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TECHNICAL PAPERS

Optimal Control for Bouncing Suppression of CNG Injectors

[+] Author and Article Information
D. Dyntar, L. Guzzella

Swiss Federal Institute of Technology (ETH), Zurich, Switzerland

J. Dyn. Sys., Meas., Control 126(1), 47-53 (Apr 12, 2004) (7 pages) doi:10.1115/1.1648311 History: Received October 28, 2002; Revised June 24, 2003; Online April 12, 2004
Copyright © 2004 by ASME
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References

Heywood, J. B. 1988, Internal Combustion Engine Fundamentals, McGraw-Hill, New York.
California Certification Exhaust Emission Standards, US Environmental Protection Agency, 2000, Office of Transportation and Air Quality, EPA420-B-00-001 February.
Holder,  G. D., Kamath,  V. A., and Godbole,  S. P., “The potential of natural gas hydrates as an energy resource,” Ann. Rev. Energy, 9 , 427.
Favrat, D., Germano, S., and Nicollerate, M., Ultra Rapid Natural Gas Port Injection, SAE 951913.
Mayergoyz,  I. D., Adly,  A. A., and Friedmann,  G., 1990, Appl. Phys., 5, 67.
Rist D., 1996, Dynamik realer Gase, Springer, Berlin, New York.
Jacobs, D. A. H. (ed.) 1997, The State of the Art in Numerical Analysis (London: Academic Press), Chapter 111.1 §§3-6 (by K. W. Brodlie).

Figures

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Cross-section of an injector (courtesy Robert BOSCH GmbH)
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Model of three connected subsystems of the electromagnet
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Sectional view of the electromagnetic circuit
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Test bench with optical position sensor for the investigation of the injector behavior used for parameter identification
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Comparison between predicted and measured system behaviors after battery voltage is switched on. Operating point: pgas=9.3 bar,ubatt=12 V,Rcoil=5.3 Ω.
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Switch-on and switch-off transients with typical bounce effects without bouncing suppression (Ch1.. Electronic Engine Control Unit-Pulse, Ch2.. ic [1 A/div], ChA.. Needle position [0.05 mm/div], Time.. [1 ms/div])
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Position and width of the braking pulses as shifted by the optimization algorithm. (Index t.,o for opening and t.,c for closing)
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Switch-on and switch-off transients with proposed optimal bouncing suppression (Ch1.. Optimal pulse pattern, Ch2.. ic [1 A/div], ChA.. Needle position [0.05 mm/div]
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Diagram of the optimization
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Test board with the FPGA chip and Σ−δ−A/D converter circuits
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The first six measurements of the control algorithm during the de-bouncing process at a sampling frequency of 25 Hz (3000 rpm). Scaling: Brake pulse (upper curve) 5 V/div, Injector needle position (lower curve) 0.05 mm/div, time 0.5 ms/div

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