Assembly with non-contacting position sensor

• US 20070113824A1
• Filed: 01/19/2007
• Published: 05/24/2007
• Est. Priority Date: 03/06/2002
• Status: Active Grant

• Current Assignee: BorgWarner Incorporated
• Original Assignee: BorgWarner Incorporated
• Inventors: Keefover, Robert, Pringle, Hal, Halsig, Michael
• Granted Patent: US 7,594,494 B2
• Time in Patent Office: Days
• US Class Current: 123/337
• CPC Class Codes: F02D 11/106 Detection of demand or actuation
• CPC Class Codes: F02D 9/1065 Mechanical control linkage between an actuator and the flap, e.g. including levers, gears, springs, clutches, limit stops of the like
• CPC Class Codes: F02D 9/107 Manufacturing or mounting details

Abstract

An electronic throttle control system is described. The system includes a non-contacting sensor stator integrated into an electronic throttle body and is aligned to the sensor rotor attached to the shaft to properly set sensor air gap by assembly aids or by close fit to the throttle body. A motor and vehicle connector is electrically connected to the sensor stator but is allowed to be positioned separately from the sensor stator by means of a flexible interconnect.

Claims

1. An electronic throttle control system comprising:

a housing;

a throttle bore formed within said housing;

a throttle plate disposed within said throttle bore;

a throttle shaft operably connected to said throttle plate;

a sensor assembly operably aligned with said throttle shaft;

an electrical connector for distributing connections between said sensor assembly and said motor;

a motor is operably associated with the throttle shaft for effecting the movement of said throttle shaft in response to a control signal that is inputted from said electrical connector; and

a flexible interconnect connected between said sensor assembly and said electrical connector, wherein said flexible interconnect functions as a medium to transmit control signals between said sensor stator and said motor.

2. The electronic throttle control system of claim 1 wherein said sensor assembly further comprises:

a sensor rotor connected to the said first end of said throttle shaft, wherein said sensor rotor including a nested area;

a sensor stator positioned inside of said nested area in close proximity to said sensor rotor so that said sensor rotor can rotate freely about said sensor stator, said sensor stator and said sensor rotor being separated by an air gap; and

a magnet assembly disposed inside of said nested area formed by said sensor rotor and said sensor stator.

3. The electronic throttle control system of claim 2 further comprising a printed circuit board electronically connected to said sensor stator and said flexible interconnect, wherein said printed circuit board is connectable to said housing and forms a mounting surface for said stator.

4. The electronic throttle control system of claim 3 wherein said printed circuit board is a Logic chip capable of functioning as an electronic control unit for receiving a user input signal, and throttle position signal and transmitting a control signal to said motor.

5. The electronic throttle control system of claim 3 further comprising at least one aperture through said printed circuit board adjacent the edge of said stator, wherein said aperture may be used for the insertion of an alignment tool.

6. The electronic throttle control system of claim 5 further comprising an alignment tool inserted inside of said aperture.

7. The electronic throttle control system of claim 6 wherein said alignment tool has a tip with one or more flexible fingers configured to slide into said aperture so that said fingers are positioned between said rotor and said stator during alignment, wherein said flexible fingers are configured to bend, engage and hold said stator during alignment.

8. The electronic throttle control system of claim 7 wherein said aperture is two or more holes spaced about the edge of said stator and said alignment tool is two or more tapered pins that are inserted between said stator and said rotor.

9. The electronic throttle control system of claim 8 further comprising a gear train connected between said motor and said throttle shaft, wherein said gear train rotates said throttle shaft in response to actuation of said motor.

10. The electronic control system of claim 9 wherein said gear train has a spring system interconnected to said gear train that is part of an emergency fail-safe system.

11. The electronic throttle control system of claim 9 wherein the rotation of said throttle shaft is accomplished with one or more belts connected between said motor and said throttle shaft, wherein said one or more belts rotate said throttle shaft in response to said actuation of said motor.

