Vehicle on-board unit

• US 20070083296A1
• Filed: 10/11/2005
• Published: 04/12/2007
• Est. Priority Date: 10/11/2005
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Technical Center North America Incorporated (Nissan Motor Co., Ltd.)
• Inventors: Heft, Ronald, Tengler, Steve
• Granted Patent: US 7,433,773 B2
• Time in Patent Office: Days
• US Class Current: 701/1
• CPC Class Codes: G08G 1/096716 where the received information does not generate an automatic action on the vehicle control
• CPC Class Codes: G08G 1/096791 where the origin of the information is another vehicle
• CPC Class Codes: G08G 1/163 involving continuous checking

Abstract

A vehicle on-board unit comprises a short range wireless broadcasting section, a vehicle identifier receiving section, a vehicle identifier counting section and a communication congestion determining section. The short range wireless broadcasting section is configured to broadcast a host vehicle identifier of a host vehicle equipped with the vehicle on-board unit. The vehicle identifier receiving section is configured to receive neighboring vehicle identifiers relating to neighboring vehicles located within a prescribed communication region around the host vehicle. The vehicle identifier counting section is configured to determine a number of the neighboring vehicle identifiers received by the vehicle identifier receiving section within a prescribed period of time. The communication congestion determining section is configured to determine a congestion condition of short range wireless communications within the prescribed communication region based on the number of the neighboring vehicle identifiers determined in the vehicle identifier counting section.

Claims

1. A vehicle on-board unit comprising:

a short range wireless broadcasting section configured to broadcast a host vehicle identifier of a host vehicle equipped with the vehicle on-board unit;

a vehicle identifier receiving section configured to receive neighboring vehicle identifiers relating to neighboring vehicles located within a prescribed communication region around the host vehicle;

a vehicle identifier counting section configured to determine a number of the neighboring vehicle identifiers received by the vehicle identifier receiving section within a prescribed period of time; and

a communication congestion determining section configured to determine a congestion condition of short range wireless communications within the prescribed communication region based on the number of the neighboring vehicle identifiers determined in the vehicle identifier counting section.

2. The vehicle on-board unit as recited in claim 1, further comprising

a display section configured and arranged to display the congestion condition determined by the communication congestion determining section.

3. The vehicle on-board unit as recited in claim 2, wherein

the display section includes a congestion condition icon that uses different colors for indicating the congestion condition depending on the congestion condition determined by the communication congestion determining section.

4. The vehicle on-board unit as recited in claim 3, wherein

the display section is further configured and arranged to selectively display the congestion condition icon with a first color when the congestion condition is such that the number of the neighboring vehicle identifiers is smaller than a first threshold value and with a second color when the congestion condition is such that the number of the neighboring vehicle identifiers is equal to or greater than the first threshold value.

5. The vehicle on-board unit as recited in claim 4, wherein

the display section is further configured and arranged to selectively display the congestion condition icon with the second color when the congestion condition is such that the number of the neighboring vehicle identifiers is smaller than a second threshold value that is larger than the first threshold value, and with a third color when the congestion condition is such that the number of the neighboring vehicle identifiers is equal to or greater than the second threshold value.

6. The vehicle on-board unit as recited in claim 2, wherein

the display section is configured and arranged to constantly display the congestion condition determined by the communication congestion determining section while the display section is turned on.

7. The vehicle on-board unit as recited in claim 2, wherein

the display section is configured and arranged to display the congestion condition determined by the communication congestion determining section upon a request by a user of the vehicle on-board unit.

8. The vehicle on-board unit as recited in claim 2, wherein

the display section includes a plurality of congestion condition bars for indicating the congestion condition so that a number of the congestion condition bars displayed varies depending on the congestion condition determined by the communication congestion determining section.

9. The vehicle on-board unit as recited in claim 1, wherein

the vehicle identifier receiving section is configured to receive physical hardware addresses relating to the neighboring vehicles as the neighboring vehicle identifiers.

10. The vehicle on-board unit as recited in claim 1, wherein

the vehicle identifier receiving section is configured to receive Medium Access Control addresses of vehicle on-board units mounted to the neighboring vehicles as the neighboring vehicle identifiers.

11. The vehicle on-board unit as recited in claim 1, further comprising

a system diagnosing section configured to determine a system failure when the number of the neighboring vehicle identifiers determined in the vehicle identifier counting section exceeds a prescribed number for a prescribed diagnostic period.

12. The vehicle on-board unit as recited in claim 6, wherein

the display section includes a congestion condition icon that uses different colors for indicating the congestion condition depending on the congestion condition determined by the communication congestion determining section.

13. The vehicle on-board unit as recited in claim 12, wherein

the display section is further configured and arranged to selectively display the congestion condition icon with a first color when the congestion condition is such that the number of the neighboring vehicle identifiers is smaller than a first threshold value and with a second color when the congestion condition is such that the number of the neighboring vehicle identifiers is equal to or greater than the first threshold value.

14. The vehicle on-board unit as recited in claim 13, wherein

the display section is further configured and arranged to selectively display the congestion condition icon with the second color when the congestion condition is such that the number of the neighboring vehicle identifiers is smaller than a second threshold value that is larger than the first threshold value, and with a third color when the congestion condition is such that the number of the neighboring vehicle identifiers is equal to or greater than the second threshold value.

15. The vehicle on-board unit as recited in claim 14, wherein

the vehicle identifier receiving section is configured to receive physical hardware addresses relating to the neighboring vehicles as the neighboring vehicle identifiers.

16. The vehicle on-board unit as recited in claim 14, wherein

the vehicle identifier receiving section is configured to receive Medium Access Control addresses of vehicle on-board units mounted to the neighboring vehicles as the neighboring vehicle identifiers.