Method for reducing diesel engine emissions, and diesel engine
AssigneeMack Trucks, Inc.
InventorsJohn C. Gibble, Timothy Suder
Life of this patent
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Abstract
A method for controlling emissions during low-load diesel engine operation is provided. The engine includes at least one piston movable in a cylinder between a top dead center and a bottom dead center position, a fuel injector for injecting fuel into the cylinder, and a variable geometry turbine through which exhaust from the engine is adapted to flow. According to the method, the engine is operated at low load, NOx emissions are measured at an exhaust of the engine, and a variable geometry turbine inlet opening size is controlled responsive to NOx emissions measurements so that NOx emission levels are controlled.
Claims25
A method for controlling emissions during low-load diesel engine operation, the engine comprising at least one piston movable in a cylinder between a top dead center and a bottom dead center position, a fuel injector for injecting fuel into the cylinder, and a variable geometry turbine through which exhaust from the engine is adapted to flow, the method comprising:
- operating the engine at low load;
- and
- controlling a variable geometry turbine inlet opening size so that NOx emission levels are controlled while the engine is operated at low load.
A diesel engine comprising:
- at least one piston movable in a cylinder between a top dead center and a bottom dead center position;
- a fuel injector for injecting fuel into the cylinder;
- a variable geometry turbine through which engine exhaust is adapted to flow;
- a sensor for measuring NOx emissions at an exhaust of the engine;
- and
- a controller arranged to control a variable geometry turbine inlet opening size during low load operation of the engine responsive to NOx emissions measurements so that NOx emission levels are controlled.
Dependencies are inferred from the claim text.