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US 2015/0147196 A1Published application
Vacuum brake booster vacuum enhancer
AssigneeFord Global Technologies, LLC
InventorsHarbind S. Chahal, Charles K. Evans, JR.
Life of this patent
Estimating the term…
Abstract
A vacuum enhancer having four apertures, one of which is open to the atmosphere, wherein a piston selectively restricts fluid flow through an ejector based on a pressure differential between a vacuum chamber within the vacuum booster and true atmospheric pressure.
Claims20
A brake booster vacuum enhancer comprising:
- a housing defining an aperture-1 connectable to a booster, an aperture-2 connectable to an intake manifold, an aperture-3 connectable to an intake air-duct, and an aperture-4 open to the atmosphere;
- a check-valve disposed between aperture-1 and aperture-2;
- an ejector disposed between aperture-2 and aperture-3;
- and
- a piston disposed between aperture-3 and aperture-4 configured to selectively restrict fluid flow through the ejector based on pressure differential between aperture-1 and aperture-4.
2 more elements
A vacuum enhancer for a brake booster comprising:
- an ejector passage capable of enhancing a vacuum in the booster via a fluid connection from an intake air-duct to an intake manifold;
- and
- a piston assembly having a first surface open to atmosphere and a second surface in fluid communication with the booster to selectively restrict fluid flow through the ejector passage at a predetermined pressure differential between the first and second surfaces.
A vacuum enhancer for an automotive vacuum brake booster comprising:
- an aperture-1 fluidly connectable to a vacuum booster;
- an aperture-2 fluidly connectable to a vacuum source and fluidly connected with aperture-1;
- an aperture-3 fluidly connectable to an engine intake air-duct proximate a filter and selectively fluidly connected with aperture-2;
- and
- an aperture-4 fluidly connected to the atmosphere.
2 more elements
Dependencies are inferred from the claim text.