This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Simplified Procedure for Basic Open Loop Calibration Maps in Spark Ignition Engines
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 06, 2010 by SAE International in United States
Annotation ability available
One of the biggest challenges in the development of a new engine and/or control system basic calibration is the construction of initial open loop maps when component characteristic curves are not available yet. It is very common in this development phase to have cylinder air charge or fuel injector terms, which effect final commanded fuel injector pulse width (i.e., injector opening time), being assigned (compensated) to wrong calibration maps as a result of the lack of reliable component characteristic curves at the beginning of calibration development. This paper presents a practical and simplified procedure for raising the basic engine maps for cylinder air mass filling, volumetric efficiency, fuel injector static flow and offset in either an engine bench or chassis dyno. This method has proven to be accurate enough to allow continuing with the basic calibration development. Comparisons to suppliers final characteristics curves show a deviation lower than 3%. Closed loop correction shows deviations lower than 5%.
CitationEngler-Pinto, C., de Nadai, L., and Penteado, V., "Simplified Procedure for Basic Open Loop Calibration Maps in Spark Ignition Engines," SAE Technical Paper 2010-36-0326, 2010, https://doi.org/10.4271/2010-36-0326.
- Engler-Pinto, C.M. de Nadai, L. “Volumetric Efficiency and Air-Fuel Ratio Analysis for Flex Fuel Engines,” SAE Technical Paper 2008-36-0223 2008 10.4271/2008-36-0223
- Theunissen, F.M.M. “Percent Ethanol Estimation on Sensorless Multi Fuel Systems; Advantages and Limitations,” SAE Technical Paper 2003-01-3562 2003 10.4271/2003-01-3562
- SAE International Surface Vehicle Recommended Practice “Low Pressure Gasoline Fuel Injector,” SAE Standard J1832 Feb. 2001
- Roussopoulos, K. “A Convenient Technique for Determining Comparative Volumetric Efficiency,” SAE Technical Paper 900352 1990 10.4271/900352
- Heywood, J. B. “Internal Combustion Engine Fundamentals” McGraw-Hill 1988
- Kotwicki, A. Russell, J. Pursifull, R. Lewis, D. “An Air Meter Based Cylinder Air Charge Estimator,” SAE Technical Paper 1999-01-0856 1999 10.4271/1999-01-0856
- Turin, R. Zhang, R. “Physics-Based Volumetric Efficiency Model of an SI Engine” GM Research Report, ECI-197 2004