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A Production Wide-Range AFR Control Algorithm for Direct-Injection Gasoline Application
Technical Paper
2001-01-0260
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SAE 2001 World Congress
Language:
English
Abstract
A Wide-Range Air-Fuel-Ratio (AFR) control algorithm was developed for production application in Direct Injection Gasoline (DI-G) powertrains. The algorithm controls AFR to a scheduled target by modifying open-loop fuel injection timing duration using a Wide-Range AFR sensor measurement for feedback.
A physically based hybrid State Estimator design was used to account for event-based engine delays and time-based sensor measurement characteristics to determine the error between target and measured AFR. The State Estimator was designed to minimize algorithm size, calibration burden, and engine controller throughput demand. A time based, gain-scheduled Proportional-Integral control algorithm design was used to correct AFR errors.
Non-physical estimation and control functions were designed for application with time-based updates to minimize engine controller throughput demand.
Signal generator capabilities were built into the algorithm to facilitate three-way catalyst perturbation during stoichiometric control, simulate unknown control system disturbances during algorithm calibration, and perform automatic catalyst efficiency sweeps.
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Citation
Maloney, P., "A Production Wide-Range AFR Control Algorithm for Direct-Injection Gasoline Application," SAE Technical Paper 2001-01-0260, 2001, https://doi.org/10.4271/2001-01-0260.Also In
Electronic Engine Controls: Modeling, Controls, Obd and Neural Networks
Number: SP-1585; Published: 2001-03-05
Number: SP-1585; Published: 2001-03-05
References
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- Franklin, G.F. et. al. “Digital Control of Dynamic Systems,” 2nd Addison-Wesley Publishing Company 1990
- Heywood, J. B. “Internal Combustion Engine Fundamentals,” McGraw-Hill 1988