FLUID PRESSURE SENSING METHOD AND APPARATUS

• US 20080110267A1
• Filed: 10/13/2006
• Published: 05/15/2008
• Est. Priority Date: 10/13/2006
• Status: Active Grant

• Current Assignee: Bendix Commercial Vehicle Systems LLC (Estate of Heinz Hermann Thiele)
• Original Assignee: Bendix CVS Canada Inc. (Estate of Heinz Hermann Thiele)
• Inventors: Patterson, Robert Gordon, Lammers, Shawn, Sheikh-Bahaie, Kian
• Granted Patent: US 7,421,902 B2
• Time in Patent Office: Days
• US Class Current: 73/700
• CPC Class Codes: B60C 23/0408 transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
• CPC Class Codes: B60C 23/0496 Valve stem attachments positioned outside of the tyre chamber
• CPC Class Codes: G01L 19/086 for remote indication

Abstract

A method and apparatus for producing a circuit carrier for mounting components of a pressure sensing circuit, circuit carrier formed thereby, an apparatus for housing a pressure sensor circuit carrier to form a pressure sensing apparatus and a pressure sensing system using the pressure sensing apparatus and a coupler for coupling the pressure sensing apparatus to a pressurized system. A housing has provisions for aligning and urging a circuit carrier to sealingly position a pressure sensor adjacent an opening in a wall extending through of housing. The wall defines a pressure sensing chamber operable to cooperate with a pressure coupler having a profile that sealingly engages the wall.

Claims

1. A method of producing a circuit carrier for mounting components of a pressure sensing circuit, the method comprising:

forming on a substrate a circuit portion and an antenna portion,

wherein forming said antenna portion comprises forming a radio frequency antenna on said antenna portion; and

wherein forming said circuit portion comprises;

causing at least one power supply mount for a power supply for the pressure sensing circuit to be formed at a side of said substrate such that the power supply projects outwardly from said substrate;

causing a pressure sensor mount to be formed on said substrate such that when a pressure sensor is mounted to said mount a flat surface about a sensor opening of the pressure sensor is generally parallel and spaced apart from a first surface of said substrate and is adjacent the power supply;

causing ancillary component mounts to be formed in said circuit portion, said ancillary component mounts being operable to facilitate mounting of ancillary components for effecting a transmitter function; and

causing circuit interconnections between said at least one power supply mount, said pressure sensor mount and said ancillary component mounts and said antenna to be formed on said substrate such that a pressure sensor mounted to said pressure sensor mount and ancillary components mounted to said ancillary component mounts and are operable to receive power from a power supply mounted to said power supply mount and such that when the pressure sensor and ancillary components receive power from the power supply the transmitter function is effected, the transmitter function being operable to produce a transmittable signal in response to a pressure signal received from the pressure sensor, the transmittable signal being operable to be radiated by said antenna, for wireless reception by a remote receiver.

2. The method of claim 1 wherein said power supply mount includes a battery mount.

3. The method of claim 2 wherein said battery mount includes first and second battery mounts on opposite sides of said substrate, said pressure sensor mount being located between said first and second battery mounts.

4. The method of claim 3 wherein said first and second battery mounts are operably configured to facilitate mounting of disk-shaped batteries such that axes of said disk shaped batteries are generally parallel to a top surface of said substrate.

5. The method of claim 1 wherein forming said circuit portion and said antenna portion comprises causing said circuit portion to be located on a first end of said substrate and causing said antenna portion to be located on a second end of said substrate.

6. The method of claim 5 wherein forming said antenna portion comprises forming a serpentine conductor on said second end of said substrate.

7. The method of claim 1 wherein causing said ancillary component mounts to be formed in said circuit portion comprises causing switch contacts to be formed on said substrate, for mounting a switch thereto, and wherein causing said circuit interconnections to be formed on said substrate comprises causing said circuit interconnections to connect said switch contacts to at least one of said ancillary component mounts, said power supply mount and said pressure sensor mount.

