Even driven data acquisition switch

• US 20130282228A1
• Filed: 04/23/2012
• Published: 10/24/2013
• Est. Priority Date: 04/23/2012
• Status: Active Grant

• Current Assignee: GeoTab Incorporated
• Original Assignee: GeoTab Incorporated
• Inventors: Cawse, Neil Charles, Beams, Darren Marc Lohmann, Partheniou, Antonios, Dumitrascu, Stelian
• Granted Patent: US 8,688,380 B2
• Time in Patent Office: Days
• US Class Current: 701/32.2
• CPC Class Codes: B60W 2556/45 External transmission of data to or from the vehicle
• CPC Class Codes: G07C 5/08 Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
• CPC Class Codes: G07C 5/085 using electronic data carriers

Abstract

A method and apparatus in a vehicular telemetry system and a remote data analysis system for detecting an event and switching a data acquisition mode. Checking a state of a data acquisition mode. If the state is in a filtered data state and if an indicator value is at or above a threshold value, then switch the data acquisition mode to an unfiltered data state and acquire unfiltered data. If the data acquisition mode is in an unfiltered data state and if the indicator value is below the threshold value, switch the data acquisition mode to a filtered data state and acquire filtered data.

Claims

1. A computer readable storage medium having computer readable program code for executing a method for detecting a significant event and switching the data acquisition mode, said method comprising the steps of:

checking a state of a data acquisition mode,

if said state is in a filtered data state and if a real time steep accelerometer indicator value is at or above an accelerometer threshold value,

switch said data acquisition mode to an unfiltered data state and acquire a series of high frequency unfiltered data points,

if said data acquisition mode is in an unfiltered data state and if said real time steep accelerometer indicator value is below said accelerometer threshold value,

switch said data acquisition mode to a filtered data state and acquire a series of low frequency filtered data points.

2. A method as in claim 1 wherein said unfiltered data state is an adaptive data state, a further including an adaptive filter, said adaptive filter being less than a filter in said filtered data state and more than a filter in said unfiltered data state wherein said series of low frequency unfiltered data points is adaptive data.

3. A method as in claim 1 or 2 wherein said real time steep accelerometer indicator value is determined by a filter and accelerometer data.

4. A method as in claim 3 wherein said filter is a low pass filter.

5. A method as in claim 3 wherein said filter is a moving average filter.

6. A method as in claim 5 wherein said moving average filter provides an accelerometer based low frequency filtered data point and said real time steep accelerometer indicator value is determined by comparing said accelerometer based filtered data point with an accelerometer based high frequency unfiltered data point.

7. A method as in claim 6 wherein said comparing is selected from the group consisting of:

subtracting an accelerometer based low frequency filtered data point and an accelerometer based high frequency unfiltered data point, and

an absolute value between an accelerometer based low frequency filtered data point and an accelerometer high frequency unfiltered data point.

8. A method as in claim 1 or 2 wherein said accelerometer threshold value is selected from the group consisting of:

a set predetermined value,

a programmable value,

a real time programmable value,

a vector based value, and

a magnitude based value.

9. A method as in claim 1 or 2 wherein said accelerometer threshold value includes multiple threshold values.

10. A method as in claim 9 wherein said multiple threshold values are graduated values selected from the group consisting of

a high value,

a medium value, and

a low value.

11. A method as in claim 1 or 2 wherein each axis of an accelerometer has an associated accelerometer threshold value.

12. A method as in claim 1 or 2 wherein said series of high frequency unfiltered data points and said low frequency filtered data points are stored as a data log.

13. A method as in claim 12 wherein said data log is stored in memory.

14. A method as in claim 12 wherein said data log is transmitted to a remote device.

15. A method as in claim 12 wherein said data log is a data structure.

16. A method as in claim 15 wherein said high frequency unfiltered data points includes data selected from the group consisting of:

accelerometer data,

vehicular data and information, and

GPS data.

17. A method as in claim 15 wherein said low frequency filtered data points includes data selected from the group consisting of:

accelerometer data,

vehicular data and information, and

GPS data.

18. A method as in claim 12 wherein said data log includes said high frequency unfiltered data points interspersed with said low frequency filtered data points characterized by said significant event.

