Navigation device and method therefor
First Claim
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1. A navigation device which comprises:
- a position detection means which detects a present position of a moving body;
a setting means which sets a destination;
an information acquisition means which acquires obstacle time information relating to an obstacle on the route, said obstacle temporarily denying passage of said moving body on said route;
a route searching means which searches for a route, which can be negotiated in a minimum travel time from said present position of said moving body detected by said position detection means to said destination set by said setting means, by reference to said obstacle time information acquired from said information acquisition means; and
an indication means which indicates a recommended route searched for by said route searching means, wherein said route searching means includes a waiting time, said waiting time being the period from an expected arrival time at an obstacle to a time when the obstacle will allow passage, in said minimum travel time from said present position to said destination when the expected arrival time of a moving body at said obstacle is in a timeframe in which the passage of the moving body will be temporarily denied.
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Abstract
A microcomputer 4 is provided which searches a recommended route which can be negotiated in a minimum time from a present position of a moving body detected by a GPS receiver 1 to a destination set by a operational device 3 by reference to obstacle time information played from a CD-ROM player 2.
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Citations
26 Claims
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1. A navigation device which comprises:
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a position detection means which detects a present position of a moving body;
a setting means which sets a destination;
an information acquisition means which acquires obstacle time information relating to an obstacle on the route, said obstacle temporarily denying passage of said moving body on said route;
a route searching means which searches for a route, which can be negotiated in a minimum travel time from said present position of said moving body detected by said position detection means to said destination set by said setting means, by reference to said obstacle time information acquired from said information acquisition means; and
an indication means which indicates a recommended route searched for by said route searching means, wherein said route searching means includes a waiting time, said waiting time being the period from an expected arrival time at an obstacle to a time when the obstacle will allow passage, in said minimum travel time from said present position to said destination when the expected arrival time of a moving body at said obstacle is in a timeframe in which the passage of the moving body will be temporarily denied. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A navigation method which comprises the steps of:
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setting a destination and detecting a present position of a moving body;
acquiring obstacle time information relating to an obstacle on a route which is in a timeframe which will deny passage of said moving body on said route;
searching for a recommended route which can be negotiated in a minimum travel time from said present position of said moving body to said destination by reference to obstacle time information; and
indicating said recommended route, wherein the step of searching for a recommended route includes a waiting time, said waiting time being the period from an expected arrival time at said obstacle to a time when the obstacle will allow passage, in the minimum travel time from said present position to said destination when the expected arrival time of said moving body at said obstacle is in a timeframe in which the passage of the moving body will be temporarily denied. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A navigation device comprising:
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a determining device for determining an optimal route from a detected location of a moving body to a set destination chosen from a plurality of eligible routes according to a shortest travel time, wherein a travel time of each eligible route includes any waiting time during which said moving body is expected to be temporarily denied passage at a predetermined location in said eligible route based on timetable information for said predetermined location and an expected time of arrival for said moving body at said predetermined location; and
an output device for outputting said determined optimal route. - View Dependent Claims (18, 19, 20, 21, 24)
said waiting time is calculated as the period of time from said expected time of arrival to the end of said time interval, when said expected time of arrival falls within said time interval. -
19. A navigation device according to claim 17, wherein said determining device retrieves said timetable information from a recording medium.
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20. A navigation device according to claim 17, wherein said determining device retrieves said timetable information from the Internet via radio signals.
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21. A navigation device according to claim 17, wherein said predetermined location includes a railroad crossing.
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24. A navigation method according to claim 20, wherein said determining step retrieves said timetable information from a recording medium.
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22. A navigation method comprising:
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detecting a location of a moving body;
setting a destination;
determining an optimal route from said detected location to said destination chosen from a plurality of eligible routes according to a shortest travel time, wherein a travel time of each eligible route includes any waiting time during which said moving body is expected to be temporarily denied passage at a predetermined location in said eligible route based on timetable information for said predetermined location and an expected time of arrival for said moving body at said predetermined location; and
outputting said determined optimal route. - View Dependent Claims (23, 25, 26)
calculating said waiting time as the period of time from said expected time of arrival to the end of said time interval, when said expected time of arrival falls within said time interval.
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25. A navigation method according to claim 22, wherein said determining step retrieves said timetable information from the Internet via radio signals.
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26. A navigation method according to claim 22, wherein said predetermined location includes a railroad crossing.
Specification