8. The method of claim 7 wherein causing said switch contacts to be formed on said substrate comprises causing said switch contacts to be formed on a second surface of said substrate, wherein said second surface is generally parallel and spaced apart from said first surface.

9. A method of producing a pressure sensor circuit assembly comprising installing a power supply on said power supply mount of the circuit carrier of claim 1, installing a pressure sensor on said pressure sensor mount of the circuit carrier of claim 1 and, installing ancillary components on said ancillary component mounts of the circuit carrier of claim 1, such that said ancillary components are operable to effect the transmitter function.

10. A method of housing the pressure sensor circuit assembly of claim 9, the method comprising:

receiving said circuit portion in a cavity of a body having a wall defining a pressure sensing chamber such that said opening in said pressure sensor is aligned with an opening in said pressure sensing chamber; and

urging said substrate in a direction tending to press said flat surface of said pressure sensor against a seal between said flat surface and a portion of said wall defining said pressure sensing chamber, such that said sensor opening of the pressure sensor is in fluid communication with said opening in said pressure sensing chamber and such that said seal prevents ambient pressure from interfering with communication of fluid between said sensor opening of the pressure sensor and said opening in said pressure sensing chamber.

11. The method of claim 10 wherein receiving comprises aligning said sensor opening of the pressure sensor with said opening in said pressure sensing chamber.

12. The method of claim 11 wherein aligning comprises guiding said circuit assembly into a position relative to said pressure chamber such that said sensor opening of the pressure sensor is aligned with said opening in said pressure sensing chamber.

13. The method of claim 12 wherein guiding comprises confining lateral movement of said circuit assembly.

14. The method of claim 12 wherein guiding comprises guiding edges on opposite sides of said substrate to position said substrate relative to said pressure sensing chamber while said substrate is moved into said cavity.

15. The method of claim 10 wherein urging comprises applying a force to a second surface of said substrate, said second surface being opposite said first surface.

16. The method of claim 15 wherein applying said force comprises causing said second surface of said substrate to bear upon a support in said cavity.

17. The method of claim 16 wherein causing said second surface of said substrate to bear upon said support comprises causing said second surface to bear upon first and second spaced apart supports.

18. The method of claim 15 further comprising holding a switch actuator adjacent switch contacts formed on said substrate.

19. The method of claim 18 wherein holding comprises receiving said switch actuator in an opening in said wall.

20. The method of claim 19 wherein holding comprises fastening a holder to said wall such that a surface of said switch actuator is accessible from outside said body.

21. A circuit carrier apparatus for a fluid pressure sensor, the apparatus comprising:

a substrate having first and second opposite edges, first and second opposite ends and first and second opposite facing surfaces;

a circuit portion on said first end and an antenna portion on said second end,

wherein said antenna portion comprises a radio frequency antenna; and

wherein said circuit portion comprises;

at least one power supply mount for a power supply for a pressure sensing circuit, said power supply mount being located at a side of said substrate and such that the power supply projects outwardly from said substrate;

a pressure sensor mount formed on said substrate such that when a pressure sensor is mounted to said mount, a flat surface about a sensor opening on the pressure sensor is generally parallel and spaced apart from the first opposite facing surface and is adjacent the power supply;

ancillary component mounts formed in said circuit portion, said ancillary component mounts being operable to facilitate mounting of ancillary components for effecting a transmitter function; and

circuit interconnections between said at least one power supply mount, said pressure sensor mount and said ancillary component mounts and said antenna such that a pressure sensor mounted to said pressure sensor mount and ancillary components mounted to said ancillary component mounts are operable to receive power from a power supply mounted to said power supply mount and such that when the pressure sensor and ancillary components receive power from the power supply a transmitter function is effected, the transmitter function being operable to produce a transmittable signal in response to a pressure signal received from the pressure sensor, the transmittable signal being operable to be radiated by said antenna, for wireless reception by a remote receiver.

