scholarly journals Research on Experimental Method for Obtaining Independent Combustion Noise of Internal Combustion Engine

2018 ◽  
Vol 2018 ◽  
pp. 1-14
Author(s):  
Yang Xiang ◽  
Jiachi Yao ◽  
Qiang Zhou ◽  
Sichong Qian ◽  
Shuai Wang
Keyword(s):  
Transfer Function ◽  
Internal Combustion Engine ◽  
Test Bench ◽  
Noise Source ◽  
Combustion Engine ◽  
Load Condition ◽  
Internal Combustion ◽  
Combustion Noise ◽  
Transfer Function Method ◽  
Separation Test

Internal combustion engine noise sources are complex and changeable. Combustion noise is usually drowned out by mechanical noise and aerodynamic noise. Traditional noise source identification methods can only qualitatively identify combustion noise. In order to quantitatively obtain the independent pure combustion noise of an internal combustion engine, it is necessary to design and build a separate noise source simulation test bench. In this paper, the combustion noise separation test bench based on transfer function method is designed and implemented. In the test, a pressure pulse device is installed in the combustion chamber. When the piston is at top dead center (TDC), pulse pressure is generated to excite the internal combustion engine to radiate noise. The pressure signal and noise signal are utilized to obtain the transfer function of combustion pressure and noise. Then, according to the cylinder pressure and transfer function, the combustion noise can be directly calculated. The test was carried out on 4120SG diesel engine. Experimental results show that when the internal combustion engine is under 1500 rpm and no-load condition and 800 rpm and no-load condition, the frequency components of independent pure combustion noise are both mainly concentrated at 1100 Hz, 1400 Hz, and 3000 Hz. Furthermore, the internal combustion engine vibration test method and the combustion noise empirical formula calculation method are both carried out to show accuracy and effectiveness of the obtained independent combustion noise through the combustion noise separation test based on transfer function method.

scholarly journals Radiation Noise Separation of Internal Combustion Engine Based on Gammatone-RobustICA Method

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Jiachi Yao ◽  
Yang Xiang ◽  
Sichong Qian ◽  
Shuai Wang
Keyword(s):  
Internal Combustion Engine ◽  
Filter Bank ◽  
Noise Source ◽  
Combustion Engine ◽  
Near Field ◽  
Source Separation ◽  
Internal Combustion ◽  
Combustion Noise ◽  
Time Frequency ◽  
Separation Results

In the internal combustion engine noise source separation process, the combustion noise and the piston slap noise are found to be seriously aliased in time-frequency domain. It is difficult to accurately separate them. Therefore, the noise source separation method which is based on Gammatone filter bank and robust independent component analysis (RobustICA) is proposed. The 6-cylinder internal combustion engine vibration and noise test are carried out in a semianechoic chamber. The lead covering method is adopted to isolate the interference noise from numbers 1 to 5 cylinder parts, with only the number 6 cylinder parts left bare. Firstly, many mode components of the measured near-field radiated noise signals are extracted through the designed Gammatone filter bank. Then, the RobustICA algorithm is utilised to extract the independent components. Finally, the spectrum analysis, the continuous wavelet time-frequency analysis, the correlation function method, and the drag test are employed to further identify the separation results. The research results show that the frequency of the combustion noise and the piston slap noise are, respectively, concentrated at 4025 Hz and 1725 Hz. Compared with the EWT-RobustICA method, the separation results obtained by the Gammatone-RobustICA method have very fewer interference components.

Improved throttle valve modeling for spark-ignition engine simulations

2018 ◽  
Vol 233 (6) ◽  
pp. 1614-1622 ◽  
Author(s):  
Elie Haddad ◽  
David Chalet ◽  
Pascal Chesse
Keyword(s):  
Internal Combustion Engine ◽  
Discharge Coefficient ◽  
Test Bench ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Simulation Software ◽  
Spark Ignition Engine ◽  
Engine Test ◽  
Engine Simulation ◽  
Throttle Valve

Automotive manufacturers nowadays are constantly working on improving their internal combustion engines’ performance by reducing the fuel consumption and emissions, without compromising the power generated. Manufacturers are therefore relying on virtual engine models that can be run on simulation software in order to reduce the amount of time and costs needed, in comparison with experiments done on engine test benches. One important element of the intake system of an internal combustion engine is the throttle valve, which defines the amount of air reaching the plenum before being drawn into the cylinders. This article discusses a widely used model for the estimation of air flow rate through the throttle valve in an internal combustion engine simulation. Experiments have been conducted on an isolated throttle valve test bench in order to understand the influence of different factors on the model’s discharge coefficient. These experiments showed that the discharge coefficient varies with the pressure ratio across the throttle valve and with its angle. Furthermore, for each angle, this variation can be approximated with a linear model composed of two parameters: the slope and the Y-Intercept. These parameters are calibrated for different throttle valve angles. This calibration can be done using automotive manufacturers’ standard engine test fields that are often available. This model is then introduced into an engine simulation model, and the results are compared to the experimental data of a turbocharged engine test bench for validation. They are also compared with a standard discharge coefficient model that varies only with the throttle valve angle. The results show that the new model for the discharge coefficient reduces mass flow estimation errors and allows expanding the applications of the throttle valve isentropic nozzle model.

