Due 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 post-injection, 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.

由于排放法规的逐步加强，废气后处理系统变得更加复杂，并且各种发动机控制算法已应用于柴油发动机。但是，滥用先进的废气后处理系统可能会引起其他问题。例如，使用柴油机微粒过滤器（DPF）的柴油车通常需要定期进行主动再生。当通过缸内后喷射进行主动再生时，撞击在缸壁上的燃油将成为机油稀释的原因。此外，如果在机油过多稀释的情况下机油在机油盘中溢流，则可能会发生发动机熄火或意外加速（发动机超速运转），因为润滑油通过进气歧管流入燃烧室。本研究通过在不同的发动机工况下溢出用燃料稀释的机油来测试发动机的超速运行，并通过回归分析阐明了发动机控制因素对发动机熄火或意外加速的影响。还进行了基于发动机测试分析的车辆测试，以评估和重现真实驾驶中汽车润滑油回流对意外加速的影响。车辆测试结果表明，由于机油稀释会导致意外加速，从而使驾驶员处于危险之中。还进行了基于发动机测试分析的车辆测试，以评估和重现真实驾驶中汽车润滑油回流对意外加速的影响。车辆测试结果表明，由于机油稀释会导致意外加速，从而使驾驶员处于危险之中。还进行了基于发动机测试分析的车辆测试，以评估和重现真实驾驶中汽车润滑油回流对意外加速的影响。车辆测试结果表明，由于机油稀释会导致意外加速，从而使驾驶员处于危险之中。