19. A method as in claim 15 wherein said data structure is stored in a computer readable medium.

20. An apparatus for detecting a significant event and switching a data acquisition mode, the apparatus comprising:

a microprocessor, an accelerometer, and a memory,

said microprocessor communicating with said accelerometer and said memory,

said accelerometer communicating data corresponding to an axis of said accelerometer to said microprocessor,

said microprocessor executing computer program code for;

checking a state of said data acquisition mode,

if said state is in a filtered data state and if a real time steep accelerometer indicator value is at or above an accelerometer threshold value,

switch said data acquisition mode to an unfiltered data state and acquire a series of high frequency unfiltered data points,

if said data acquisition mode is in an unfiltered data state and if said real time steep accelerometer indicator value is below said accelerometer threshold value,

switch said data acquisition mode to a filtered data state and acquire a series of low frequency filtered data points.

21. An apparatus as in claim 20 wherein said unfiltered data state is an adaptive data state, further including an adaptive filter being less than a filter in said filtered data state and more than a filter in said unfiltered data state wherein said acquire high frequency unfiltered data points is adaptive data.

22. An apparatus as in claim 20 or 21 wherein said microprocessor executing computer program code further determining said real time steep accelerometer indicator value by a filter and accelerometer data.

23. An apparatus as in claim 22 wherein said filter is a low pass filter.

24. An apparatus as in claim 22 wherein said filter is a moving average filter.

25. An apparatus as in claim 24 wherein said microprocessor executing computer program code of said moving average filter providing an accelerometer based low frequency filtered data point and said real time steep accelerometer indicator value is determined by comparing said accelerometer based low frequency filtered data point with an accelerometer based high frequency unfiltered data point.

26. An apparatus as in claim 25 wherein said comparing is selected from the group consisting of:

subtracting an accelerometer based low frequency filtered data point and an accelerometer based high frequency unfiltered data point, and

an absolute value between an accelerometer based low frequency filtered data point and an accelerometer high frequency unfiltered data point.

27. An apparatus as in claim 20 or 21 wherein said accelerometer threshold value is selected from the group consisting of:

a set predetermined value,

a programmable value,

a real time programmable value,

a vector based value, and

a magnitude based value.

28. An apparatus as in claim 26 wherein said accelerometer threshold value includes multiple threshold values selected from the group consisting of:

a high value,

a medium value, and

a low value.

29. An apparatus as in claim 20 or 21 wherein each axis of said accelerometer includes an associated accelerometer threshold value.

30. An apparatus as in claim 20 or 21 wherein said microprocessor stores said high frequency unfiltered data points and said low frequency filtered data points as a data log.

31. An apparatus as in claim 30 wherein said data log is stored in memory by said microprocessor.

32. An apparatus as in claim 30 further including a communications microprocessor wherein said data log is transmitted to a remote device.

33. An apparatus as in claim 30 wherein said data log is a data structure.

34. An apparatus as in claim 33 wherein said high frequency unfiltered data points includes data selected from the group consisting of:

accelerometer data,

vehicular data and information, and

GPS data.

35. An apparatus as in claim 33 wherein said low frequency filtered data points includes data selected from the group consisting of:

accelerometer data,

vehicular data and information, and

GPS data.

36. An apparatus as in claim 31 wherein said data log includes said high frequency unfiltered data points interspersed with said low frequency filtered data points characterized by said significant event.

37. An apparatus as in claim 20 or 21 wherein said accelerometer has multiple axes and an associated accelerometer threshold value for each axis and a real time steep accelerometer indicator value for each axis.

38. (canceled)

39. A system for detecting a significant event, the system comprising:

a vehicular telematics system, and

a remote device,

said telematics system including;

an on-board portion and a resident portion, said on-board portion including a microprocessor and firmware for executing computer program code for detecting an event and formatting a data structure, an accelerometer for providing accelerometer data to said microprocessor, a communications microprocessor for transmitting said data structure, a GPS module for providing GPS data to said microprocessor, memory for storing said data structure, and an interface to the resident portion for receiving vehicular data and information from a vehicle network communications bus and associated microcontrollers and sensors,

said remote device including a server and access to at least one data analysis application computer program,

said microprocessor and firmware checking a state of a data acquisition mode, if said state is in a filtered data state and if a real time steep accelerometer indicator value is at or above an accelerometer threshold value, switch said data acquisition mode to an unfiltered data state and acquire a series of high frequency unfiltered data points, if said data acquisition mode is in an unfiltered data state and if said real time steep accelerometer indicator value is below said accelerometer threshold value, switch said data acquisition mode to a filtered data state and acquire a series of low frequency filtered data points,

said microprocessor storing said series of high frequency unfiltered data points and said series of low frequency filtered data points in a data log as a data structure including high frequency unfiltered data interspersed with said low frequency filtered data characterized by said significant event,

wherein said telematics system transmits said data structure to said remote device and said remote device stores said data structure for further analysis by said data analysis application computer program.