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

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

Knock Detection and Evaluation of Kerosene Piston Engine

2014 ◽  
Vol 568-570 ◽  
pp. 126-130 ◽  
Author(s):  
Pei Ze Zhang ◽  
Jian Guo Mao ◽  
Han Quan Wang ◽  
Xun Liang ◽  
Shi Feng Wang ◽  
...  
Keyword(s):  
Frequency Analysis ◽  
Gasoline Engine ◽  
Vibration Signal ◽  
Cylinder Block ◽  
Cylinder Pressure ◽  
Time Frequency ◽  
Pressure Signal ◽  
Energy Evaluation ◽  
Knock Detection ◽  
Engine Operating Condition

In this paper, knock detection and analysis methods of the gasoline engine are applied to a modified kerosene engine. Two kinds of signals, the cylinder pressure signal and the vibration signal, are acquired by a pressure sensor mounted in a spark plug and an accelerometer mounted on the cylinder block separately. Due to the influence of noise, such as cam shocks, piston up-and-down motion, crank rotation and so on, the vibration signal should be processed to extract knock feature. Firstly, FFT, a frequency analysis approach, is used to determine the characteristic frequency range of knock. Then, combining the sampling frequency, the vibration signal is divided into different frequency sub-bands, and the characteristic sub-band of DWT, a time-frequency analysis method, is determined. After that, DWT is applied to extract knock feature from the vibration signal. At last, the knock energy evaluation index is used to judge knock intensity. The reference knock energy is chosen by the researchers, and it is not absolutely suitable for the engine operating condition, so intuitive cylinder pressure signal is applied to supplement for knock judgment.

First Principle Based Control Oriented Gasoline Engine Model Including Lumped Cylinder Dynamics

2018 ◽  
Vol 140 (8) ◽  
Author(s):  
Ahmed Yar ◽  
A. I. Bhatti ◽  
Qadeer Ahmed
Keyword(s):  
Gasoline Engine ◽  
Angular Speed ◽  
Rigid Bodies ◽  
First Principle ◽  
Cylinder Pressure ◽  
Single Cylinder ◽  
Engine Model ◽  
Proposed Model ◽  
Engine Cylinder ◽  
Diagnostic Capabilities

A novel first principle based control oriented model of a gasoline engine is proposed which also carries diagnostic capabilities. Unlike existing control oriented models, the formulated model reflects dynamics of the faultless as well as faulty engine with high fidelity. In the proposed model, the torque production subsystem is obtained by integration of further two subsystems that is model of a single cylinder torque producing mechanism and an analytical gasoline engine cylinder pressure model. Model of a single cylinder torque producing mechanism is derived using constrained equation of motion (EOM) in Lagrangian mechanics. While cylinder pressure is evaluated using a closed form parametric analytical gasoline engine cylinder pressure model. Novel attributes of the proposed model include minimal usage of empirical relations and relatively wider region of model validity. Additionally, the model provides model based description of crankshaft angular speed fluctuations and tension in the rigid bodies. Capacity of the model to describe the system dynamics under fault conditions is elaborated with case study of an intermittent misfire condition. Model attains new capabilities based on the said novel attributes. The model is successfully validated against experimental data.

Research of NOx Emissions Characteristic of Engine Fuelled with M40

2011 ◽  
Vol 382 ◽  
pp. 22-25
Author(s):  
Xin Guang Li ◽  
Bing Yuan Han ◽  
Rong Hai Yang
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Simulation Model ◽  
Compression Ratio ◽  
Gasoline Engine ◽  
Volume Ratio ◽  
Nox Emissions ◽  
Cylinder Pressure ◽  
Variable Parameters ◽  
Vehicle Engine

A numerical simulation model for gasoline engine was established by GT-POWER in order to study the NOx emissions characteristic of vehicle engine fuelled with M40 (the methanol and the gasoline in volume ratio 40∶60) and was validated by Experimental data. Based on the model, the variable parameters study including air-fuel radio, compression radio and ignition advance angle were carried out. The model results showed that the compression radio and the air-fuel radio played an important role during the NOx emissions characteristic. There is a significant improvement of the NOx emissions with the compression ratio increases. The cylinder pressure increased with the improvement of the compression ratio brought out the NOx emissions rise. With the improvement of the air-fuel ratio, NOx emissions increased first and then decreased. A larger ignition advance angle can increase the pressure and the temperature of the cylinder.

