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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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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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 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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