# US 10,482,745 B2 · Head lowering and turning reminding device, control method thereof and helmet

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- Number: US 10,482,745 B2
- Document ID: US10482745B2
- Status: Granted
- Kind: B2
- Application number: 15/542,252
- Filed: 2016-06-17
- Published: 2018-04-19
- Granted: 2019-11-19
- Earliest claimed: 2016-02-25
- Assignees: Boe Technology Group Co., Ltd.
- Applicants: BOE Technology Group Co., Ltd.
- Inventors: Shuo Chen; Xinxin Mu
- Web page: https://patentgrep.com/patent/US10482745B2

## CPC

- G08B 21/0446: {worn on the body to detect changes of posture, e.g. a fall, inclination, acceleration, gait}
- A42B 3/0433: {Detecting, signalling or lighting devices}
- A42B 3/0453: {Signalling devices, e.g. auxiliary brake or indicator lights}
- A42B 3/046: {Means for detecting hazards or accidents}
- A61B 5/11: Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb {(A61B5/1038 takes precedence; motion detection to correct for motion artifacts in physiological signals A61B5/721)}
- G08B 21/182: {Level alarms, e.g. alarms responsive to variables exceeding a threshold}
- G08B 21/24: Reminder alarms, e.g. anti-loss alarms
- G08G 1/052: with provision for determining speed or overspeed {(speed measuring in general G01P)}
- A61B 5/1116: {Determining posture transitions}
- A61B 5/6803: {Head-worn items, e.g. helmets, masks, headphones or goggles}
- A61B 2503/10: Athletes
- G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- A42B: HATS; HEAD COVERINGS (headbands A41D20/00; head-scarves A41D23/00)
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- G08G: TRAFFIC CONTROL SYSTEMS (guiding railway traffic, ensuring the safety of railway traffic B61L; arrangement of road signs or traffic signals E01F9/00; radar or analogous systems, sonar systems, lidar systems specially adapted for traffic control G01S13/91, G01S15/88, G01S17/88; {radar or analogous systems, sonar systems, lidar systems specially adapted for anti-collision purposes G01S13/93, G01S15/93, G01S17/93})

## Abstract

A head lowering and turning reminding device, a control method thereof and a helmet are disclosed. The reminding device is disposed on a vehicle or worn by a user of the vehicle, and includes: a speed sensor configured to detect a ground speed of the vehicle; a head posture monitoring module configured to monitor a head posture of the user and generate a signal relevant to a head rotating action of the user; a recognition module configured to receive the signal and recognize at least one of a head lowering action and a head turning action of the user and a duration time of this action; and an alarm module configured to output an alarm for reminding the user upon the ground speed being greater than a speed threshold and the duration time exceeding a preset time threshold.

## Claims

### Claim 1

A head lowering and turning reminding method for a driver of a vehicle, comprising:
S1: acquiring, via a speed sensor, a ground speed of the vehicle, the ground speed being a running velocity Vz of the vehicle in a Z-axis direction;
S2: determining, through a first determination sub-module of an alarm module, whether the running velocity Vz as acquired is greater than a preset speed threshold Vz′;
S3: if the running velocity Vz is greater than the preset speed threshold Vz′, assigning a value 0 to an action continuation parameter n, through a second determination sub-module of the alarm module, and executing the step S4; or else, executing the step S1;
S4: acquiring, through a head posture monitoring module, a head rotation angular velocity ωx of the driver in a X-axis direction, a time tx cost by the head rotation, a head rotation angular velocity ωy of the driver in a Y-axis direction, and a time ty cost by the head rotation;
S5: calculating, through the head posture monitoring module, a head rotation angle θx(t) and a head rotation angle θy(t) of the driver at time t according to θx(t)=∫ωxdt, θy(t)=∫ωydt;
S6: determining, through a recognition module, whether the head rotation angle θx(t) and the head rotation angle θy(t) of the driver at the time t are greater than a preset angle threshold θx′ and a preset angle threshold θy′, respectively; if so, executing the step S7; and if not, executing the step S4;
S7: adding 1 to the value of the action continuation parameter n, through the second determination sub-module of the alarm module;
S8: determining whether the action continuation parameter n is greater than a preset continuation threshold n′, through the second determination sub-module of the alarm module; if so, executing the step S9; and if not, executing the step S4;
S9: acquiring, via the speed sensor, the running velocity Vz of the vehicle in the Z-axis direction again, and determining whether the running velocity Vz is greater than the preset speed threshold Vz′, again through the first determination sub-module of the alarm module; if so, executing the step S10; and if not, executing the step S1; and
S10: outputting, through a prompt sub-module of the alarm module, an alarm for reminding the driver;
S11: sending a first speed control signal to the vehicle, through the recognition module, at the same time when outputting the alarm, through the prompt sub-module of the alarm module, to decelerate the running velocity Vz of the vehicle in the Z-axis direction until the vehicle stops; and
S12: sending a second speed control signal to the vehicle, through the recognition module, to restore an original running velocity Vz of the vehicle in the Z-axis direction if no head lowering or turning action for a duration time exceeding a preset time threshold is detected through S4-S8 after the vehicle stops.

