Communications: electrical – Vehicle position indication – Map display
Patent
1997-03-03
1998-06-02
Hofsass, Jeffery A.
Communications: electrical
Vehicle position indication
Map display
340990, 340905, 701202, 701209, 701211, G08G 1123
Patent
active
057607133
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a navigation system of a vehicle that searches a route suitable for driving in accordance with acceleration resistance of the vehicle and that provides guidance of the route.
BACKGROUND ART
Recently, a navigation system of a vehicle has been provided and by which guidance of a route to a destination is given to a driver who fails to know his or her way to the destination. The vehicle navigation system stores road data in a memory unit and searches a driving route of the automobile from a present location to the destination on the basis of the road data to provide the route guidance according to the present location of the vehicle.
The conventional navigation system of the vehicle, however, searches the route and provides the route guidance in the same manner of a normal mode even when a big driving load, except for a load due to a slope, is subjected to the vehicle in such a case of driving with a trailer or a case of carrying a heavy load. Therefore, the navigation system might show a slope road or a narrow road on which driving is not easy and adequate accelerating and braking can not be expected.
It is an object of the present invention to provide a navigation system of a vehicle which is capable of searching a route suitable for driving in accordance with acceleration resistance of the vehicle and provides guidance of the route thus searched.
DISCLOSURE OF INVENTION
The present invention has a navigation system of a vehicle comprise input means for inputting information including a destination, store means for storing road information necessary for searching a route and for guiding the route, acceleration resistance detection means for detecting acceleration resistance of the vehicle, route search means for extracting an available road or roads on the basis of the acceleration resistance detected by the acceleration resistance detection means and the road or roads information stored in the store means, and for searching a route to the destination input from the input means by utilizing the available road thus extracted, and route guide means for providing route guidance according to the route searched by the route search means.
According to the present invention, the road information necessary for searching the route and for guiding the route is stored in the store means, and the acceleration resistance of the vehicle is detected by the acceleration resistance detection means. And, the available road is extracted by the route search means on the basis of the acceleration resistance detected by the acceleration resistance detection means and the road information stored in the store means. The route to the destination that is input from the input means is searched by utilizing the available road thus extracted by the route search means. The route guidance is provided according to the route thus searched by the route guide means.
The present invention arranges the acceleration resistance detection means of the vehicle navigation system to compare reference acceleration obtained from torque of an engine with real acceleration obtained from a velocity of the vehicle to detect a data relating to a load condition, except for slope resistance, of the vehicle. That is, the reference acceleration obtained from the torque of the engine is compared with the real acceleration obtained from the velocity of the vehicle by the acceleration resistance detection means to detect the acceleration resistance of the vehicle.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a block diagram showing a configuration of a vehicle navigation system of an embodiment of the present invention.
FIG. 2 is a flow chart showing an operation of the vehicle navigation system.
FIG. 3 is a characteristic graph showing time charts of reference acceleration, a real velocity and so on in a condition that a throttle opening is approximately 20% in a normal mode.
FIG. 4 is a characteristic graph showing time charts of reference acceleration, a real velocity and so on in a condition that a throttl
REFERENCES:
patent: 5311173 (1994-05-01), Komura et al.
patent: 5539399 (1996-07-01), Takahira et al.
patent: 5568390 (1996-10-01), Hirota et al.
patent: 5574649 (1996-11-01), Levy
Kusafuka Muneo
Miki Nobuaki
Murase Yoshitaka
Yokoyama Shoji
Aisin AW Co., Ltd
Hofsass Jeffery A.
Kabushiki Equos Research
Lee Benjamin C.
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