Method and systems for exhaust gas recirculation system diagnosis
AssigneeGeneral Electric Company
InventorsMilan Palinda Karunaratne, Benedict George Lander, Chirag Bipinchandra Parikh
Life of this patent
Estimating the term…
Abstract
Various methods and systems are provided for diagnosing a condition of a component in an exhaust gas recirculation system. In one example, a method includes selectively routing exhaust from a first subset of engine cylinders to an exhaust passage via a first valve and to an intake passage via a second valve and determining a respective condition of each of the first valve and second valve based on a first exhaust pressure of the first subset of engine cylinders and a second exhaust pressure of a second subset of engine cylinders.
Claims14
A method for an engine, comprising:
- selectively routing exhaust from a first subset of engine cylinders to an exhaust passage via a first valve and to an intake passage via a second valve;
- determining a respective condition of each of the first valve and second valve based on a first exhaust pressure of the first subset of engine cylinders and a second exhaust pressure of a second subset of engine cylinders, a difference between the first exhaust pressure and the second exhaust pressure, and a change in one or more of the first exhaust pressure or the second exhaust pressure;
- and
- indicating valve degradation based on the difference between the first exhaust pressure and the second exhaust pressure increasing above a threshold difference, the threshold difference based on a pressure difference during non-degraded valve operation.
A method, comprising:
- selectively routing exhaust from a first subset of engine cylinders of an engine to an exhaust passage via a first valve and to an intake passage via a second valve while routing exhaust from a second subset of engine cylinders to the exhaust passage;
- indicating degradation of the first valve based on a first exhaust pressure of the first subset of engine cylinders and a second exhaust pressure of the second subset of engine cylinders when the second exhaust pressure is changing more than the first exhaust pressure;
- and
- indicating degradation of the second valve based on the first exhaust pressure and the second exhaust pressure when the first exhaust pressure is changing more than the second exhaust pressure, wherein indicating degradation of the first valve includes indicating degradation when a difference between the first exhaust pressure and the second exhaust pressure is greater than a first threshold difference and the second exhaust pressure is decreasing while the first exhaust pressure is maintained within a threshold of an average value.
A method, comprising:
- selectively routing exhaust from a first subset of engine cylinders of an engine to an exhaust passage via a first valve and to an intake passage via a second valve while routing exhaust from a second subset of engine cylinders to the exhaust passage;
- indicating degradation of the first valve based on a first exhaust pressure of the first subset of engine cylinders and a second exhaust pressure of the second subset of engine cylinders when the second exhaust pressure is changing more than the first exhaust pressure;
- and
- indicating degradation of the second valve based on the first exhaust pressure and the second exhaust pressure when the first exhaust pressure is changing more than the second exhaust pressure, wherein indicating degradation of the first valve or the second valve includes alerting a vehicle operator that the first valve or the second valve is degraded and further comprising actuating the first valve or the second valve to attempt to un-stick the first valve or the second valve.
Dependencies are inferred from the claim text.