JP4737235B2 - Car navigation system and navigation method - Google Patents

Description

  The present invention relates to an automobile navigation system and navigation method.

  Conventionally, for example, in a passenger car navigation system, when a passenger of a passenger car searches for a route to travel the passenger car to a destination, if a highway priority is input as a search condition in addition to the destination, There is a route search that is preferentially included based on the input search condition.

  By the way, according to the navigation system, the occupant starts traveling the passenger car along the route including the searched highway. Here, after the start of such travel, before the passenger gets on the expressway, the occupant takes the destination on the general road instead of the expressway for some reason, such as knowing the traffic congestion ahead of the searched route. The travel route may be changed to head. In such a case, the passenger car will deviate from the route toward the expressway.

  However, as described above, since the search condition is input to the navigation system with priority to the expressway rather than to the general road, the navigation system repeatedly searches for the route toward the expressway. . As a result, there is a problem that such repeated search gives a passenger a very troublesome feeling.

  In order to eliminate this annoyance, it is necessary to input the search conditions for the general road priority, not the expressway priority, to the navigation system again. Such an input operation is very troublesome for the passenger who is driving the passenger car. Invite the problem of being.

  Therefore, in order to cope with the above, the present invention changes the route search information in general when changing a car traveling along the searched route based on the route search information including the highway priority from driving to the highway. It is an object of the present invention to provide an automobile navigation system and a navigation method which are automatically changed to include road priority.

In order to solve the above-mentioned problems, the present invention provides a route search means for searching for a route for the host vehicle from the current location to the destination based on search conditions to be prioritized, and a highway priority search by the route search means. Expressway determination means for determining whether or not the route searched for under conditions includes an expressway; Deviation determination means for determining whether or not the host vehicle has deviated from the route; and the expressway determination means If the route is determined to include the expressway and the departure determination means determines that the vehicle has departed the route before getting on the expressway, the route search is performed. The present invention provides a vehicle navigation system comprising search condition changing means for changing a condition from highway priority to general road priority.
In the automobile navigation system configured as described above, the highway determination unit determines that the highway is included in the route, and the departure determination unit determines that the host vehicle is on the highway. If it is determined that deviates from the said path before, the search conditions of the route by the search condition changing means is changed to a general road priority from the motorway priority. For this reason, for example, when an occupant changes his / her intention to travel to a destination through a general road, the expressway priority in the search conditions is automatically changed to the general road priority, and the search thus changed with the condition, since the new route search is performed, trouble of the route search toward the highway is searched repeatedly disappears.
In carrying out the present invention, in the automobile navigation system configured as described above, when it is determined that the host vehicle has deviated from the route, a re-search unit for re-searching the route, and the re-search unit In the route re-searched by the route search means, the route search means further comprises a change determination means for determining whether or not an interchange that rides on the expressway has been changed from the route searched by the route search means, It is determined that the expressway is included in the route, the departure determining means determines that the vehicle has departed the route before getting on the expressway, and the interchange has been changed. In such a case, the search condition for the route may be changed from highway priority to general road priority and re-searched . In this case, even if a change in intention that the occupant goes to the destination through a general road is determined based on the change in the line interchange of the car, the expressway priority is automatically selected among the search conditions. It is changed to general road priority, and a new route is searched under the search conditions thus changed.
In carrying out the present invention, in the automobile navigation system configured as described above, re-searching means for re-searching the route when it is determined that the host vehicle has deviated from the route; The apparatus further comprises re-search number calculation means for calculating the number of re-searches by which the route is re-searched by the search means, and the highway determination means determines that the highway is included in the route, and the deviation determination When the vehicle determines that the vehicle has deviated from the route before getting on the expressway and the number of re-searches is equal to or greater than a predetermined number, the search condition for the route is generally set to expressway priority. The search may be re-searched after changing to road priority.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 shows a first embodiment of a passenger car navigation system to which the present invention is applied. The navigation system includes a GPS receiver 10 and a remote controller 20. The GPS receiver 10 receives radio waves transmitted from an artificial satellite of a satellite navigation system (also referred to as GPS), measures the current location of the passenger car, and outputs it as a current location signal. The remote controller 20 is portable and, by its operation, transmits necessary information as a signal to a receiving unit (not shown) of the microcomputer 30 (described later). Here, the necessary information represents, for example, a request for displaying a desired map, a request for inputting a search condition for a route from the current location of the passenger car to the destination, and other various requests.

