Wyniki wyszukiwania - BazTech

1

SI engine fuel mixture type indicator and an assessment of its suitability of an economic driving style

Wołczyński Zbigniew, Żak Mikołaj

Combustion Engines

|

2021

|

R. 60, nr 4

69--76

EN

The article presents the structure and a principle of operation of a simple indicator of the type of a fuel-air mixture supplying a spark-ignition engine with a direct fuel injection. The designed indicator was tested, as a result of which its correct operation was verified. By using information from the indicator, it was possible to assess its usefulness for assisting the driver in an economical driving style. Preliminary studies show that thanks to the use of the developed indicator, it is possible to save about 10% of fuel as a result of the correction of the economic driving style on the route selected for the purpose of this research paper. The target of this study was to confirm a noticeable reduction in fuel consumption when supplying the engine with a stratified mixture. In order to obtain more accurate data, the research should be extended to include a greater number of routes and its division into urban and non-urban areas.

2

Optical identification of the combustion of air-fuel mixture surrounded by non-combustible gas in a rapid compression machine

Cieślik W., Pielecha I., Wisłocki K.

Archivum Combustionis

|

2017

|

Vol. 37 nr 2

93--106

EN

The influence of non-combustible gas injection on combustion rates in an engine cylinder with centrally positioned ignition point has been discussed. The flame temperature distribution and its changes were taken into account in this research. The analysis of the influence of exhaust gas content in the cylinder on the combustion process has been based on the interpretation of high speed camera images for the period from the ignition start to full flame coverage of the combustion chamber. Authors performed a comparative analysis of the combustion process thermodynamic parameters based on the obtained characteristics. In order to demonstrate the charge stratification influence and the proportion of flue gas in the cylinder, a flame propagation analysis was performed through high frequency image sampling and using the flame temperature distribution in the combustion volume. The two-color method was used for determining this temperature. A flame temperature distribution example at selected combustion process stages was presented as well as for the entire combustion process. A significant reduction in the area covered by the flame was shown to be the result of an increase in the flue gas proportion in the cylinder. The flame area reduction was found to be 46% when using a 25% EGR share, while with an EGR contribution of 40%, the flame area was decreased by 78%. The flame covered area reduction was the result of "fencing" of the flame from the cylinder walls by an exhaust gas layer. According to changes in the flame area, the largest share of high temperatures, in the range 1800-2000 K, has also decreased from around 19% to 23%.

3

Theoretical analysis of air-fuel mixture formation in the combustion chambers of the gas engine with two-stage combustion system

Jamrozik A., Tutak W.

Bulletin of the Polish Academy of Sciences. Technical Sciences

|

2014

|

Vol. 62, nr 4

779--790

EN

The results of theoretical analysis of a mixture formation process during the compression stroke in a prechamber of the IC (internal combustion) gas engine with the stratified mixtures two-stage combustion system were presented in the paper. The course of excess air-fuel ratio changes in prechamber at ignition time λkz in function of degree of the mixture condensation during the compression stroke φ expressing quotient of a temporary cylinder and prechamber volume and maximal value of the volume were estimated. Research concerning λkz sensitivity on changes of rich combustible mixture composition delivered to the prechamber by the additional fuel supply system λko, mixture composition in cylinder _c and degree of filling a prechamber with the rich combustible mixture ξ were performed. According to numerical calculations it was proved that the real gas engine with the two stage combustion system at equal degree requires exact regulation of the three analysed values.

4

Badania samochodu napędzanego silnikiem FSI - systemem elektronicznego sterowania bezpośrednim wtryskiem benzyny

Typańska D., Putz Ł.

Prace Instytutu Elektrotechniki

|

2012

|

Z. 260

107-119

PL

W artykule zaprezentowano szczegółową analizę systemu bezpośredniego wtrysku benzyny FSI (Fuel Stratified Injection) stosowanego w samochodach koncernu Volkswagen Group. W pracy przedstawiono charakterystyczne elementy budowy z opisem ich wpływu na działanie tego typu silnika. Następnie przedstawiono wyniki badań mocy silnika, momentu obrotowego, emisji zanieczyszczeń oraz zużycia paliwa, przeprowadzonych na modelu VW Passat 2.0 FSI oraz porównano z wynikami badań odpowiednika o wtrysku pośrednim - VW Passat 2.0 MPI.

EN

In this article is presented a detailed analysis of FSI (Fuel stratified injection) gasoline direct injection system used in the Volkswagen Group cars. In the paper are also presented characteristic elements of the construction with a description of their impact on the operation such a type of engine. Next are presented results of research like engine power, torque, exhaust emissions and fuel consumption, carried out on the VW Passat 2.0 FSI and compared with test results in the indirect injection equivalent - VW Passat 2.0 MPI.

5

Identyfikacja właściwości silnika GDI i jego systemu sterowania

Wołczyński Z.

Silniki Spalinowe

|

2011

|

R. 50, nr 3

PL

Referat jest kontynuacją prezentacji badań własnych w ramach projektu badawczego MNiSW nr N N 504 340636 systemu sterowania silnikiem GDI. Przedstawia charakterystyki robocze i regulacyjne silnika (δ w , δ z , Tw), które są szczególnie ciekawe w obszarze pracy silnika na mieszankach uwarstwionych. W referacie przedstawiono także sposób fabrycznego sterowania wtryskiem paliwa ze względu na zastosowanie katalizatora zasobnikowego NOx i opis stanowiska badawczego silnika GDI zamontowanego fabrycznie w samochodzie Mitsubishi Carisma.

EN

The paper is a continuation of the presentation of research within the research project MNiSW No. N N 504 340636 on GDI engine control system. There are presented operating and regulatory characteristics of the engine (δ w , δ z , Tw), that are particularly interesting in the working area of stratified mixture. The paper presents also the way the original injection system controls due to the use of a NOx absorber and the description of the research stand of the GDI engine that is pre-installed in the Mitsubishi Carisma car.