US 12,248,086 B2
Position estimation device, position estimation system, and position estimation method
Kazuhiro Nakashima, Kariya (JP); and Kenichirou Sanji, Nisshin (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Nov. 8, 2021, as Appl. No. 17/453,978.
Application 17/453,978 is a continuation of application No. PCT/JP2020/019276, filed on May 14, 2020.
Claims priority of application No. 2019-095733 (JP), filed on May 22, 2019.
Prior Publication US 2022/0057475 A1, Feb. 24, 2022
Int. Cl. B60R 25/24 (2013.01); B60R 25/30 (2013.01); E05B 49/00 (2006.01); G01S 5/00 (2006.01); G01S 5/02 (2010.01); G01S 5/10 (2006.01); G01S 13/76 (2006.01); G07C 9/00 (2020.01)
CPC G01S 5/10 (2013.01) [B60R 25/30 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A position estimation device mounted on a vehicle for estimating a position of a portable device carried by a user of the vehicle, the position estimation device comprising: at least one vehicle-side transmission and reception device that transmits and receives a signal to and from the portable device; a distance data acquisition unit that acquires distance data between the portable device and the vehicle-side transmission and reception device using the signal received by the vehicle-side transmission and reception device from the portable device; a movement speed calculation unit that calculates a movement speed of the portable device based on a change between a current distance data that is a currently acquired distance data and a previous distance data that is a distance data acquired before the current distance data;
an update unit that updates a position estimation distance for estimating the position of the portable device with respect to the vehicle using the current distance data when the movement speed is less than a first speed preliminarily determined based on a moving speed range of the user, and does not update the position estimation distance using the current distance data when the movement speed is equal to or higher than the first speed; and a position estimation unit that estimates the position of the portable device with respect to the vehicle using the position estimation distance, wherein the position estimation device is configured to provide remote keyless entry or smart entry for the vehicle such that when the user of the vehicle operates the portable device, a door of the vehicle is opened, closed, unlocked, or locked.