Modernization of the KI-1363-V stand for running-in and testing of internal combustion engines

2020 ◽  
Keyword(s):  
Internal Combustion Engine ◽  
Internal Combustion Engines ◽  
Test Bench ◽  
Combustion Engine ◽  
Educational Institution ◽  
Internal Combustion ◽  
Educational Process ◽  
Combustion Engines ◽  
Electronic Control ◽  
Wide Range

Today, stands for running in and testing internal combustion engines are actively used both at car service enterprises and in the educational process of specialized specialties of educational institutions. The article analyzes the stand KI-1363-V, installed on the basis of the department of technical service and repair of machines of the Federal State Budgetary Educational Institution of Higher Education of the Perm State Technical University, proposed and implemented measures for its modernization. In addition, a review of analogues on the market was carried out, as a result of which it was established that the purchase of a ready-made complex for testing internal combustion engines is economically unjustified. In the course of the work, a hardware and software complex (HSC) was developed and implemented, which allows automating the processes of taking performance characteristics from the engine under test and reducing the measurement error in order to increase the efficiency of using the test bench. In addition, the article describes the work carried out on the modernization of the test engine, implemented an engine management system with distributed fuel injection and electronic control. The electronic control unit for the engine and the stand and the specialized software "APK of the KI-1363-V stand" have been developed, which, in conjunction with the EFI Analytics TunerStudio software product, allows to implement a wide range of research and laboratory work related to tuning and characterizing the tested internal combustion engine... Keywords internal combustion engine, ICE test bench, ICE load characteristic, engine performance indicators

A Method of Performing the Supercharging Process at the Engines Researched on the Test Bench

2016 ◽  
Vol 822 ◽  
pp. 175-182
Author(s):  
Cristian Ioan Leahu ◽  
Anghel Chiru ◽  
Dan Mihai Dogariu
Keyword(s):  
Internal Combustion Engine ◽  
Test Bench ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Cutting Edge ◽  
Automatic Equipment

In this paper, we submit an advanced solution for the optimization of the supercharging process in the engines that are experimentally researched on the test bench. This solution may be applied only to the engines set on the test bench, whose energy, economic or ecological performances require an impetus by the optimization of the supercharging process. Cutting-edge automatic equipment for the achievement of the supercharging process should be used, with a view to studying and improving the behaviour of the experimentally researched engines, depending on the intensity of the supercharging process. In this way, the parameters to be fulfilled by the supercharging aggregate, which will equip the internal combustion engine, during its exploitation, will be known.

scholarly journals Library of Samples for E-Vehicle Propulsion Drive Tuning

2014 ◽  
Vol 5 (1) ◽  
pp. 27-33 ◽  
Author(s):  
Anton Rassõlkin ◽  
Liisa Liivik ◽  
Valery Vodovozov ◽  
Zoja Raud
Keyword(s):  
Internal Combustion Engine ◽  
Quality Evaluation ◽  
Test Bench ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Testing Equipment ◽  
Short Term ◽  
Electric Drives ◽  
Vehicle Propulsion

Abstract The majority of testing cycles for the vehicle comparison is the long-term cycles and could not be used for the short-term transient mode imitations. Also, all the used nowadays testing cycles were designed for internal combustion engine vehicles and take into account not only energy and mechanical aspects, but also pollution and internal combustion engine characteristics. The paper presents a collection of sample signals developed to explore and simulate multiple system impacts to emulate different reference and load conditions. The study describes the major driving modes, such as the constant-speed cruising, speeding up and braking, typical parking regimes, uphill and downhill motion, and taking a turn. The developed testing equipment and software are described. Responses of the battery vehicle drives to the changeable controls and disturbances were studied in the laboratory test bench. The set of test cycles prepared in the frame of the ABB control arrangement was applied to the system evaluation and assessment. The developed methodology can be recommended to adjust the electric drives for different kinds of testing equipment. Experimental validation of the described approach has demonstrated the broad possibilities for the steady-state and transient modes of vehicle quality evaluation. It suits for recommendations that can be made with regard to the tuning of the drive regulators, control looping, sensor allocation, and feedback arrangements.

Pyrometric Estimation of Exhaust Valve Temperature of an Internal Combustion Engine

2013 ◽  
Vol 136 (4) ◽  
Author(s):  
Luca Romani ◽  
Lorenzo Ferrari ◽  
Giovanni Ferrara ◽  
Ennio A. Carnevale
Keyword(s):  
Internal Combustion Engine ◽  
High Speed ◽  
Test Bench ◽  
Working Condition ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Exhaust Valve ◽  
Experimental Methodology ◽  
Accurate Design ◽  
Temperature Environment

The estimation of exhaust valve temperature of an internal combustion engine during its operation would be very useful for a more reliable and accurate design of valves and, more in general, of the whole valvetrain system. On the other hand, the direct temperature measurement of a valve is a big challenge because of its position inside the engine head, its high speed motion and the high temperature environment in which it works. To face this problem, an innovative experimental methodology is developed and shown in this paper. An experimental setup, based on the use of a pyrometer, is assembled and assessed thought several preliminary and on engine tests. The preliminary activity is focused on the estimation of the real emissivity of the exhaust valve surface and on the radiance attenuation due to the optical access and exhaust gasses interference. Once the measurement chain is assessed, several tests are carried out directly on an engine in working condition at the test bench. The tests allow to estimate the exhaust valve temperature in several stable engine working points as well as in transient conditions (load variation). In particular a first analysis of the correlations between valve temperature and some engine parameters like spark advance and air-to-fuel ratio is finally reported in this paper.

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