Fluidic PCV valve assembly and system

Patent metadata

Field	Value
Publication number	US-10422258-B2
Application number	US-201815933773-A
Country	US
Kind code	B2
Filing date	Mar 23, 2018
Priority date	Mar 23, 2017
Publication date	Sep 24, 2019
Grant date	Sep 24, 2019

Abstract

Provided is a PCV valve assembly that includes a fluidic geometry that allows for the flow of combustion fluid/gas to flow between an inlet and an outlet and switch between two modes of operation, (i) a radial or high flow mode, and (ii) a tangential or low flow mode, as dictated during the operation of the engine. At low vacuums, the fluidic equipped PCV valve assembly has been tuned to operate in the radial mode producing high flow rates due to low flow resistance. As vacuum increases, the PCV valve assembly is tuned to automatically switch modes. This may be enabled due to the shape of the fluidic geometry and the bypass channel which is adapted to vary the amount of flow between a first and a second control ports. The bypass channel allows the geometric fluidic pattern to switch between the high flow mode and the low flow mode.

First claim

What is claimed is:

1. A PCV valve assembly comprising:
a body defining a fluid passage comprising:
an inlet in communication with an inlet chamber including a first port, a power nozzle, and a second port;
a interaction chamber downstream of the power nozzle, said interaction chamber including a radial interaction wall and a tangential interaction wall opposite from the radial interaction wall;
a bypass channel in communication with the inlet chamber and the interaction chamber;
a swirl chamber in communication with the interaction chamber and an outlet;
wherein the assembly is configured to automatically switch between a low flow mode and a high flow mode based of fluid or gas flow through the fluid passage.

2. The PCV valve assembly of claim 1 , wherein in high flow mode, fluid or gas enters the inlet and traverses through the inlet chamber towards the interaction chamber and bypass channel towards the swirl chamber such that the fluid or gas creates a main flow, a secondary flow, and a tertiary flow.

3. The PCV valve assembly of claim 2 , wherein said main flow traverses through the power nozzle and aligns along said radial interaction wall within the interaction chamber.

4. The PCV valve assembly of claim 3 , wherein said main flow enters the swirl chamber and flows within the swirl chamber in a first direction, the secondary flow traverses through a steering chamber and enters the interaction chamber and flows within the interaction chamber in a second direction opposite from the first direction and adjacent to the main flow, the tertiary flow traverses through the steering chamber and the bypass channel and enters the swirl chamber and flows within the swirl chamber in a second direction opposite the first direction and adjacent the main flow.

5. The PCV valve assembly of claim 2 , wherein said main flow aligns along a first flow path axis as it traverses through the inlet chamber and aligns along a second flow path axis as it traverses through the interaction chamber and enters into the swirl chamber, the second flow path axis extends angularly from the first flow path axis.

6. The PCV valve assembly of claim 1 , wherein the assembly is tunable to automatically switch between the low flow mode and the high flow mode based on vacuum pressure at the inlet.

7. The PCV valve assembly of claim 1 , wherein in low flow mode, fluid or gas enters the inlet and traverses through the inlet chamber towards the interaction chamber and bypass channel towards the swirl chamber such that the fluid or gas creates a main flow and a secondary flow.

8. The PCV valve assembly of claim 7 , wherein said main flow traverses through the power nozzle and aligns along said tangential interaction wall within the interaction chamber.

9. The PCV valve assembly of claim 8 , wherein said main flow enters the swirl chamber and circulates in a second direction, the secondary flow enters the interaction chamber and flows within the interaction chamber in a first direction adjacent to the main flow.

10. The PCV valve assembly of claim 8 , wherein the main flow enters into the swirl chamber aligned along an outer wall of the swirl chamber.

11. The PCV valve assembly of claim 10 , wherein the main flow also include fluid or gas flow that traverses through the bypass channel that becomes entrained with the main flow as it enters into the swirl chamber.

12. The PCV valve assembly of claim 9 , wherein the secondary flow traverses within the interaction chamber along the radial interaction wall.

13. The PCV valve assembly of claim 1 , wherein automatic switching between the high flow mode and the low flow mode is enabled by the bypass channel which varies the flow between the first port and the second port.

14. A fluidic-equipped PCV valve flow controller comprising:
(a) an inlet chamber having an inlet lumen and defining a first or left side flow path, a second or central flow path, and a third or right side flow path;
(b) a interaction chamber having a radial interaction wall and a tangential interaction wall opposite from the radial interaction wall;
(c) a swirl chamber having an outlet lumen configured for connection to a connection tube;
(d) a steering chamber having a first or left side curved sidewall opposing a second or right side straight sidewall, the steering chamber being in fluid communication with the central flow path and the interaction chamber;
(e) a bypass channel in fluid communication with the first flow path and the swirl chamber;
wherein the controller automatically switches between a low flow mode and a high flow mode based on vacuum pressure at the inlet chamber.

15. The fluidic-equipped PCV valve flow controller of claim 14 , wherein in high flow mode, fluid or gas enters the inlet and traverses through the inlet chamber towards the interaction chamber and bypass channel towards the swirl chamber such that the fluid or gas creates a main flow, a secondary flow, and a tertiary flow.

16. The fluidic-equipped PCV valve flow controller of claim 15 , wherein said main flow enters the swirl chamber and flows within the swirl chamber in a first direction, the secondary flow traverses through said steering chamber and enters the interaction chamber and flows within the interaction chamber in a second direction opposite from the first direction and adjacent to the main flow, the tertiary flow traverses through the steering chamber and the bypass channel and enters the swirl chamber and flows within the swirl chamber in a second direction opposite the first direction and adjacent the main flow.

17. The fluidic-equipped PCV valve flow controller of claim 14 , wherein in low flow mode, fluid or gas enters the inlet and traverses through the inlet chamber towards the interaction chamber and bypass channel towards the swirl chamber such that the fluid or gas creates a main flow and a secondary flow.

18. The fluidic-equipped PCV valve flow controller of claim 17 , wherein said main flow traverses through the power nozzle and aligns along said tangential interaction wall within the interaction chamber, said main flow enters the swirl chamber and circulates in a second direction, the secondary flow enters the interaction chamber and flows within the interaction chamber in a first direction adjacent to the main flow, and the main flow enters into the swirl chamber aligned along an outer wall of the swirl chamber.

19. A method for providing enhanced PCV performance in a system comprising the method steps of:
(a) providing a PCV valve assembly with an inlet configured for connection to an engine's crankcase interior volume and an outlet configured for connection to a PCV connection/vacuum tube;
(b) providing, in that PCV valve assembly, an inlet chamber, a first port, a power nozzle, a second port, steering chamber, a bypass channel, an interaction chamber and a swirl chamber; and
(c) introducing a flow of fluid or gas at the inlet to traverse through said PCV valve assembly to said outlet.

20. The method of claim 19 , further comprising:
modifying a level of vacuum pressure at the inlet; and
switching characteristics of the flow of fluid or gas between a high flow mode and a low flow mode.

Assignees

• Dlhbowles Inc

Inventors

• Gopalan Shridhar
• Thurber Jerry

Classifications

• F01M13/023 Primary

  Control valves in suction conduit · CPC title

• F02M25/06

  adding lubricant vapours · CPC title

• F02M35/10222

  Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission · CPC title

• F01M13/0011

  Breather valves · CPC title

• G05D7/0186

  without moving parts · CPC title