Abstract

This report documents the first year's effort towards a 3-year program to develop micropilot ignition systems for existing pipeline compressor engines. In essence, all Phase I goals and objectives were met. We intend to proceed with the Phase II research plan, as set forth by the applicable Research Management Plan. The objective for Phase I was to demonstrate the feasibility of micropilot ignition for large bore, slow speed engines operating at low compression ratios. The primary elements of Micropilot Phase I were to develop a single-cylinder test chamber to study the injection of pilot fuel into a combustion cylinder and to develop, install and test a multi-cylinder micropilot ignition system for a 4-cylinder, natural gas test engine. In all, there were twelve (12) tasks defined and executed to support these two (2) primarily elements in a stepwise fashion. Task-specific approaches and results are documented in this report. Research activities for Micropilot Phase I were conducted with the understanding that the efforts are expected to result in a commercial product to capture and disseminate the efficiency and environmental benefits of this new technology. An extensive state-of-art review was conducted to leverage the existing body of knowledge of micropilot ignition with respect to retrofit applications. Additionally, commercially-available fuel injection products were identified and applied to the program where appropriate. This approach will minimize the overall time-to-market requirements, while meeting performance and cost criteria. The four-cylinder prototype data was encouraging for the micro-pilot ignition technology when compared to spark ignition. Initial testing results showed: (1) Brake specific fuel consumption of natural gas was improved from standard spark ignition across the map, 1% at full load and 5% at 70% load. (2) 0% misfires for all points on micropilot ignition. Fuel savings were most likely due to this percent misfire improvement. (3) THC (Total Hydrocarbon) emissions were improved significantly at light load, 38% at 70% load. (4) VOC (Volatile Organic Compounds) emissions were improved above 80% load. (5) Coefficient of Variance for the IMEP (Indicated Mean Effective Pressure) was significantly less at lower loads, 76% less at 70%. These preliminary results will be substantiated and enhanced during Phase II of the Micropilot Ignition program. Document type: Report

Abstract

Basic requirements related to fuel injection system of upgraded turbocharged articulated truck diesel engines are listed and discussed. An example of the FIE matching approach to upgrading of a heavy duty diesel engine is presented. The application of hollow cam fuel injection pump may offer a further extension of its use in order to uprate diesel engine performance. U radu su navedeni i opisani osnovni zahtjevi s obzirom na sustav za ubrizgavanje goriva kod pojačanih turbo artikularnih Dieselovih motora teretnih vozila. Dan je primjer pristupa prilagodbi opreme za ubrizgavanje goriva radi poboljšanja Dieselovih motora za teške uvjete rada. Primjena pumpe za ubrizgavanje sa šupljom bregastom osovinom može omogućiti daljnje proširenje njene uporabe kako bi se poboljšao rad Dieselovih motora.