Fuel Injection/Combustion for Advanced Military Diesel Engines

Fundamentally, increasing engine power density, without an associated increase of engine speed, requires increasing the brake mean effective pressure (BMEP) as high as practical. Achieving the highest possible peak cylinder pressure, compatible with engine structural capability and desired life in order to obtain high power and goo fuel economy, requires innovative approaches in fuel injection system and combustion enhancement rechniques. One of the approaches is to allow combustion to continue much later into the expansion stroke. This increases the BMEP without an accompanying increase in exhaust temperature, particulate emissions and smoke. Potential technologies to accomplish these objectives include ultr-high injection pressure, ijection rate control and/or split injection, combustion chamber and air-charge manaegment, are identified. Multiple injectors per cylinder is anticipated to increase fuel quantity and to control injection rate within the reduced duration limits. Each of these technologies has its own important parameters effecting engine efficiency and exhaust emissions formation. The greatest challenge of this project is identifying optimum settings and viable solutions by searching for small improvements from a large number of parameters. Using the proven Servojet electrohydraulic fuel injection system and advnaced fuel ijection simulation software, BKM will concentrate on development and integration of the injection characteristics of the ultra-high pressure fuel injection system. Performance characteristics of an advanced fuel injection system shall be provided and subtantiated by analytical calculations, computer simulations and predictions.