Determination of Engine Cylinder Pressures from Crankshaft Speed Fluctuations
920463
02/01/1992
- Event
- Content
- An experimental test of a non-contact method for determining simultaneously the pressure in each cylinder of a reciprocating engine is reported. The method exploits a pattern recognition technique to compare crankshaft speed fluctuations to reference patterns in a knowledge base. The crankshaft speed is measured by timing the passage of gear teeth on the engine's flywheel.The experiment was carried out on a Detroit Diesel Corporation 6V-92TA engine. The baseline operating condition was 75 percent rated load at 1200 rpm. The engine's six cylinders were individually under-fuelled from the baseline operating condition to achieve peak pressure reductions of 5 to 20 percent. The required reference angular velocity waveforms were obtained by measuring the effect of under-fuelling individual cylinders to reduce their peak pressures by 10 percent.The experimental results show that the method evaluates the cylinder pressures with an RMS error of less than 6 percent. With further work. it is expected that a practical diagnostic tool could be developed for accurately determining cylinder pressures in diesel engines.
- Pages
- 11
- Citation
- Brown, T., and Neill, W., "Determination of Engine Cylinder Pressures from Crankshaft Speed Fluctuations," SAE Technical Paper 920463, 1992, https://doi.org/10.4271/920463.