© Mykola Tsiuman, PhD, Associate Professor,
Acting Head of Department of Engines and Heat-ing Engeneering,
ORCID: 0000-0003-2537-8010,
e-mail: tsuman@ukr.net;
© Ivan Sadovnyk, postgraduate student of Department of Engines and Heating Engeneering
ORCID: 0009-0009-4366-6236,
e-mail: toyota-kiev@ukr.net
(National Transport University)
RESEARCH ON THE EFFICIENCY OF CATALYTIC CONVERSION OF EXHAUST GASES FROM A CAR ENGINE DURING WARM-UP MODE
DOI: 10.33868/0365-8392-2024-2-279-70-73
Abstract. The article is dedicated to researching the efficiency of catalytic conversion of exhaust gases from VW BBY car engine (4FS 7.65/7.56) during warm-up mode. The objective of the study is to determine the impact of structural and operational factors of emission control systems on their efficiency during the warm-up phases of car engines. A compre-hensive research methodology has been developed, which includes experimental investigations of the engine and catalyt-ic converter warm-up processes and their influence on harmful emissions. It has been established that during engine warm-up at idle, the attainment of chemical and thermal conditions necessary for the effective operation of the exhaust gas neutralization system occurs at different times: chemical conditions are reached earlier, while thermal conditions are reached later. The nominal efficiency of neutralizing various harmful exhaust gas components (CO, HC, NO) is achieved at different times and temperatures of the catalytic converter: for NO in 180 seconds at 295 °C; for CO in 220 seconds at 305 °C; and for HC in 400 seconds at 330 °C. The necessary chemical operating conditions are reached in 100 seconds at 230 °C. Furthermore, the attainment of the system’s nominal neutralization efficiency is almost independent of the time taken for the engine to reach its operational temperature based on the coolant temperature. The primary catalytic converter has little impact on emission levels in this mode due to not reaching its operational temperature. The results of the experimental research provide an opportunity to refine the theoretical model for determining the influence of structural and operational factors of emission control systems on harmful emissions and to establish a combination of factors for reducing emissions.
Keywords: car engine, operating mode, fuel consumption, catalytic converter temperature, concentrations of harmful substances, exhaust gases.
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