Position sensing system and method

• US 8,140,286 B2
• Filed: 08/14/2009
• Issued: 03/20/2012
• Est. Priority Date: 08/14/2009
• Status: Expired due to Fees

• Current Assignee: Continental Automotive Systems, Inc. (Continental AG)
• Original Assignee: Continental Automotive Systems, Inc. (Continental AG)
• Inventors: O'Gorman, Patrick, Stephens, Dennis L.
• Primary Examiner(s): BHAT, ADITYA S
• Application Number:
  US12/541,508
• Publication Number:
  US 20110040513A1
• Time in Patent Office: 949 Days
• Field of Search: 702/94
• US Class Current: 702/94
• CPC Class Codes: F16H 59/70 dependent on the ratio established
• CPC Class Codes: G01D 3/036 on measuring arrangements themselves
• CPC Class Codes: G01D 5/145 influenced by the relative movement between the Hall device and magnetic fields see G01R33/06

Abstract

The linear position of a moving mechanical component is determined. A plurality of values of a quantity using a plurality of sensors is sensed and the sensed values are indicative of the linear position of the mechanical component. The plurality of sensed values are converted into a plurality of best linear position estimates concerning the mechanical component. One or more compensations are applied to at least some of the plurality of best linear position estimates. Each of the compensations are applied to account for a relative positioning of one of the plurality of sensors with respect to the others. A plurality of weighting factors associated with each of the plurality of best linear position estimates are determined. The position of the mechanical component is determined using the plurality of best linear position estimates and the plurality of weighting factors.

Claims

1. A method of determining the linear position of a moving mechanical component, the method comprising:

sensing a plurality of values of a quantity using a plurality of sensors, the sensed values indicative of the linear position of the mechanical component;

converting the plurality of sensed values into a plurality of best linear position estimates concerning the mechanical component;

applying one or more compensations to at least some of the plurality of best linear position estimates, each of the compensations being applied to account for a relative positioning of one of the plurality of sensors with respect to the others;

determining a plurality of weighting factors associated with each of the plurality of best linear position estimates;

determining the position of the mechanical component using the plurality of best linear position estimates and the plurality of weighting factors.

2. The method of claim 1 further comprising at least partially controlling a movement of the mechanical component using the determined position.

3. The method of claim 1 wherein sensing a plurality of values of a quantity comprises sensing a plurality of values from two or more sensors.

4. The method of claim 1 wherein the quantity comprises a quantity selected from the group consisting of a voltage representing a magnetic flux voltage and a light intensity value.

5. The method of claim 1 wherein the converting comprises obtaining the best linear position estimates at least in part by using a look-up table.

6. The method of claim 1 wherein determining a plurality of weighting factors comprises obtaining the weighting factors from a look-up table.

7. The method of claim 1 wherein determining the position of the mechanical component comprises determining a weighted average of the best linear position estimates.

8. The method of claim 1 wherein the mechanical component is a component selected from the group consisting of a transmission system component and a braking system component.

9. An apparatus for determining the linear position of a moving mechanical component, the apparatus comprising:

an interface having an input and an output, the input receiving sensed values of a quantity related to a linear position of the moving mechanical component;

a memory that stores a plurality of weighting factors;

a controller coupled to the interface and the memory, the controller configured to convert the plurality of sensed values received at the input of the interface into a plurality of position estimates indicative of the linear position of the moving mechanical component, the controller being further configured to apply one or more compensations to at least some of the plurality of best estimates of the linear position, each of the compensations being applied to account for a relative positioning of the each of the plurality of sensors with respect to the others, the controller being further configured to select and obtain a plurality of weighting factors from the memory, the selected weighting factors associated with the plurality of best linear position estimates, the controller being further configured to determine the linear position of the mechanical component using the plurality of best estimates and the plurality of weighting factors.

10. The apparatus of claim 9 wherein the controller is configured to determine the linear position and make the linear position available at the output of the interface.

11. The apparatus of claim 9 wherein the controller is further configured to determine a control signal that at least partially controls a movement of the mechanical component, the control signal being determined at least in part by using the determined linear position.

12. The apparatus of claim 9 wherein the plurality of sensors comprises two or more sensors.

13. The apparatus of claim 9 wherein the quantity comprises a quantity selected from the group consisting of a voltage representing a magnetic flux voltage and a light intensity value.

14. The apparatus of claim 9 wherein the controller is configured to obtain the best linear position estimates at least in part by using stored values in the look-up table.

15. The apparatus of claim 9 wherein the linear position of the mechanical component is determined by a weighted average.

16. The apparatus of claim 9 wherein the mechanical component is a component selected from the group consisting of a transmission system component and a braking system component.

17. The apparatus of claim 9 wherein the weighting factors are associated with a slope of a magnetic response curve.

18. The apparatus of claim 9 wherein the weighting factors are selecting from a group consisting of zero and non-zero values.

19. The apparatus of claim 9 wherein the compensations are zero or non-zero values.