22. The apparatus of claim 21 wherein said power supply mount includes a battery mount.

23. The apparatus of claim 22 wherein said battery mount includes first and second battery mounts on opposite sides of said substrate, said pressure sensor mount being located between said first and second battery mounts.

24. The apparatus of claim 23 wherein said first and second battery mounts are operably configured to facilitate mounting of disk-shaped batteries such that axes of said disk shaped batteries are generally parallel to a top surface of said substrate.

25. The apparatus of claim 21 wherein said antenna portion comprises a serpentine conductor on said second opposite end of said substrate.

26. The apparatus of claim 21 further comprising switch contacts formed on said substrate, for cooperating with a switch contactor, said switch contacts being connected by said circuit interconnections to at least one of said ancillary component mounts, said power supply mount and said pressure sensor mount.

27. The apparatus of claim 26 wherein said switch contacts are formed on said second opposite facing surface of said substrate.

28. A pressure sensor circuit apparatus comprising the circuit carrier of claim 21 and further comprising:

a power supply installed on said power supply mount;

a pressure sensor installed on said pressure sensor mount

ancillary components installed on said ancillary component mounts, such that said ancillary components are operable to effect the transmitter function.

29. An apparatus for housing a pressure sensor circuit, the apparatus comprising:

a body having;

an outer wall defining a cavity operably configured to hold a substrate carrying a pressure sensor having a pressure sensing opening;

an inner wall inside said cavity defining a pressure sensing chamber;

an opening in said inner wall;

a seal interface about said opening;

aligning means for aligning said pressure sensor opening with said opening in said inner wall to provide for communication of fluid between said pressure sensing chamber and said pressure sensing opening; and

urging means for urging said pressure sensor against a seal adjacent said seal interface, such that said pressure sensing opening is in fluid communication with said opening in said inner wall and such that the seal prevents ambient pressure from interfering with communication of fluid between said pressure sensing opening and said opening in said inner wall.

30. The apparatus of claim 29 wherein said aligning means comprises guiding means for guiding said substrate into a position in which said pressure sensing opening is aligned with said opening in said inner wall.

31. The apparatus of claim 30 wherein said guiding means comprises stops operable to contact first and second sides of said substrate for confining lateral movement of said pressure sensor circuit.

32. The apparatus of claim 31 wherein said first and second sides of said substrate have first and second edges respectively, and wherein said stops include first and second stops operably configured to bear upon said first and second edges to laterally position said substrate relative to said inner wall.

33. The apparatus of claim 29 wherein said urging means comprises means for applying a force on a surface of said substrate.

34. The apparatus of claim 33 wherein said means for applying a force comprises a support on said outer wall of said body and facing inside said cavity, wherein said surface of said substrate bears upon said support.

35. The apparatus of claim 34 wherein said support comprises first and second spaced apart supports on said outer wall and facing into said cavity, wherein said surface of said substrate bears upon said first and second supports.

36. The apparatus of claim 29 further comprising holding means for holding a switch actuator in said outer wall such that the switch actuator is operable to make contact with switch contacts formed on said surface of said substrate.

37. The apparatus of claim 36 wherein said holding means includes a switch opening and wherein said switch opening is operable to receive the switch actuator.

38. The apparatus of claim 37 wherein said holding means further comprises a flat member having an opening permitting access to a surface of said switch actuator said flat member being fastened to said body such that said switch actuator provides a seal to prevent ingress and egress of fluid relative to said cavity through said switch actuator opening.

