Abstract
Keywords
Coaxial Vario Nozzle, Hydraulically Amplified Diesel Injector, CP4 High Pressure Pump, future Emission Legislation, Common Rail
Abstract
Future emission legislations will define a challenging goal for Diesel engine manufacturers.
Lowest emissions with highest engine performance, namely high specific power output, gasoline like noise levels, benchmarking low fuel consumption and attractive costs are defining the targets of their development activities for the future engines. Key for the success will be a sophisticated Fuel Injection System which supports all of these key requirements.
Therefore BOSCH did launch very early a fundamental project to define the requirements for future injection systems regarding mixture preparation, maximum injection pressure, rate shaping capability and multiple injections. Using several versatile prototype injection systems a comprehensive engine investigation was accomplished to determine the optimum system configuration for the above mentioned diesel engine goals.
Applying the criteria function performance, manufacturing robustness, durability over lifetime and costs the number of technical solutions has been reduced down to three concepts which were selected for the future product development process.
With the Piezo Vario Coaxial Nozzle Injector, the Hydraulically Amplified Diesel Injector and the 2-stage pressure amplified Common Rail System BOSCH will support the engine manufacturers to achieve challenging future emission goals in a wide spectrum of engine applications for cars and trucks. Maintaining the highest fuel metering accuracy, intelligent closed loop functions will drive the hydraulic system, which introduces additionally the innovative high pressure pump platform, the so-called CP4.