US Patent 7852194 Vehicle electronic key system
Patent 7852194 was granted and assigned to Honda on December, 2010 by the United States Patent and Trademark Office.
All edits
To ensure a perform authentication based on a request signal Sr which is the authorized radio signal even under a bad radio environment in which radio noise comes continuously. A portable device receives a request signal Sr transmitted from a vehicle-mounted device and transmits an answer signal including a receiving-sensitivity changing switch for changing a receiving sensitivity of a receiving circuit which receives the request signal Sr. As a result, even if the authentication cannot be carried out with normal receiving sensitivity due to the influence of the continuous radio noise, by changing the receiving sensitivity to low sensitivity, and by bringing the portable device physically close to a transmission source of the request signal which is the authorized radio signal, it is possible to dramatically increase the probability that the authentication based on the authorized radio signal can be carried out.
US Patent 07852194 Vehicle electronic key system US Patent 7852194 Vehicle electronic key system
US Patent 07852194 Vehicle electronic key system
Find more entities like US Patent 7852194 Vehicle electronic key system
