Method and system for an aspirator for a brake booster

Patent metadata

Field	Value
Publication number	US-9981643-B2
Application number	US-201715693791-A
Country	US
Kind code	B2
Filing date	Sep 1, 2017
Priority date	Nov 13, 2015
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

Methods and systems are provided for providing vacuum to a brake booster via an aspirator system. In one example, a system may include an aspirator system fluidly coupled with a brake booster with no intervening components located therebetween.

First claim

The invention claimed is:

1. An aspirator system, comprising:
a volute shaped aspirator with a linear aspirator protruding through a spiral of the volute aspirator, the linear aspirator comprising a venturi passage fluidly coupled to a brake booster, and where the aspirators are fluidly coupled to front or rear grills via a conical aspirator with no other intervening components located therebetween.

2. The aspirator system of claim 1 , wherein the conical aspirator is the furthest downstream and the linear aspirator is the furthest upstream of the aspirators.

3. The aspirator system of claim 1 , further comprising a check valve located in a passage fluidly coupling the brake booster to the venturi passage.

4. The aspirator system of claim 3 , wherein the check valve opens in response to a vacuum of the brake booster being less than a minimum threshold vacuum.

5. The aspirator system of claim 1 , wherein the volute shaped aspirator and the linear aspirator further comprise inlets for receiving motive air flow from the front grill.

6. The aspirator system of claim 5 , wherein the inlets are located downstream of fans.

7. The aspirator system of claim 1 , wherein the aspirators generate vacuum during vehicle speeds greater than a threshold speed.

8. A system comprising:
an engine with one or more cooling fans;
an aspirator system with at least one inlet downstream of and in fluid communication with the one or more cooling fans;
first, second, and third aspirator portions of the aspirator system fluidly coupled and capable of receiving motive flow from a front grill and expelling the motive flow out through a rear grill; and
a brake booster comprising a passage with a check valve fluidly coupled with the first aspirator portion with no other intervening components located therebetween.

9. The system of claim 8 , wherein the first aspirator portion is a venturi passage.

10. The system of claim 8 , wherein the second aspirator portion is a volute shape, and where the first aspirator portion extends through a spiral of the second aspirator portion.

11. The system of claim 8 , wherein the third aspirator portion is a cone shape with an outlet located between outer and inner walls of the third aspirator portion, where the outlet is an annular shape, and where a space between the outer and inner walls decreases toward the rear grill.

12. The system of claim 8 , further comprising a connecting passage fluidly coupling the first and second aspirator portions to the third aspirator portion.

13. The system of claim 8 , wherein the first aspirator portion receives suck flow from the brake booster when the check valve is open and flows a mixture of the suck flow and the motive flow toward the rear grill.

14. The system of claim 8 , wherein a first aspirator portion outlet flow is linearly shaped and second and third aspirator portion outlet flows are annularly shaped.

15. The system of claim 8 , wherein the check valve is spring loaded with a predetermined tension based on a minimum threshold vacuum.

16. The system of claim 8 , wherein the check valve is not electrically actuated.

Assignees

• Ford Global Tech Llc

Inventors

• Zhang Xiaogang
• Vanderwege Brad Alan
• Ulrey Joseph Norman

Classifications

• F02M35/104

  Intake manifolds · CPC title

• B60T13/52 Primary

  indirect, i.e. vacuum booster units · CPC title

• B60T17/02

  Arrangements of pumps or compressors, or control devices therefor · CPC title

• B60T13/72

  in vacuum systems {or vacuum booster units} · CPC title

• B60T13/57

  characterised by constructional features of control valves · CPC title