Wyniki wyszukiwania - BazTech

1

Reduction of CO2 emission as a result of the use of 48-volt electrical installationsin passenger cars

Kozyra Jacek, Łukasik Zbigniew, Kuśmińska-Fijałkowska Aldona, Janota Aleš

Archives of Transport

|

2023

|

Vol. 66, iss. 2

7--20

EN

The introduction of a new standard of 48-volt electrical systems in cars comes at an additional cost to the vehicle. Acceptance of these costs is justified because it becomes a way to achieve lower CO2 emissions and lower fuel consumption. An important factor in favor of adopting 48-volt systems is the reduction in CO2 due to the use of a highly efficient 48-volt motor-generator unit coupled to a DC/DC converter. A methodology for testing new solutions to quantify CO2 savings and reductions therefore becomes crucial. This methodology must be capable of demonstrating the CO2 benefits primarily of the innovative technology proven in real-world driving conditions and with a large amount of realistic statistical data. The introduction of new eco-innovations must take into account the linkage and impact on other environmentally oriented ecoinnovative solutions. When implementing new technical solutions, a necessary aspect is the interaction with other innovations installed in vehicles with new electrical installation standards. Therefore, for the expected synergy of solutions to occur, two or more innovative technologies must be installed. Then the combined savings from one of them will affect the performance of the other technologies, and vice versa. The new technology of a high-efficiency 48-volt motor-generator unit cooperating with a 48V/12V DC/DC converter fits very well in creating interactions with other implemented solutions aimed at reducing CO2 emissions. The article discusses the problems of the introduced new technology of a high-efficiency 48-volt motor-generator unit cooperating with a 48V/12V DC/DC converter. The publication analyzes the impact of in creasing the voltage rating of current passenger car installations to 48V. Based on the methodology for determining the reduction of CO2 emissions of a vehicle with a 48V/12V DC/DC voltage converter installed, the mass of fuel per unit of engine operation time was determined. The amount of fuel saved was determined, and CO2 emission reductions were calculated for the three adopted passenger vehicles tested.

2

Measurement of delay using travel time reliability statistics in an urban outer corridor

Reddy Kanala Teja Vinay Kumar, Challagulla Surya Prakash

Zeszyty Naukowe. Transport / Politechnika Śląska

|

2022

|

z. 114

143--154

EN

Unexpected delay on freeways is the prime cause of dissatisfaction in road users. Increasing traffic, adverse environmental conditions, accidents, time, season, location and many more factors influence travel time and cause delay. There is no direct method to estimate delay. It is calculated from trip time estimates. Thus, it is a very big challenge for transportation professionals to develop a model that accurately estimates the trip time for a trip at a particular time, by a specific mode of transport. Subsequently, the reliability of the delay calculated from those trip time estimates is often doubtful. Further, the measurement of delay using the trip time data is another big thing. This paper is a step toward measuring the delay in an accurate way using travel time reliability measures. The study was conducted on the two modes of public transportation (City bus and Auto) in an urban corridor of length 16.3 km, in Hyderabad city, India. In this study, a license plate survey was conducted for data collection, travel time-based statistical analysis was employed for estimation of trip time and by making use of travel time measures, the delay was measured. The approach was validated graphically to portray its accuracy.

3

Prediction of vehicle ownership growth using Gompertz model, case study of Hungary

Torok Adam

System Safety : Human - Technical Facility - Environment

|

2022

|

Vol. 4, nr 1

164-169

EN

Autonomous Vehicles (AVs) are expected to introduce numerous benefits for future mobility. These potential benefits and many others vary substantially by the market share of AVs. Therefore, this research empirically estimates, using the Gompertz function, the projected growth rates of passenger vehicles in Hungary using historical patterns of human-driven vehicle ownership data based on projected per capita GDP. This study’s contribution to the literature is through a mathematical approach that predicts passenger cars market penetration rate, in which the assumptions and the used parameters of the model can be easily modified based on different case studies, or they can be updated due to the advancement in technology and progress in knowledge of the studied market.

