21st Century Locomotive Technology: Quarterly Technical Status Report 12 DOE/AL68284-TSR12 Page: 2 of 4
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h*. 21st Century Locomotive Technology: Quarterly Technical Status Report 12
Task 1: Advanced Fuel Injection
Develop and demonstrate an advanced fuel injection system to minimize fuel consumption,
while meeting Tier 2 emissions levels.
Progress since last report
Over the last quarter, the production unit pump system (UPS) was installed on the single cylinder
engine (SCE). The UPS data, which represents the production engine performance, was used to
determine the performance entitlement of the high-pressure common rail (HPCR) system at
notch 4 and notch 8. This UPS data collected on the SCE was also compared with recent data
from a production design multi-cylinder engine (MCE) to investigate the performance
similarities and differences between the two engine systems.
Experimental milestones accomplished over this quarter:
In the last quarter we focused on collecting baseline data on the SCE. The baseline configuration
consists of the UPS fuel system, which is the current production fuel system design. The UPS
dataset consisted of a simple swing in injection timing, with selected data repeated on different
days. The UPS data served two proposes: The first purpose was to perform capping
experiments which, when compared with the HPCR engine data, quantify the entitlement of the
advanced fuel system on the SCE. An assessment of the HPCR system in comparison to the
UPS system at notch 4 and notch 8 has been established. Secondly, the SCE data with the UPS
was used in a study to explore the correlation of MCE and SCE performance. The results from
this study are summarized below and also will be further documented in an ASME publication.
Review of single cylinder engine test setup:
As this is the conclusion of a family of HPCR and UPS engine data, we take this opportunity to
summarize the test set-up and performance variables measured. Table 1 lists the key
measurements for the engine performance metrics, the measurement devices and their
Emissions and fuel consumption are compared on an indicated and brake specific basis. The
accuracy of the indicated-specific basis is extremely sensitive to the in-cylinder pressure signal
and top dead center phasing. This is one reason that brake specific performance variables are
more commonly used. When evaluating SCE data using different fuel systems, it is not trivial to
compare brake specific performance. For the UPS configuration the camshaft drives the fuel
pump, while the fuel pump on the HPCR system is externally driven. To compare the UPS and
the HPCR data on a brake specific basis, the estimated power to drive the common rail fuel
pump is subtracted from the measured brake power. This way, the brake specific datasets
represent engine systems with consistent parasitic loads and therefore can be compared. The
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Salasoo, Lembit; Topinka, Jennifer & Houpt, Paul. 21st Century Locomotive Technology: Quarterly Technical Status Report 12 DOE/AL68284-TSR12, report, April 14, 2006; United States. (digital.library.unt.edu/ark:/67531/metadc873768/m1/2/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.