Motion detection devices and systems

Patent metadata

Field	Value
Publication number	US-9423318-B2
Application number	US-201414445871-A
Country	US
Kind code	B2
Filing date	Jul 29, 2014
Priority date	Jul 29, 2014
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

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.

First claim

What is claimed:

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.

Assignees

• Honeywell Int Inc

Inventors

• Liu Haiyang
• Baker Jeffrey
• Cunningham Iv Charles Joseph
• Caldwell William Stephen

Classifications

• G07C5/02

  Registering or indicating driving, working, idle, or waiting time only (apparatus forming part of taximeters G07B13/00) · CPC title

• G01P13/00 Primary

  Indicating or recording presence, absence, or direction, of movement (electric switches H01H; counting moving objects G06M7/00) · CPC title

• G01P3/50 Primary

  for measuring linear speed (G01P3/56 takes precedence) · CPC title

• G01M17/007 Primary

  Wheeled or endless-tracked vehicles (G01M17/08 takes precedence) · CPC title