In order to fulfill the LEV/ULEV exhaust emission standards, it is necessary to have a precise control of air fuel ratio under transient conditions especially during cold start and warm up periods. The objective in this study was to estimate parameters of a fuel delivery model and use them to provide a correct fuel injection compensation strategy. In this study, fuel transfer characteristics of intake port of a typical fuel-injected spark ignition engine have been determined for engine warm-up conditions following cold starts at temperature down to −15°C and extending to fully-warmed-up conditions, using a method based upon perturbing fuel injection rate and recording AFR (Air Fuel Ratio) response. Since there was no cold chamber available to perform tests in cold start conditions, a new method was utilized to simulate cold start conditions. This method can be used on any PFI engine with closed valve injection strategy. Following the estimation of fuel transfer model parameters, the variation of fuel film deposit factor (X), fuel film evaporation time constant (τf) and transport delay to oxygen sensor (ΔT) parameters over a range of temperatures, engine speeds and intake manifold pressures have been evaluated, providing a good insight to define transient fuel compensation requirements for cold start and warm up conditions.
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ASME 2004 Internal Combustion Engine Division Fall Technical Conference
October 24–27, 2004
Long Beach, California, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
0-7918-3746-7
PROCEEDINGS PAPER
A Novel Method to Estimate Parameters of the Wall-Wetting Fuel Model in MPFI Engines for Cold Start and Warm Up Conditions Available to Purchase
M. Shahbakhti,
M. Shahbakhti
IRAN KHODRO Engine Research, Design, and Manufacturing Company (IPCO), Tehran, Iran
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M. Ghafuri,
M. Ghafuri
IRAN KHODRO Engine Research, Design, and Manufacturing Company (IPCO), Tehran, Iran
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A. R. Aslani,
A. R. Aslani
IRAN KHODRO Engine Research, Design, and Manufacturing Company (IPCO), Tehran, Iran
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A. Sahraeian,
A. Sahraeian
IRAN KHODRO Engine Research, Design, and Manufacturing Company (IPCO), Tehran, Iran
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S. A. Jazayeri,
S. A. Jazayeri
K.N.T University of Technology, Tehran, Iran
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S. Azadi
S. Azadi
K.N.T University of Technology, Tehran, Iran
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M. Shahbakhti
IRAN KHODRO Engine Research, Design, and Manufacturing Company (IPCO), Tehran, Iran
M. Ghafuri
IRAN KHODRO Engine Research, Design, and Manufacturing Company (IPCO), Tehran, Iran
A. R. Aslani
IRAN KHODRO Engine Research, Design, and Manufacturing Company (IPCO), Tehran, Iran
A. Sahraeian
IRAN KHODRO Engine Research, Design, and Manufacturing Company (IPCO), Tehran, Iran
S. A. Jazayeri
K.N.T University of Technology, Tehran, Iran
S. Azadi
K.N.T University of Technology, Tehran, Iran
Paper No:
ICEF2004-0809, pp. 203-214; 12 pages
Published Online:
December 11, 2008
Citation
Shahbakhti, M, Ghafuri, M, Aslani, AR, Sahraeian, A, Jazayeri, SA, & Azadi, S. "A Novel Method to Estimate Parameters of the Wall-Wetting Fuel Model in MPFI Engines for Cold Start and Warm Up Conditions." Proceedings of the ASME 2004 Internal Combustion Engine Division Fall Technical Conference. ASME 2004 Internal Combustion Engine Division Fall Technical Conference. Long Beach, California, USA. October 24–27, 2004. pp. 203-214. ASME. https://doi.org/10.1115/ICEF2004-0809
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