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:
Apr. 22, 2003
Filed:
Jun. 09, 1999
Hiroki Okada, Toyota, JP;
Keiji Yamamoto, Okazaki, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
In a vehicle control system that is able to accurately recognize an approaching user, excessive detection operations are suppressed to reduce battery consumption. Control is performed at an optimum timing as desired by a user. The vehicle has a controller for forming a large area, using low power electromagnetic radiation. Within the large area, a large area ID request signal can be received. When a portable transceiver enters the large area and returns a response ID in reply to the large area ID request signal back to the controller of the vehicle, the controller then forms a plurality of small areas in which a small area ID request signal for detailed detection can be received. When it is confirmed that the portable transceiver entered any of the small areas, the controller unlocks the vehicle door associated with that small area, allowing the user to enter the vehicle.