Determination of the Gas-Pressure Torque of a Multicylinder Engine from Measurements of the Crankshaft's Speed Variation 980164
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.
Citation: 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. Download Citation
Dinu Taraza, Naeim A. Henein, Walter Bryzik
Wayne State University, US Army TARDEC
International Congress & Exposition
Electronic Engine Controls 1998: Sensors, Actuators, and Development Tools-SP-1356, SAE 1998 Transactions - Journal of Engines-V107-3