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TECHNICAL PAPERS: Internal Combustion Engines

Engine Torque Nonuniformity Evaluation Using Instantaneous Crankshaft Speed Signal

[+] Author and Article Information
N. Cavina, F. Ponti

DIEM—University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy

J. Eng. Gas Turbines Power 125(4), 1050-1058 (Nov 18, 2003) (9 pages) doi:10.1115/1.1581892 History: Received October 01, 2001; Revised December 01, 2002; Online November 18, 2003
Copyright © 2003 by ASME
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References

Figures

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MD evaluation for transient test #2 compared to the mapped threshold value (larger dots are the induced misfires)
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Engine speed and load torque trends during transient test #1
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Engine-brake dynamic model
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Engine speed waveform for an accidental misfire in cylinder 4 of a V6 engine running in a test cell at 3000 rpm
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Indicated torque mean value evaluation over different integration intervals for a V6 engine with cylinder 4 misfiring at the beginning of the second engine cycle
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Intervals investigated for optimal MD evaluation
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Engine speed evaluation before and after Interval 2
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Engine speed values to be used for MDi evaluation over Intervals 1 and 2
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Example of the Virtual ECU actuation signals to generate a misfire
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Steady-state operating conditions investigated to determine the misfire detection threshold map
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MD evaluation for the test at 4000 rpm engine speed and 160 Nm load torque (larger dots represent the induced misfires)
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MD evaluation for the test at 4000 rpm and 160 Nm in the vicinity of a misfire event
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MD waveform after a misfire for the test at 4000 rpm engine speed and 160 Nm load torque
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MD evaluation for the test at 4000 rpm and 160 Nm in the vicinity of a misfire event, after the torsional vibration effects have been filtered away
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MD evaluation for the test at 1150 rpm engine speed and 24 Nm load torque (larger dots represent the induced misfires)
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MD and indicated torque values in cylinder #4 for the test at 1150 rpm and 24 Nm
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MD versus indicated torque values in cylinder #4 for the test at 1150 rpm and 24 Nm
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MD and indicated torque values in cylinder #6 for the test at 1150 rpm and 24 Nm
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MD versus indicated torque values in cylinder #6 for the test at 1150 rpm and 24 Nm
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MD evaluation for transient test #1 compared to the mapped threshold value (larger dots are the induced misfires)
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Engine speed and load torque trends during transient test #2
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Steady-state tests performed on the 1.2 liters L4 engine
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Difference between the MD evaluated for cylinder #1 and #4, versus difference between the indicated torque developed in the same cylinders

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