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TECHNICAL PAPERS

Detecting and Correcting Cylinder Imbalance in Direct Injection Engines

[+] Author and Article Information
M. J. van Nieuwstadt, I. V. Kolmanovsky

Ford Motor Company, SRL MD 2036, 2101 Village Road, PO Box 2053, Dearborn, MI 48124-2053

J. Dyn. Sys., Meas., Control 123(3), 413-424 (Jul 06, 2000) (12 pages) doi:10.1115/1.1386647 History: Revised July 06, 2000
Copyright © 2001 by ASME
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References

Figures

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Graphical interpretation of the parameters in the QE fit
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Heat release QE fit for heat release curve with round diffusion burning. Measured: solid, fit: dash-dot.
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Cylinder pressure QE fit for heat release curve with round diffusion burning. Measured: solid, fit: dash-dot.
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Cylinder balancing from crankshaft measurements. Fuel correction [mg/str] (top), and imbalance measure (bottom) for a +20 percent offset in injector 4 (-.). The controller is switched on at the vertical line. The top window shows the 4 fuel corrections [mg/str], the bottom window shows the resulting passage times between teeth.
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Cylinder balancing from crankshaft measurements. Brake torque (top) and engine speed (bottom) for a +20 percent offset in injector 4 (-.). The controller is switched on at the vertical line. The top window shows the brake torque [Nm], the bottom window shows the resulting engine speed.
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Torque (top) and RPM (bottom) trace over one engine cycle with location of optimal detection window indicated by the square wave. N1=110,N2=170 degrees.
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Sweep of detection index α over the window beginning N1, with fixed N2=170 degrees after TDC
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Block diagram for integrating control
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Cylinder balancing on the 1.2 liter DIATA engine. Shown are the event resolved crank shaft accelerations, each trace corresponding to one cylinder. Balancing is switched on at the vertical line.
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Cylinder balancing from cylinder pressure. The controller is switched on at the vertical line. The fourth injector (-.) is biased by +20 percent. The top window shows the four fuel corrections [mg/str], the bottom window shows the resulting cycle-averaged torque for each cylinder [Nm].
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Detection index of cylinder balancing with cylinder pressure as a function of sampling rate for different engine speeds
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Cylinder balancing from the exhaust manifold pressure. The controller is switched on at the vertical line. The fourth injector (-.) is biased by +20 percent. The top window shows the 4 fuel corrections [mg/str], the bottom window shows the window-averaged pressures.
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Cylinder balancing from exhaust manifold pressure. The controller is switched on at the vertical line.
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Generic adaptive scheme for cylinder balancing
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Adaptive cylinder balancing based on crank accelerations. The controller is switched on at the vertical line. The fourth injector (-.) is biased by +20 percent. The top window shows the 4 fuel corrections [mg/str], the bottom window shows the resulting cycle-averaged torque for each cylinder [Nm].

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