scholarly journals The analysis of an unrepeatability of cylinder pressure signal in internal combustion engines

2005 ◽  
Vol 120 (1) ◽  
pp. 31-39
Author(s):  
Zdzisław CHŁOPEK ◽  
Piotr STASIAK
Keyword(s):  
Normal Distribution ◽  
Internal Combustion Engines ◽  
Engine Speed ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Cylinder Pressure ◽  
Static Properties ◽  
Pressure Signal ◽  
Wide Range ◽  
Static Conditions

In this paper an analysis of irrepeatability of cylinder pressure signal in static conditions of engine work was performed. Large irregularity of analysed signal was stated that follows the irregularity of engine speed and pressure value distortions in each quasi–period. A stationarity of cylinder pressure was studied. Resampling data method in the revolution angle domain was suggested. Due to this synchronised averaging, transformed signal was an effective method of eliminating distortions in the basic periodical signal. Static properties of signal deviations (deviations of cylinder pressure from pressure averaged in quasi–periods) were studied. It was stated that the analysed distortions are a wide–range noise and there is no reason to formulate a hypothesis regarding the analysed signal conformity with a normal distribution.

On-Board Fuel Property Identification Method Based on High-Pressure Common Rail Pressure Signal

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
Junfeng Zhao ◽  
Junmin Wang
Keyword(s):  
High Pressure ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Common Rail ◽  
Combustion Engines ◽  
Rail Pressure ◽  
Fuel Property ◽  
Pressure Signal ◽  
Common Rail Pressure ◽  
Property Identification

This paper investigates the impact of fuel property variations on the common rail pressure fluctuation in high-pressure common rail (HPCR) system and explores the possibility of identifying the fuel types based on the measurement of rail pressure for internal combustion engines. Fluid transients, particularly the water hammer effect in a HPCR system, are discussed and the 1D governing equations are given. A typical HPCR system model is developed in GT-Suite with the injectors, three-plunger high-pressure pump, and pressure control valve being modeled in a relatively high level of detail. Four different fuels including gasoline, ethanol, diesel, and biodiesel are modeled and their properties including density, bulk modulus, and acoustic wave speed are validated against data in the literature. Simulation results are obtained under different conditions with variable rail pressures and engine speeds. To reduce the excessive rail pressure oscillation caused by multiple injections, only four main-injections are enabled in each engine revolution. The results show that the natural frequency of a common rail varies with the type of fuel filled in it. By applying the fast Fourier transform (FFT) to the pressure signal, the differences of fuel properties can be revealed in the frequency domain. The experiment validation is conducted on a medium-duty diesel engine, which is equipped with a typical HPCR system and piezo-electric injectors. Tests results are given for both pure No. 2 diesel and pure soybean biodiesel at different rail pressure levels and different engine speeds. This approach is proved to be potentially useful for fuel property identification of gasoline-ethanol or diesel-biodiesel blends on internal combustion engines.

scholarly journals Development and Validation of a Reduced DME Mechanism Applicable to Various Combustion Modes in Internal Combustion Engines

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Gregory T. Chin ◽  
J.-Y. Chen ◽  
Vi H. Rapp ◽  
R. W. Dibble
Keyword(s):  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Detailed Mechanism ◽  
Reduced Mechanism ◽  
Hcci Combustion ◽  
Combustion Modes ◽  
Reduced Chemistry ◽  
Wide Range ◽  
Development And Validation

A 28-species reduced chemistry mechanism for Dimethyl Ether (DME) combustion is developed on the basis of a recent detailed mechanism by Zhao et al. (2008). The construction of reduced chemistry was carried out with automatic algorithms incorporating newly developed strategies. The performance of the reduced mechanism is assessed over a wide range of combustion conditions anticipated to occur in future advanced piston internal combustion engines, such as HCCI, SAHCCI, and PCCI. Overall, the reduced chemistry gives results in good agreement with those from the detailed mechanism for all the combustion modes tested. While the detailed mechanism by Zhao et al. (2008) shows reasonable agreement with the shock tube autoignition delay data, the detailed mechanism requires further improvement in order to better predict HCCI combustion under engine conditions.