4

Evaluation of ecological extremes of vehicles in road emission tests

Pielecha Jacek, Skobiej Kinga

Archives of Transport

|

2020

|

Vol. 56, iss. 4

33--46

EN

New testing procedures for determining road emissions of exhaust pollutants for passenger vehicles were established in 2018. New road testing procedures are designed to determine actual exhaust emissions, which may not always reflect laboratory emissions. Test procedures for the emission of pollutants in real traffic conditions are divided into four stages. The latest research on the emission of pollutants from motor vehicles in road traffic conditions, carried out using mobile measuring systems, reflects the actual ecological state of vehicles. The article compares the results of exhaust emissions obtained in road tests using the latest legislative proposals for passenger cars. Then, an attempt was made to determine the engine operating parameters in which exhaust road emission would be the lowest. Solution scenarios were defined as part of permissible changes to dynamic parameters that are included in European legislation on RDE testing. For this purpose, an optimization tool was used, allowing on the basis of given input data to determine the minimum objective function, defined as the smallest emission value of individual harmful compounds. The results of the exhaust gas emissions in the RDE test were used to determine the road emissions of individual harmful compounds. A thorough analysis of the emission intensity of individual compounds has shown that it is possible to approximate such values using functional rela-tionships or adopting them as a constant value. This division was used to determine the extremes (in this case the minima) of the objective function (minimum road emissions of harmful exhaust components). This task resulted in obtaining (within the permissible tolerances of all driving parameters and durations of individual road test sections) the value of exhaust emissions in the range from 26% to 81% lower than in the actual road test. This means that there is a tolerance range, where you can obtain the value of emissions in road tests. As a result, you can use the process of determining the minimum emissions tests RDE calibration of the drive units already at the stage of preparation so that in the real traffic conditions characterized by the lowest exhaust emissions.

5

The impact of RDE test dynamic parameters on the obtained exhaust emission results

Kurtyka Karolina, Pielecha Jacek

Zeszyty Naukowe Instytutu Pojazdów / Politechnika Warszawska

|

2019

|

z. 1/119

15--24

EN

The article presents and discusses the research results on the impact of RDE test dynamic parameters on the emission of selected exhaust components. The measurements were carried out in compliance with the latest legislative procedures applicable to passenger cars. Five passenger cars with similar curb weight were selected for the tests inreal traffic conditions. All tests were performed on the same research route, which includes urban, rural and motorway conditions. The obtained results were analyzed of RDE procedure’s requirements and the Euro 6c toxicity standard. Then the values of dynamic parameters of all tests were compared (relative positive acceleration and 95th percentile of V·a+) and their effect on the obtained emission results was determined. As a summary, the correlations between the on-road exhaust emission and dynamic parameters were defined.

PL

W artykule przedstawiono i omówiono wyniki badań wpływu parametrów dynamicznych testu RDE na emisję wybranych składników spalin. Badania przeprowadzono zgodnie z najnowszymi procedurami legislacyjnymi odnoszącymi się do samochodów osobowych. Do przejazdów w rzeczywistych warunkach ruchu drogowego wybrano 5 samochodów osobowych, które charakteryzowały się zbliżoną masą własną. Otrzymane wyniki przeanalizowano pod kątem ich zgodności z wymogami procedury RDE oraz normy toksyczności Euro 6. Następnie porównano wartości warunków dynamicznych wszystkich przejazdów (względnego przyspieszenia dodatniego i 95-procentowego centyla iloczynu prędkości i dodatniego przyspieszenia) oraz określono ich wpływ na uzyskiwane wyniki emisji spalin. Jako podsumowanie uzyskanych porównań wyznaczono korelacje między warunkami dynamicznymi i emisją wybranych składników spalin.

6

Experts forecasts on the demand for energy carriers in motor vehicle transport in Poland up to year 2035

Gis Wojciech, Waśkiewicz Jerzy, Menes Maciej

Combustion Engines

|

2019

|

R. 58, nr 3

162--165

EN

Presentation of the number of passenger cars, vehicles other than passenger cars with GVM up to 3.5 tons and above 3.5 tons (trucks, buses and special vehicles), registered in Poland as at the end of 2015, with types of energy carriers. Forecasts of transport performance of the vehicle fleet and the forecast of the fleet volume in Poland by year 2035. Expert forecasts of energy carriers consumption (petrol, diesel oil, LPG, CNG, electric power, hydrogen) up to year 2035.

