scholarly journals Impact of external interferences on vibroacoustic signals coming from combustion engine during cold test

2015 ◽  
Vol 160 (1) ◽  
pp. 26-35
Author(s):  
Zdzisław STELMASIAK ◽  
Mariusz RUDNICKI
Keyword(s):  
Combustion Engine ◽  
Piezoelectric Sensor ◽  
Cold Test ◽  
Spark Ignition ◽  
Measuring System ◽  
Cylinder Block ◽  
Spark Ignition Engines ◽  
Order Tracking ◽  
Compression Spring ◽  
Vibroacoustic Signals

In the paper is presented impact of external interferences on vibroacoustic signals coming from a spark ignition engine’s vibrations in cold test performed on engine assembly line. As the basis to the analysis were used signals of piezoelectric sensor mounted on cylinder block of the engine driven by electric motor. In course of the testing it has been used the order tracking analysis of the vibrations during the cold test, while experimental results were used to statistic analysis of significance of influence with use of the MiniTab computer program. The main objective of the investigations was to verify actually obtained vibroacoustic signals and to minimize interferences coming from the measuring system. It should contribute to reduction of tolerance limits and improved detection of faulty engines with use of vibroacoustic methods. The investigations have shown significant impact of contact surface of the cylinder block with the sensor and impact of deformations of compression spring on results of recorded vibroacoustic signal. Such impact should be taken into considerations in numerical analysis of the signal. It has been proposed to perform activities to reduce influence of the interferences on recorded signals. Results of the investigations have been already utilized in production cold tests of spark ignition engines.

Development of a Computer Controlled Valve System for an Internal Combustion Engine

2002 ◽  
Author(s):  
Paul Sullivan ◽  
Harry Petersen
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Computer Control ◽  
Internal Combustion ◽  
Spark Ignition ◽  
Spark Ignition Engines ◽  
State University ◽  
Senior Design ◽  
Operational Issues ◽  
Exhaust Valves

A newly emerging method of improving gas mileage and emissions from spark ignition engines is by computer control of the operation of the engine intake and exhaust valves. By controlling valve timing and duration the elimination of the throttle, a source of pumping loses can be minimized. One system is now in production by BMW, which uses a mechanism that varies the rocker arm ratio to vary the intake valve’s lift. As part of two Senior Design Projects a spark ignition internal combustion engine was modified at Minnesota State University, Mankato, to allow computer control of the engine’s valves. These projects worked at replacing the mechanically operated intake and exhaust valves with pneumatically operated valves controlled by computer in the form of a Programmable Logic Controller. The valves controlled by the solenoids switched compressed air to pneumatic cylinders that operate the existing poppet intake and exhaust valves on the engine. This paper will present the background, operational issues, and the initial results of the project.

scholarly journals Performance and Exhaust Emissions of a Spark Ignition Internal Combustion Engine Fed with Butanol–Glycerol Blend

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6473
Author(s):  
Stanislaw Szwaja ◽  
Michal Gruca ◽  
Michal Pyrc ◽  
Romualdas Juknelevičius
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Engine Performance ◽  
Internal Combustion ◽  
Exhaust Emissions ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Spark Ignition Engines ◽  
Exhaust Temperature ◽  
Indicated Mean Effective Pressure

Investigation of a new type of fuel for the internal combustion engine, which can be successfully used in both the power generation and the automotive industries, is presented in this article. The proposed fuel is a blend of 75% n-butanol and 25% glycerol. The engine tests conducted with this glycerol–butanol blend were focused on the performance, combustion thermodynamics, and exhaust emissions of a spark-ignition engine. A comparative analysis was performed to find potential similarities and differences in the engine fueled with gasoline 95 and the proposed glycerol–butanol blend. As measured, CO exhaust emissions increased, NOx emissions decreased, and UHC emissions were unchanged for the glycerol–butanol blend when compared to the test with sole gasoline. As regards the engine performance and combustion progress, no significant differences were observed. Exhaust temperature remarkably decreased by 3.4%, which contributed to an increase in the indicated mean effective pressure by approximately 4% compared to gasoline 95. To summarize, the proposed glycerol–butanol blend can be directly used as a replacement for gasoline in internal combustion spark-ignition engines.

