Cummins and Scania are working together to produce next-generation fuel systems for heavy-duty on-highway diesel trucks.
The new XPI (Xtra-High Pressure Injection) systems, under development since 2003, will replace the current HPI fuel system, currently produced jointly by the two companies. Production of the XPI systems will begin early in 2006.
Cummins and Scania have partnered on fuel systems development and manufacturing since 1992.
Both manufacturers see the XPI system, which features higher injection pressures together with multistage injection, as an important tool in increasing combustion efficiency. Increased combustion efficiency reduces emissions—and so helping to meet coming EPA 2007 and Euro 5 engine requirements—as well as improving fuel consumption.
Higher injection pressures create smaller fuel droplets and higher injection velocity to promote a more complete burning of the fuel. This, in turn, maximizes power and minimizes pollution. By squirting needed amounts of fuel in a shorter time frame, a high pressure system can accommodate multiple injection events during each combustion cycle—again, allowing the engine control software to optimize combustion for particular conditions.
The XPI systems may reach up to 2,500 bar (that’s some 36,000 psi).