Magnet orientation and calibration for small package turbocharger speed sensor

• US 7,269,992 B2
• Filed: 06/15/2005
• Issued: 09/18/2007
• Est. Priority Date: 06/15/2005
• Status: Active Grant

• Current Assignee: Sensata Technologies Incorporated (Sensata Technologies Holding Plc)
• Original Assignee: Honeywell International Inc.
• Inventors: Stolfus, Joel D., Lamb, Wayne A., Schelonka, Peter A., Frazee, Lawrence E.
• Primary Examiner(s): NOLAND, THOMAS
• Application Number:
  US11/155,203
• Publication Number:
  US 20060283232A1
• Time in Patent Office: 825 Days
• Field of Search: 73/14.1, 324/174, 324/202, 702/96, 702/FOR.150, 294/071
• US Class Current: 73/1.41
• CPC Class Codes: F02B 39/16 Other safety measures for, or other control of, pumps
• CPC Class Codes: F05B 2220/40 in turbochargers
• CPC Class Codes: G01D 11/245 Housings for sensors
• CPC Class Codes: G01D 5/147 influenced by the movement of a third element, the position of Hall device and the source of magnetic field being fixed in respect to each other
• CPC Class Codes: G01P 1/026 for speed measuring devices, e.g. pulse generator
• CPC Class Codes: G01P 3/488 delivered by variable reluctance detectors
• CPC Class Codes: Y10T 29/4978 Assisting assembly or disassembly

Abstract

A method and system for orienting and calibrating a magnet for use with a speed sensor. A magnet can be mapped two or more planes thereof in order to locate the magnet accurately relative to one or more magnetoresistive elements maintained within a speed sensor housing. An optical location of the magnet with respect to the magnetoresistive element and the sensor housing can then be identified in response to mapping of the magnet. Thereafter, the magnet can be bonded to the speed sensor housing in order to implement a speed sensor thereof maintained by the speed sensor housing for use in speed detection operations.

Claims

1. A method for orienting and calibrating a magnet for use with a speed sensor:

mapping a magnet in at least two planes thereof in order to locate said magnet accurately relative to at least one magnetoresistive element maintained within a speed sensor housing;

identifying an optimal location of said magnet with respect to said at least one magnetoresistive element and said sensor housing in response to mapping said magnet; and

thereafter bonding said magnet to said speed sensor housing in order to implement a speed sensor thereof maintained by said speed sensor housing for use in speed detection operations.

2. The method of claim 1 wherein said speed sensor housing comprises a thermoplastic package.

3. The method of claim 1 further comprising:

forming a thermoset channel from said speed sensor housing, wherein said magnet is bonded to said thermoset housing of said speed sensor housing.

4. The method of claim 1 further comprising:

integrating said speed sensor housing with a leadframe, wherein said lead frame maintains said speed sensor housing, including at least one ASIC, a plurality of bead components, and a plurality of capacitors thereof.

5. The method of claim 1 further comprising:

calibrating said speed sensor utilizing a plurality of calibration terminals integrated with said speed sensor housing.

6. The method of claim 1 further comprising:

adapting said speed sensor for use with a turbocharger.

7. The method of claim 6 wherein further comprising:

providing said speed sensor housing with an integral connector for connecting said speed sensor to said turbocharger.

8. The method of claim 1 wherein said at least one magnetoresistive component comprises an anisotropic magnetoresistive (AMR) transducer.

9. The method of claim 1 wherein said at least one magnetoresistive component comprises a giant magnetoresistive (GMR) transducer.

10. A method for orienting and calibrating a magnet for use with a speed sensor:

mapping a magnet in at least two planes thereof in order to locate said magnet accurately relative to at least one magnetoresistive element maintained within a speed sensor housing, wherein said speed sensor housing comprises a thermoplastic package;

identifying an optimal location of said magnet with respect to said at least one magnetoresistive element and said sensor housing in response to mapping said magnet;

bonding said magnet to said speed sensor housing in order to implement a speed sensor thereof maintained by said speed sensor housing for use in speed detection operations; and

forming a thermoset channel from said speed sensor housing, wherein said magnet is bonded to said thermoset housing of said speed sensor housing.

11. The method of claim 10 further comprising:

integrating said speed sensor housing with a leadframe, wherein said lead frame maintains said speed sensor housing, including at least one ASIC, a plurality of bead components, and a plurality of capacitors thereof.

12. The method of claim 10 further comprising:

calibrating said speed sensor utilizing a plurality of calibration terminals integrated with said speed sensor housing.

13. The method of claim 10 further comprising:

adapting said speed sensor for use with a turbocharger.

14. The method of claim 13 wherein further comprising:

providing said speed sensor housing with an integral connector for connecting said speed sensor to said turbocharger.

15. The method of claim 10 wherein said at least one magnetoresistive component comprises an anisotropic magnetoresistive (AMR) transducer.

16. The method of claim 10 wherein said at least one magnetoresistive component comprises a giant magnetoresistive (GMR) transducer.

17. A method for orienting and calibrating a magnet for use with a speed sensor:

mapping a magnet in at least two planes thereof in order to locate said magnet accurately relative to at least one magnetoresistive element maintained within a speed sensor housing, wherein said speed sensor housing comprises a thermoplastic package;

identifying an optimal location of said magnet with respect to said at least one magnetoresistive element and said sensor housing in response to mapping said magnet;

bonding said magnet to said speed sensor housing in order to implement a speed sensor thereof maintained by said speed sensor housing for use in speed detection operations;

forming a thermoset channel from said speed sensor housing, wherein said magnet is bonded to said thermoset housing of said speed sensor housing; and

integrating said speed sensor housing with a leadframe, wherein said lead frame maintains said speed sensor housing, including at least one ASIC, a plurality of bead components, and a plurality of capacitors thereof.

18. The method of claim 17 further comprising:

calibrating said speed sensor utilizing a plurality of calibration terminals integrated with said speed sensor housing.

19. The method of claim 17 further comprising:

adapting said speed sensor for use with a turbocharger; and

providing said speed sensor housing with an integral connector for connecting said speed sensor to said turbocharger.