Numerical Analysis of a Torch-Ignition System for an Internal Combustion Engine

2015 ◽  
Vol 798 ◽  
pp. 234-238
Author(s):  
Fábio Radicchi ◽  
Raphael M. Braga ◽  
Raniro A. Coelho ◽  
Roberto B.R. Costa ◽  
Ramon Molina Valle
Keyword(s):  
Fluid Flow ◽  
Numerical Analysis ◽  
3D Model ◽  
Combustion Engine ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Spark Ignition Engines ◽  
Flow Investigation ◽  
Pollutants Emission ◽  
Turbulence Parameters

Torch ignition systems in spark-ignition engines represents an interesting option in the efforts to reduce pollutants emission and specific fuel consumption. Based on this idea, this paper presents a 3D model of a prechamber created for a spark-ignition engine and focuses on the numerical analysis of the fluid flow inside the modified chamber. This kind of analysis is very important once it allowed evaluating aspects like turbulence parameters, pressure inside the chamber and prechamber, fluid recirculation and a possible prechamber’s geometry for the engine. The studies were done in a four valve Single Cylinder Research Engine – SCRE. For the numerical modeling and fluid flow investigation was used STAR-CD software. Results show higher values of tumble ratio and kinetic energy with the prechamber.

scholarly journals The Importance of Thermal Barrier Coating in Compression and Spark Ignition Engines

2020 ◽  
Vol 9 (4) ◽  
pp. 1738-1742
Keyword(s):  
Thermal Barrier Coating ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Renewable Energy Sources ◽  
Internal Combustion ◽  
Spark Ignition ◽  
Thermal Barrier ◽  
Combustion Engines ◽  
Spark Ignition Engines ◽  
Barrier Coating

This paper explains the importance of applying thermal barrier coating (TBC) technique in internal combustion engines by providing an effective way of reducing gas emission which are carbon monoxide (CO), oxide of nitrogen (NOX), hydrocarbon (HC) including particulate matter (PM) thereby increasing engine performance (brake thermal efficiency) achieved by applying coating layers on some internal combustion engine parts using materials with low thermal conductivities and matched coefficients of thermal expansion (CTE close to the substrate material) which are mainly ceramics. Energy demand for various activities of life is increasing on a daily basis. The world depends majorly on non-renewable energy sources from fossil fuels to meet these energy demands. To be comfortable in life, better means of transportation and provision of power are required. Compression and spark ignition engines which are also called Internal Combustion Engines (ICEs) provide better transport facilities and power. However, combusting these fuels in automobile and stationary engines produces unfriendly atmosphere, contaminates water and air that are consumed by man. Pollution created as a result of combustion of gases in ICE is one of the worst man made contribution to atmospheric pollution.

scholarly journals Comparative analysis of the fluid dynamic efficiency of standard and alternative intake strategies for multivalve spark-ignition engines

2013 ◽  
Vol 2 (2) ◽  
pp. 140 ◽  
Author(s):  
Angelo Algieri
Keyword(s):  
Combustion Engine ◽  
Fluid Dynamic ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Valve Lift ◽  
Spark Ignition Engines ◽  
Dynamic Efficiency ◽  
Noticeable Effect ◽  
Dynamic Performances ◽  
Experimental Characterisation

The work aims at investigating the fluid dynamic performances of a multivalve spark-ignition engine and at evaluating the influence of the throttling process on the engine permeability. To this purpose, a production four-stroke internal combustion engine is analysed during the intake phase. The experimental characterisation is carried out at the steady flow rig in terms of dimensionless discharge and flow coefficients. The global investigation illustrates the noticeable effect of the valve lift on the engine head breathability. Furthermore, the experimental analysis demonstrates that the throttling process has a significant influence on the volumetric efficiency of the intake system and this effect increases with the valve lift. Finally, alternative strategies are studied in order to improve the engine fluid dynamic efficiency at partial loads. Specifically, the research shows that inlet valve deactivation and the adoption of asymmetric intake valve lifts assure an increase in head permeability.

scholarly journals Detectability of gear damage in combustion engines through a vibroacoustic method

