US 12,465,254 B2
Incabin sensor for predicting driver state using radar and driver state predicting method
Sung Kuk Choi, Yongin-si (KR); and Kwan Su Kang, Seoul (KR)
Assigned to THINK-I CO., LTD., Yongin-si (KR)
Filed by THINK-I CO., LTD., Yongin-si (KR)
Filed on Aug. 30, 2024, as Appl. No. 18/820,628.
Claims priority of application No. 10-2023-0124058 (KR), filed on Sep. 18, 2023.
Prior Publication US 2025/0090062 A1, Mar. 20, 2025
Int. Cl. A61B 5/18 (2006.01); A61B 5/00 (2006.01); A61B 5/0205 (2006.01); A61B 5/05 (2021.01)
CPC A61B 5/18 (2013.01) [A61B 5/0205 (2013.01); A61B 5/05 (2013.01); A61B 5/7246 (2013.01); A61B 5/7275 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A driver state predicting method of an in-cabin safety sensor, comprising:
an operation of scanning, by a radar module, a driver using radar signal and outputting at least one of heartbeat signals tracking heartbeats of the driver and respiratory signals tracking respiration of the driver;
an operation of counting, by a state determination unit, at least one of a heart rate per minute using the heartbeat signals and a respiratory rate per minute using the respiratory signals provided by the radar module in real time;
an operation of calculating, by the state determination unit, an average heart rate, which is an average value of the heart rates per minute obtained in the operation of counting for a previous time, and using the average heart rate as a reference heart rate, or calculating an average respiratory rate, which is an average value of the respiratory rates per minute obtained in the operation of counting for the previous time, and using the average respiratory rate as a reference respiratory rate; and
a vital signal analysis operation of determining, by the state determination unit, that the driver is in a preliminary drowsy state, indicating that the driver is entering a drowsy state when the number of times the heart rate per minute counted in real time falls between a first threshold percentage and a second threshold percentage of the reference heart rate is repeated a preset number of times or more within a preset time, or determining that the driver is in the preliminary drowsy state when the number of times the respiratory rate per minute counted in real time falls between a first threshold percentage and a second threshold percentage of the reference respiratory rate is repeated a preset number of times or more within a preset time, wherein the first threshold percentage and the second threshold percentage are less than 100%, and the second threshold percentage is greater than the first threshold percentage.