  The navigation system also includes a microcomputer 30, a hard disk drive 40 (hereinafter referred to as HDD 40), and a display device 50. A hard disk drive is also called a hard disk.

  The microcomputer 30 executes the computer program according to the flowcharts shown in FIGS. 2 and 3, and during this execution, the output signal of the GPS receiver 10 and the transmission signal of the remote controller 20 are received by the receiving unit and the data of the HDD 40. Based on (described later), processing required for route search and route guidance of the passenger car and other processing are performed. In the first embodiment, the receiving unit is not limited to being built in the microcomputer 30 and may be externally attached to the microcomputer 30. Further, the microcomputer 30 is operated by being supplied with power from the battery B via the ignition switch IG of the passenger car. The computer program is written in advance in a ROM built in the microcomputer 30 so as to be readable by the microcomputer 30.

  The HDD 40 is operated by being supplied with power from the battery B via the ignition switch IG, and the map data of the HDD 40 is read by the microcomputer 30. In the first embodiment, each map data representing each of a plurality of maps is written in the HDD 40 as a database so that it can be read out by the microcomputer 30.

  The display device 50 displays data necessary for the passenger car as information under the control of the microcomputer 30. In the first embodiment, a liquid crystal display device including a liquid crystal panel and a drive circuit is employed as the display device 50, and the liquid crystal panel is provided at the center in the left-right direction of the dash panel in the passenger compartment of the passenger car. It has been.

  In the first embodiment configured as described above, when the ignition switch IG is turned on, the microcomputer 30 is powered by the battery B and is in an operating state. According to the flowcharts of FIGS. Start execution. Accordingly, in step 100, it is determined whether or not there is a map display request. Here, if a display request for a desired map is transmitted as a signal by the operation from the remote controller 20, map data representing the desired map is read from the database of the HDD 40 in step 101. Next, at step 110, the current location of the passenger car is determined based on the current location signal from the GPS receiver 10.

  Thereafter, when a search condition including the destination is transmitted as a signal by the operation from the remote controller 20, YES is determined in step 120 based on this transmission being a request for inputting the search condition to the microcomputer 30. In step 121, the search condition is input to the microcomputer 30.

  Next, route search processing is performed in the next step 130. In this route search process, the map data read in step 101 and the current location in step 110 are combined as display data, and this display data is displayed by the display device 50 as a desired map and the current location on this map.

  Further, a route from the current location to the destination is searched based on the input search condition in step 120. Under such a search, the search route is displayed on the display map of the display device 50. For this reason, the driver of the passenger car starts traveling of the passenger car along the searched route.

  After the processing in step 130 as described above, in step 140, it is determined whether or not the searched route includes an expressway. Here, if the determination in step 140 is YES because the highway is included, in step 141, the current location tracking process of the passenger car is generated from the start of the travel of the passenger car. On the display map of the display device 50 based on the current location signal, a route guidance process for the passenger car is performed in step 142 based on the current location tracking process.

  Thereafter, if the passenger car is not on the expressway in the searched route, NO is determined in step 150 based on the current location of the passenger vehicle on the expressway (specified by the current location signal of the GPS receiver 10). It is determined. Next, in step 160, it is determined whether the passenger car has deviated from the searched route.

  At the present stage, if the passenger car is traveling on the guide route along the searched route, the determination in step 160 is NO based on the current location specified by the current location signal from the GPS receiver 10. Thereafter, if the passenger vehicle is traveling on the expressway in the searched route while the passenger vehicle is traveling so that the process of circulating through steps 141 to 160 is repeated, the determination in step 150 is YES. It becomes.

  On the other hand, if the passenger of the passenger car changes his / her route so that he / she travels to the destination on a general road without driving the search route as it is, before the passenger car gets on the expressway, The passenger car deviates from the searched route. Such a deviation is, for example, the intention of the passenger to change the route by recognizing that traffic congestion has occurred on the road ahead of the guide route along the searched route due to a road sign or the like while the passenger car is traveling. Get up.

  If the determination is YES based on the current location signal from the GPS receiver 10 at step 160 before the determination at step 150 is YES due to the deviation from the search route as described above, the computer program Go to step 161 of 3. Then, in this step 161, the route search is performed again under the search conditions with the highway priority. That is, based on the search conditions, the search route search process from the current location to the destination is performed on the display map of the display device 50.

