Traffic information management system
First Claim
1. A traffic information management system comprising:
- a plurality of probe cars, each probe car having an in-vehicle terminal for collecting probe information including a current position and a speed of the each probe car, the in-vehicle terminal includinga transmitter configured to upload the collected probe information anda receiver configured to receive information broadcasted by a broadcasting system; and
a center configured tocommunicate with the each probe car to receive the probe information transmitted from the in-vehicle terminal of the each probe car,generate road traffic information for specifying a road state by analyzing the received probe information, andtransmit the generated road traffic information to the each probe car via the broadcasting system,wherein the in-vehicle terminal further includesa determining unit configured to determine a road state, with respect to each unit road segment included in a plurality of unit road segments traveled by the each probe car, successively in accordance with traveling of the each probe car, anda communications control unit configured to allow the transmitter to transmit, to the center, probe information collected in the each unit road segment, only when a predetermined difference is present in the each unit road segment between (i) the determined road state and (ii) a road state indicated by the traffic information, which is received by the receiver via the broadcasting system.
1 Assignment
0 Petitions
Accused Products
Abstract
A management center analyzes probe information uploaded from an in-vehicle terminal mounted in each of multiple probe cars to thereby generate road traffic information allowing specification of a unit road segment in a congested state. The generated road traffic information is transmitted via a broadcasting station and terrestrial digital broadcasting. Each in-vehicle terminal includes a navigation device. The navigation device determines traffic congestion state relative to multiple unit road segments successively in accordance to traveling of the relevant probe car. Only when confirming a predetermined difference relative to each unit road segment between the determined traffic congestion state and the traffic congestion state indicated in the road traffic information received from the management center, the navigation device uploads to the management center the probe information collected with respect to the corresponding unit road segment by using a mobile communications terminal.
43 Citations
11 Claims
-
1. A traffic information management system comprising:
-
a plurality of probe cars, each probe car having an in-vehicle terminal for collecting probe information including a current position and a speed of the each probe car, the in-vehicle terminal including a transmitter configured to upload the collected probe information and a receiver configured to receive information broadcasted by a broadcasting system; and a center configured to communicate with the each probe car to receive the probe information transmitted from the in-vehicle terminal of the each probe car, generate road traffic information for specifying a road state by analyzing the received probe information, and transmit the generated road traffic information to the each probe car via the broadcasting system, wherein the in-vehicle terminal further includes a determining unit configured to determine a road state, with respect to each unit road segment included in a plurality of unit road segments traveled by the each probe car, successively in accordance with traveling of the each probe car, and a communications control unit configured to allow the transmitter to transmit, to the center, probe information collected in the each unit road segment, only when a predetermined difference is present in the each unit road segment between (i) the determined road state and (ii) a road state indicated by the traffic information, which is received by the receiver via the broadcasting system. - View Dependent Claims (2, 3, 4)
-
-
5. A traffic information management system comprising:
-
a plurality of probe cars, each probe car having an in-vehicle terminal for collecting probe information including a current position and a speed of the each probe car; a center configured to collect the probe information from the probe cars, generate road traffic information for specifying a road state by analyzing the collected probe information, and provide the road traffic information to the probe cars; a first wireless data communications system for performing a data communications between the in-vehicle terminal and the center using a cell phone network; and a second wireless data communications system for performing a data communications from the center to the in-vehicle terminal using a broadcasting means, via which the in-vehicle terminal receives the road traffic information from the center, wherein the in-vehicle terminal further includes a determining unit configured to determine a road state, with respect to each unit road segment included in a plurality of unit road segments traveled by the each probe car, successively in accordance with traveling of the each probe car, and a communications control unit configured to allow the first wireless data communications system to transmit, to the center, probe information collected in the each unit road segment, only when a predetermined difference is present in the each unit road segment between (i) the determined road state and (ii) a road state indicated by the traffic information received from the center. - View Dependent Claims (6, 7, 8, 9, 10, 11)
-
Specification