Ford Global Technolgoies, LLC

John Edward Bradley

Douglas R Hamburg

Ahmed Abdelaziz Omara

Active adaptive bias for closed loop air/fuel control system

A three-way catalyst model ( ) and a method for modeling the dynamic response of a three-way catalyst that divides the catalyst response into sub-regions ( ) . A sub-model ( ) is constructed that represents each sub-region ( ) . Each sub-model ( ) is assigned unique attributes at which the sub-model is activated. The attributes are based on the system parameters and states. The states may be either continuous or discrete and define a hybrid state space. A larger or smaller number of sub-regions ( ) can be utilized based on the model's ( ) use and the accuracy desired for the model ( ).

Three-way catalyst model for an engine air-to-fuel ratio control system

A method of controlling the air-fuel ratio of an internal combustion engine having an exhaust passage including a catalytic converter. The method includes providing a first air-fuel ratio sensor upstream of the catalytic converter, and providing a second air-fuel ratio sensor downstream of the catalytic converter. A control module having an input connected to the first and second air-fuel ratio sensors and an output connected to actuators for controlling the engine is also provided. This establishes a first feedback loop including the first air-fuel ratio sensor and a second feedback loop including the second air-fuel ratio sensor. The method further includes detecting an output value of the second air-fuel ratio indicative of a rich or lean exhaust gas air-fuel ratio. In response to the output value, the system monitors the engine mass airflow, and controls the duration of air-fuel ratio of the engine as a function of the engine mass airflow.

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Dearborn, MI, United States of America

John Edward Bradley