Advanced Injectors for Common Rail Fuel Systems in Medium-Speed Diesel Engines. Concept and Design

Continuous tightening of environmental regulations on harmful substance content in exhaust fumes of diesel engines determines modern diesel engine development. It is important to recognize the need to reduce toxic emissions already at the design stage of the working process. Variable-geometry turbochargers, exhaust gas recirculation, variable valve timing, optimized combustion chamber and modern fuel injection systems are the main methods to achieve this goal. Therefore, there are stricter requirements to fuel injection equipment to ensure low-emission levels of the combustion process. The ability of the fuel injection equipment to shape the injection rate is one of the most relevant features. This article describes the main performance indicators of advanced designs of electro-hydraulic common rail injectors. Generalized requirements to the shape of the injection rate for medium-speed diesel engines are formulated. The design of advanced fuel injection equipment is conceptualized. The developed designs of electro-hydraulic injectors that can shape the injection rate are described.

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