7

Determining the route for the purpose light vehicles testing in Real Driving Emissions (RDE) test

Gis Wojciech, Pielecha Jacek, Merkisz Jerzy, Kruczyński Stanisław, Gis Maciej

Combustion Engines

|

2019

|

R. 58, nr 3

61--66

EN

In the regulations concerning approval of light vehicles starting from September 2019 it will be necessary to conduct exhaust emissions tests both on a chassis dynamometer and for real driving emissions. It is a legislative requirement set forth in EU regulations for the purpose of the RDE (Real Driving Emissions) procedure. To decide on the RDE route for the purpose of the LV exhaust emissions tests many requirements must be fulfilled, regarding for example external temperature and the topographic height of the tests, driving style (driving dynamic parameters), trip duration, length of respective test sections (urban, rural, motorway, etc.). The works on outlining RDE routes are continued across the country in various research centres. Specifying the RDE route for test purposes, i.e. works in which the authors of this article are actively involved, has become a major challenge for future approval surveys concerning the assessment of hazardous emissions from light vehicles and for development studies focusing on - for example - the consumption of energy in electric and hybrid vehicles. The test route has been chosen to ensure that the test is performed on a continual basis. Data were recorded on a constant basis with the minimum duration of the test achieved. The test involved light vehicles and PEMS device for measuring the exhaust emissions, vehicle’s speed, completed route, etc. The device was installed in such manner as to ensure that its impact on the exhaust emissions from the tested vehicle and on the device’s operation is the least. The vehicle load was consistent with the requirements of the standard and included the aforesaid measurement device, the driver and the operator of PEMS. The tests were carried out on working days. The streets and roads used for the tests were hard-surfaced. Measurements were performed in accordance with the requirements of RDE packages (Package 1-4), i.e. taking into account - among others - the engine cold start. The article discusses the method of outlining the test route fulfilling the specific requirements for RDE testing. Chosen results of exhaust emissions from a passenger car with a spark-ignition engine along the defined RDE test route have been provided. The tests discussed in the article are introductory in the area of RDE tests and provide an introduction into further studies of exhaust emissions and energy consumption in real driving conditions in conventional vehicles and vehicles with alternative engines, e.g. hybrid and electric vehicles.

8

Cold start emissions of passenger cars with gasoline and diesel engines in Real Driving Emissions tests

Pielecha Jacek, Merkisz Jerzy, Kurtyka Karolina, Skobiej Kinga

Combustion Engines

|

2019

|

R. 58, nr 4

160--168

EN

Modernization of passenger cars and constant development of existing legislation lead to a reduction of exhaust emissions from these vehicles. In accordance with package 3 of the RDE test procedure, the European Commission has extended testing methods by including exhaust emissions during a cold start. The article compares the research results on the impact of ambient temperature during the cold start of spark-ignition and compression-ignition engines in road emission tests. The tests were carried out in line with the requirements of the RDE test procedure for passenger cars meeting the Euro 6d-Temp emissions standard. The obtained results were analyzed, i.e. there were compared the engine and vehicle operation parameters and the values of road exhaust emissions, during the cold start of gasoline and diesel engines at the ambient temperature of approximately 25°C. The summary presents the share of cold start phase of a passenger car (at the ambient temperature of around 25°C) for each exhaust emission compound in the urban part of the test, and in the entire RDE test, depending on the engine type used.

9

Rynek dystrybucji nowych aut osobowych w salonach samochodowych w Polsce

Zielińska Edyta

Autobusy : technika, eksploatacja, systemy transportowe

|

2019

|

R. 20, nr 12

241--244

PL

W niniejszym artykule przedstawiono informacje na temat najlepszych w latach 2015-2018, ze względu na liczbę sprzedanych nowych pojazdów, salonów samochodowych w Polsce, ale z wyłączeniem obiektów należących do producentów aut. Wymieniono także salony, które w ocenianym okresie wyróżniały się najwyższą jakością obsługi, najlepszą organizacją pracy i największą dostępnością do pojazdów testowych. W artykule tym zaprezentowano także dane na temat sprzedaży nowych samochodów osobowych w naszym kraju w ciągu ostatnich lat oraz wymieniono marki i modele cieszące się największą popularnością wśród Polaków. Ocenie poddano również preferencje klientów biznesowych i indywidualnych odnośnie zakupu nowego pojazdu osobowego, czyli przedstawiono najczęściej nabywane marki oraz modele aut w salonach samochodowych. Dla porównania przedstawiono również dane na temat najbardziej popularnych modeli nowych samochodów osobowych wśród Europejczyków oraz na świecie.

