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原文传递 Gasoline Direct Injection (GDI) Engine Wear Test Development

题名：	Gasoline Direct Injection (GDI) Engine Wear Test Development
作者：	Lee, P.
关键词：	Port fuel injection (PFI)##Development##Surface Layer Activated (SLA) parts##Gasoline direct injection (GDI)##Energy-Dispersive X-ray Spectroscopy (EDS)##Scanning Electron Microscope (SEM)##Engine lubrication wear##irradiated engine##Specifications development##Radioactive##Engine technology##
摘要：	Existing engine lubrication wear tests based on ILSAC and ACEA specifications were developed for engines and operating conditions representative of port fuel injection (PFI) engine technology. The automotive industry is trending away from the PFI engine towards gasoline direct injection (GDI) technology with approximately 40 percent of passenger cars sold in 2014 having GDI engines, many of which are turbo-charged. These turbo-charged GDI engines often produce more severe operating conditions than PFI engines due to their higher operating temperatures, cylinder pressures, and specific torques. In addition, most turbo GDI engines are downsized, therefore operating at higher loads for a greater portion of their operating cycle. Some vehicles use alternative combustion cycles or stop-start technology which further subjects the engine and lubricants to higher levels of stress compared to conventional PFI engines. In an effort to guide the development of engine lubrication wear tests in the next ILSAC and ACEA categories, the rings, liner and rod bearings of a modern turbo charged GDI engine, a Ford 2.0L Ecoboost engine, were irradiated and the engine assembled and placed on a test stand. The irradiation of these engine components resulted in the formation of different isotopes, depending on the component material. A series of in-field operating conditions were selected and the engine operated at these conditions using both a SAE 5W-30 oil and a SAE 0W-16 oil with the same additive package. Using the SwRI® Radioactive Tracer Technology (RATT®) the level of radioactive particles in the oil, present due to wear of the irradiated engine components, can be detected and the strength of the signal for each isotope can be correlated with the mass of wear material in the oil. Results showed no measureable wear in the connecting rod bearings, higher wear response from transient than steady state engine operating conditions, noticeably higher wear during stop-start and roughly only two thirds of the operating conditions resulted in higher wear in the measured engine components using SAE 0W-16 oil over SAE 5W-30 oil.
总页数：	88
报告类型：	科技报告