Motion detection devices and systems

• US 9,423,318 B2
• Filed: 07/29/2014
• Issued: 08/23/2016
• Est. Priority Date: 07/29/2014
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Liu, Haiyang, Baker, Jeffrey, Cunningham, Charles Joseph IV, Caldwell, William Stephen
• Primary Examiner(s): CHEUNG, CALVIN K
• Application Number:
  US14/445,871
• Publication Number:
  US 20160033366A1
• Time in Patent Office: 756 Days
• US Class Current: 1/1
• CPC Class Codes: G01M 17/007 Wheeled or endless-tracked vehicles G01M17/08 takes precedence
• CPC Class Codes: G01P 13/00 Indicating or recording presence, absence, or direction, of movement electric switches H01H; counting moving objects G06M7/00
• CPC Class Codes: G01P 3/50 for measuring linear speed G01P3/56 takes precedence
• CPC Class Codes: G07C 5/02 Registering or indicating driving, working, idle, or waiting time only apparatus forming part of taximeters G07B13/00

Abstract

Motion detection devices and systems are described herein. One motion detection device includes an inertial measurement unit (IMU) configured to measure velocity, orientation, and gravitational forces of the motion detection device and a computing component. The computing component can be configured to determine spectrum parameters of a mobile vehicle associated with the motion detection device using measurements from the IMU, determine IMU orientation parameters using measurements from the IMU, and estimate motion of the mobile vehicle using the spectrum parameters, the IMU orientation parameters, measurements from the IMU, and a motion estimation function.

Claims

1. A motion detection device including:

an inertial measurement unit (IMU) configured to measure velocity, orientation, and gravitational forces of the motion detection device; and

a computing component configured to;

determine spectrum parameters of a mobile vehicle associated with the motion detection device using measurements from the IMU, wherein spectrum parameters include a cutoff frequency range of the mobile vehicle when idle and a maximum frequency of the mobile vehicle when moving along a forward direction;

determine IMU orientation parameters using measurements from the IMU;

estimate motion of the mobile vehicle using the spectrum parameters, the IMU orientation parameters, measurements from the IMU, and a motion estimation function; and

deactivate information conveyed to a user in response to the spectrum parameters of the mobile vehicle being below the cutoff frequency range.

2. The device of claim 1, wherein the motion estimation function includes a sliding window Discrete Fourier Transformation function (DFT).

3. The device of claim 1, including a user interface to provide a display on a screen in response to a determination that the mobile vehicle is not in motion.

4. The device of claim 1, wherein the IMU orientation parameters include IMU accelerometer readings along X, Y, and Z axes.

5. The device of claim 1, wherein the computing component configured to estimate motion includes the computing component configured to detect whether the mobile vehicle is in motion using a motion estimation threshold.

6. A motion detection device including:

an inertial measurement unit (IMU) configured to measure velocity, orientation, and gravitational forces of the motion detection device; and

a computing component configured to;

determine spectrum parameters of a mobile vehicle associated with the motion detection device using measurements from the IMU;

determine IMU orientation parameters using measurements from the IMU;

estimate motion of the mobile vehicle using the spectrum parameters, the IMU orientation parameters, measurements from the IMU, a motion estimation function, and a motion estimation threshold; and

deactivate information conveyed to a user in response to the spectrum parameters of the mobile vehicle being below the cutoff frequency range.

7. The device of claim 6, wherein the computing component configured to determine the IMU orientation parameters includes determining a gravity vector to determine a vertical tilting angle.

8. The device of claim 6, wherein the computing component is configured to filter the IMU measurements, wherein filtering the IMU measurements includes performing:

gravity correction to distill linear accelerations; and

offset correction to remove systematic sensor reading drifts using a zero resetting parameter.

9. The device of claim 6, wherein the computing component is configured to perform an exponentially weighted moving average (EWMA) filter process in response to resampling to 100 hertz.

10. The device of claim 6, wherein the computing component is configured to estimate speed of the mobile vehicle based on a past speed estimate and current IMU measurements.

11. A non-transitory computer-readable medium storing instructions executable by a processing resource to:

an inertial measurement unit (IMU) configured to measure velocity, orientation, and gravitational forces of the motion detection device; and

a computing component configured to;

determine spectrum parameters of a mobile vehicle associated with the motion detection device using measurements from the IMU, wherein spectrum parameters include a cutoff frequency range of the mobile vehicle when idle and a maximum frequency of the mobile vehicle when moving along a forward direction;

determine IMU orientation parameters using measurements from the IMU;

estimate motion of the mobile vehicle using the spectrum parameters, the IMU orientation parameters, measurements from the IMU, and a motion estimation function; and

deactivate information conveyed to a user in response to the spectrum parameters of the mobile vehicle being below the cutoff frequency range.

12. The medium of claim 11, wherein the instructions to estimate motion include instructions executable to estimate energy of vibrations below a threshold frequency.

13. The medium of claim 12, wherein the instructions to estimate an energy of vibrations below a threshold frequency include instructions executable to select a maximum amplitude in a selected frequency band.

14. The medium of claim 12, wherein the instructions to estimate the energy of vibrations below the threshold frequency include instructions executable to integrate amplitude over a selected frequency band.