scholarly journals Renewable Pulverized Biomass Fuel for Internal Combustion Engines

Processes ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 465
Author(s):  
Ashraf Elfasakhany ◽  
Mishal Alsehli ◽  
Bahaa Saleh ◽  
Ayman A. Aly ◽  
Mohamed Bassuoni
Keyword(s):  
Rate Constants ◽  
Internal Combustion Engines ◽  
Renewable Energy Sources ◽  
Internal Combustion ◽  
Solid Particles ◽  
Combustion Engines ◽  
Modeling Tools ◽  
Wide Range ◽  
New Phenomena ◽  
Powder Combustion

Biomass is currently one of the world’s major renewable energy sources. Biomass in a powder form has been recently proposed as the most encouraging of biomass contours, especially because it burns like a gas. In the current study, biomass powder was examined, for the first time, as a direct solid fuel in internal combustion engines. The aim of the current study was to investigate modeling tools for simulation of biomass powder in combustion engines (CE). The biomass powder applied was in a micro-scale size with a typical irregular shape; the powder length was in the range of 75−5800 μm, and the diameter was in the range 30−1380 μm. Different mechanisms for biomass powder drying and devolatilization/gasification were proposed, including different schemes’ and mechanisms’ rate constants. A comparison between the proposed models and experiments was carried out and results showed good matching. Nevertheless, it is important that a biomass powder simulation addresses overlapping/complicated sub-process. During biomass powder combustion, tar was shown to be formed at a rate of 57 wt.%, and, accordingly, the formation and thermal decomposition of tar were modelled in the study, with the results demonstrating that the tar was formed and then disintegrated at temperatures between 700 and 1050 K. Through biomass powder combustion, moisture, tar, and gases were released, mostly from one lateral of particles, which caused ejection of the solid particles. These new phenomena were investigated experimentally and modeled as well. Results also showed that all the proposed models, along with their rate constants, activation energies, and other models’ parameters, were capable of reproducing the mass yields of gases, tar, and char at a wide range of working temperatures. The results showed that the gasification/devolatilization model 3 is somewhat simple and economical in the simulation/computation scheme, however, models 1 and 2 are rather computationally heavy and complicated.

STAND FOR RUNNING AND TESTING OF LOW POWER MOBILE FARM MACHINERY ENGINES

2016 ◽  
Vol 1 (2) ◽  
pp. 51-53 ◽  
Author(s):  
Иншаков ◽  
Aleksandr Inshakov ◽  
Байков ◽  
Dmitriy Baykov ◽  
Десяев ◽  
...  
Keyword(s):  
Low Power ◽  
Internal Combustion Engine ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Internal Combustion ◽  
High Energy ◽  
Combustion Engines ◽  
Farm Machinery ◽  
Three Phase ◽  
Wide Range

The purpose of research is to improve the quality of production and repair internal low-power mobile farm combustion engines. To achieve this goal it was suggested to carry out running and testing the engines of small tools and equipment in specialized economical braking stands. The design of such stand, consisting of internal combustion engine, connected crank shaft with asynchronous electric machine with wound rotor, connected to the three-phase network, and matrix converter frequency included in the three-phase electrical network and consisting of nine bidirectional transistor switches, which receive signals space-vector control with automatic control system connected with the test equipment on the basis of a personal computer on which the signals from the sensors mounted on the internal combustion engine is also coming. This stand design for running and testing of internal combustion engines of mobile low power farm machinery is technically easy to manufacture and cost-effective to use. In addition, the design feature of the proposed technical solution is characterized by high energy efficiency and reliability, small dimensions and weight parameters, and wide range of speed control asynchronous machine with wound rotor.

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

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