EN

The article provides information on the best car showrooms in Poland in 2015-2018 in terms of the number of new cars sold excluding the facilities belonging to the car manufacturers. Moreover, showrooms that excelled in the highest quality customer service, best work organizational workflow and the greatest availability of test drive cars were listed. The article also presents information on the sales of new passenger cars in Poland in the last few years and specifies brands and models that were the most popular among Polish. Business and individual customers preferences were also assessed in terms of buying a new passenger car, i.e. bestselling brands and models of cars in the showrooms were presented. Information about most popular models of new passenger cars among the Europeans and in the world was also presented for comparison.

10

Analiza natężenia ruchu drogowego na wybranych ulicach Szczecina w latach 2017–2018

Regulski Paweł, Abramek Karol Franciszek

Autobusy : technika, eksploatacja, systemy transportowe

|

2019

|

R. 20, nr 4

30--32

PL

W artykule przestawiono analizę badań natężenia ruchu drogowego na wybranych ulicach Szczecina, przeprowadzonych w październiku 2018 r., i dokonano porównania wyników badań z września 2017 r. Badania przeprowadzono na 3 wybranych ulicach w dni robocze w godzinach popołudniowego szczytu przewozowego. Określono liczbę samochodów osobowych w celu ewentualnego wykorzystania sieci infrastruktury kolejowej w ramach systemu komunikacji miejskiej.

EN

The article presents an analysis of traffic intensity on selected streets of Szczecin carried out in October 2018 and compared the results of research from September 2017. The research were carried out on three selected streets on working days in the afternoon transport peak. The number of passenger cars was determined in order to use the railway infrastructure network as part of the public transport system.

11

Modelowanie ruchu w Polsce z wykorzystaniem gminnego poziomu agregacji danych

Rosik P., Komornicki T., Goliszek S., Śleszyński P., Pomianowski W.

Transport Miejski i Regionalny

|

2018

|

nr 3

5--11

PL

Modelowanie osobowego ruchu drogowego na poziomie krajowym w Polsce nie było jak dotąd przedmiotem wielu pogłębionych analiz przestrzennych. Wynika to przede wszystkim z braku kompleksowych badań ruchu obejmujących cały kraj. Większość analiz realizowanych jest na poziomie miast lub aglomeracji, a w ostatnich latach – również na poziomie poszczególnych województw. Głównym celem artykułu jest rozwinięcie modelowania ruchu na całą Polskę, w szczegółowej skali przestrzennej (duża liczba rejonów transportowych na poziomie gminnym) z wykorzystaniem danych statystycznych wskazujących na lokalne uwarunkowania związane ze strukturą przestrzenną i społeczno-ekonomiczną oraz z układem powiązań funkcjonalnych. Celem poznawczym jest identyfikacja czynników mających wpływ na rozkład i natężenie ruchu pojazdów osobowych. Zaproponowana metodologia może być w przyszłości podstawą ustalenia zasad prognozowania ruchu na sieci drogowej całego kraju (na podstawie obserwacji specyficznych uwarunkowań regionalnych). Znajomość uwarunkowań regionalnych i lokalnych to szansa na terytorializację polityki transportowej (np. jako element zintegrowanych programów rozwojowych – ZPR – proponowanych w Strategii Odpowiedzialnego Rozwoju).

