1997-02-24

Evaluation of Techniques for Absolute Cylinder Pressure Correction 970036

This paper addresses issues associated with the accurate determination of absolute cylinder pressure in internal combustion engines. Pressure referencing errors are shown to produce large errors in derived parameters such as polytropic index, mass fraction burned and charge temperature. Two alternative pressure correction methods, namely inlet manifold pressure and polytropic index referencing are investigated in detail. Sources of errors and algorithm improvements are investigated and discussed.
Comparison between the two pressure referencing techniques is made using measured cylinder pressure data obtained from a gasoline engine operating over a wide range of speeds and loads. The analysis shows that both of the methods should be capable of referencing typical experimental pressure data to within +-100 mbar. The work has demonstrated that accurate absolute pressure referencing can only be achieved if common pressure measurement errors are minimised.

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

Evaluation of Burn Rate Routines and Analysis Errors

970037

View Details

TECHNICAL PAPER

Adaptive Estimation of Cylinder Air Mass Using the Combustion Pressure

980791

View Details

TECHNICAL PAPER

The Effect of Crank Angle Resolution on Cylinder Pressure Analysis

910041

View Details

X