US 12,216,104 B2
In-vehicle abnormality detection device and in-vehicle abnormality detection method
Henrik Rodjegard, Delsbo (SE); and Yuji Goda, Tokyo (JP)
Assigned to Asahi Kasei Microdevices Corporation, Tokyo (JP)
Appl. No. 17/773,108
Filed by ASAHI KASEI MICRODEVICES CORPORATION, Tokyo (JP)
PCT Filed Nov. 5, 2020, PCT No. PCT/JP2020/041409
§ 371(c)(1), (2) Date Apr. 29, 2022,
PCT Pub. No. WO2021/090892, PCT Pub. Date May 14, 2021.
Claims priority of application No. 2019-203314 (JP), filed on Nov. 8, 2019.
Prior Publication US 2022/0373526 A1, Nov. 24, 2022
Int. Cl. G01N 33/00 (2006.01); B60H 1/00 (2006.01)
CPC G01N 33/004 (2013.01) [B60H 1/00742 (2013.01); B60H 1/008 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An in-vehicle abnormality detection device comprising:
a CO2 concentration sensor configured to detect in-vehicle carbon dioxide concentration of a vehicle;
a parked state detection unit configured to detect that the vehicle is in a parked state;
a time constant storage unit configured to store a time constant τ of concentration change of the in-vehicle carbon dioxide concentration;
a change rate estimation unit configured to, on a basis of detection signals C(t1) and C(t2) of the CO2 concentration sensor at two different time points t1 and t2 when the parked state is detected by the parked state detection unit, estimate a change rate of the in-vehicle carbon dioxide concentration at a time point t when the parked state is detected;
a carbon dioxide concentration estimation unit configured to estimate a carbon dioxide concentration estimation value C0 in the vehicle at a time point when a predetermined time has elapsed since the time point t on a basis of a detection signal C(t) of the CO2 concentration sensor at the time point t, the time constant τ stored in the time constant storage unit, and the change rate estimated by the change rate estimation unit; and
an abnormality determination unit configured to determine that there is a detection target organism present in the vehicle when the carbon dioxide concentration estimation value C0 estimated by the carbon dioxide concentration estimation unit is equal to or more than a threshold value set according to the detection target organism.