Experimental Investigation to Analyze the Effects of Oil Dilution on Unintended Acceleration in a Diesel Engine
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ght © 2020 KSAE/ 11701 pISSN 12299138/ eISSN 19763832
EXPERIMENTAL INVESTIGATION TO ANALYZE THE EFFECTS OF OIL DILUTION ON UNINTENDED ACCELERATION IN A DIESEL ENGINE Youngho Jun* Office of Defects Investigation, Korea Automobile Testing & Research Institute (KATRI), 200, Samjon-ro, Songsan-myeon, Hwaseong-si, Gyeonggi-do 18247, Republic of Korea (Received 3 September 2019; Revised 6 November 2019; Accepted 28 November 2019) ABSTRACTDue to the gradual reinforcement of emission regulations, exhaust gas after-treatment systems have become more complicated, and various engine control algorithms have been applied to diesel engines. However, the misuse of advanced exhaust gas after-treatment systems could cause additional problems. For instance, diesel vehicles that use of a diesel particulate filter (DPF) generally require periodic active regeneration. While operating active regeneration by in-cylinder postinjection, the fuel impinging on the cylinder wall would become the cause of oil dilution. Furthermore, if, in the event of excessive oil dilution, engine oil overflows in the engine oil pan, engine stalling or unintended acceleration (engine over-run) can occur, as lube oil flows into the combustion chamber through the intake manifold. The present study tested engine overrun by overflowing engine oil diluted with fuel on various engine operating conditions and clarify the engine control factors effect on engine stalling or unintended acceleration using regression analysis. Vehicle tests based on engine test analysis were also conducted to evaluate and reproduce the influence of unintended acceleration by automotive lube oil backflow in real driving. Vehicle test results indicate that unintentional acceleration could occur due to oil dilution, which put the driver at risk. KEY WORDS : Oil dilution, Unintended acceleration, Engine over-run, Regression analysis, Diesel engine, Diesel particulate filter (DPF) regeneration
NOMENCLATURE DPF EGR DOC SCR
reasons, BMW vehicles have been recalled worldwide (National Highway Traffic Safety Administration, 2018). As mentioned above, advanced exhaust gas aftertreatment systems can cause additional problems, such as EGR cooler leakage and VW diesel gate. Furthermore, oil dilution is another phenomenon caused by the advanced after-treatment system. Diesel vehicles, which make use of a diesel particulate filter (DPF), generally require periodic active regeneration that the accumulated soot is burnt off by high temperature formed by post-injection (Tschoke et al., 2010). At this time, while injecting fuel late in the cycle for active regeneration, fuel which is not emitted into an exhaust pipe could impinge on the cylinder wall and flow into the engine oil pan. In a recent comparative analysis of virgin lubricants, waste lubricants, and diesel oils, Yang and colleagues demonstrated that the waste lubricating oil was blended with diesel (Yang et al., 2016). These results support the claim that diesel flows into the engine oil pan. This phenomenon of mixing oil and fuel is called
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