The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 06, 2024
Filed:
Jan. 28, 2022
Denso Corporation, Kariya, JP;
Ryozou Fujii, Kariya, JP;
DENSO CORPORATION, Kariya, JP;
Abstract
A portable device transmits wirelessly pilot signals of a plurality of frequencies sequentially at predetermined time intervals. Upon receiving the pilot signals, the in-vehicle device determines whether a slope of a straight line obtained by linearly approximating a time and a reception signal strength of each of the pilot signals is equal to or less than a predetermined slope threshold value. In response to a predetermined allowable condition including the slope being determined to be equal to or less than the slope threshold value being satisfied, a distance between the portable device and the in-vehicle device obtained by a distance measurement process is specified as a high reliability distance. In response to the predetermined allowable condition being not satisfied, the distance obtained by the distance measurement process is prevented from being specified as the high reliability distance or the distance measurement process is prevented from being executed.