N
NateDogg
Guest
Sparked form other discussions and my knowledge of torque, here is a introduction of what I have learned on this matter.
In-cylinder pressure and engine torque have been reconized as fundamental preformance variables in internal comustion engines for a time now. Conventionally, the in-cylinder pressure has been directly measured using in-cylinder pressure transducers in a lab enviroment. Then, the indicated torque has been calculated from the measured in-cylinder pressure based on the engine geometry while the net engine torque has been obtained considering the torque losses. however, such direst measurements using conventional pressure sensors inside engine cylinders are not only very expensive but nit reliable for production engines. For this reason, the real world applications based on these fundamental performance variables in commercially produced cars have not been established yet. therefore, instead of employing the expensive yet not reliable approach, this research study investigates different approaches of obtaining and using such performance variables by estimating the net cylinder torque resulting from each combustion event while utilizing pre-existing sensors and essily accessible engine state variables, such as the instantaneous angular position and velocity of the crankshaft. This approach will enhance the on-board and real time estimations of engine state variables such as instantaneous torque in each individual cylinder and bring out many possible event-based applications for misfire detection and general purpose condition monitoring.
Ok with that said, The crankshaft of an engine is exposed to complex forces and torque exitations created by the cobustion process from each cylinder. These torque excitations cause the engine crankshaft to rotate at a certain angular velocity. And, the resulting angular speed of engine crankshaft to rotate at a certain angular velocity. And, the resulting angular speed of engine crankshaft consists of a slowly varying mean component and a quickly varying fluctuating componet around the mean value, caused by the combustion events in each cylinder. Outcome of the torque estimation approaches strongly relied on the ability to correlate the characteristics of the crankshaft angular position, speed, and its fluctuations to the characteristics of actual cylinder torque. Over the past years, this torque estimation problem has been investigated by numerous researches explicitly or implicitly, inverting an engine dynamic model of various complexities. Those researches have developed and validated the dynamic models describing the cylinder torque to the crankshaft angular velocity dynamics in internal comustion engines.
Kinda a mouth full, but I find it interesting.
more to come...in fact...a lot more
In-cylinder pressure and engine torque have been reconized as fundamental preformance variables in internal comustion engines for a time now. Conventionally, the in-cylinder pressure has been directly measured using in-cylinder pressure transducers in a lab enviroment. Then, the indicated torque has been calculated from the measured in-cylinder pressure based on the engine geometry while the net engine torque has been obtained considering the torque losses. however, such direst measurements using conventional pressure sensors inside engine cylinders are not only very expensive but nit reliable for production engines. For this reason, the real world applications based on these fundamental performance variables in commercially produced cars have not been established yet. therefore, instead of employing the expensive yet not reliable approach, this research study investigates different approaches of obtaining and using such performance variables by estimating the net cylinder torque resulting from each combustion event while utilizing pre-existing sensors and essily accessible engine state variables, such as the instantaneous angular position and velocity of the crankshaft. This approach will enhance the on-board and real time estimations of engine state variables such as instantaneous torque in each individual cylinder and bring out many possible event-based applications for misfire detection and general purpose condition monitoring.
Ok with that said, The crankshaft of an engine is exposed to complex forces and torque exitations created by the cobustion process from each cylinder. These torque excitations cause the engine crankshaft to rotate at a certain angular velocity. And, the resulting angular speed of engine crankshaft to rotate at a certain angular velocity. And, the resulting angular speed of engine crankshaft consists of a slowly varying mean component and a quickly varying fluctuating componet around the mean value, caused by the combustion events in each cylinder. Outcome of the torque estimation approaches strongly relied on the ability to correlate the characteristics of the crankshaft angular position, speed, and its fluctuations to the characteristics of actual cylinder torque. Over the past years, this torque estimation problem has been investigated by numerous researches explicitly or implicitly, inverting an engine dynamic model of various complexities. Those researches have developed and validated the dynamic models describing the cylinder torque to the crankshaft angular velocity dynamics in internal comustion engines.
Kinda a mouth full, but I find it interesting.
more to come...in fact...a lot more