Monitoring respiration of a vehicle operator

• US 10,308,257 B2
• Filed: 05/01/2017
• Issued: 06/04/2019
• Est. Priority Date: 05/01/2017
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Kundu, Subrata Kumar
• Primary Examiner(s): Beaulieu, Yonel
• Application Number:
  US15/582,809
• Publication Number:
  US 20180312167A1
• Time in Patent Office: 764 Days
• CPC Class Codes: A61B 2503/22 Motor vehicles operators, e.g. drivers, pilots, captains
• CPC Class Codes: A61B 2562/0214 Capacitive electrodes
• CPC Class Codes: A61B 5/0004 characterised by the type of physiological signal transmitted
• CPC Class Codes: A61B 5/053 Measuring electrical impedance or conductance of a portion of the body
• CPC Class Codes: A61B 5/0803 Recording apparatus specially adapted therefor
• CPC Class Codes: A61B 5/0809 by impedance pneumography
• CPC Class Codes: A61B 5/0816 Measuring devices for examining respiratory frequency measuring frequency of electric signals G01R23/00
• CPC Class Codes: A61B 5/1135 by monitoring thoracic expansion
• CPC Class Codes: A61B 5/6893 Cars
• CPC Class Codes: A61B 5/7278 Artificial waveform generation or derivation, e.g. synthesising signals from measured signals A61B5/327 takes precedence
• CPC Class Codes: A61B 5/7282 Event detection, e.g. detecting unique waveforms indicative of a medical condition A61B5/4094, A61B5/4818, A61B5/349, A61B5/0823 take precedence
• CPC Class Codes: B60K 28/06 responsive to incapacity of driver
• CPC Class Codes: B60W 2040/0872 Driver physiology
• CPC Class Codes: B60W 2540/221 Physiology, e.g. weight, heartbeat, health or special needs
• CPC Class Codes: B60W 2540/26 Incapacity
• CPC Class Codes: B60W 30/06 Automatic manoeuvring for parking
• CPC Class Codes: B60W 40/08 related to drivers or passengers
• CPC Class Codes: B60W 60/0051 from occupants to vehicle
• CPC Class Codes: B60Y 2302/05 Leading to automatic stopping of the vehicle
• CPC Class Codes: B62D 1/046 Adaptations on rotatable parts of the steering wheel for accommodation of switches
• CPC Class Codes: G05D 1/0055 : with safety arrangements
• CPC Class Codes: G05D 1/0088 : characterized by the autonomous decision making process, e.g. artificial intelligence, predefined behaviours using knowledge based models G06N5/00

Abstract

In some examples, a system may generate an alternating current signal to one of a first sensor electrode or a second sensor electrode. For instance, the first sensor electrode may be associated with a seatbelt and located adjacent to a torso of a vehicle operator of a vehicle. Further, the second sensor electrode may be positioned to be contacted by or otherwise proximate to another body part of the vehicle operator, such as at least one of an arm, hand, leg, or foot of the vehicle operator. The system may receive from the other one of the first sensor electrode or the second sensor electrode, a signal indicative of a capacitance, and may determine a respiration rate of the vehicle operator based at least partially on the signal indicative of the capacitance.

Claims

1. A system comprising:

a first sensor electrode associated with a seatbelt of a vehicle, wherein the first sensor electrode is positioned adjacent to a torso of a vehicle operator;

a second sensor electrode positioned within the vehicle to be proximate to a body part of the vehicle operator during operation of the vehicle;

a capacitance-to-voltage converter that converts a capacitance signal received from one of the first sensor electrode or the second sensor electrode to a voltage signal;

one or more processors; and

one or more non-transitory computer-readable media maintaining executable instructions, which, when executed by the one or more processors, cause the one or more processors to perform operations comprising;

receiving the voltage signal from the capacitance-to-voltage converter; and

determining a respiration rate of the vehicle operator based at least partially on measuring an amplitude and period of the voltage signal.

2. The system as recited in claim 1, wherein the second sensor electrode is located on at least one of:

a steering wheel of the vehicle;

an armrest of the vehicle;

a shift lever of the vehicle;

a foot pedal of the vehicle;

or

an upper surface of a bottom seat cushion of the vehicle.

3. The system as recited in claim 1, wherein the second sensor electrode is located on a steering wheel of the vehicle, and further comprises at least one electrode embedded in a portion of a rim of the steering wheel and covered by an insulating material.

