Wyniki wyszukiwania - BazTech

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Analysis of lubricating oil degradation and its influence on brake specific fuel consumption of a light-duty compression-ignition engine running a durability cycle on a test stand

Sala Rafał, Węglarz Kamil, Suchecki Andrzej

Combustion Engines

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2023

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R. 62, nr 4

109--115

EN

The Euro 6 emission standard requires compliance with tough legal exhaust emissions limits for newly registered vehicles and obligates light-duty vehicle manufacturers to respect the 160,000 km durability requirements for in-service conformity. Although there is no legal limit set for fuel consumption, manufacturers are obligated to decrease the carbon footprint of vehicle fleets in order to obtain carbon neutral mobility beyond 2035. The aim of this paper is to analyse the impact of various oils’ and viscosity grades’ degradation on the change in break specific fuel consumption (BSFC) measured over a standardized durability test cycle. Each oil candidate underwent 300 h of durability test running performed on a test bed without any oil changes. The purpose of the laboratory test was to reproduce the worst-case operating conditions and degradation process of the long-life engine oil type that can be experienced during extreme real life driving of a vehicle. In order to define the influence of the engine oil deterioration on the BSFC profile, the engine operation parameters were continually monitored throughout the test run. Additionally, chemical analysis of the oil was performed and the solid deposits formed on the turbocharger’s compressor side were evaluated. The test results revealed differences up to 5% in the BSFC values between the oil candidates tested over the durability cycle. The observed BSFC increase was directly related to the decrease in engine efficiency and can cause higher fuel consumption of the engine, which in turn has an adverse effect on environmental protection goals.

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Zmiana parametrów oleju silnikowego w trakcie próby trwałościowej na hamowni silnikowej

Suchecki Andrzej, Śledź Joanna, Brodzik Krzysztof

Napędy i Sterowanie

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2022

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R. 24, nr 3

88--93

PL

Niniejsze opracowanie przedstawia wyniki badań czterech rodzajów olejów silnikowych o podobnej klasie lepkościowej, różnych producentów. Badania polegały na przeprowadzeniu 400-godzinnych testów trwałościowych na hamowni silnikowej, na czterech nowych silnikach o zapłonie samoczynnym, o pojemności 1,9 l. Przedstawiono wyniki analiz chemicznych próbek olejów pobranych w trakcie testów. Zaprezentowano analizę zmian podstawowych parametrów określających jakość oleju w trakcie próby trwałościowej, takich jak lepkość kinematyczna, zawartość sadzy, wartość TBN i ilości pierwiastków metali. Zaproponowano limity podstawowych parametrów oleju określające jego własności trwałościowe.

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Comparison of fuel consumption and exhaust emissions in WLTP and NEDC procedures

Koszałka Grzegorz, Szczotka Andrzej, Suchecki Andrzej

Combustion Engines

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2019

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R. 58, nr 4

186--191

EN

Fuel consumption achieved in the New European Driving Cycle (NEDC) could be 50% lower than the fuel consumption in real driving conditions and in the case of emissions of regulated toxic compounds the differences could even be much greater. In order to bring the results achieved in official tests closer to real life figures, the European Commission introduced in 2017 the Worldwide Harmonized Light Vehicles Test Procedure (WLTP), which replaced the NEDC. In this article the results of fuel consumption and exhaust emissions for 3 cars fitted with engines of the same displacement but with direct and indirect gasoline injection, determined according to the NEDC and WLTC were presented. The results show that the effect of driving cycle on the fuel consumption is equivocal - for one car, fuel consumption was higher in the WLTC; for the other one in the NEDC; and for the third one, fuel consumption achieved in both driving cycles was practically the same. Emissions of regulated exhaust compounds, except for THC, obtained in the WLTC were higher than in the NEDC driving cycle.