Wearable device and system for monitoring physical behavior of a vehicle operator
A system uses a wearable electronic device to monitoring behavior of an operator of a vehicle. The wearable device is worn on the head of the operator of the vehicle and includes one or more motion sensors. A processor of the wearable device or of a proximate portable electronic device receives data from the one or more motion sensors and detects a pattern of motion based on the data. The system then may determine a physiological state or physical behavior of the driver based on the detected patterns or motion. Detected physiological states may include head bobs associated with sleepiness. Detected physical behaviors may include dangerous behaviors such as phone usage, prolonged gazes, sudden lane changes, or hard braking or steering.
1. A system for monitoring behavior of an operator of a vehicle, comprising:
a wearable electronic device configured to be worn on the head of an operator of the vehicle, wherein the wearable electronic device comprises a motion sensor; a processor; and
a non-transitory computer-readable medium containing programming instructions that, when executed by the computer, cause the processor to:
receive a first set of data from the motion sensor,
analyze the first set of data to detect a pattern of motion that comprises a head rotational motion of the operator of the vehicle by:
determining a forward-facing direction position as a position corresponding to the most common orientation of the wearable device,
determining, based on the first set of data from the motion sensor, angular displacement of the operator's head, and
determining whether the angular displacement corresponds to a phone usage event, wherein the phone usage event remained constant for at least a threshold period of time,
access a data set corresponding to a plurality of patterns of motion,
use the data set corresponding to the plurality of patterns of motion to analyze the detected pattern of motion and determine a physical behavior of the operator of the vehicle based on the detected pattern of motion by determining that the operator exhibited dangerous operator behavior if the system detected a phone usage event for at least a threshold period of time, and
generate an alert if the determined physical behavior corresponds to a dangerous operator behavior.
2. The system of claim 1 , further comprising a reference device that is attached to the vehicle and that includes:
a transmitter, and
a reference device motion sensor that is configured to collect a second set of data corresponding to motion of the vehicle.
3. The system of claim 2 , wherein the instructions are further configured to cause the processor to:
receive the second set of data from the transmitter; and
determine that the physical behavior also corresponds to a hard braking event if:
the first set of data indicates that the motion sensor of the wearable electronic device is experiencing a negative acceleration above a threshold value, and
at the same time, the second set of data also indicates that the motion sensor of the reference device is experiencing a negative acceleration above a threshold value.
4. The system of claim 2 , wherein the instructions are further configured to cause the processor to:
receive the second set of data from the transmitter; and
determine that the physical behavior also corresponds to a sudden lane change event if:
the first set of data indicates that the motion sensor of the wearable electronic device is experiencing a rate of change of direction in a z-plane relative to the earth exceeding a threshold value within a threshold time, and
at the same time, the second set of data also indicates that the motion sensor of the reference device is experiencing is experiencing a rate of change of direction in the z-plane relative to the earth exceeding the threshold value within the threshold time.
5. The system of claim 2 , wherein the instructions are further configured to cause the processor to:
receive the second set of data from the transmitter,
analyze a derivative of the first set of data and the second set of data, and
determine that the physical behavior also corresponds to a hard steering event if the derivative has a value that exceeds a threshold.
6. The system of claim 1 , wherein the wearable electronic device also comprises a housing, and the first processor and the non-transitory computer-readable medium are included within the housing.
7. The system of claim 1 , further comprising a portable electronic device having a receiver, and wherein:
the wearable electronic device comprises a transmitter configured to transmit the first set of data to the receiver of the portable electronic device; and
the processor and the non-transitory computer-readable medium are included within the portable electronic device.
8. A method for monitoring behavior of an operator of a vehicle, comprising, by a processor:
receiving, from a motion sensor of a wearable electronic device, a first set of data associated with movement of the head of an operator of the vehicle wearing the wearable electronic device;
analyzing the first set of data to detect a pattern of motion that comprises a head rotational motion of the operator of the vehicle by:
determining a forward-facing direction position as a position corresponding to the most common orientation of the wearable device,
determining, based on the first set of data from the motion sensor, angular displacement of the operator's head, and
determining whether the angular displacement corresponds to a phone usage event, wherein the phone usage event remained constant for at least a threshold period of time;
accessing a data set corresponding to a plurality of patterns of motion;
using the data set corresponding to the plurality of patterns of motion to analyze the detected pattern of motion and determining that the operator exhibited dangerous operator behavior if the system detected a phone usage event for at least a threshold period of time; and
generating an alert if the system determined that the operator exhibited dangerous operator behavior.
9. The method of claim 8 , further comprising collecting a second set of data corresponding to motion of the vehicle using a reference device motion sensor of a reference device that is attached to the vehicle.
10. The method of claim 9 , further comprising:
receiving, at the processor, the second set of data from a transmitter of the reference device; and
determining that the physical behavior also corresponds to a hard braking event if:
the first set of data indicates that the motion sensor of the wearable electronic device is experiencing a negative acceleration above a threshold value, and
at the same time, the second set of data also indicates that the reference motion sensor is experiencing a negative acceleration above a threshold value.
11. The method of claim 9 , further comprising:
receiving, at the processor, the second set of data from a transmitter of the reference device; and
determining that the physical behavior also corresponds to a sudden lane change event if:
the first set of data indicates that the motion sensor of the wearable electronic device is experiencing a rate of change of direction in a z-plane relative to the earth exceeding a threshold value within a threshold time, and
at the same time, the second set of data also indicates that the reference motion sensor is experiencing is experiencing a rate of change of direction in the z-plane relative to the earth exceeding the threshold value within the threshold time.
12. The method of claim 9 , further comprising, by the processor:
receiving the second set of data from a transmitter of the reference device,
analyzing a derivative of the first set of data and the second set of data, and determining that the physical behavior also corresponds to a hard steering event if the derivative has a value that exceeds a threshold.