An experimental technique termed the Instantaneous IMEP Method has been developed to measure piston and ring assembly friction. The technique requires very accurate measurements of cylinder pressure, connecting rod force and calculation of inertial forces. Friction force is the difference of these forces in consideration of the slider-crank geometry. A grasshopper linkage has been used to transmit the connecting rod force signal measured by a strain gage bridge. Inertial forces have been calculated with the assumption of distributed connecting rod mass. The test engine was a Chevrolet 5 litre V-8, modified for single cylinder operation. Piston and ring assembly friction has been determined under motoring conditions with and without compression as well as firing. Friction measurements have been made with SAE 30 and 50 grade oils at different temperatures. Boundary friction has been observed especially near top and bottom dead centers. To date the technique has been used only for low speed engine operation.
Measurement of Piston and Ring Assembly Friction Instantaneous IMEP Method
Sae Technical Papers
SAE International Congress and Exposition ; 1983
01.02.1983
Aufsatz (Konferenz)
Englisch
Measurement of Piston and Ring Assembly Friction Instantaneous IMEP Method
Kraftfahrwesen | 1983
|Oil and Ring Effects on Piston-Ring Assembly Friction by the Instantaneous IMEP Method
SAE Technical Papers | 1985
|Oil and Ring Effects on Piston-Ring Assembly Friction by the Instantaneous IMEP Method
Kraftfahrwesen | 1985
|IMEP estimation from instantaneous crankshaft torque variation
Kraftfahrwesen | 1990
|IMEP Estimation from Instantaneous Crankshaft Torque Variation
SAE Technical Papers | 1990
|