Application of a High Flexible Electronic Injection System to a Heavy Duty Diesel Engine

Future strict emission standards such as US 94 and EEC 96 for heavy duty diesel engines require injection systems more and more flexible. They have to be able to electronically control fueling, timing, and injection pressure as independent parameters. To be optimal this fuel injection equipment (F.I.E.) must be able to allow injection rate flexibility, separated pilot injection and cylinder cut-off. The F.I.E. from Nippondenso designated ECD-U2 offers all these characteristics. This paper deals with the installation and the application of this F.I.E. to a “RENAULT Véhicules Industriels” (R.V.I.) turbocharged and intercooled engine such as the MIDR 06.20.45 engine. Using the flexibility of ECD-U2,the US 91 emission targets for NOX and particulates were easily achieved with good fuel economy and the US 94 legislative standard was approached with limited development. The potential for further improvement in order to achieve the strictest emission standards looking beyond 1994 is also discussed in this paper.