12. The electronic throttle control system of claim 11 wherein said one or more belts is one or more chains.

13. The electronic throttle control system of claim 1 wherein said sensor assembly is a non-contact sensor.

14. An electronic throttle control system comprising:

a casting;

a throttle bore formed within said casting;

a throttle plate disposed within said throttle bore;

a throttle shaft extending across said throttle bore, wherein said throttle shaft has a first end and a second end;

a gear train that operably connects to said throttle shaft and effectively rotates said throttle shaft, wherein said gear train has a spring system interconnected to said gear train that is part of an emergency fail-safe system;

a sensor rotor connected to the said first end of said throttle shaft, wherein said sensor rotor is configured to have a nested area;

a sensor stator positioned inside of said nested area in close proximity to said sensor rotor so that said sensor rotor can rotate freely about said sensor stator;

a magnet assembly disposed inside of said nested area formed by said sensor rotor and said sensor stator, wherein said nested area has an air gap between said stator and said magnetic assembly, wherein said magnetic assembly is a non-contact sensor;

a printed circuit board fastened to said casting, said printed circuit board being electrically connected to and forming a mounting surface for said sensor stator, wherein said printed circuit board, said sensor stator and said casting are all fastened together using one or more fasteners;

an electrical connector fastened to said casting;

a motor connected to said electrical connector, wherein said motor controls the position of said throttle plate by rotating said gear train in response to a control signal that is inputted from said electrical connector; and

a flexible interconnect connected between said electrical connector for insulating the sensor form misalignment due to thermal expansion.

15. An electronic throttle control system comprising:

a housing;

a throttle bore formed within said housing;

a throttle plate disposed within said throttle bore;

a throttle shaft connected to said throttle plate and extending across said throttle bore, said throttle bore including a first end motor end;

a sensor rotor connected to the said first end of said throttle shaft, wherein said sensor rotor including a nested area;

a sensor stator positioned inside of said nested area in close proximity to said sensor rotor so that said sensor rotor can rotate freely about said sensor stator, said sensor stator and said sensor rotor being separated by an air gap;

a magnet assembly disposed inside of said nested area formed by said sensor rotor and said sensor stator;

a printed circuit board connected to and forming a mounting surface for said sensor stator;

an electrical connector connected to said printed circuit; and

a motor connected to said electrical connector, wherein said motor controls the position of throttle plate by rotating said throttle shaft in response to a control signal that is inputted from said electrical connector.

16. The system of claim 15 wherein said throttle bore and said throttle plate have a circular shape.

17. The system of claim 15 wherein said throttle shaft has a first end and a second end each supported by a pair of bearings.

18. The electronic throttle control system of claim 15 further comprising a gear train connected between said motor and said throttle shaft, wherein said gear train rotates said throttle shaft in response to actuation of said motor.

19. The electronic control system of claim 18 wherein said gear train has a spring system interconnected to said gear train that is part of an emergency fail-safe system.

20. The electronic throttle control system of claim 15 wherein the rotation of said throttle shaft is accomplished with one or more belts connected between said motor and said throttle shaft, wherein said one or more belts rotate said throttle shaft in response to said actuation of said motor.

21. The electronic throttle control system of claim 20 wherein said one or more belts is one or more chains.

22. The electronic throttle control system of claim 15 wherein said sensor stator, said magnetic assembly, and said sensor rotor is a non-contact sensor.

23. The electronic throttle control system of claim 22 wherein said sensor stator, magnet assembly, and said sensor rotor come in contact to form a contact sensor.

24. The electronic throttle control system of claim 15 wherein said printed circuit board, said sensor stator and said casting have one or more alignment holes which may be used for perfectly aligning said printed circuit board, said sensor stator and said casting during assembly of said system.

25. The electronic throttle control system of claim 15 wherein said electrical connector is fastened to said casting and implements a flexible interconnect to connect said electrical connector to said printed circuit board.

26. The electronic throttle control system of claim 15 wherein said electric motor is a stepper motor having a protruding shaft which connects to said gear train.

27. A method of electronically controlling a throttle comprising the steps of:

providing a throttle body including a throttle bore, and a throttle plate connected to an actuation shaft;

providing a motor operatively connected to said throttle plate for controlling the throttle based on a user input;

providing a non-contact sensor assembly which requires precise permanent alignment with said shaft; and

providing a flexible connector for connecting said motor to said sensor.

28. The method of claim 27 wherein the precise alignment of said non-contact sensor assembly is accomplished using an alignment tool configured to removably grasp and hold said sensor assembly relative to said rotor.

29. A method of electronically controlling a throttle comprising the steps of:

aligning an electrical connector on a housing;

fastening said electrical connector to said housing;

engaging an alignment means to a stator;

aligning said stator to a precise alignment relative to a throttle shaft, wherein said stator and said throttle shaft form a non-contact sensing element;

fastening said stator so said housing; and

disengaging and removing said alignment means from said stator.

30. The method of claim 29 further comprising the step of:

providing a flexible interconnect for connecting said stator and said electrical connector wherein said flexible interconnect permits the independent aligning and fastening of said electrical connector and said stator.