four levels of 55%, 70%, 85%, and 100% of the rated value. The signals of cylinder pressure, liner acceleration, and radiated sound pressure of the test engine were measured and recorded. Then, coherency and wavelet coherency experiments were carried out between cylinder pressure and liner acceleration, cylinder pressure and sound pressure, and liner acceleration and sound pressure signals in MATLAB software. The results indicated that increasing load would increase wavelet coherency between cylinder pressure and liner acceleration signals at frequencies higher than 1 kHz. The coherent regions between cylinder pressure and sound pressure signals were mainly at frequencies higher than 1 kHz while advancing the fuel injection timing had shifted the coherency toward lower frequencies. In general, with advancing injection timing, the coherent regions between liner acceleration and sound pressure signals have appeared at broader time ranges, especially at frequencies between 100 and 500 Hz. Comparing the results of the wavelet coherency and coherency tests, we concluded that wavelet coherency is a more accurate and descriptive tool in evaluating the combustion-induced noise and vibration.

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