Control systems and methods for air fuel imbalance and cylinder deactivation
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United States of America Patent
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Jan 23, 2018
Grant Date -
Dec 14, 2017
app pub date -
Jun 8, 2016
filing date -
Jun 8, 2016
priority date (Note) -
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Abstract
A torque request module determines a torque request for an engine based on a driver input. A cylinder control module determines a target fraction of a total number of cylinders of the engine to be activated based on the torque request. An air fuel imbalance (AFIM) module selectively commands that the cylinder control module set the target fraction based on a predetermined fraction of the total number of cylinders of the engine to be activated. The cylinder control module further: sets the target fraction based on the predetermined fraction in response to the command; and activates and deactivates opening of intake and exhaust valves of the cylinders of the engine based on the target fraction. The AFIM module further, while the target firing fraction is set based on the predetermined fraction, selectively diagnoses the presence of an AFIM fault based on samples of a signal from an oxygen sensor.
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