Quieter diesels with greater torque and less emissions

Common-rail injection equipment flexibility gives Delphi Diesel Systems development engineers latitude in critical engine-system designs.

Good fuel economy is, and always has been, the prime reason for specifying a compression-ignition engine. Increasing global concern over carbon dioxide emissions provides an additional reason for using a diesel - the most efficient powerplant. In Europe, buyers are demanding diesel powertrains with higher torque and more refinement. Fuel-injection equipment and the air-management system are the key parts that control engine torque, emissions, noise quality, and specific fuel consumption.

Compression-ignition direct-injection (CIDI) combustion can use high boost pressures to improve torque, with turbochargers the approach favored by most designers. New turbochargers make more air available at low engine speeds, improving response during engine transients. Fuel-injection equipment has to develop in parallel with turbochargers. Higher injection pressures are required partly to mix the fuel effectively with an air charge that is more dense, to provide a high power output, and partly to reduce smoke generation.