TY - JOUR AU - Nagy, AndrĂ¡s Lajos AU - Knaup, Jan Christopher AU - Zsoldos, Ibolya PY - 2019/07/15 Y2 - 2024/03/28 TI - Investigation of Used Engine Oil Lubricating Performance Through Oil Analysis and Friction and Wear Measurements JF - Acta Technica Jaurinensis JA - Acta Tech. Jaurinensis VL - 12 IS - 3 SE - Vehicle, Mechanical Engineering and Mechatronics DO - 10.14513/actatechjaur.v12.n3.495 UR - https://acta.sze.hu/index.php/acta/article/view/495 SP - pp. 237-251 AB - <p>Engine oil degradation during long-term engine operation is a well-researched&nbsp;topic, however, the effect of biofuels and synthetic compounds&nbsp;is not fully understood. In order to characterise novel fuel related&nbsp;phenomena in an engine a basis of studies should be established with&nbsp;state-of-the-art engines and conventional fuels and lubricants. This study&nbsp;aims at describing the behaviour of used engine oils throughout their&nbsp;service life based on friction and wear measurements with oil samples&nbsp;from three identical light-duty direct injection supercharged diesel engines.&nbsp;Oil samples were taken from each engine every 50 hours between&nbsp;oil changes to determine physical properties and chemical composition.&nbsp;Friction and wear measurements were conducted on a high-frequency&nbsp;reciprocating rig. The results show strong correlation between oil service&nbsp;life and boron content, as well as acid number and base number. A&nbsp;similar correlation between coefficient of friction with used samples and&nbsp;boron content as well as soot content was observed. A simple model&nbsp;based on a polynomial fitting function was proposed to predict friction&nbsp;and wear from boron content, total acid number and total base number.</p> ER -