39. A pressure sensor apparatus comprising:

a) a circuit carrier apparatus comprising;

a substrate having first and second opposite edges, first and second opposite ends and first and second opposite facing surfaces;

a circuit portion on said first opposite end and an antenna portion on said second opposite end,

wherein said antenna portion comprises a radio frequency antenna; and

wherein said circuit portion comprises;

at least one power supply located at a side of said substrate and such that the power supply projects outwardly from said substrate;

a pressure sensor having a flat surface and a pressure sensor opening on said flat surface, said flat surface being generally parallel and spaced apart from the first opposite facing surface and adjacent the power supply;

a transmitter connected to said pressure sensor and said antenna for producing a signal for radiation by said antenna in response to a sense signal produced by said pressure sensor;

b) a housing for housing said circuit carrier apparatus, said housing comprising;

a body having;

an outer wall defining a cavity operably configured to hold the circuit portion of said substrate;

an inner wall inside said cavity defining a pressure sensing chamber;

an opening in said inner wall;

a seal about said opening in said inner wall;

aligning means for aligning said pressure sensor opening with said opening in said inner wall to provide for communication of fluid between said pressure sensing chamber and said pressure sensor opening; and

urging means for urging said pressure sensor against said seal, such that said pressure sensor opening is in fluid communication with said opening in said inner wall and such that said seal prevents ambient pressure from interfering with communication of fluid between said opening in said pressure sensor opening and said opening in said inner wall;

potting material in said cavity and about said circuit portion for securing said substrate in said cavity; and

a cover for covering said antenna portion, said cover being sealingly engaged with said housing to prevent ingress and egress of fluid relative to said cavity.

40. The apparatus of claim 39 wherein said inner wall defines a first opening into said pressure sensing chamber, said first opening being operable to receive a pressure coupling for coupling fluid pressure from a pressurized system to said pressure sensing chamber.

41. The apparatus of claim 40 wherein said outer wall defines a second opening into said pressure sensing chamber, said second opening being generally coaxial with said first opening to permit a projection on said pressure coupling to be inserted into said first opening to extend through said pressure sensing chamber such that a portion of said pressure coupling extends out of said second opening.

42. The apparatus of claim 41 wherein said aligning means comprises guiding means for guiding said substrate into said a position in which said pressure sensor opening is aligned with said opening in said inner wall.

43. The apparatus of claim 42 wherein said guiding means comprises stops operable to contact said first and second sides of said substrate for confining lateral movement of said circuit assembly.

44. The apparatus of claim 42 wherein said first and second sides of said substrate have first and second edges respectively, and wherein said stops include first and second stops operably configured to bear said first and second edges to laterally position said substrate relative to said inner wall.

45. The apparatus of claim 41 wherein said urging means comprises means for applying a force to said second opposite surface of said substrate.

46. The apparatus of claim 45 wherein said means for applying a force comprises a support on said outer wall of said body, said support facing inside said cavity, said second opposite facing surface of said substrate bearing upon said support.

47. The apparatus of claim 46 wherein said support comprises first and second spaced apart supports on said outer wall and facing into said cavity, wherein said second opposite facing surface of said substrate bears upon said support.

48. The apparatus of claim 46 wherein said circuit portion comprises switch contacts formed on said second opposite facing surface of said substrate, said switch contacts being operably connected to said pressure sensor and wherein said apparatus further comprises a switch actuator and holding means for holding said switch actuator in said outer wall such that said switch actuator is operable to make contact with said switch contacts.

49. The apparatus of claim 48 wherein said holding means includes a switch opening operably configured to hold said switch actuator.

50. The apparatus of claim 49 wherein said holding means further comprises a flat member having an opening permitting access to a surface of said switch actuator, said flat member being fastened to said body such that said switch actuator provides a sealing function to prevent ingress and egress of fluid relative to said cavity through said opening.

51. A pressure sensing system comprising the pressure sensor apparatus of claim 39 and a pressure coupler operably configured to communicate with said pressure sensing chamber to communicate fluid pressure to said pressure sensor.

52. The pressure sensing system of claim 51 wherein said pressure coupler comprises a projection having an inlet opening operably configured to communicate with a pressurized system to receive pressurized fluid therefrom, and wherein said projection and said pressure sensing chamber are operably configured such that said projection is sealingly received in said pressure sensing chamber and such that fluid entering said inlet opening is communicated to said pressure sensor through said pressure sensing chamber.