  After this re-search process, in step 162, the variable data i is added and updated as i = i + 1 = 1. Here, the variable data i represents the number of times of the search route re-search process in step 161. Next, at step 170, it is determined whether or not the variable data i is i ≦ n.

  However, n represents an allowable upper limit value of the number of re-search processes of the search route. In the first embodiment, the allowable upper limit value is 2 as an upper limit value that does not cause the passenger to feel troublesome about the number of route re-search processing on the display map of the display device 50 that is performed in response to the change in intention. Is set. Note that n is not limited to n = 2, and may be changed to 3 or other values as necessary. The variable data i is cleared to i = 0 during the process in step 130.

  At this stage, the determination in step 170 is YES because the variable data i = 1. Therefore, when the latest update variable data in step 162 becomes i = 3 during the repetition of the cyclic processing through steps 140 to 170, the determination in step 170 is NO. As a result, it is recognized that the intention change by the occupant is maintained, and therefore, in step 171, the highway priority in the search conditions is automatically changed to the general road priority.

  When one of the search conditions is changed in this way, in the next step 180, the current location (GPS receiver) is displayed on the display map of the display device 50 based on the changed search condition including the destination and the general road priority. A search route (hereinafter also referred to as a changed search route) from the current location signal from 10 to the destination through the general road is newly searched. After that, in step 181, route guidance processing from the current location to the destination is performed on the display map of the display device 50 under the search processing.

  If NO is determined in step 140, the passenger follows the searched route including the general road, and the passenger follows the current location tracking process in step 181 and the route guidance process in step 190. Drive towards the destination. If YES is determined in step 150, the passenger follows the searched route including the expressway, and the passenger follows the current location tracking process in step 181 and the route guidance process in step 190. Drive towards the destination.

  As described above, in the first embodiment, as a result of the route search process (see step 130) performed based on the input of the search condition including the destination (see step 121), the highway is included in the searched route by this process. If it is included, the passenger car is caused to travel along the guidance route based on the current location tracking process (see step 141) and the route guidance process (see step 142). And, if the passenger changes his intention to go to the destination through a general road due to traffic congestion or the like before the passenger car gets on the expressway, the determination that the intention change is maintained ( Based on the determination of NO in step 150, the determination of YES in step 160, and the determination of NO in step 170), among the input search conditions including highway priority, the expressway priority is general road priority Is automatically changed (see step 171). Then, based on the change of the search condition, a new search process is performed for the changed search route from the current location including the general road priority to the destination.

  In this way, when the occupant changes his / her intention to pass the general road toward the destination, the expressway priority in the search conditions is automatically changed to the general road priority, and the search thus changed Since a new route search is performed under conditions, there is no inconvenience to the occupant that a route toward the highway is repeatedly searched.

Further, as described above, the expressway priority in the search conditions is automatically changed to the general road priority, so that it is troublesome to input the search condition including the general road priority to the microcomputer 30 by the remote controller 20 again. This eliminates the need for operation and is convenient for passengers who are driving the passenger car. Therefore, the passenger can safely travel the passenger car comfortably to the destination using the general road after the change of intention.
(Second Embodiment)
FIG. 4 shows the configuration of the main part of the second embodiment of the present invention. In the second embodiment, a part of a flowchart (see FIGS. 2 and 3) for executing the computer program described in the first embodiment is changed as shown in FIG. Other configurations are the same as those in the first embodiment.

  In the second embodiment configured as described above, if the determination in step 140 is YES as in the first embodiment, i = 0 is cleared in step 140a unlike the first embodiment. Is done.

  Then, as described in the first embodiment, if the search route deviates from the search route including the highway before getting on the highway, before the determination of YES in step 150, In step 160, a determination of YES is made. As described in the first embodiment, this is because the passenger of the passenger car does not travel on the searched route as it is on the general road before the passenger car gets on the expressway. This is because the passenger car deviates from the searched route when the route is changed so as to go to.

  After YES is determined in step 160 as described above, the processing of both steps 161 and 162 is not performed as described in the first embodiment, and whether or not i ≦ n is determined in step 170. Made directly. At this stage, since i ≦ n, the determination in step 170 is YES, and the processing of both steps 161 and 162 is performed in the same manner as described in the first embodiment. That is, in step 161, the search route is re-searched under the search conditions with highway priority, and in step 162, the variable data i is added and updated.

