Occupant seat detection system and method

• US 8,154,394 B2
• Filed: 05/01/2009
• Issued: 04/10/2012
• Est. Priority Date: 05/01/2008
• Status: Active Grant

• Current Assignee: Aptiv Technologies AG (Aptiv PLC)
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Inventors: Hansen, Mark C.
• Primary Examiner(s): POPE, DARYL C
• Application Number:
  US12/433,993
• Publication Number:
  US 20090295554A1
• Time in Patent Office: 1,075 Days
• Field of Search: 340/425.5, 340/506, 340/3.1, 340/933, 340/426.24
• US Class Current: 340/425.5
• CPC Class Codes: B60N 2/002 Seats provided with an occupancy detection means mounted therein or thereon detection means responsive to presence or absence of children B60N2/266
• CPC Class Codes: B60N 2/0035 characterised by the sensor data transmission, e.g. wired connections or wireless transmitters therefor; characterised by the sensor data processing, e.g. seat sensor signal amplification or electric circuits for providing seat sensor information
• CPC Class Codes: B60N 2/5685 Resistance
• CPC Class Codes: B60N 2210/12 Capacitive; Electric field

Abstract

An occupant system includes a sensing device disposed in a seat and an electronic device configured to acquire data from the sensing device. The electronic device includes a system controller which uses that data to determine an appropriate system response. Data is acquired in at least two different system configurations and in at least two different time periods. A data set is created which represents a comparison of data acquired in the different configurations and times. The elements of this data set are compared to each other to identify anomalous data and respond accordingly.

Claims

1. An occupant detection system comprising:

at least one sensing device disposed in a seat, wherein the sensing device is configured to detect signals at an operating frequency;

an electronic device configured to acquire data from the at least one sensing device, wherein the data is indicative of a signal value at the operating frequency, wherein the electronic device acquires a first set of data and a second set of data during a first time period and second time period distinct from the first time period, each set of data comprising data acquired in at least two sensing device configurations characterized as detecting signals at distinct operating frequencies, wherein the first set of data and second set of data are compared to each other to create a set of change data having an individual element for each operating frequency; and

a heuristic configured to determine anomalous acquired data by comparing the individual elements for each operating frequency within the set of change data to each other.

2. The system of claim 1 wherein the individual elements within the set of change data are compared to each other by determining whether all elements have an appropriate relationship to each other according to a predefined formula.

3. The system of claim 2 wherein the relationship between the elements is that the values of all of the elements are equal to each other within a predefined range.

4. The system of claim 2 wherein an element of the set of change data which does not have an appropriate relationship to the other elements is modified to have the appropriate relationship.

5. The system of claim 4 wherein the element is modified based on a known relationship between the elements in the set of change data.

6. The system of claim 5 wherein the element is modified based on interpolation of the values of the other elements in the set of change data.

7. The system of claim 5 wherein the element is modified based on extrapolation from the values of the other elements in the set of change data.

8. The system of claim 2 wherein the element not having an appropriate relationship to the other elements is replaced with data that was acquired as a backup.

9. The system of claim 1 wherein the electronic device acquires subsequent sets of data and the sets of acquired data are compared to each other to create subsequent sets of change data.

10. The system of claim 9 wherein an anomalous element in the first set of change data is compared with the corresponding element in other sets of the subsequent sets of change data to determine if the anomalous element consistently represents anomalous data.

11. The system of claim 10 wherein if an element consistently represents anomalous data, the system automatically adapts by changing the configuration of the system.

12. The system of claim 11 wherein the system configuration is changed by modifying the operating frequency of the sensing device.

13. A method of detecting an occupant of a seat, comprising the steps of:

providing an occupant detection system including at least one sensing device disposed in a seat, wherein the sensing device is configured to detect signals at an operating frequency, and an electronic device configured to acquire data from the at least one sensing device, wherein the data is indicative of a signal value at the operating frequency;

acquiring a first set of data which includes at least two elements, the at least two elements corresponding to the response of the system when the sensing device is configured differently for acquisition of each of the at least two elements at distinct operating frequencies;

acquiring a second set of data which includes at least two elements, the at least two elements corresponding to the response of the system when the sensing device is configured differently for acquisition of each of the at least two elements at the distinct operating frequencies;

wherein each element of the first data set is acquired at the same distinct operating frequencies as a corresponding element of the second data set;

comparing the individual elements of the first data set to the corresponding individual elements of the second data set to create a first set of change data;

comparing the elements within the first set of change data to each other to identify anomalous data.

14. The method of claim 13 further comprising creating at least one subsequent set of change data according to the method used to create the first set of change data.

15. The method of claim 14 further comprising comparing the elements of the first set of change data to the elements of the at least one subsequent set of change data to identify elements which consistently have anomalous values across the selected sets of change data.

16. The method of claim 15 further comprising adapting the system automatically when an element with consistently anomalous values is identified.

17. The method of claim 16 wherein adapting the system automatically is accomplished by changing the operating frequency of a device used within the system for acquiring data.

18. The method of claim 13 wherein identifying anomalous data includes comparing the elements of the first set of change data to each other to check for consistency according to a predefined relationship.

19. The method of claim 15 wherein identifying elements which consistently have anomalous data includes checking for consistency according to a predefined relationship.

20. The method of claim 13 further comprising replacing an anomalous data element of the first set of change data with a value determined from the values of the other elements in the first set of change data according to a predefined relationship.

21. The method of claim 13 further comprising replacing an anomalous data element of the first set of change data with a value interpolated or extrapolated from the values of the other elements within the first set of change data.

22. The method of claim 14 further comprising replacing an anomalous data element of the first set of change data with a value interpolated or extrapolated from values of the corresponding elements in at least one of the at least one subsequent set of change data.