EN

Modeling of personal road traffic at the national level in Poland has so far not been the subject of many in-depth spatial analyzes. This is mainly due to the lack of comprehensive traffic research covering the whole country. Most analyzes are carried out at the level of cities or agglomerations, and in recent years – also at the level of individual voivodships. The main objective of the article is to develop traffic modeling for the whole of Poland, in a detailed spatial scale (a large number of transport zones at the commune level) using statistical data indicating local conditions related to spatial and socio-economic structure and functional relations. The cognitive goal is to identify factors affecting the distribution and intensity of passenger vehicle traffic. The proposed methodology may in the future be the basis for establishing the rules for forecasting traffic on the entire country's road network (based on observations of specific regional conditions). Awareness of regional and local conditions is an opportunity for territorialisation of transport policy (eg. as a part of integrated development programs – ZPR – proposed in the Strategy for Responsible Development).

12

The impact of vehicle dynamic parameters on the exhaust emissions in RDE tests

Pielecha J., Kurtyka K., Skobiej K.

Combustion Engines

|

2018

|

R. 57, nr 4

26--34

EN

The article compares driving test data using the latest legislative proposals applicable to passenger cars with different drives. For this purpose, cars of one type were selected, meeting the same exhaust toxicity standard (Euro 6c) and differing in used internal combustion engines (with spark-ignition, compression-ignition and hybrid drive). Several measurements were performed on the same test route in accordance with the RDE test guidelines, which requires a several of criteria to be met. These criteria include the length of the measuring sections, their overall timeshare and the dynamic characteristics of the drive. A portable emissions measurement system (PEMS) was used to record the engine and vehicle operating parameters and to measure the exhaust emissions during tests. This allowed for the monitoring of parameters such as: load value, engine speed and vehicle velocity. Then the obtained results were analyzed for their compatibility with the RDE procedure requirements. By determining the road emission of individual harmful compounds for all vehicles and the dynamic parameters of drive (relative positive acceleration and product of speed and positive acceleration) in various phases of the road test it was possible to compare them. On this basis, the impact of dynamic conditions of road tests on the obtained results of the road exhaust emission of harmful compounds for passenger cars with various drives was defined.

13

Observations from PEMS testing of combustion engines of different applications

Merkisz J., Pielecha J.

Combustion Engines

|

2018

|

R. 57, nr 3

40--55

EN

The article compares data obtained in road tests with the latest legislative proposals relating to various applications of internal combustion engines. Passenger car emission tests have been performed several times on the same test route in accordance with the RDE procedure guidelines, for which a dozen or so criteria must be met, including the distance of each of the drive sections, their in the drive time and the dynamic characteristics of the drive. The analysis was also based on a two-dimensional operating density characterization, presented in the vehicle speed-acceleration coordinates. As a result, it was possible to compare dynamic properties, operating time density and, thus, to check the validity of conducted drive tests in terms of their feasibility and emission values. An exhaust emission related comparison of three types of powertrain have been presented: gasoline, diesel and hybrid in the RDE tests. The authors proposed a new form of presenting the road exhaust emissions results in relation to the carbon dioxide emission, referred to as a standardization of the emission results. The exhaust emissions from city buses fitted with different powertrains tested on an actual bus route and in the SORT test were also compared.

14

Granice oporów ruchu w pojazdach : opór toczenia

Wrzecioniarz P. A., Ambroszko W, Pindel A.

Autobusy : technika, eksploatacja, systemy transportowe

|

2018

|

R. 19, nr 12

256--259

PL

W artykule omówione zostały granice oraz przykładowe metody minimalizacji oporu toczenia.

EN

In the paper limitations and exemplary methods of rolling resistance minimization are described. Changes of value of rolling resistance coefficient during years and values for exemplary rolling pairs are presented. Conclusions about future progress are formulated.

15

Granice oporów ruchu w pojazdach : opór aerodynamiczny

Wrzecioniarz A., Ambroszko W., Pindel A.

Autobusy : technika, eksploatacja, systemy transportowe

|

2018

|

R. 19, nr 12

252--255

PL

W artykule omówione zostały granice oraz przykładowe metody minimalizacji oporu aerodynamicznego.

EN

In the paper limitations and exemplary methods of aerodynamic drag force minimization in different kinds of vehicles are described. Changes of value of aerodynamic drag coefficient during years are presented. Conclusions about future possible new solutions in different kinds of vehicles are formulated.

16

Analiza natężenia ruchu drogowego na wybranych ulicach Szczecina

Regulski P., Abramek K. F.

