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US 12,234,784 B1Granted
Methods and systems for verifying oxygen sensor connections
AssigneeFord Global Technologies, LLC
InventorsRani Kiwan, Chris Paul Glugla, Michael Uhrich
Life of this patent
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Abstract
Systems and methods for detecting and compensating miswiring of oxygen sensors of a cylinder bank of an engine are disclosed. In one example, fuel control parameters are monitored to determine whether or not the fuel control parameters diverge to fuel control thresholds. If so, a controller may switch which cylinder's equivalence ratios are adjusted in response to output of a particular oxygen sensor.
Claims20
A method for operating an engine, the method comprising:
- monitoring exhaust gases of a first group of cylinders of a first cylinder bank of the engine via a first oxygen sensor associated with the first group of cylinders;
- monitoring exhaust gases of a second group of cylinders of the first cylinder bank via a second oxygen sensor associated with the second group of cylinders;
- determining whether a miswiring of at least one of the first oxygen sensor and the second oxygen sensor has occurred in response to an output from the first oxygen sensor or an output from the second oxygen sensor;
- switching association of the first oxygen sensor from the first group of cylinders to the second group of cylinders and switching association of the second oxygen sensor from the second group of cylinders to the first group of cylinders when the miswiring is determined to have occurred;
- and
- injecting fuel to the engine in response to the output of the first oxygen sensor and the output of the second oxygen sensor with the switched associations.
3 more elements
An internal combustion engine system, comprising:
- a first cylinder bank including a first pair of cylinders and a second pair of cylinders;
- a first oxygen sensor positioned downstream of the first pair of cylinders, and a second oxygen sensor positioned downstream of the second pair of cylinders;
- a second cylinder bank including a third pair of cylinders and a fourth pair of cylinders;
- a third oxygen sensor positioned downstream of the third pair of cylinders, and a fourth oxygen sensor positioned downstream of the fourth pair of cylinders;
- at least one fuel injector associated with each cylinder;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to:
- determine whether a first miswiring of at least one of the first oxygen sensor and the second oxygen sensor has occurred in response to an output from the first oxygen sensor or an output of the second oxygen sensor,
- switch association of the first oxygen sensor from the first pair of cylinders to the second pair of cylinders and switch association of the second oxygen sensor from the second pair of cylinders to the first pair of cylinders when the first miswiring is determined to have occurred, and
- adjust fuel injection to the first cylinder bank in response to the output of the first oxygen sensor and the output of the second oxygen sensor with the switched associations.
7 more elements
A method for operating an engine, comprising:
- operating the engine in a fuel cut-off mode;
- commanding a first group of cylinders of a first cylinder bank of the engine to a first air-fuel ratio and commanding a second group of cylinders of the first cylinder bank to a second air-fuel ratio in response to an exiting of the fuel cut-off mode;
- monitoring exhaust gases of the first group of cylinders via a first oxygen sensor associated with the first group of cylinders;
- monitoring exhaust gases of the second group of cylinders via a second oxygen sensor associated with the second group of cylinders;
- determining a miswiring of the first oxygen sensor and the second oxygen sensor has occurred in response to the first oxygen sensor indicating the first group of cylinders is operating at the second air-fuel ratio;
- switching association of the first oxygen sensor from the first group of cylinders to the second group of cylinders and switching association of the second oxygen sensor from the second group of cylinders to the first group of cylinders when the miswiring is determined to have occurred;
- and
- injecting fuel to the engine in response to an output of the first oxygen sensor and an output of the second oxygen sensor with the switched associations.
5 more elements
Dependencies are inferred from the claim text.