US 12,337,778 B2
Device for detecting the presence of an occupant inside the passenger compartment of a vehicle
Pierre Sabournin, Ecquevilly (FR)
Assigned to Autoliv Development AB, Vårgårda (SE)
Appl. No. 17/057,896
Filed by AUTOLIV DEVELOPMENT AB, Vargarda (SE)
PCT Filed May 21, 2019, PCT No. PCT/EP2019/063057
§ 371(c)(1), (2) Date Nov. 23, 2020,
PCT Pub. No. WO2019/224177, PCT Pub. Date Nov. 28, 2019.
Claims priority of application No. 1854463 (FR), filed on May 25, 2018.
Prior Publication US 2021/0206334 A1, Jul. 8, 2021
Int. Cl. B60R 21/015 (2006.01); B62D 1/04 (2006.01); B62D 1/06 (2006.01)
CPC B60R 21/01532 (2014.10) [B60R 21/01552 (2014.10); B62D 1/046 (2013.01); B62D 1/06 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A capacitive device in a motor vehicle for detecting the presence of an occupant inside the vehicle, said device comprising
a first electrode separated from a second electrode by a dielectric material so as to form a capacitive sensor, said capacitive sensor being arranged on a surface of a component of the vehicle,
a voltage generator arranged to generate an AC voltage between said first and second electrodes,
a current measurement circuit arranged to detect a current between the second electrode and an exposed conductive part of the vehicle, the presence of said occupant near said component being a function of the detected current, wherein the current measurement circuit is configured to only receive current when said occupant is near said component,
a first capacitor electrically connected in series with the first electrode, and
a second capacitor electrically connected in series with the second electrode.