Comparison of Cylinder Pressure Based Knock Detection Methods

1997 ◽  
Author(s):  
Klaas Burgdorf ◽  
Ingemar Denbratt
Keyword(s):  
Detection Methods ◽  
Cylinder Pressure ◽  
Knock Detection

scholarly journals Multivariate Knock Detection for Development and Production Applications

2004 ◽  
Author(s):  
Todd E. Tousignant ◽  
Graham T. Reader ◽  
Jimi Tjong
Keyword(s):  
Internal Combustion Engines ◽  
Mechanical Vibration ◽  
Acoustic Resonance ◽  
Detection Methods ◽  
Limiting Factor ◽  
Laboratory Environment ◽  
Performance Improvements ◽  
Knock Detection ◽  
Combustion Knock ◽  
Engine Development

Combustion knock caused by end gas autoignition continues to be a limiting factor in the performance of automotive internal combustion engines. As such, the availability of efficient knock detection methods is a prime requirement for the optimization of engine mapping and control. Current production knock control systems are based on the measurement of mechanical vibration induced by the acoustic resonance excited in the combustion chamber during autoignition. These vibrations are measured using accelerometers on the engine block. Conversely, knock detection in the laboratory environment during engine development or calibration generally involves either acoustic methods or acquisition of in-cylinder pressure. The purpose of this study is to develop an improved multi-transducer vibration-based knock detection method with applications in engine development and production. The possibility of replacing the pressure-based detection methods in the laboratory environment presents many advantages relating to cost and efficiency. Moreover, the economy of a vibration-based system coupled with improved correlation to laboratory methods represents great potential for performance improvements if applied to production applications.

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

KNOCK Detection with Series Cylinder Pressure Sensors

2020 ◽  
Author(s):  
Simon Haertl ◽  
Josef Kainz ◽  
Harry Schuele ◽  
Johannes Beer ◽  
Matthias Gaderer
Keyword(s):  
Pressure Sensors ◽  
Cylinder Pressure ◽  
Knock Detection

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

Normalized Knock Intensity Determination Based on the Knock Sensor Analysis to Have a Fixed Detection Threshold at Different Operating Conditions

2015 ◽  
Vol 138 (6) ◽  
Author(s):  
Mohammad Momeni Movahed ◽  
Hassan Basirat Tabrizi ◽  
Seyed Mostafa Agha Mirsalim
Keyword(s):  
Detection Threshold ◽  
Operating Conditions ◽  
Cylinder Pressure ◽  
In Series ◽  
Knock Detection ◽  
Sensor Analysis ◽  
Intensity Calculation ◽  
Knock Sensor ◽  
Novel Model ◽  
Pressure Analysis

Processing the knock sensor's signal is the most common approach for knock detection in series production vehicles. Filtration, rectification, and integration in a defined knock window (KW) are main steps to compute the standard knock intensity (SKI). The SKI strongly depends on the engine operating conditions. In this study, a novel model is proposed based on the knock sensor analysis to determine the normalized knock intensity (NKI) with much less dependency on the operating conditions, cylinder numbers (CNs), and KW. Implementing the proposed normalization model, a fixed detection threshold can be used for knock detection at all operating conditions. To verify the model, an accurate knock detection method based on cylinder pressure analysis is utilized, which comprises intensity calculation and a novel technique for detection threshold determination. Experimental results at all operating conditions show a square of correlation coefficient greater than 0.7 when the knock intensity from the presented model is compared with the reference cylinder pressure based method. In addition, the model detects all heavy knocking cycles and there is no wrongly detected knocking combustion.

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.

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