A Simple Virtual Sensor for Combustion Timing

[+] Author and Article Information
U. Holmberg

M. Hellring

Halmstad University, Box 823, S-301 18 Halmstad, Sweden

J. Dyn. Sys., Meas., Control 125(3), 462-467 (Sep 18, 2003) (6 pages) doi:10.1115/1.1589034 History: Received March 12, 2002; Revised November 11, 2002; Online September 18, 2003
Copyright © 2003 by ASME
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Normalized work as a function of PPP for different engine loads; Wk,k=1,2,3 corresponds to 0–15, 15–30, and 30–45% of maximal load
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Averaged ion current (solid) and pressure (dashed) using 100 consecutive cycles in a laboratory environment under constant external conditions (1500 RPM and 70% of maximal load)
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Single cycle ion current (solid) and pressure (dashed) sampled on board the SAAB car while driving on the highway. The engine speed was 1500 RPM and the load was approximately 25% of maximum. Notice that there are several peaks in the flame front phase while the post flame phase is hardly visible.
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Performance of different virtual PPP sensors for varying PPP settings. All signals are low pass filtered for clarity. a) PPP sensor (solid), MLP estimate (dotted), SQUAD estimate (dashed), DD estimate (dashed–dotted). b) MLP estimate vs PPP sensor, c) SQUAD estimate vs PPP sensor, d) DD estimate vs PPP sensor.
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Closed-loop virtual sensor control. Nine batches of 800 consecutive combustion cycles are concatenated to show performance during real-time control. a) Low pass filtered PPP (thick: Sensor, thin: Virtual sensor) and IGN (ignition crank angle). The setpoint for the virtual sensor PPP was 15 CAD ATDC. b) MAP (Manifold air pressure): approximately proportional to load. c) Motor speed (RPM). A small village was passed in the middle, showing breaking, change of gear (4), acceleration, change of gear (5) and speed control.




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