Browse Publications Technical Papers 2001-01-0260
2001-03-05

A Production Wide-Range AFR Control Algorithm for Direct-Injection Gasoline Application 2001-01-0260

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.

SAE MOBILUS

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

Access SAE MOBILUS »

Members save up to 43% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.
X