Hydroplaning determination device

A hydroplaning determination device that determines hydroplaning of a vehicle, the hydroplaning determination device comprising:

• a tire mount sensor for mounting to a rear surface of a tire provided on the vehicle, the tire mount sensor configured to:
• generate a detection signal according to a magnitude of vibration of the tire;
• generate vibration data based on the detection signal;
• and
• transmit the vibration data;
• and
• a vehicle body system including a receiver and a control unit, the vehicle body system configured to:
• receive the vibration data transmitted from the tire mount sensor;
• determine, based on the vibration data, that a water film exists between the tire and a road surface;
• determine, based on the vibration data, that hydroplaning has occurred, in response to the water film existing between the tire and the road surface;
• and
• acquire a speed of the vehicle,
• a time point when a portion of the tire corresponding to a mounting position of the tire mount sensor contacts the road surface is defined as a contact start time,
• a time point when the portion of the tire corresponding to the mounting position of the tire mount sensor separates from the road surface is defined as a contact end time,
• the vibration data includes data related to one peak waveform in the detection signal at the contact start time and data related to one peak waveform in the detection signal at the contact end time, and
• the receiver is further configured to determine that hydroplaning has occurred in response to (i) an absolute value of a peak value of the one peak waveform in the detection signal at the contact start time being less than a determination threshold, or (ii) an absolute value of a peak value of the one peak waveform in the detection signal at the contact end time being less than the determination threshold.