System for determining quality of a rotating position sensor system

• US 8,442,793 B2
• Filed: 09/28/2010
• Issued: 05/14/2013
• Est. Priority Date: 09/28/2010
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Goodwin, William Russell
• Primary Examiner(s): Le, John H
• Application Number:
  US12/892,447
• Publication Number:
  US 20120078564A1
• Time in Patent Office: 959 Days
• Field of Search: 702/38, 702/64, 702/93, 702/94, 702/115, 702/116, 702/119, 702/120, 702/123, 702/151, 702/163, 702/183, 731/46, 324/207.25, 68/120.2
• US Class Current: 702/116
• CPC Class Codes: G01B 7/30 for measuring angles or tapers; for testing the alignment of axes
• CPC Class Codes: G01D 18/00 Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
• CPC Class Codes: G01D 5/145 influenced by the relative movement between the Hall device and magnetic fields see G01R33/06

Abstract

A method for improving a position sensing system which measures a rotating object is presented. In one embodiment, the method outputs the position of the rotating object while the object is rotating, and the method follows an external command on the sensor output line when the object is not rotating to output information other than the position information.

Claims

1. A method for assessing quality of a magnetic sensor profile, comprising:

during rotation of an object sensed by a position sensor, storing data associated with the quality of the magnetic sensor profile within the position sensor, and outputting position data via a pin of the position sensor; and

during non-rotation of the object, outputting at least a portion of the data associated with the quality of the magnetic sensor profile via the pin.

2. The method of claim 1, where the at least the portion of the data associated with the quality of the magnetic sensor profile is output after an external system changes a state of an output of the position sensor while the object is not rotating and while the sensor is powered.

3. The method of claim 2, where the quality of the magnetic sensor profile includes data related to an amplification of a magnetic profile.

4. The method of claim 2, where the at least the portion of the data associated with the quality of the magnetic sensor profile is related to a tooth of the object.

5. The method of claim 1, where the object is an engine crankshaft and where the data associated with the quality of the magnetic sensor profile is output to an engine controller or a diagnostic tool.

6. The method of claim 1, where the at least the portion of the data associated with the quality of the magnetic sensor profile is output from the pin, the pin being a digital output of the position sensor, and where the digital output of the position sensor is routed to an input of the position sensor.

7. The method of claim 6, where an external controller changes the digital output from a first logic state to a second logic state after the object stops rotating, and where the position sensor outputs the at least the portion of the data associated with the quality of the magnetic sensor profile after the external controller changes the digital output from the first logic state.

8. The method of claim 1, where the position sensor is a transmission position sensor or an engine position sensor.

9. A system for determining a quality of a magnetic sensor profile, comprising:

a sensor configured to sense a position of an object, the sensor configured with an output that provides position information of the object to a single output pin while the object is rotating, and the sensor configured to output data associated with the quality of the magnetic sensor profile other than the position information of the object via the single output pin when the object is not rotating.

10. The system of claim 9, where the position information is a square wave related to the position of the object, and where the data associated with the quality of the magnetic sensor profile is determined during a period of rotation of the object during predetermined conditions.

11. The system of claim 9, where the data associated with the quality of the magnetic sensor profile is transmitted via the single output pin to an external system.

12. The system of claim 11, where the external system is an engine controller or a diagnostic tool.

13. The system of claim 11, where the sensor is an engine position sensor or a transmission sensor.

14. The system of claim 11, where the sensor includes an application specific integrated circuit with instructions to make adjustments to the position information during rotation of the object before the position information is output.

15. The system of claim 11, where the sensor includes an application specific integrated circuit with instructions for entering a diagnostic mode after the external system changes a state of the single output pin, the ASIC including further instructions for transmitting data associated with at least one of internally stored waveform data, diagnostic codes, and sensor status codes.

16. A system for determining a position of a rotating object, comprising:

a sensor with a first controller having instructions for sensing a position of an object, the first controller having further instructions for outputting position information of the object via a single output pin while the object is rotating, and the first controller having further instructions for outputting data associated with a quality of a magnetic sensor profile other than the position information of the object via the single output pin when the object is not rotating; and

a second controller, the second controller external of the sensor and including instructions for adjusting a state of the single output pin after the object stops rotating.

17. The system of claim 16, where the second controller includes further instructions for interpreting the information other than the position information.

18. The system of claim 16, where the second controller includes further instructions for controlling an engine including stopping the engine from rotating, and where the second controller adjusts the state of the single output pin after stopping the engine.

19. The system of claim 16, where the sensor outputs the data associated with the quality of the magnetic sensor profile from the single output pin in a digital format, and where the data associated with the quality of the magnetic sensor profile is data related to rotation of the object, and where the data associated with the quality of the magnetic sensor profile is determined during a period of rotation of the object during predetermined conditions.

20. The system of claim 16, where the second controller is an engine controller, a diagnostic controller, or a controller of a vehicle.