Method and apparatus for body impact protection

1. A system comprising:

a first orientation sensor configured to detect three-dimensional torso motion over time of a torso of a rider of a vehicle or animal, the first orientation sensor comprising:

a multiaxial accelerometer configured to detect acceleration in at least three mutually orthogonal directions, and

a gyroscope;

a second orientation sensor configured to detect three-dimensional motion of a vehicle frame of the vehicle or an animal torso of the animal; and

a controller configured to receive data from the first orientation sensor and the second orientation sensor, the controller being programmed to process the data to:

compare the three-dimensional torso motion detected by the first orientation sensor to the three-dimensional motion detected by the second orientation sensor over a period of time,

identify a degree of variation over time between the three-dimensional torso motion detected by the first orientation sensor and the three-dimensional motion detected by the second orientation sensor, and

determine whether the degree of variation over time between the three-dimensional torso motion detected by the first orientation sensor and the three-dimensional motion detected by the second orientation sensor is within a programmed limit of the degree of variation; and

a body impact protection device comprising an inflator and an inflatable airbag;

wherein, when the controller determines that the degree of variation over time between the three-dimensional torso motion detected by the first orientation sensor and the three-dimensional motion detected by the second orientation sensor is outside the programmed limit of the degree of variation, the controller sends a signal to the body impact protection device to cause the actuator to inflate the inflatable airbag.

2. The system of claim 1 , wherein the controller is further configured to process the data to:

identify parameters for the motion of the vehicle frame or animal torso, and

determine the allowable degree of variation based on the parameters for the motion of the vehicle frame or animal torso.

3. The system of claim 1 , wherein the first orientation sensor is further configured to detect pitch, roll, and yaw of the torso of the rider.

4. The system of claim 1 , wherein the first orientation sensor is further configured to detect an acceleration of each of pitch, roll, and yaw of the torso of the rider.

5. The system of claim 1 , wherein the first orientation sensor is further configured to detect a velocity of each of pitch, roll, and yaw of the torso of the rider.

6. The system of claim 1 , wherein the first orientation sensor is further configured to detect a total acceleration of the torso of the rider.

7. The system of claim 1 , wherein the first orientation sensor is further configured to detect a trajectory of the torso of the rider referenced to gravity.

8. The system of claim 1 , wherein the first orientation sensor comprises an inertial measurement unit.

9. The system of claim 1 , wherein the first orientation sensor further comprises a magnetic field sensor.

10. The system of claim 1 , wherein the second orientation sensor comprises a multiaxial accelerometer, a gyroscope, and a magnetic field sensor.

11. The system of claim 1 , wherein the second orientation sensor is further configured to detect an acceleration of each of pitch, roll, and yaw of the vehicle frame or animal torso.

12. The system of claim 1 , wherein the second orientation sensor is further configured to detect a velocity of each of pitch, roll, and yaw of the vehicle frame or animal torso.

13. The system of claim 1 , wherein the second orientation sensor is further configured to detect a total acceleration of the vehicle frame or animal torso.

14. The system of claim 1 , wherein the second orientation sensor is further configured to detect a trajectory of the vehicle frame or animal torso.

15. The system of claim 1 , wherein the second orientation sensor comprises an inertial measurement unit.

16. The system of claim 1 , wherein the second orientation sensor comprises at least one of a triaxial accelerometer, a gyroscope, and a magnetic field sensor.

17. The system of claim 1 , wherein at least one of the first orientation sensor and the second orientation sensor is configured for wireless communication with the controller.

18. The system of claim 1 , wherein the system comprises a plurality of first orientation sensors, including the first orientation sensor recited in claim 1 , each of the first orientation sensors being configured to detect three-dimensional torso motion over time of the rider, each configured for placement at a different location on the torso.

19. The system of claim 1 , wherein:

the controller is further programmed to determine whether orientations, attitudes, rotational accelerations, trajectories, oscillations, or other motions of the first and/or second orientation sensors are inconsistent with programmed parameters for normal driving of the vehicle or riding of the animal, and

when the controller determines that the orientations, attitudes, rotational accelerations, trajectories, oscillations, or other motions of the first and/or second orientation sensors are inconsistent with programmed parameters for normal driving of the vehicle or riding of the animal, the controller sends a signal to the body impact protection device to cause the actuator to inflate the inflatable airbag.

20. The system of claim 19 , wherein the controller is programmed to distinguish between (i) a normal dismount of the rider from the vehicle or animal from (ii) motion associated with a fall or ejection of the rider from the vehicle or animal.