Head lowering and turning reminding device, control method thereof and helmet

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.