0
Research Papers: Internal Combustion Engines

Cold Engine Transient Fuel Control Experiments in a Port Fuel Injected CFR Engine

[+] Author and Article Information
Leonard J. Hamilton

Mechanical Engineering Department, United States Naval Academy, 590 Holloway Road, Annapolis, MD 21402ljhamilt@usna.edu

Jim S. Cowart

Mechanical Engineering Department, United States Naval Academy, 590 Holloway Road, Annapolis, MD 21402cowart@usna.edu

J. Eng. Gas Turbines Power 130(3), 032812 (Apr 03, 2008) (9 pages) doi:10.1115/1.2830865 History: Received October 30, 2007; Revised November 05, 2007; Published April 03, 2008

Air-fuel mixture preparation is particularly challenging during cold engine throttle transients due to poor fuel vaporization and transport delays in port fuel injected (PFI) engines. In this study, a PFI cooperative fuels research engine is used to evaluate torque and to measure in-cylinder and exhaust CO, CO2, and unburned hydrocarbons during throttle transients at various early stages of engine warmup. Fast flame ionization detectors and nondispersive infrared fast CO and CO2 detectors are used to provide a detailed cycle-by-cycle analysis. Ttorque after cold throttle transients is found to be comparable to steady-state torque due to allowable spark advance. However, cold transients produce up to four times the unburned hydrocarbons when compared to steady-state operation. Finally, the x-tau fuel control model is evaluated in this challenging operating regime and is found to provide poor transient fuel control due to excessive fueling.

Copyright © 2008 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Experimental apparatus schematic

Grahic Jump Location
Figure 2

Probe configuration in the CFR cylinder head

Grahic Jump Location
Figure 3

Representative engine cycle with simultaneous diagnostic signals

Grahic Jump Location
Figure 4

Base line engine parameters (not including emission measurements)

Grahic Jump Location
Figure 5

Post-main-combustion peak in-cylinder CO2

Grahic Jump Location
Figure 7

Commanded fuel pulse width (ms)

Grahic Jump Location
Figure 8

Cycle-by-cycle IMEPg (torque)

Grahic Jump Location
Figure 9

Cylinder pressure traces for various WOT cycles after 60s warmup

Grahic Jump Location
Figure 10

Cycle-by-cycle residual burned gas fraction

Grahic Jump Location
Figure 11

Cycle-by-cycle peak combustion pressure

Grahic Jump Location
Figure 12

Peak pressure location (180deg=top center combustion)

Grahic Jump Location
Figure 13

Heat release rate for throttled operation

Grahic Jump Location
Figure 14

Heat release rate eight cycles after WOT transition

Grahic Jump Location
Figure 15

UHC measured at the exhaust manifold next to the exhaust port

Grahic Jump Location
Figure 16

Postcombustion in-cylinder hydrocarbons

Grahic Jump Location
Figure 17

Exhaust CO concentration

Grahic Jump Location
Figure 18

Exhaust CO2 concentration

Grahic Jump Location
Figure 19

x-tau model fuel compensation

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In