Gasoline Engine Knock Analysis using Cylinder Pressure Data

1998 ◽  
Author(s):  
Michael F.J. Brunt ◽  
Christopher R. Pond ◽  
John Biundo
Keyword(s):  
Gasoline Engine ◽  
Cylinder Pressure ◽  
Pressure Data ◽  
Engine Knock

Effects of Different LPG Fuel Systems on Performances of Variable Compression Ratio Single Cylinder Engine

2002 ◽  
Author(s):  
G. H. Choi ◽  
J. H. Kim ◽  
Christian Homeyer
Keyword(s):  
Liquid Phase ◽  
Heat Release ◽  
Compression Ratio ◽  
Power Output ◽  
Alternative Fuels ◽  
Gasoline Engine ◽  
Cylinder Pressure ◽  
Maximum Heat ◽  
Spark Timing ◽  
Test Engine

Since the early 20th century, most ground vehicles are driven with gasoline and diesel. The degradation of the environment affects human on earth unless the quality of the air is improved. One of the alternative fuels, LPG, is potentially capable of lowering vehicular emissions when compared to gasoline or diesel. There is a penalty in power output resulting from the use of LPG because the engine can induce less amount of air with Mixer system comparing with gasoline engine. Currently, the liquid-phase LPG is injected into the intake port of the engine, the fuel vaporizes enroute to the combustion chamber. Therefore, the performance and combustion processes of the tested engine are investigated with different LPG fuel systems. The test engine was developed and named heavy-duty VACRE. The test engine for this work operates 1400rpm with MBT conditions. The major conclusions of the work include; 1) The power output of LPi system with liquid-phase is approximately 17% higher than that of vapor-phase Mixer system due to increases of volumetric efficiency. And the MBT spark timing of LPi system is approximately 25% more advanced than that of Mixer system at λ value 1.0; 2) The LPi system shows both the maximum heat release rate and the cumulative heat release to be approximately 20% higher than the Mixer system; 3) Maximum cylinder pressure decrease with increase of compression ratio and a point of maximum cylinder pressure is delayed with high compression ratio.

Experimental Evaluation of Piston Assembly Friction Under Motored and Fired Conditions in a Gasoline Engine

2004 ◽  
Author(s):  
Riaz A. Mufti ◽  
Martin Priest
Keyword(s):  
Gasoline Engine ◽  
Operating Conditions ◽  
Cylinder Pressure ◽  
Connecting Rod ◽  
Friction Modifier ◽  
Indicated Mean Effective Pressure ◽  
Axial Forces ◽  
The Difference ◽  
Digital Channels ◽  
Piston Assembly

Piston assembly friction measurement has been carried out on a single cylinder gasoline engine using the IMEP (indicated mean effective pressure) method at realistic engine speeds and loads without any major engine modifications. Instantaneous and mean piston assembly friction were measured under motored and fired conditions at different lubricant temperatures. The forces acting on the piston assembly were carefully determinated by measuring the cylinder pressure, crankshaft angular velocity and strain in the connecting rod. The difference between the resulting gas pressure, inertia and connecting rod axial forces acting on the piston yields the piston assembly friction. To achieve this with confidence, an advanced instrumentation, telemetry and data acquisition system was designed and developed, giving special attention to the synchronisation and simultaneous sampling of analogue and digital channels. Experiments are reported for piston assembly friction at a range of engine operating conditions with different lubricant formulations, with and without a friction modifier.

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