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US 2026/0043367 A1Published application
Methods and systems to compensate for oxygen sensor bias
AssigneeFord Global Technologies, LLC
InventorsRani Kiwan, Stephen W. Magner, Chris Paul Glugla, Michael Uhrich
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Abstract
Systems and methods for controlling fuel that is supplied to cylinders of an internal combustion engine are described. In one example, oxygen sensors are placed in an exhaust system of an engine such that each oxygen sensor may detect exhaust gas from a pair of engine cylinders. The oxygen sensors may then provide feedback to coupled and decoupled fuel controllers.
Claims20
A fuel control system for an internal combustion engine, comprising:
- a first cylinder bank coupled to an exhaust system that includes a first oxygen sensor upstream of a first catalyst and a second oxygen sensor upstream of the first catalyst;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to adjust operation of a first delta fuel controller that receives output from the first oxygen sensor and the second oxygen sensor in response to a first correction value of a first outer-loop fuel controller exceeding a threshold value.
A method for operating an engine, comprising:
- via a controller, adjusting operation of an inner-loop delta fuel controller in response to an indication of oxygen sensor bias;
- and
- injecting fuel to the engine in response to output of the inner-loop delta fuel controller.
A method for operating an engine, comprising:
- via a controller, adjusting operation of an inner-loop delta fuel controller in response to an indication that a first oxygen sensor in an exhaust system is being exposed to exhaust gases that have passed by a second oxygen sensor in the exhaust system;
- and
- injecting fuel to the engine in response to output of the inner-loop delta fuel controller.
Dependencies are inferred from the claim text.