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US 9,518,541 B2Granted
Method and system for increasing vacuum generation by an engine
AssigneeFord Global Technologies, LLC
InventorsRoss Dykstra Pursifull, Ralph Wayne Cunningham
Life of this patent
Estimating the term…
Abstract
A method and a system for providing vacuum via an engine are described. In one example, introduction of a gaseous fuel is ceased in response to a request for the engine to provide vacuum to a vehicle vacuum system.
Claims7
A method for operating an engine, comprising:
- combusting an amount of a first fuel at an engine speed and load in absence of a vacuum request, the first fuel introduced to the engine in a gaseous state;
- and
- reducing the amount of the first fuel and increasing an amount of a second fuel introduced to the engine at the engine speed and load in response to presence of the vacuum request.
Dependencies are inferred from the claim text.