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US 11,280,280 B1Granted
Methods and systems for controlling reducing engine emissions
AssigneeFord Global Technologies, LLC
InventorsAed Dudar, Keith Weston
Life of this patent
Estimating the term…
Abstract
Systems and methods for operating an engine that includes dual throttles are disclosed. In one example, positions of the dual throttles may be adjusted to limit flow of hydrocarbons from a hydrocarbon trap during cold engine starting so that an amount of hydrocarbons that reach atmosphere may be reduced. Each of the dual throttles may be positioned in a separate engine air intake passage.
Claims15
A method for operating an engine, comprising:
- cold starting the engine with an amount of hydrocarbons stored in a first hydrocarbon trap and an amount of hydrocarbons stored in a second hydrocarbon trap;
- and
- during the cold starting, adjusting a first throttle to a first position and a second throttle to a second position via a controller in response to the amount of hydrocarbons stored in the first hydrocarbon trap and the amount of hydrocarbons stored in the second hydrocarbon trap, where the first position is more open than the second position, and wherein the amount of hydrocarbons stored in the second hydrocarbon trap is more than the amount of hydrocarbons stored in the first hydrocarbon trap.
A system, comprising:
- an internal combustion engine including a first intake passage and a second intake passage, the first intake passage including a first throttle and a first hydrocarbon trap, the second intake passage including a second throttle and a second hydrocarbon trap;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to partially open the first throttle and fully close the second throttle in response to a first amount of hydrocarbons stored in the second hydrocarbon trap greater than a first amount of hydrocarbons stored in the first hydrocarbon trap.
Dependencies are inferred from the claim text.