Temperature-controlled PCV valve
View Patent ↗A positive crankcase ventilation valve includes a flow restrictor movable in an orifice to vary flow of fumes from a crankcase to an intake manifold in a vehicle.
1. A positive crankcase ventilation PCV valve for use with a vehicle engine having a throttle valve movable between an idle position and a wide-open position, the PCV valve comprising
a valve housing shell formed to include an interior region, an inlet opening into the interior region, and an outlet opening into the interior region,
a flow regulator including a deformable orifice plate being arranged to lie in the interior region of the valve housing shell to partition the interior region into an inlet chamber coupled to the inlet and adapted to be coupled to a crankcase of a vehicle and an outlet chamber coupled to the outlet and adapted to be coupled to an engine intake manifold of a vehicle, the deformable orifice plate being formed to include a variable-size flow-metering orifice and made of a deformable material to cause the variable-size flow-metering orifice to have a first effective size upon deformation of the deformable orifice plate to assume a first shape and a relatively larger second effective size upon deformation of the deformable orifice plate to assume a second shape, and
a flow restrictor located in the interior region of the valve housing shell and arranged to extend into the variable-size flow-metering orifice formed in the deformable orifice plate to define a variable flow-metering channel therebetween, the flow restrictor being mounted for movement in the variable-size flow-metering orifice to vary an effective size of the variable flow-metering channel between (1) a low-vacuum position supported on a restrictor platform included in the valve housing shell to extend through the variable-size flow-metering orifice in response to exposure of the flow restrictor to a low-level vacuum extant in the outlet chamber when the throttle valve has been moved to the wide-open position and located to establish a first effective size of the variable flow-metering channel upon deformation of the deformable orifice plate to assume the first shape and to establish a second effective size of the variable flow-metering channel upon deformation of the deformable orifice plate to assume the second shape and (2) a high-vacuum position located away from and unsupported by the restrictor platform to extend through the variable-size flow-metering orifice in response to exposure of the flow restrictor to a high-level vacuum extant in the outlet chamber that is greater than the low-level vacuum when the throttle valve has been moved to the idle position and to establish a third effective size of the variable flow-metering channel upon deformation of the deformable orifice plate to assume the first shape and to establish a fourth effective size of the variable flow-metering channel upon deformation of the deformable orifice plate to assume the second shape, and wherein each of the first, second, third, and fourth effective sizes of the variable flow-metering channel is different from one another to regulate flow of crankcase fumes passing therethrough as a function of deformable orifice plate shape and outlet chamber vacuum magnitude.
2. The PCV valve of claim 1 , wherein the deformable orifice plate includes a rim and a plurality of fins coupled to the rim and arranged to define the variable-size flow-metering orifice therebetween.
3. The PCV valve of claim 2 , wherein the fins are made of a temperature-activated material and configured to expand and move relative to the rim to establish the first shape of the deformable orifice plate when heated to a predetermined transitional temperature in response to exposure to high-temperature fuel vapor admitted into the interior region of the valve housing shell through the inlet and to contract and move relative to the rim to establish the second shape of the deformable orifice plate when cooled in response to exposure to a low-temperature fuel vapor that has a temperature that is less than the predetermined transitional temperature and is admitted into the interior region of the valve housing shell through the inlet.
4. The PCV valve of claim 3 , wherein the first shape of the deformable orifice plate is a substantially flat shape and the second shape is a substantially frustoconical shape.
5. The PCV valve of claim 3 , wherein the flow restrictor includes a base adapted to engage the platform upon movement of the flow restrictor to assume the low-vacuum position and an upright pintle arranged to extend upwardly from the base and into the variable-size flow-metering orifice formed in the deformable orifice plate and wherein the flow regulator further includes a plate support arranged to engage the base of the flow restrictor and the rim of the deformable orifice plate and configured to support the deformable orifice plate normally in a predetermined position relative to the flow restrictor to cause the upright pintle to extend into the variable-shape flow-metering orifice and cooperate with the deformable orifice plate to define the variable flow-metering channel.
6. The PCV valve of claim 5 , wherein the plate support is a compression spring configured to lie in a coil and wind around and in spaced-apart relation to a portion of the upright pintle.
