Methods and systems for operating an engine
AssigneeGeneral Electric Company
InventorsJohn Stephen Roth, Kyle Craig Stott, James Robert Mischler, Paul Flynn, Kirk Heywood, Daniel Allan Moser
Life of this patent
Estimating the term…
Abstract
Various methods and systems are provided for operating an internal combustion engine, the engine having a plurality of cylinders including one or more donor cylinders and one or more non-donor cylinders. In one example, a method includes, during an exhaust gas recirculation cooler heating mode, operating at least one of the donor cylinders at a cylinder load sufficient to increase an exhaust temperature for regenerating an exhaust gas recirculation cooler, and operating at least one of the non-donor cylinders in a low- or no-fuel mode.
Claims21
A method for operating an internal combustion engine, the engine having a plurality of cylinders including one or more donor cylinders and one or more non-donor cylinders, comprising:
- during an exhaust gas recirculation cooler heating mode:
- operating at least one of the donor cylinders at a cylinder load sufficient to increase an exhaust temperature for regenerating an exhaust gas recirculation cooler;
- and
- operating at least one of the non-donor cylinders in a low- or no-fuel mode.
A method for operating an internal combustion engine, comprising:
- in response to an engine load less than a first threshold load for a threshold duration, increasing the fuel injection quantity to one or more of a plurality of cylinders of the engine, the plurality of cylinders including one or more donor cylinders and one or more non-donor cylinders, while decreasing the fuel injection quantity to at least one of remaining cylinders of the plurality of cylinders of the engine;
- and
- in response to an effectivity of an exhaust gas recirculation cooler less than a threshold effectivity during operation in which the engine load is greater than the first threshold load and less than a second threshold load, increasing the fuel injection quantity to at least one of the donor cylinders while decreasing fuel injection to at least one of the non-donor cylinders.
A system for a vehicle, comprising:
- an internal combustion engine having a plurality of cylinders, the plurality of cylinders including one or more non-donor cylinder and one or more donor cylinder;
- an exhaust gas recirculation system including a first exhaust manifold coupled between the donor cylinders and an engine intake passage, and an exhaust gas recirculation cooler;
- a second exhaust manifold coupled to the at one or more non-donor cylinders;
- and
- a controller configured to identify an engine load, and, when the engine load is less than a first threshold load for a threshold duration, initiating a port heating mode by increasing a fuel injection quantity to at least one of the plurality of cylinders while decreasing the fuel injection quantity to at least one of the plurality of cylinders, and the controller further configured to identify an effectivity of the exhaust gas recirculation cooler, and, when the effectivity is less than a threshold effectivity while the engine load is greater than the first threshold load and less than a second threshold load, initiating an exhaust gas recirculation cooler heating mode by increasing the fuel injection quantity to at least one of the donor cylinders while decreasing the fuel injection quantity to at least one of the non-donor cylinders.
Dependencies are inferred from the claim text.