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US 11,873,774 B2Granted
Method and system for reactivating a catalyst
AssigneeFord Global Technologies, LLC
InventorChris Glugla
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for maintaining efficiency of a catalyst that is positioned in an exhaust system downstream of an internal combustion engine. In one example, the catalyst may be heated via supplying fuel to a cylinder that does not combust the fuel. The fuel may be oxidized at the catalyst via excess oxygen in the exhaust system.
Claims19
A method for operating an engine of a vehicle, comprising:
- operating the engine;
- and
- while the engine is running and the vehicle is approaching conditions for an automatic engine stop period, supplying a fuel to a first cylinder without combusting the fuel in the first cylinder in response to a temperature estimate of a catalyst being less than a threshold temperature at an end of the automatic engine stop period, the temperature estimate of the catalyst based on a time of the end of the automatic engine stop period.
A system for operating an engine, comprising:
- an internal combustion engine including a catalyst;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to advance exhaust valve opening timing in response to a temperature of the catalyst being less than a threshold temperature while the engine is operating in a fuel cut-off mode.
A method for operating an engine of a vehicle, comprising:
- operating an engine;
- and
- while the engine is running and the vehicle is approaching conditions for an automatic engine stop period, increasing a temperature of a catalyst in response to an estimated temperature of the catalyst, the estimated temperature of the catalyst based on a time of an end of the automatic engine stop period.
Dependencies are inferred from the claim text.