DELPHI'S DIESEL UNIT PUMP COMMON RAIL SYSTEM

摘要

Emerging market countries specific needs have led Delphi to develop an innovative and cost-effective engine management concept that leverages advanced common rail technology: Delphi diesel Unit Pump Common Rail (UPCR) system. Designed for one to four-cylinder engine applications, Delphi's UPCR system is ideal for small engine vehicles developed for emerging markets as a low-cost alternative to the high-pressure pump used on common rails and for entry-level vehicles that will be marketed in developed regions. It is also well-suited for other non-automotive diesel engine products such as small agricultural and industrial equipment. Key features of the Delphi Diesel UPCR System include fast solenoid diesel injectors, a common rail, a program-tailored engine control module (ECM), an efficient, low cost fuel filter and a robust unit fuel pump with an inlet metering valve (IMV). This is the first time that an IMV is used in a unit pump system; which translates into better fuel economy. An additional key feature is its compact packaging. The pump of the 1600 bar system weighs up to four kilograms less than a conventional Common Rail High Pressure Pump, resulting in CO_2 emissions reduction. This light-weight system offers manufacturers a cost-effective, robust solution to help them achieve optimal fuel efficiency and meet stringent emissions standards. Finally, Delphi is developing a version capable of higher pressure for its UPCR system which will enable power and emission improvement in order to provide flexibility in engine family range. This pressure upgrade is combined with a system architecture upgrade to bring more CO_2 benefits. The purpose of this paper is to present how Delphi has applied the proven advantages of a common rail strategy to design a system that not only answers to the specific requirements of the emerging markets but will also benefit to developed regions needs and help manufacturers enhance the fuel efficiency of their products and meet stringent emissions standards, cost-effectively.