Browse Publications Technical Papers 2001-01-3686
2001-09-24

Statistical Model and Simulation of Engine Torque and Speed Correlation 2001-01-3686

Even under steady state operating conditions, the pressure variation in individual cylinders, and the corresponding gas-pressure torque are subjected to small random fluctuations from cycle to cycle. The gas-pressure torque of a cylinder may be expressed as a sum of harmonically variable components, each harmonic being affected by these fluctuations. A probabilistic model of the vector interpreting such a harmonic component is developed and used to determine the statistical parameters of the resultant random vector representing the corresponding harmonic order of the engine torque. At the low frequencies of the lowest harmonic orders of the engine torque the crankshaft behaves like a rigid body. This behavior permits to correlate the statistical parameters of the same harmonic components of the resultant torque and of the measured engine speed. This correlation is proved by experiments and used to identify faulty cylinders.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Accuracy Limits of IMEP Determination from Crankshaft Speed Mesurements

2002-01-0331

View Details

TECHNICAL PAPER

Presentation and Comparison of Three Multiaxial Fatigue Criteria Based on Stress Invariants Applied to a Crankshaft

2010-36-0316

View Details

TECHNICAL PAPER

Mazda New Lightweight and Compact V6 Engines

920677

View Details

X