4. The system as recited in claim 1, wherein the first sensor electrode is at least one of:

connected to or integral with a lap belt portion of the seatbelt;

connected to or integral with a shoulder belt portion of the seatbelt;

or

connected to both the lap belt portion and the shoulder belt portion of the seatbelt, and spanning an area there between.

5. The system as recited in claim 1, further comprising a signal generator for generating an alternating current signal to one of the first sensor electrode or the second sensor electrode.

6. The system as recited in claim 1, the operations further comprising:

determining a respiration pattern based on the respiration rate;

determining that the respiration pattern is abnormal; and

sending at least one of a control signal or a communication based at least partially on determining that the respiration pattern is abnormal.

7. A method comprising:

generating an alternating current signal to one of a first sensor electrode or a second sensor electrode, wherein the first sensor electrode is associated with a seatbelt and located adjacent to a torso of a vehicle operator of a vehicle, and the second sensor electrode is positioned to be proximate to at least one of an arm, hand, leg, or foot, of the vehicle operator;

receiving from the other one of the first sensor electrode or the second sensor electrode, a signal indicative of a capacitance; and

determining, by a processor, a respiration rate based at least partially on the signal indicative of the capacitance,

wherein there are multiple second sensor electrodes, the method further comprising;

determining that the vehicle operator is contacting a certain one of the second sensor electrodes;

determining that the vehicle operator has contacted the certain second sensor electrode for a threshold time; and

receiving the signal indicative of the capacitance from the certain second sensor electrode.

8. The method as recited in claim 7, further comprising:

determining a respiration pattern based on the respiration rate;

determining that the respiration pattern is abnormal; and

performing at least one action based at least partially on determining that the respiration pattern is abnormal.

9. The method as recited in claim 8, wherein performing at least one action based at least partially on determining that the respiration pattern is abnormal comprises sending a control signal to cause the vehicle to at least one of park the vehicle, or drive the vehicle autonomously or semi-autonomously.

10. The method as recited in claim 7, wherein performing at least one action based at least partially on determining that the respiration pattern is abnormal comprises sending a communication to a service computing device over a network.

11. The method as recited in claim 7, further comprising:

converting the signal indicative of the capacitance into a voltage signal; and

measuring an amplitude and period of the voltage signal to determine at least partially the respiration rate.

12. The method as recited in claim 7, further comprising:

storing the respiration rate as respiration data; and

sending the respiration data over a network to a computing device.

13. An apparatus comprising:

a first sensor electrode associated with a seatbelt for restraining a vehicle operator of a vehicle;

a second sensor electrode positioned within the vehicle to be proximate to a body part of the vehicle operator;

a signal generator that generates a signal to one of the first sensor electrode or the second sensor electrode;

a capacitance-to-voltage converter that converts a capacitance signal received from the other one of the first sensor electrode or the second sensor electrode to a voltage signal; and

a voltage measurement circuit that determines, at least in part, a respiration rate based on an amplitude and period of the voltage signal received from the capacitance-to-voltage converter.

14. The apparatus as recited in claim 13, further comprising a processor, wherein the voltage measurement circuit is included in or is associated with the processor, the processor configured by executable instructions to determine, at least in part, the respiration rate, and to further determine, at least in part, a respiration pattern based on the respiration rate.

15. The apparatus as recited in claim 13, further comprising a memory and a transceiver, wherein the respiration rate is stored in the memory and sent by the transceiver over a wireless network to a computing device.

16. The apparatus as recited in claim 13, wherein the first sensor electrode is at least one of:

connected to or integral with a lap belt portion of the seatbelt;

connected to or integral with a shoulder belt portion of the seatbelt;

or

connected to both the lap belt portion and the shoulder belt portion of the seatbelt, and spanning an area there between.

17. The apparatus as recited in claim 13, wherein the second sensor electrode is located on at least one of:

a steering wheel of the vehicle;

an armrest of the vehicle;

a shift lever of the vehicle;

a foot pedal of the vehicle;

or

an upper surface of a bottom seat cushion of the vehicle.

18. The apparatus as recited in claim 13, wherein the second sensor electrode is located on a steering wheel of the vehicle, and further comprises at least one electrode embedded in a portion of a rim of the steering wheel and covered by an insulating material.