Methods and systems for exhaust gas recirculation
AssigneeGeneral Electric Company
InventorsEric David Peters, Shashi Kiran, Nicholas Hansen
Life of this patent
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Abstract
Various methods and systems are provided for diagnosing an engine component condition in an exhaust gas recirculation system. In one example, a method includes selectively routing exhaust from a subset of engine cylinders to an exhaust passage via a first valve and to an intake passage via a second valve, and obtaining one or more of a pressure or temperature from the subset of engine cylinders. The method further includes indicating an engine component condition based on the one or more of the pressure or temperature.
Claims24
A method, comprising:
- selectively routing exhaust from only a subset of engine cylinders to an exhaust passage via a first valve and to an intake passage via a second valve;
- obtaining one or more of a pressure or a temperature of the exhaust from the subset of engine cylinders;
- and
- indicating an engine component condition based on the one or more of the pressure or temperature.
A method, comprising:
- generating first control signals for selectively routing exhaust from only a subset of cylinders of an engine to an exhaust passage of the engine and to an intake passage of the engine;
- receiving information relating to at least one of a pressure or a temperature of the exhaust;
- and
- generating second control signals for controlling the engine based on the pressure or temperature.
A method, comprising:
- selectively routing exhaust from a subset of engine cylinders to an exhaust passage via a first valve and to an intake passage via a second valve;
- during a first condition, opening the first valve more than the second valve;
- during a second condition, opening the second valve more than the first valve;
- and
- generating control signals based on one or more of exhaust pressure or exhaust temperature at a location in an exhaust manifold of the subset upstream of the first and second valves, the exhaust manifold of the subset positioned on an opposite bank of an exhaust manifold of remaining engine cylinders.
A system, comprising:
- a first valve operable to route exhaust from a subset of cylinders to an exhaust passage of an engine;
- a second valve operable to route exhaust from the subset of cylinders to an intake passage of the engine;
- and
- a temperature sensor, a pressure sensor, or both a temperature sensor and a pressure sensor disposable upstream of the first and second valves positioned in a first exhaust manifold of the subset distinct from a second manifold of remaining cylinders, and configured to measure temperature and pressure, respectively.
A system, comprising:
- an engine having a subset of donor cylinders coupled to an exhaust gas recirculation system, and further having remaining non-donor cylinders;
- a first valve configured to route exhaust from the subset of donor cylinders to an exhaust passage of the engine;
- a second valve configured to route exhaust from only the subset of donor cylinders to an intake passage of the engine;
- a temperature sensor and a pressure sensor disposed in the exhaust gas recirculation system upstream of the first and second valves and configured to measure temperature and pressure, respectively;
- and
- a control system configured to control positions of the first and second valves to selectively route portions of the exhaust to one or more of the intake passage and the exhaust passage, and to identify degradation of a component of the engine based on one or more of the temperature or pressure.
Dependencies are inferred from the claim text.