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US 2012/0237368 A1Published application
Method and System for Providing Vacuum via Excess Boost
AssigneeFord Global Technologies, LLC
InventorsRoss Dykstra Pursifull, Joseph Norman Ulrey
Life of this patent
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Abstract
A vacuum source including an ejector is disclosed. In one example, vacuum is supplied via the ejector when a turbocharger has excess boost capacity. The approach can prioritize how excess boost may be used to provide vacuum.
Claims20
A method for providing vacuum, comprising:
- supplying air from a compressor to engine cylinders, the compressor having an air output capacity;
- directing air flow from the compressor to an ejector supplying vacuum to a vacuum reservoir when the compressor has capacity to supply more air than a desired cylinder air amount, otherwise inhibiting air flow from the compressor to the ejector.
A method for providing vacuum, comprising:
- supplying air from a compressor to engine cylinders, the compressor having an air output capacity;
- directing air flow from the compressor to an ejector supplying vacuum to a vacuum reservoir when the compressor has capacity to supply more air than a desired cylinder air amount, otherwise inhibiting air flow from the compressor to the ejector;
- and
- reducing the compressor's air output capacity when the compressor has capacity to supply an air amount greater than the desired cylinder air amount and a desired ejector flow rate, otherwise not reducing the compressor's air output capacity.
1 more element
A vacuum system, comprising:
- an engine with an intake manifold;
- a turbocharger coupled to the engine and supplying air the intake manifold;
- a vacuum reservoir;
- an ejector in communication with the vacuum reservoir and the turbocharger;
- and
- a controller, the controller including instructions for, supplying air from a compressor to engine cylinders, the compressor having an output capacity;
- directing air flow from the compressor to an ejector supplying vacuum to a vacuum reservoir when the compressor has capacity to supply more air than a desired cylinder air amount, otherwise inhibiting air flow from the compressor to the ejector;
- reducing the compressor's air output capacity when the compressor has capacity to supply an air amount greater than the desired cylinder air amount and a desired ejector flow rate, otherwise not reducing the compressor's air output capacity;
- and adjusting a position of a waste gate to adjust the compressor's air output capacity.
6 more elements
Dependencies are inferred from the claim text.