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US 9,810,122 B2Granted
Engine exhaust temperature control
AssigneeFord Global Technologies, LLC
InventorsDouglas Raymond Martin, John Eric Rollinger
Life of this patent
Estimating the term…
Abstract
Methods and systems for improving operation of an engine at higher speeds and loads are disclosed. In one example, fuel may be injected to an exhaust system of the engine so that temperatures of exhaust system components may be reduced when the engine is operated at higher speeds and loads.
Claims16
An engine operating method, comprising:
- operating a Miller cycle engine with fuel injected in an exhaust system of the Miller cycle engine at a location upstream of a turbine coupled to a crankshaft of the Miller cycle engine;
- and
- passing exhaust gases from the Miller cycle engine through the turbine, where the turbine is coupled to the crankshaft via a transmission and where the turbine is coupled to the crankshaft via a turbine clutch;
- the method further comprising closing the turbine clutch in response to a temperature of an exhaust component exceeding a threshold.
1 more element
An engine operating method, comprising:
- in response to a temperature of exhaust of a Miller cycle engine being greater than an exhaust component degradation threshold temperature, injecting an amount of fuel in an exhaust system of the Miller cycle engine upstream of a turbine while operating the Miller cycle engine, the turbine arranged upstream of a catalyst in the exhaust system;
- introducing an amount of air from an intake system of the Miller cycle engine to a location in the exhaust system upstream of the turbine via a second passage;
- at the location in the exhaust system upstream of the turbine, mixing the amount of fuel injected in the exhaust system upstream of the turbine with the amount of air introduced from the intake system via the second passage;
- and
- introducing an amount of air from the intake system to a location downstream of the turbine and upstream of the catalyst via a first passage, the amount of air introduced via the first passage based on the amount of fuel injected in the exhaust system upstream of the turbine and the amount of air introduced from the intake system via the second passage.
2 more elements
An engine system, comprising:
- a Miller cycle engine having a compressor, an exhaust passage, a turbine located along the exhaust passage, a catalyst located along the exhaust passage downstream of the turbine, and a fuel injector configured to inject fuel to the exhaust passage upstream of the turbine, the Miller cycle engine further including a first passage from an intake passage to the exhaust passage at a location downstream of the turbine and upstream of the catalyst, and a second passage from the intake passage to the exhaust passage at a location upstream of the turbine;
- and
- a controller including non-transitory executable instructions to:
- flow a rich exhaust gas mixture through the turbine via adjusting an amount of fuel injected by the fuel injector and controlling air flow through the second passage;
- and
- provide a stoichiometric gas mixture downstream of the turbine and upstream of the catalyst via controlling air flow through the first passage.
3 more elements
Dependencies are inferred from the claim text.