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Barometric Pressure Estimator for Production Engine Control and Diagnostics
Technical Paper
1999-01-0206
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A Barometric Pressure Estimator (BPE) algorithm was implemented in a production speed-density Engine Management System (EMS). The BPE is a model-based, easily calibrated algorithm for estimating barometric pressure using a standard set of production sensors, thereby avoiding the need for a barometric pressure sensor. An accurate barometric pressure value is necessary for a variety of engine control functions.
By starting with the physics describing the flow through the induction system, an algorithm was developed which is simple to understand and implement. When used in conjunction with the Pneumatic and Thermal State Estimator (PSE and TSE) algorithms [2], the BPE requires only a single additional calibration table, generated with an automated processing routine, directly from measured engine data collected at an arbitrary elevation, in-vehicle or on a dynamometer.
The algorithm has been implemented on several different engines. Results from testing at near sea level and at higher altitudes are presented.
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Citation
Olin, P. and Maloney, P., "Barometric Pressure Estimator for Production Engine Control and Diagnostics," SAE Technical Paper 1999-01-0206, 1999, https://doi.org/10.4271/1999-01-0206.Also In
Electronic Engine Controls 1999: Sensors, Actuators, and Development Tools
Number: SP-1418; Published: 1999-03-01
Number: SP-1418; Published: 1999-03-01
References
- Heywood, J.B. “Internal Combustion Engine Fundamentals,” McGraw-Hill 1988
- Maloney, P. J. Olin P.M. “Pneumatic and Thermal State Estimators for Production Engine Control and Diagnostics,” SAE 980517 1997
- Maloney, P. J. “A Plant Modeling Process for Practical Control System Design,” IFAC Workshop: Advances in Automotive Control Mohican State Park, Ohio 1998