  Thereafter, the processing in steps 141 and 142, the determination of NO in step 150, the determination of YES in step 160, the determination of YES in step 170, and the processing in steps 161 and 162 are sequentially repeated. In the meantime, when the latest updated variable data i = 3 in step 162, the determination in step 170 is NO. As a result, as in the first embodiment, since it is recognized that the occupant's intention to change the route is maintained, in step 171, the highway priority in the search conditions is automatically changed to the general road priority. Changed to

  When one of the search conditions is changed in this way, in the next step 180, on the basis of the changed search condition including the destination and the general road priority, the general road is passed from the current location as in the first embodiment. The modified search route to the destination is newly searched for. Accordingly, the processing after step 181 is performed in the same manner as in the first embodiment.

As described above, in the second embodiment, unlike the first embodiment, immediately after the determination of the departure from the search route in step 160, whether or not i ≦ n is satisfied in step 170 is determined. The processes of steps 161 and 162 are performed in accordance with the establishment of i ≦ n, but the same operational effects as those of the first embodiment can be achieved through such a process.
(Third embodiment)
FIG. 5 shows the configuration of the main part of the third embodiment of the present invention. In the third embodiment, a part of a flowchart (see FIGS. 2 and 3) for executing the computer program described in the first embodiment is changed as shown in FIG. The variable data i and n described in the first embodiment are abolished. Other configurations are the same as those in the first embodiment.

  In the third embodiment configured as described above, in the same way as described in the first embodiment, a step is taken when the search route deviates from the search route including the highway before the highway is boarded. Before the determination at 150 is YES, the determination at step 160 is YES.

  As described in the first embodiment, this is because the passenger of the passenger car does not travel on the searched route as it is on the general road before the passenger car gets on the expressway. This is because the passenger car deviates from the searched route when the route is changed so as to go to. Along with the processing in step 160, as in the first embodiment, the search route is re-searched in step 161 under the search conditions with the highway priority.

  When the re-search process is completed, it is determined in step 170A whether or not the interchange to be ridden has been changed from the lane interchange of the search route in step 130 by the re-search process in step 161. When it is determined NO in step 170A, the process of circulating through steps 141 to 170A is repeated. If YES in step 170A, the highway priority in the search conditions is automatically changed to the general road priority in step 171 as in the first embodiment. After this change, the processing after step 180 is performed as in the first embodiment.

  As described above, in the third embodiment, in the same manner as in the first embodiment, passengers are required to enter the traffic before the passenger car rides on the expressway under the input search conditions including the destination and the expressway priority. If the intention change is made when heading to the destination through a general road due to a traffic jam or the like, it is determined that the intention change is maintained (determination of NO in step 150 and YES in steps 160 and 170A). In the input search condition including the highway priority, the highway priority is automatically changed to the general road priority (see step 171). Based on the change of the search condition, the search route from the current location to the destination through the general road is newly searched in the same manner as in the first embodiment.

Thus, even when a change in intention that the occupant goes to the destination through a general road is determined based on a change in the line interchange of the passenger car, the expressway priority in the search conditions is automatically set. Since the search route is newly searched with the search conditions changed in this way, the same effect as described in the first embodiment can be achieved.
(Fourth embodiment)
6 to 9 show a fourth embodiment of the present invention. In the fourth embodiment, the flowchart (see FIGS. 2 and 3) for executing the computer program described in the first embodiment is changed to the flowcharts shown in FIGS.

  In the fourth embodiment, as shown in FIG. 6, unlike the first embodiment, the mobile phone 60 and the passenger car described in the first embodiment are provided in a base instead of the HDD 40. An information device 70 of the information center is adopted. The mobile phone 60 receives output data (described later) from the microcomputer 30 described in the first embodiment and transmits it to the information device 70, and receives transmission data (described later) from the information device 70. And input to the microcomputer 30.

  The information device 70 includes a transmitter / receiver 70a, a server 70b, and a storage device 70c. The transmitter / receiver 70a receives transmission data from the mobile phone 60 and inputs it to the server 70b, and outputs output data from the server 70b. It is inputted and transmitted to the mobile phone 60. The storage device 70c stores a database written in the HDD 40 described in the first embodiment.

