Data processing: vehicles – navigation – and relative location – Navigation – Employing position determining equipment
Reexamination Certificate
1998-07-07
2001-01-09
Cuchlinski, Jr., William A. (Department: 3661)
Data processing: vehicles, navigation, and relative location
Navigation
Employing position determining equipment
C701S210000, C701S214000, C701S215000, C701S216000
Reexamination Certificate
active
06173232
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
The invention relates to a vehicle navigation system and a recording medium which executes matching processing of present position detection information to road information, and provides route guidance.
2. Description of Related Art
Since traffic density, especially in the urban areas, has been increasing in recent years and surplus land space has been decreasing, a growing number of newly constructed roads have taken on a multilevel structure. Therefore, the position of a vehicle can be mistakenly identified when a navigation system provides navigation guidance in a case where a plurality of the roads run in parallel. For example, according to the highway recognition system proposed in Japanese Patent Publication No.137096/90, the related art discloses a system which starts to check the time when the system determines the velocity of the running vehicle is higher than a predetermined velocity, and determines the vehicle is running on a highway when the velocity lasts longer than a predetermined time. Further, the system according to the related art detects and cumulates the steering movements when the velocity of the vehicle is higher than the predetermined velocity, and determines whether the vehicle is running on the highway depending on whether the steering angle is larger than the predetermined value. Also the related art discloses a system which determines when the vehicle leaves the highway according to the condition that the velocity decreases as a direction indicator functions and the steering angle is larger than the predetermined value. (See Japanese Patent Publications Nos. 137097/90~137100/90).
The above mentioned related art device determines that the vehicle is running on the highway when the velocity of the vehicle lasts more than the predetermined time, however, according to recent traffic conditions, when the vehicle runs a main road although categorized as an ordinary road, the velocity of the vehicle can be very high depending on a road section. Therefore, the system can't determine simply by the velocity of the vehicle whether the road on which the vehicle is running is a highway. Further, the place where a highway and an ordinary road run in parallel with a two level structure and also the place where two ordinary roads or two highways run in parallel with a two level structure have been increasing. Under these conditions, the prior system can not determine the road on which the vehicle is running by the velocity of the vehicle.
SUMMARY OF THE INVENTION
It is the object of the invention that a precise map matching is executed and a present position is recognized.
The vehicle navigation system according to the invention executes map matching processing of vehicle present position detection information to road information and provides route guidance, comprises information memory means for storing road information on the parallel roads and other information required for executing route guidance; present position detection means for detecting a present position by detecting vehicle travel information; control means for reading road information stored in the information memory means on the basis of the present position detected by the present position detection means, executing matching processing of the present position detection information to the road information, and providing route guidance; wherein the control means determines the road on which the vehicle is running by determining whether the parallel roads exist based on road information stored in the information memory means, by determining whether intersections exist in the vicinity of the present position on the basis of road information stored in the information memory means, when the system determines the vehicle is stopped based on the velocity detected by the present position detection means, by obtaining beacon installation information on the parallel roads from road information stored in the information memory means and determining the types of beacons, or by determining the angles of satellites detected by the present position detection means, and executes matching processing when there exists parallel roads. When the parallel roads exist, the control means determines the road on which the vehicle is running by selecting one of the parallel roads according to the road information of the parallel roads, under the condition the velocity detected by the present position detection means continues during a predetermined distance or time, controlling matching cost, and executing matching processing.
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patent: 5459667 (1995-10-01), Odagaki et al.
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patent: 5821880 (1998-10-01), Hirota et al.
patent: 5938718 (1998-10-01), Morimoto et al.
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patent: 6049753 (2000-04-01), Nimura
patent: 2-137098 (1990-05-01), None
patent: 2-137099 (1990-05-01), None
patent: 2-137096 (1990-05-01), None
patent: 137097 (1990-05-01), None
patent: 2-137100 (1990-05-01), None
Nanba Akimasa
Yanagikubo Takeshi
Aisin Aw Co. Ltd.
Cuchlinski Jr. William A.
Marc-Coleman Marthe Y.
Oliff & Berridg,e PLC
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