### Claim 2 (depends on 1)

The head lowering and turning reminding method according to claim 1, wherein the head rotating action comprises: a head raising action toviz wherein the head moves upwards, a head lowering action wherein the head moves downwards, and a head turning action wherein the head moves leftwards and rightwards.

### Claim 3 (depends on 1)

The head lowering and turning reminding method according to claim 1, wherein the preset continuation threshold n′ is configured by:
acquiring a time T0 required for executing the steps S3 to S7; and
dividing a preset action duration time by the time T0, and rounding the division result to obtain the preset continuation threshold n′.

### Claim 4 (depends on 1)

The head lowering and turning reminding method according to claim 1, further comprising:
before the step S1, initializing the speed sensor, the head posture monitoring module, and the recognition module.

### Claim 5 (depends on 1)

The head lowering and turning reminding method according to claim 1, wherein, in the step S4, a gyroscope is adopted to acquire the head rotation angular velocity and the time cost by the head rotation.

### Claim 6 (depends on 1)

A head lowering and turning reminding device disposed on a vehicle or worn by a driver of the vehicle, for performing the head lowering and turning reminding method according to claim 1, comprising:
the speed sensor configured to detect the ground speed of the vehicle;
the head posture monitoring module configured to monitor a head posture of the driver and generate a signal relevant to a head rotating action of the driver;
the recognition module configured to receive the signal generated by the head posture monitoring module, and recognize at least one action of a head lowering action and a head turning action of the driver and a duration time of the driver holding this action according to the signal; and
the alarm module configured to output the alarm for reminding the driver upon the ground speed of the vehicle being greater than a speed threshold and the duration time of the driver holding the head lowering action or the head turning action exceeding the preset time threshold, wherein
the recognition module is further configured to send the first speed control signal to the vehicle at the same time when the alarm module outputs the alarm to decelerate the vehicle according to the first speed control signal until the vehicle stops, and, to send the second speed control signal to the vehicle to restore the ground speed of the vehicle if no head lowering or turning action for a duration time exceeding the preset time threshold is detected after the vehicle stops.

### Claim 7 (depends on 6)

The head lowering and turning reminding device according to claim 6, wherein the head posture monitoring module is a gyroscope.

### Claim 8 (depends on 6)

The head lowering and turning reminding device according to claim 6, wherein the head posture monitoring module comprises a compass.

### Claim 9 (depends on 6)

The head lowering and turning reminding device according to claim 6, wherein the speed sensor is a laser velometer or a radar velometer.

### Claim 10 (depends on 6)

The head lowering and turning reminding device according to claim 6, wherein the recognition module is a microcontroller.

### Claim 11 (depends on 6)

The head lowering and turning reminding device according to claim 6, further comprising:
a power module configured to supply power for the speed sensor, the head posture monitoring module, the recognition module, and the alarm module.

### Claim 12 (depends on 6)

A helmet, comprising the head lowering and turning reminding device according to claim 6.

### Claim 13 (depends on 12)

The helmet according to claim 12, wherein the head posture monitoring module is a gyroscope.

### Claim 14 (depends on 12)

The helmet according to claim 12, wherein the head posture monitoring module comprises a compass.

### Claim 15 (depends on 12)

The helmet according to claim 12, wherein the speed sensor is a laser velometer or a radar velometer.

### Claim 16 (depends on 12)

The helmet according to claim 12, wherein the recognition module is a microcontroller.

### Claim 17 (depends on 12)

The helmet according to claim 12, wherein the head lowering and turning reminding device further comprises:
a power module configured to supply power for the speed sensor, the head posture monitoring module, the recognition module, and the alarm module.