2014 ◽  
Vol 158 (3) ◽  
pp. 12-22
Author(s):  
Zdzisław STELMASIAK ◽  
Mariusz RUDNICKI
Keyword(s):  
Vibration Amplitude ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Cold Test ◽  
Combustion Engines ◽  
Gear Teeth ◽  
Order Analysis ◽  
Vibroacoustic Diagnostics ◽  
Harmonic Components ◽  
Vibroacoustic Signals

The paper presents a new methodology in vibroacoustic diagnostics of internal combustion engines during a cold test on the production line. This method utilizes order analysis of harmonic components of vibroacoustic signals taken from a combustion engine driven with an electric motor to identify the source of noise and vibration amplitude. The presented analysis of the harmonic orders was used to diagnose the damage of the gear teeth.

scholarly journals Performance and Emissions of a Premixed Combustion Engine Fueled by Methanol–Gasoline Blends

2020 ◽  
Author(s):  
Jibai Wang ◽  
Peng Zhang ◽  
Chunhua Zhang ◽  
Zheng Jing
Keyword(s):  
Internal Combustion Engines ◽  
Volume Fraction ◽  
Combustion Engine ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Combustion Engines ◽  
Spark Ignition Engines ◽  
Promising Alternative ◽  
Soot Precursors ◽  
Performance And Emissions

Abstract Background: Methanol is abundant, safe, and environmentally friendly and has physicochemical properties similar to those of gasoline. It is a promising alternative fuel in China because it can be directly used in both spark- and compression-ignition internal combustion engines. The current development of spark-ignition engines focuses on the reduction of the fuel volume and increase in the compression ratio (CR), which would benefit the engine’s thermal efficiency. However, increasing the CR may deteriorate particulate matter (PM) due to the high temperature.Methods: Herein, an experimental study was conducted on methanol–gasoline blends in a spark-ignition engine. We examined the performance and formaldehyde emissions of methanol–gasoline blends by using three volume fractions (M0, M15, and M100). In addition, the effects of the CR on PM emissions were investigated.Results: The following relationships were observed: (1) When methanol was blended with gasoline, the formaldehyde emissions increased significantly. The formaldehyde emissions of 100% methanol were higher than those of the methanol–gasoline blend with a methanol volume fraction of 15%; both of these emissions were higher than those of pure gasoline; (2) Increasing the CR resulted in increased PM emissions; (3) For a given blending ratio, the PM emissions were positively correlated with the CR; and (4) The PM emissions were negatively correlated with the methanol volume fraction.Conclusions: Methanol reduces the heat loss at the wall surface. As the ratio of methanol in gasoline increases, the PM emissions decrease. On the other hand, the PM emissions are positively correlated with the CR. The addition of lower alcohols dilutes the concentrations of soot precursors, thereby reducing the soot emissions.

scholarly journals Knock Detection in Spark Ignition Engines Base on Complementary Ensemble Empirical Mode Decomposition-Hilbert Transform

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
Fengrong Bi ◽  
Teng Ma ◽  
Jian Zhang ◽  
Lin Li ◽  
Chunfang Shi
Keyword(s):  
Hilbert Transform ◽  
Spark Ignition ◽  
Ensemble Empirical Mode Decomposition ◽  
Cylinder Block ◽  
Spark Ignition Engines ◽  
Cylinder Pressure ◽  
Vibration Signals ◽  
Mode Decomposition ◽  
Engine Cylinder ◽  
Knock Detection

In spark ignition engines, knock onset limits the maximum spark advance. An inaccurate identification of this limit penalises the fuel conversion efficiency. Thus knock feature extraction is the key of closed-loop control of ignition in spark ignition engine. This paper reports an investigation of knock detection in spark ignition (SI) engines using CEEMD-Hilbert transform based on the engine cylinder pressure signals and engine cylinder block vibration signals. Complementary Ensemble Empirical Mode Decomposition (CEEMD) was used to decompose the signal and detect knock characteristic. Hilbert transform was used to analyze the frequency information of knock characteristic. The result shows that, for both of cylinder pressure signals and vibration signals, the CEEMD algorithm could extract the knock characteristic, and the Hilbert transform result shows that the energy of knock impact areas has the phenomenon of frequency concentration in both cylinder pressure signal and cylinder block vibration signal. At last, the knock window is then determined, based on which a new knock intensity evaluation factorKis propose, and it can accurately distinguish between heavy knock, light knock, and normal combustion three states.

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