7. The PCV valve of claim 5 , wherein the pintle includes at least two differently sized control portions located between the base and the outlet of the valve housing shell and arranged to extend into the variable-size flow-metering orifice in response to movement of the base toward and away from the restrictor platform and wherein the base and the restrictor platform cooperate to define an empty space therebetween in response to movement of the flow restrictor to the high-vacuum position.
8. The PCV valve of claim 2 , wherein the deformable orifice plate is monolithic and made of a temperature-activated material and wherein the fins are configured to move relative to one another and to the rim when exposed to changing temperature to vary the size of the variable-size flow-metering orifice defined between the fins.
9. The PCV valve of claim 8 , wherein the first shape of the deformable orifice plate is a substantially flat shape and the second shape is a substantially frustoconical shape.
10. The PCV valve of claim 8 , wherein the flow regulator further includes a plate support located in the interior region of the valve housing shell and coupled to the rim of the deformable orifice plate and a portion of the flow restrictor.
11. The PCV valve of claim 10 , wherein the plate support is a compression spring configured to yield in response to changing pressure conditions in the interior region of the valve housing shell to change the elevation of the deformable orifice plate relative to the flow restrictor.
12. The PCV valve of claim 10 , wherein the flow restrictor includes a base and an upright pintle coupled to the base and arranged to extend through the variable-size flow-metering orifice and the plate support is coupled to and interposed between the rim of the deformable orifice plate and the base of the flow restrictor.
13. The PCV valve of claim 1 , wherein the deformable orifice plate is made of a temperature-activated material and configured to deform when exposed to changing temperature of crankcase fumes flowing through the interior region of the valve housing shell to change the effective size of the variable-size flow-metering orifice formed in the deformable orifice plate.
14. The PCV valve of claim 13 , wherein the deformable orifice plate includes an outer rim and radially inwardly extending fins cantilevered to an inner edge of the outer rim, the variable-size flow-metering orifice is defined by space provided between the fins, and the effective size of the variable-size flow-metering orifice changes as the fins move relative to the outer rim and to one another as the temperature of crankcase fumes flowing around and over the fins changes.
15. The PCV valve of claim 14 , wherein the flow regulator further includes a plate support located in the interior region of the valve housing shell and coupled to the rim of the deformable orifice plate and a portion of the flow restrictor.
16. The PCV valve of claim 15 , wherein the plate support is a compression spring configured to yield in response to changing pressure conditions in the interior region of the valve housing shell to change the elevation of the deformable orifice plate relative to the flow restrictor in the interior region of the valve housing shell and relative to the platform.
17. The PCV valve of claim 13 , wherein the flow regulator further includes a plate support located in the interior region of the valve housing shell and interposed between the deformable orifice plate and a base of the flow restrictor and wherein the flow restrictor further includes an upright pintle coupled to the base and arranged to extend upwardly from the base into the variable-size flow-metering orifice formed in the deformable orifice plate.
18. The PCV valve of claim 17 , wherein the plate support is a compression spring configured to yield in response to changing pressure conditions in the interior region of the valve housing shell to change the elevation of the deformable orifice plate relative to the flow restrictor in the interior region of the valve housing shell and relative to the platform.
19. The PCV valve of claim 17 , wherein the plate support is a compression spring configured to lie in a coil and wind around and in spaced-apart relation to a portion of the upright pintle.
20. The PCV valve of claim 13 , wherein the first shape of the deformable orifice plate is a substantially flat shape and the second shape is a substantially frustoconical shape.
21. A positive crankcase ventilation PCV valve for use with a vehicle engine having a throttle valve movable between an idle position and a wide-open position, the PCV valve comprising
a valve housing shell formed to include an interior region, an inlet opening into the interior region, and an outlet opening into the interior region,
a restrictor platform included in the valve housing shell and located in the interior region,
a deformable orifice plate located in the interior region and formed to include a variable-size flow-metering orifice,
a flow restrictor arranged to rest normally in the interior region on the restrictor platform and extend into the variable-size flow-metering orifice formed in the deformable orifice plate to define a variable flow-metering channel therebeween, and
a plate support located in the interior region and arranged to support the deformable orifice plate in more than one position relative to the flow restrictor.
