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US 11,448,108 B1Granted
System and methods for mitigating hydrocarbon breakthrough
AssigneeFord Global Technologies, LLC
InventorAed Dudar
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for mitigating hydrocarbon breakthrough from an onboard fuel vapor canister during an engine-off condition. In one example, a method may include actively routing ambient air to an exhaust catalyst to reducing a temperature of the exhaust catalyst.
Claims19
A method for an engine in a vehicle, comprising:
- during an engine-off condition, actively reducing a temperature of an exhaust catalyst by routing ambient air to an exhaust system;
- wherein the routing of air to the exhaust system is in response to a breakthrough of hydrocarbons (HCs) from a fuel vapor canister of an on-board evaporative emissions control (EVAP) system.
A method for an engine, comprising:
- in response to a hydrocarbon breakthrough during an engine-off condition, operating an engine un-fueled and/or operating an electric booster (e-booster) to route ambient air to an exhaust passage to cool an exhaust catalyst.
A system for an engine in a vehicle, comprising:
- a controller storing instructions in non-transitory memory that, when executed, cause the controller to:
- upon conditions being met for hydrocarbon breakthrough mitigation,
- operate an electric motor coupled to an intake manifold of the engine;
- open an exhaust gas recirculation (EGR) valve regulating flow through a high pressure EGR line;
- open a wastegate valve housed in a wastegate passage across an exhaust turbine;
- and
- route compressed ambient air to an exhaust catalyst coupled to an exhaust passage via the high pressure EGR line and the wastegate passage.
4 more elements
Dependencies are inferred from the claim text.