Autobusy : technika, eksploatacja, systemy transportowe

|

2018

|

R. 19, nr 4

10--12

PL

W artykule przedstawiono analizę natężenia ruchu drogowego na wybranych ulicach Szczecina. Badania przeprowadzono na 3 wybranych ulicach w dni robocze w godzinach popołudniowego szczytu przewozowego. Określono liczbę samochodów osobowych w celu ewentualnego wykorzystania sieci infrastruktury kolejowej w ramach systemu komunikacji miejskiej.

EN

The article presents the analysis of road traffic intensity on selected streets of Szczecin. The research were carried out on three selected streets on working days in the afternoon transport peak. As part of the research, the number of passenger cars was determined in order to make possible the use of the railway infrastructure network as part of the public transport system.

17

Wykorzystanie powierzchni samochodów osobowych do prezentacji logo producenta marek popularnych i premium

Lotko A.

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

|

2017

|

z. 100

275--289

PL

Celem artykułu było porównanie wykorzystania powierzchni samochodów osobowych do prezentacji znaku graficznego (logo) dla marek popularnych i premium. Postawiono hipotezę roboczą, że powierzchnia logo pomiędzy tymi grupami różni się. Badanie przeprowadzono metodą instrumentalną. Mierzono fizyczne wymiary i obliczano powierzchnię logo umieszczonego z przodu pojazdu dla sześciu najpopularniejszych marek samochodów w Polsce – trzech popularnych i trzech premium. W rezultacie przeprowadzonego badania wykazano statystycznie istotne zróżnicowanie powierzchni logo marki w zależności od segmentu rynku – popularnego lub premium. Stwierdzone zróżnicowanie polega na tym, że w grupie marek premium powierzchnia logo jest większa niż w grupie marek popularnych. Nowością jest zastosowanie metod instrumentalnej, nieaksjologicznej w badaniach z zakresu kreowania wizerunku marki.

EN

The aim of the paper was to compare of the use of passenger cars surface to present a logo among popular and premium brands. A working hypothesis was stated that logo area differs between these two groups. The research was conducted with the use of an instrumental method. We measured physical dimensions and calculated the area of the logo placed in the front of the vehicle for six most popular car brands in Poland – three popular and three premium. As a result of a conducted research a statistically important differentiation of logo area between popular and premium brands was proofed. A stated differentiation is of such a nature that in the group of premium brands logo area is bigger than in the group of popular brands. A novelty of the paper is the use of an instrumental, non-axiological method in the area of research concerning creating a brand image.

18

Zastosowanie drzew klasyfikacyjnych w segmentacji rynku ze względu na wagę przypisywaną jakości części zamiennych do samochodów osobowych

Lotko A.

Problemy Jakości

|

2017

|

R. 49, nr 11

11--18

PL

Celem artykułu jest zbadanie, jaka jest struktura użytkowników samochodów osobowych ze względu na wagę przypisywaną jakości części zamiennych oraz które predyktory kształtują tę strukturę. Jako metodę gromadzenia danych wykorzystano ankietę zrealizowaną na próbie 498 klientów serwisów samochodowych. Do identyfikacji nominalnych i porządkowych predyktorów oraz charakterystyki uzyskanych segmentów zastosowano drzewa klasyfikacyjne w oparciu o zaawansowany algorytm CART (Classification and Regression Trees). Implikacją teoretyczną jest budowa modelu klasyfikacji użytkowników samochodów ze względu na predyktory charakteryzujące badanych, pojazdy i sposób ich eksploatacji. Implikacją praktyczną jest dostarczenie rekomendacji istotnych przy projektowaniu i wytwarzaniu części zamiennych w celu efektywnej segmentacji rynku. Wkładem własnym autora i elementem nowości jest zastosowanie drzew klasyfikacyjnych w badanym obszarze, a także uzyskana segmentacja rynku.

EN

The aim of the paper is to find out what the structure of passenger cars users concerning the weight ascribed to the quality of spare parts is and which predictors shape this structure. As a method of data acquisition a questionnaire filled in by 498 clients of garages was used. To identify nominal and ordinal predictors and characteristics of the obtained segments classification trees were used on a basis of the advanced CART (Classification and Regression Trees) algorithm. A theoretical implication is a construction of a model of car users according to the predictors characterizing users, vehicles and the way of their maintenance. A practical implication is a deliverance of recommendations important for an effective market segmentation when designing and manufacturing spare cars. Author’s contribution and a novelty element is the use of classification trees in the researched area, as well as the obtained market segmentation.

