Onboard device and vehicle anti-theft system

Patent metadata

Field	Value
Publication number	US-9555771-B2
Application number	US-201314435374-A
Country	US
Kind code	B2
Filing date	Sep 27, 2013
Priority date	Oct 17, 2012
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

This onboard device measures the received power of radio waves transmitted from a base station while the engine is running and sets a near-out-of-range flag when the level of the received power has become equal to or lower than a near-out-of-range level, which indicates the possibility of going out of range. The onboard device permits a portable terminal device to obtain a new effective period for a key ID when the radio wave environment of a vehicle when the engine is stopped indicates that the vehicle is out of range, and the effective period of the key ID has expired and needs to be renewed, provided that the near-out-of-range flag has been set. Consequently, security can be enhanced during acquisition of update information for the key information with the portable terminal device.

First claim

What is claimed is:

1. A vehicle onboard device comprising:
a vehicular communicator configured to communicate with a server through a mobile communication network and measuring received power of a radio wave transmitted from a base station of the mobile communication network;
a collation controller configured to store a key information that is required to be updated in each expiration date and providing a start permission that changes a power unit of a vehicle from a stopped state to an operating state when a received key information that has been transmitted from an apparatus other than the vehicle and is received by the vehicle onboard device is collated with the key information stored in the collation controller and the received key information is matched with the key information stored in the collation controller, and when the key information satisfies an expiration date; and
a short range communicator of the vehicle configured to perform short range communication with a mobile terminal device, the mobile terminal device being registered in advance in the collation controller and communicable with the server through the mobile communication network, wherein
during an operation of the power unit, the collation controller sets an outside-range approach flag when the received power measured by the vehicular communicator is equal to or less than a near-marginal level, and the collation controller resets the outside-range approach flag when the received power is higher than the near-marginal level,
the near-marginal level is set higher than a marginal level by a predetermined permissible value, the marginal level corresponding to a minimum received power level required for communication between the base station of the mobile communication network and the vehicular communicator,
during a stopping of the power unit, the collation controller permits the mobile terminal device to communicate with the server and to acquire a key information update information when the vehicular communicator is positioned in an outside range being incapable of a communication between the vehicular communicator and the base station of the mobile communication network, the key information needs to be updated, and the outside-range approach flag is set, and
the collation controller receives the key information update information acquired from the mobile terminal device through the short range communicator and updates the key information.

2. The vehicle onboard device according to claim 1 , wherein
the collation controller determines that a security risk is high when the key information needs to be updated in the outside range and the outside-range approach flag is reset while the power unit stops, and
the collation controller inhibits the short range communicator from communicating with the mobile terminal device.

3. The vehicle onboard device according to claim 1 , wherein
the collation controller determines that a security risk is high when the received power measured by the vehicular communicator decreases from a value higher than the near-marginal level to a value equal to or lower than the marginal level or increases from a value equal to or lower than the marginal level to a value higher than the near-marginal level while the power unit stops.

4. The vehicle onboard device according to claim 2 , wherein
the collation controller increases a sensitivity of a security device mounted to the vehicle when the collation controller determines that the security risk is high.

5. A vehicle anti-theft system comprising:
a server connected to a mobile communication network;
the vehicle onboard device according to claim 1 that is communicable with the server through the mobile communication network; and
a mobile terminal device registered in advance and communicable with the server through the mobile communication network and capable of short range communication with the vehicle onboard device, wherein
the mobile terminal device receives key information update information from the server when the vehicle onboard device permits the mobile terminal device to communicate with the server and to acquire the key information update information and the mobile terminal device is positioned in an inside range capable of communication with a base station of the mobile communication network, and
the mobile terminal device transmits the key information update information to the vehicle onboard device.

6. The vehicle anti-theft system according to claim 5 , wherein
a collation controller of the vehicle onboard device transmits an outside-range approach flag to the server while a power unit operates, and
the server transmits the key information update information to the mobile terminal device when the outside-range approach flag is set.

7. The vehicle anti-theft system according to claim 5 , wherein
a collation controller of the vehicle onboard device stores a received power data measured by a vehicular communicator of the vehicle onboard device and a vehicle speed data while the power unit operates and an outside-range approach flag is set,
the collation controller transmits the stored received power data and the stored vehicle speed data to the mobile terminal device when the collation controller permits the mobile terminal device to acquire the key information update information while the power unit stops,
the mobile terminal device measures received power of a radio wave transmitted from the base station of the mobile communication network and measures a movement speed, stores a received power data and a movement speed data measured from a time when a permission is given until a time when the mobile terminal device communicates with the server, and transmits a data to the server, the data including the received power data and the vehicle speed data measured by the vehicle onboard device, and the received power data and the movement speed data measured by the mobile terminal device,
the server calculates a travel distance traveled after the vehicle onboard device is positioned in an outside range based on the received power data and the vehicle speed data measured by the vehicle onboard device,
the server calculates a moving distance traveled after the mobile terminal device is positioned in the inside range based on the received power data and the movement speed data measured by the mobile terminal device, and
the server transmits the key information update information to the mobile terminal device when a difference between the travel distance and the moving distance is equal to less than an allowable value.

8. The vehicle anti-theft system according to claim 7 , wherein
the collation controller of the vehicle onboard device calculates the travel distance traveled after the vehicle onboard device is positioned in the outside range based on the received power data and the vehicle speed data measured by the vehicle onboard device,
the collation controller transmits the calculated travel distance to the mobile terminal device when the collation controller permits the mobile terminal device to acquire the key information update information, and
the mobile terminal device notifies the received travel distance as the moving distance to the inside range.

9. The vehicle anti-theft system according to claim 8 , wherein
the collation controller of the vehicle onboard device specifies a transportation form for a user carrying the mobile terminal device to move to the inside range according to the calculated travel distance,
the collation controller of the vehicle onboard device transmits the transportation form to the mobile terminal device,
the mobile terminal device receives the transportation form used for moving, and notifies a message indicating the tra

Assignees

• Denso Corp

Inventors

• Oohara Katsuhiro

Classifications

• B60R25/24 Primary

  using electronic identifiers containing a code not memorised by the user · CPC title