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Determination of the Gas-Pressure Torque of a Multicylinder Engine from Measurements of the Crankshaft's Speed Variation
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Abstract
The local variation of the crankshaft's speed in a multicylinder engine is determined by the resultant gas-pressure torque and the torsional deformation of the crankshaft. Under steady-state operation, the crankshaft's speed has a quasi-periodic variation and its harmonic components may be obtained by a Discrete Fourier Transform (DFT). Based on a lumped-mass model of the shafting, correlations are established between the harmonic components of the speed variation and the corresponding components of the engine torque. These correlations are used to calculate the gas-pressure torque or the indicated mean effective pressure (IMEP) from measurements of the crankshaft's speed.
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Taraza, D., Henein, N., and Bryzik, W., "Determination of the Gas-Pressure Torque of a Multicylinder Engine from Measurements of the Crankshaft's Speed Variation," SAE Technical Paper 980164, 1998, https://doi.org/10.4271/980164.Also In
Electronic Engine Controls 1998: Sensors, Actuators, and Development Tools
Number: SP-1356; Published: 1998-02-13
Number: SP-1356; Published: 1998-02-13
References
- Champoussin J.C. Ginoux S Engine Torque Determination by Crank Angle Measurements: State of the Art, Future Prospects SAE Paper 970532
- Garshelis I.J. Conto C.R. Fiegel W.S. A Single transducer for Non-contact Measurement of the Power, Torque and Speed of a Rotating Shaft SAE Paper 950536
- Hoyt C.D. Engine Mounted Torque Sensor Provides Diagnostic, Prognostic and Performance Data in Real Time in the Vehicle SAE Paper 950006
- Sobel J.R. Jeremiason J. Wallin C Instantaneous Crankshaft Torque Measurement SAE Paper 960040
- Garshelis I.J. Aleksonis J.A. Rotay R.M. Development of a Magnetoelastic Torque Transducer for Automotive Transmission Applications SAE Paper 970603
- Easy fit torque sensor fits between flanges Design Engineering July/August 1995
- Taraza D. Possibilities to Reconstruct Indicator Diagrams by Analysis of the Angular Motion of the Crankshaft SAE Paper 932414
- Taraza D. Estimation of the Mean Indicated Pressure from measurements of the Crankshaft Angular Speed Variation SAE Paper 932413
- Taraza D. Henein A.N. Bryzik W Experimental Determination of the Instantaneous Frictional Torque In Multicylinder Engines SAE Paper 962006
- Hafner K.E. Maass H Torsionsschwingungen in der Verbrennungskraftmaschine Springer Verlag Wien, New York 1985
- Chen K.S. Chang T Crankshaft Torsional and Damping Simulation - An Update and Correlation With Test Results SAE Paper 861226
- Taraza D. Dynamics of Internal Combustion Engine (in Romanian) 1985