Similar to progression in automotive technology from carburetted engines to multi point fuel injection technologies, to save fuel over the diesel traction, a Common Rail Electronic Direct Injection (CReDI) fuel injection system for railroad application has been developed for ALCO engines at Research Designs and Standard Organization, Indian Railways (IR), Lucknow. CReDI system offers flexibility of modulating fuel injection pressures coupled with dynamic start of injection at each power setting, designated as locomotive engine notch. This flexibility in the system is independent of engine rpm and its values decided after detailed fuel mapping on an engine test bed. Injector geometry for CReDI is selected through simulation, experimentation and verification studies for spray angle and sauter mean diameter of the fuel droplet, so as to enhance combustion efficiency.
CReDI wet components comprising of injectors, high pressure pumps, common rails etc. are mounted on the engine itself and are controlled through an electronic engine management system harmonized with the traction control system of the locomotive. Mechanical integrity and compatibility of the CReDI system vis a vis other engine sub assemblies is proven and system designed within operational limits of the power pack. CReDI system is considered as both a retrofit and a new manufacture solution for replacement of the exiting mechanical fuel injection systems being used on IR diesel locomotives. Besides fuel savings over the traction duty cycle, use of CReDI system results in lower carbon dioxide emissions and other key engine exhaust stack emissions like hydrocarbons, oxides of nitrogen, carbon monoxide, particulate matter etc.
Article Details
Unique Paper ID: 142348
Publication Volume & Issue: Volume 2, Issue 1
Page(s): 225 - 227
Article Preview & Download
Share This Article
Join our RMS
Conference Alert
NCSEM 2024
National Conference on Sustainable Engineering and Management - 2024