>Delphi To Describe Advances in Diesel Injection and Control Systems at SIA Congress

At the upcoming SIA International Congress in Rouen, Delphi Corp. will present new developments in fuel injection equipment and engine control systems that help to substantially reduce overall diesel engine emissions, including CO2.

The paper, to be presented on 26 May as part of the “Innovative Injection Systems” session, will discuss enhancements to Delphi’s balanced-valve servo-solenoid system and advanced direct-acting piezo system. The upgrades include an increase in maximum operating pressure from 2000 bar up to 2400 bar with improved high-pressure atomization, enhancements to Delphi’s closed-loop control system, improved hydraulic efficiency, and reduced engine starting time to provide seamless stop-start.

The technologies are intended to simplify compliance with increasingly demanding emissions standards in Europe, such as Euro 6, and in other markets worldwide where high-efficiency diesel engines are increasingly recognized as an effective solution for CO2 reduction.

Delphi offers two families of common rail diesel injection system. The Multec system with balanced-valve fast servo-solenoid injectors offers equivalent performance to servo-piezo systems but at a much reduced cost. This latest system is featured on the new 1.2-liter Volkswagen Polo BlueMotion, which delivers 3.3 L/100km (71 mpg US) with CO2 emissions of just 87g/km. (Earlier post.)

The common rail system on the new Polo, the 2010 World Car of the Year, includes the latest evolution of Delphi’s servo-solenoid common rail system with the company's next generation DFP6 fuel pump. Delphi worked closely with Volkswagen to generate this world-leading performance.

For larger and very high-performance engines, Delphi’s direct-acting piezo injector delivers a high degree of control of the rate and shape of injection events, independent of rail pressure. This allows substantially reduced smoke emissions and therefore the use of increased EGR for affordable NOx reduction, while the elimination of fuel backflow allows significant system simplification.

Engine control. A significant development that will allow further reductions in CO2 and other tailpipe emissions is a new technique for direct combustion parameter control, based on real-time in-cylinder pressure measurement.

This approach to complete engine control will help enable the introduction of advanced low-emissions combustion strategies such as homogeneous charge compression ignition (HCCI), low temperature combustion (LTC) and pre-mixed charge compression ignition (PCCI). The performance of this new approach will also be addressed in Delphi’s technical paper.

Resources

• Noureddine Guerrassi, Philippe Bercher, Derk Geurts, Guillaume Meissonnier & Nebojsa Milovanovic (2010) Light Duty Common Rail Injection Technology for High Efficiency Clean Diesel Engines