19

Wpływ wybranych parametrów technicznych na zużycie paliwa w samochodzie z silnikiem spalinowym

Urbańczyk M., Czech P., Gustof P., Turoń K., Urbańczyk R., Kołdys K.

Autobusy : technika, eksploatacja, systemy transportowe

|

2017

|

R. 18, nr 6

458--467, CD

PL

W dynamicznie rozwijającym się przemyśle motoryzacyjnym podstawowym problem jest zmniejszenie zużycia paliwa oraz emisji toksycznych związków znajdujących się w spalinach. Stale rosnąca liczba samochodów i wzrost natężenia ruchu powoduje, że problem użytkowania samochodów oraz ich wpływ na środowisko z roku na rok staje się coraz ważniejszy. Również ceny paliwa we współczesnych czasach coraz bardziej ukierunkowują kierowców na pojazdy o energooszczędnej eksploatacji, które pozwalają na obniżenie kosztów transportu. Użytkownicy pojazdów samochodowych coraz częściej zwracają uwagę na różnicę między rzeczywistym, a podanym przez producenta zużyciem paliwa. Celem badań była analiza parametrów technicznych samochodów, mających wpływ na zużycia paliwa w cyklu jazdy miejskim oraz drogowym.

EN

In the dynamically developing automotive industry the primary issue is to reduce fuel consumption and emissions of toxic compounds contained in exhaust gases. The constantly growing number of cars and the increase in traffic congestion means that the problem of car use and its impact on the environment from year to year is becoming increasingly important. Also fuel prices in recent times increasingly direct the drivers to vehicles with an energysaving operation, which allows reducing transport costs. Users of motor vehicles are increasingly turning attention to the difference between the actual fuel consumption and specified by the manufacturer. The aim of the study was to analyse technical parameters of cars, affecting fuel consumption in urban driving cycle and road driving cycle.

20

Atrybuty jakości części zamiennych do samochodów osobowych a profil użytkownika pojazdu

Lotko M., Lotko A.

Problemy Jakości

|

2016

|

R. 48, nr 11

29--38

PL

Celem przeprowadzonego badania było określenie, czy formalna charakterystyka użytkownika pojazdu, to jest jego profil, różnicuje ocenę ważności atrybutów jakości części zamiennych do samochodów osobowych. Jako metodę gromadzenia danych wykorzystano ankietę zrealizowaną na próbie 498 klientów serwisów samochodowych. Do identyfikacji atrybutów różnicujących zastosowano testy statystyczne Kruskala-Wallisa i Manna-Whitneya. Implikacją teoretyczną jest wykrycie atrybutów jakości części zamiennych, których wagi są różnicowane przez profil użytkownika pojazdu. Implikacją praktyczną jest dostarczenie rekomendacji istotnych przy projektowaniu i wytwarzaniu części zamiennych oraz komunikowaniu klientom użyteczności dostarczanej przez te części. Elementem nowości w artykule jest innowacyjny dobór atrybutów jakości części zamiennych, zastosowanie wybranych testów statystycznych w badanym obszarze, a także wykrycie zróżnicowania ważności tych atrybutów.

EN

The aim of the paper was to discover if formal characteristic of a car user, i. e. his profile, differentiates the assessment of weight of qualitative attributes of spare parts for passenger cars. As a method of collecting data a survey was used. It was realized on a sample of 498 clients of workshops. To identify differentiating attributes statistical Kruskal-Wallis and Mann-Whitney tests were applied. A theoretical implication is a discovery of qualitative attributes whose weights are differentiated by the profile of the vehicle user. A practical implication is delivering recommendations which are important during spare parts designing and manufacturing, as well as during communicating the usability delivered by these parts to the clients. Contribution of the paper is an innovative selection of qualitative attributes of spare cars, the use of selected statistical tests in the area of the research and also the discovery of the differentiation of the weights of these attributes.