Instantaneous frictional torque of reciprocating combustion engines.

摘要

A new method, (P-;The errors involved in the measurements of the cylinder pressure, P, and engine angular velocity, ;The method has been applied to a single cylinder Diesel engine under different operating conditions. The mobility method has been used to model the frictional torque of the engine bearings. The experimental results along with the predictions of the bearing modeling showed, the frictional losses of the piston ring pack to be the major contributor to the engine's instantaneous frictional torque. Additionally they showed the instantaneous frictional torque during the compression-expansion strokes to be of the mixed lubrication type, and of the same type during the first cycle of the starting process. The first compression-expansion of the starting process showed exceedingly high frictional losses, the result of the very poor lubrication of the piston ring pack.