22. The PCV valve of claim 21 , wherein the deformable orifice plate is made of a temperature-activated material and configured to deform when exposed to changing temperature of crankcase fumes flowing through the interior region of the valve housing shell to change the effective size of the variable-size flow-metering orifice formed in the deformable orifice plate.
23. The PCV valve of claim 21 , wherein the deformable orifice plate is configured to expand to establish a substantially flat shape when heated to a predetermined transitional temperature and to contract to establish a substantially frustoconical shape when cooled to a temperature below the predetermined transitional temperature.
24. The PCV valve of claim 22 , wherein the deformable orifice plate includes an outer rim and radially inwardly extending fins cantilevered to an inner edge of the outer rim, the variable-size flow-metering orifice is defined by space provided between the fins, and the effective size of the variable-size flow-metering orifice changes as the fins move relative to the outer rim and to one another as the temperature of crankcase fumes flowing around and over the fins changes.
25. The PCV valve of claim 24 , wherein the plate support is coupled to the rim of the deformable orifice plate and a portion of the flow restrictor.
26. The PCV valve of claim 24 , wherein the flow regulator further includes a plate support located in the interior region of the valve housing shell and interposed between the deformable orifice plate and a base of the flow restrictor and wherein the flow restrictor further includes an upright pintle coupled to the base and arranged to extend upwardly from the base into the variable-size flow-metering orifice formed in the deformable orifice plate.
27. The PCV valve of claim 21 , wherein the deformable orifice plate includes a rim and a plurality of fins coupled to the rim and arranged to define the variable-size flow-metering orifice therebetween.
28. The PCV valve of claim 27 , wherein the deformable orifice plate is monolithic and made of a temperature-activated material and wherein the fins are configured to move relative to one another and to the rim when exposed to changing temperature to vary the size of the variable-size flow-metering orifice defined between the fins.
29. A positive crankcase ventilation PCV valve for use with a vehicle engine having a throttle valve movable between an idle position and a wide-open position, the PCV valve comprising
a valve housing shell formed to include an interior region, an inlet opening into the interior region, and an outlet opening into the interior region,
a flow regulator including a deformable orifice plate and a plate support coupled to the deformable orifice plate, the deformable orifice plate being formed to include a variable-size flow-metering orifice that varies in size as a result of deformation of the deformable orifice plate, and
a flow restrictor including a pintle that extends upwardly through the variable-size flow-metering orifice and a base underlying the pintle, wherein the plate support is coupled to the base to elevate the deformable orifice plate above the base and wherein the deformable orifice plate is made of a temperature-activated material and is configured to change shape when exposed to changing temperatures of crankcase fumes passing through the valve housing shell to change the effective size of the variable-size flow-metering orifice.
30. The PCV valve of claim 29 , wherein the deformable orifice plate includes a rim and a plurality of fins coupled to the rim and arranged to define the variable-size flow-metering orifice therebetween.
31. The PCV valve of claim 30 , wherein the fins are made of a temperature-activated material and configured to expand to establish a first shape of the deformable orifice plate providing one effective size of the variable-size flow-metering orifice when heated to a predetermined transitional temperature in response to exposure to high-temperature fuel vapor admitted into the interior region of the valve housing shell through the inlet and to contract to establish a second shape of the deformable orifice plate providing another effective size of the variable-size flow-metering orifice when cooled in response to exposure to a low-temperature fuel vapor that has a temperature that is less than the predetermined transitional temperature and is admitted into the interior region of the valve housing shell through the inlet.
32. The PCV valve of claim 31 , wherein the first shape of the deformable orifice plate is a substantially flat shape and the second shape is a substantially frustoconical shape.
33. The PCV valve of claim 29 , wherein the plate support is a compression spring configured to lie in a coil and wind around and in spaced-apart relation to a portion of the pintle.
34. The PCV valve of claim 29 , wherein the plate support is a compression spring configured to yield in response to changing pressure conditions in the interior region of the valve housing shell to change the elevation of the deformable orifice plate relative to the flow restrictor.
35. The PCV valve of claim 29 , wherein the deformable orifice plate includes an outer rim and radially inwardly extending fins cantilevered to an inner edge of the outer rim, the variable-size flow-metering orifice is defined by space provided between the fins, and the effective size of the variable-size flow-metering orifice changes as the fins move relative to the outer rim and to one another as the temperature of crankcase fumes flowing around and over the fins changes.