On the path to intelligent engine diagnostics, the most important
decision lies firstly with which parameters to monitor, and secondly
with how to process these parameters to extract meaningful information.
Aided by advances in data storage and transmission, continuous measurement
of the instantaneous crankshaft torque at high sample rates and high
precision for such large applications, is a recent and non-intrusive measurement
technique, which can be of high value to the engine owner. Most
importantly, the instantaneous crankshaft torque is a single measurement
which encapsulates simultaneously information regarding the combustion
events in all engine cylinders for every instant, using only a single sensor. In
other words, this measurement acts as a signature for each type of engine
and its condition; i.e. its torque profile.