Drive information collecting apparatus

• US 20080270021A1
• Filed: 04/21/2008
• Published: 10/30/2008
• Est. Priority Date: 04/25/2007
• Status: Abandoned Application

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Yamada, Kazunao
• Application Number:
  US12/148,663
• Publication Number:
  US 20080270021A1
• Time in Patent Office: Days
• US Class Current: 701/201
• CPC Class Codes: G08G 1/0104 Measuring and analyzing of parameters relative to traffic conditions

Abstract

A drive information collecting apparatus includes position specifying portion, storage control portion, and statistical confidence level storage portion. The position specifying portion specifies a present position of a vehicle and a road section. The storage control portion causes a storage medium to store a drive information item of each of the road section. The drive information item is collected while the vehicle travels. The statistical confidence level storage portion specifies a statistical confidence level based on a divergence between a predetermined reference value and the collected drive information item. The statistical confidence level indicates a degree of variation of the collected drive information item. The statistical confidence level storage portion associates the collected drive information item with the statistical confidence level and causes the storage medium to store the collected drive information item.

Claims

1. A drive information collecting apparatus for a vehicle comprising:

position specifying means for specifying a present position of the vehicle and a road section, on which the vehicle travels;

storage control means for causing a storage medium to store a drive information item of each of the road section, the drive information item being collected while the vehicle travels; and

statistical confidence level storage means for specifying a statistical confidence level based on a divergence between a predetermined reference value and the collected drive information item, the statistical confidence level indicating a degree of variation of the collected drive information item, the statistical confidence level storage means associating the collected drive information item with the statistical confidence level and causing the storage medium to store the collected drive information item.

2. The drive information collecting apparatus according to claim 1, wherein:

the statistical confidence level storage means acquires an average value based on the statistical confidence level of the collected drive information item and a statistical confidence level of a past drive information item stored in the storage medium; and

the statistical confidence level storage means causes the storage medium to store the acquired average value as a new statistical confidence level.

3. The drive information collecting apparatus according to claim 1 further comprising:

position confidence level storage means for specifying a position confidence level indicative of a precision of the present position of the vehicle, the position confidence level storage means associating the position confidence level with the collected drive information item, the position confidence level storage means causing the storage medium to store the position confidence level.

4. The drive information collecting apparatus according to claim 3, wherein:

the position confidence level storage means acquires an average value based on the position confidence level of the collected drive information item and a position confidence level of a past drive information item stored in the storage medium; and

the position confidence level storage means causes the storage medium to store the acquired average value as a new position confidence level.

5. The drive information collecting apparatus according to claim 1, further comprising:

learning database making means for making a learning database that has a plurality of categories of a time zone, the plurality of categories being made in accordance with a characteristic of a traffic flow information item stored in a database of an information center, the traffic flow information item indicating a traffic flow for the road section, wherein;

the storage control means updates the learning database using the collected drive information item.

6. The drive information collecting apparatus according to claim 5, wherein:

the storage control means acquires an average value based on the collected drive information item and a past drive information item stored in the storage medium; and

the storage control means updates the learning database using the acquired average value as a new drive information item.

7. The drive information collecting apparatus according to claim 1, wherein:

the drive information item includes at least one of a vehicle speed, an electric power consumption, a fuel consumption, gear shift lever position information, accelerator pedal position information, an engine rotational speed, a number of times of operating a brake, a road gradient, and a road degree of curve.

8. The drive information collecting apparatus according to claim 5, wherein:

the learning database making means causes the learning database to have additional categories of a day type, the additional categories being made in accordance with the characteristic of the traffic flow information item.

9. The drive information collecting apparatus according to claim 5, wherein:

the traffic flow information item is one of a plurality of traffic flow information items which are collected while a plurality of probe vehicles travel;

when the information center receives the plurality of traffic flow information items, the information center performs statistical processing to the received traffic flow information items and stores a result of the statistical processing in the database.

10. The drive information collecting apparatus according to claim 5, wherein:

the information center generates classification information that has the categories of the time zone in accordance with the characteristic of the traffic flow information item stored in the database; and

the learning database making means acquires the classification information from the information center for making the learning database in accordance with the classification information.

11. A drive information collecting apparatus for a vehicle comprising:

position specifying means for specifying a present position of the vehicle and a road section, on which the vehicle travels;

storage control means for causing a storage medium to store a drive information item of each of the road section, the drive information item being collected while the vehicle travels; and

statistical confidence level storage means for specifying a statistical confidence level based on a divergence between a predetermined reference value and the collected drive information item, the statistical confidence level storage means associating the collected drive information item with the statistical confidence level and causing the storage medium to store the collected drive information item.

12. The drive information collecting apparatus according to claim 11, wherein:

a first provisional statistical confidence level is a degree of variation of the collected drive information item from the predetermined reference value;

a second provisional statistical confidence level is a degree of variation of a past drive information item from the predetermined reference value and is stored in the storage medium;

the statistical confidence level storage means acquires an average value based on the first and second provisional statistical confidence levels; and

the statistical confidence level storage means causes the storage medium to store the acquired average value as the statistical confidence level.

13. The drive information collecting apparatus according to claim 11 further comprising:

position confidence level storage means for specifying a position confidence level indicative of a precision of the present position of the vehicle, the position confidence level storage means associating the position confidence level with the collected drive information item, the position confidence level storage means causing the storage medium to store the position confidence level.

14. The drive information collecting apparatus according to claim 13, wherein:

a first provisional position confidence level is acquired based on the collected drive information item;

a second provisional position confidence level is acquired based on a past drive information item and is stored in the storage medium;

the position confidence level storage means acquires an average value based on the first and second provisional position confidence levels; and

the position confidence level storage means causes the storage medium to store the acquired average value as the position confidence level.

15. The drive information collecting apparatus according to claim 11, wherein:

the statistical confidence level is acquired based on the collected drive information item and indicates a degree of variation of the collected drive information item from the predetermined reference value.

16. The drive information collecting apparatus according to claim 11, wherein:

the position confidence level is acquired based on the collected drive information item.

17. The drive information collecting apparatus according to claim 11, further comprising:

communication control means for communicating with an information center that has a database storing a traffic flow information item, the traffic flow information item indicating a traffic flow for the road section; and

learning database making means for acquiring the traffic flow information item through the communication control means to make a learning database that has a plurality of categories of a time zone, the plurality of categories being made in accordance with a characteristic of the traffic flow information item, wherein;

the storage control means updates the learning database using the collected drive information item.