Emission control and reduction in the combustion chamber of an internal combustion engine

Abstract

Introduction (problem statement and relevance). The task of emission control and reduction for internal combustion engines (ICE) is a relevant issue of the modern engine building. However, the catalytic converters potential is limited and almost exhausted. The paper authors study the possibility to partially reduce toxic emissions directly in the engine combustion chamber by means of the ceramic coating formed on the piston crown.The purpose of the paper is to study the influence of the coating formed by the method of microarc oxidation on the combustion chamber parts on the ICE exhaust toxicity.Methodology and research methods. The experimental method of research was applied. The research was carried out on the RMZ-551i engine. Engine tests were performed in various load modes: the rotation rate changed from 2000 to 6000 rpm, and the throttle opening amounted to 25, 50, 75 and 100% in each speed mode.Results. The paper presents experimental data proving the real possibility to decrease the ICE exhaust gas toxicity through formation of a ceramic coating on the piston crown. A relative decrease of carbon monoxide concentration in exhaust gases by 3.1% was noticed when using coatings on pistons compared to using standard pistons. Along with the decrease of CO amount, a relative increase of carbon dioxide (СО2) concentration by 2.1% is noticed.Practical significance. The provided experimental data obtained in the engine tests showed the possibility to partially reduce the amount of toxic components in exhaust gases directly in the combustion chamber by means of the coating on the piston crown formed by microarc oxidation method.