Model-Based Air-Fuel Ratio Control in SI Engines with a Switch-Type EGO Sensor Stanford Univ

Format:

Conference/Event

Author/Creator:

Amstutz, Alois, author.

Conference Name:

International Congress & Exposition (1994-02-28 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1994

Summary:

High bandwidth control of the air-fuel ratio is necessary in order to minimize the exhaust emissions of spark-ignition engines with three-way catalytic converters. A new approach is to implement a control structure based on modern control and estimation theory. This work describes the implementation of an estimator-based controller which uses the feedback from an on-off zirconia exhaust oxygen sensor of the type currently used in production vehicles. The limit-cycle associated with the on-off oxygen sensor in conventional systems is eliminated with the estimator-based control structure. Furthermore, the in-cylinder air-fuel ratio tracks the commanded value, so that if a limit cycle is desired in some areas of the engine's operating range for better catalyst operation, its amplitude and frequency can be set arbitrarily

Notes:

Vendor supplied data

Publisher Number:

940972

Access Restriction:

Restricted for use by site license