  The server 70b executes the server program according to the flowchart shown in FIG. 9, and during this execution, performs route search processing based on the input data from the transceiver 70a and the database in the storage device 70c, and outputs the data to the transceiver 70a. Perform processing. The server program is stored in advance in a ROM of a computer that is the server 70b. Other configurations are the same as those in the first embodiment.

  In the fourth embodiment configured as described above, the microcomputer 30 executes the computer program according to the flowcharts of FIGS. 7 and 8, and the server 70b executes the server program according to the flowchart of FIG.

  If the determination in step 100 (see FIGS. 2 and 7) is YES based on the display request from the remote controller 20 as described in the first embodiment, the desired in step 101A (see FIG. 7). A command for reading out map data representing the map is issued, and this command is output from the microcomputer 30 to the mobile phone 60 and transmitted from the mobile phone 60 to the information device 70 as a transmission signal.

  Then, a transmission signal representing a map data read command from the mobile phone 60 is received by the transceiver 70a of the information device 70 and input to the server 70b. Since there is a map data read command in this way, YES is determined in step 200 of FIG. 9, and in step 201, map data representing a desired map is read from the database of the storage device 70c.

  In addition, after the processing of step 101A in FIG. 7, in step 110, the current location of the passenger car is determined in the same manner as described in the first embodiment. Next, if it is determined YES in step 120 based on the same search condition input request as described in the first embodiment, the current location and search condition are input in step 121A and output to the mobile phone 60. The data is transmitted from the mobile phone 60 as data. Accordingly, the transmission data is received by the transceiver 70a of the information device 70 and input to the server 70b. For this reason, it is determined as YES in step 210 of FIG. 9 that the current location and the search condition are received.

  Then, in step 211, route search processing is performed. In this route search process, a search route is searched based on the map data read in step 201 and the current location and search conditions received in step 210. The search route searched in this way is transmitted as data from the server 70b to the mobile phone 60 via the transceiver 70a together with the map data in step 212.

  Thus, when the mobile phone 60 outputs the received data to the microcomputer 30, the microcomputer 30 determines YES in step 130A because it is reception of the search route. With this reception, the map data and the search route are combined as display data, and this display data is displayed by the display device 50 as a desired map and the current location on this map. Accordingly, the passenger of the passenger car starts traveling the passenger car along the search route on the display map on the display screen of the display device 50.

  Further, after the determination of YES in step 130A, the processing from step 140 to step 160 in FIG. 7 is performed as in the first embodiment. As in the first embodiment, if the determination in step 160 is YES because the passenger car deviates from the search route including the highway, the passenger vehicle specified by the current position signal from the GPS receiver 10 is determined in step 160a. Is output to the mobile phone 60, and further transmitted from the mobile phone 60 to the information device 70. Then, the transceiver 70a inputs the current location from the mobile phone 60 to the server 70b. Accordingly, in step 220 of FIG. 9, it is determined YES based on the current location reception.

  After this determination, in step 221, the search route is re-searched under the search conditions with priority on the highway in substantially the same manner as in step 161 of FIG. 3. In step 222, the search route by the search process is transmitted from the server 70b to the mobile phone 60 via the transceiver 70a.

  Thus, when the mobile phone 60 inputs the search route to the microcomputer 30, the microcomputer 30 determines YES in step 161A of FIG. 8 because the search route is received based on the reroute search. Thereafter, similarly to the first embodiment, the processing from Step 140 to Step 170 is performed.

  As in the first embodiment, when the determination in step 170 is NO, the intention change by the occupant toward the destination on the general road instead of the expressway is maintained, so in step 171A, the search condition Our highway priority is automatically changed to general road priority and is output to the mobile phone 60. When the cellular phone 60 transmits general road priority to the transceiver 70a, the transceiver 70a inputs the received data to the server 70b. For this reason, in step 230 of FIG. 9, it is determined that the reception is given priority to the general road, YES.

  Accordingly, in step 231, the search route search process is newly performed based on the change search condition including the destination and the general road priority, and the change search route including the general road is obtained from the server 70 b in step 232. It is transmitted to the mobile phone 60 through the transceiver 70a.

  When the mobile phone 60 inputs the change search route to the microcomputer 30, it is determined YES in step 180A of FIG. 8 based on the reception of the change search route. Accordingly, the processes of steps 181 and 190 are performed as in the first embodiment. Based on such processing, the occupant causes the passenger car to travel toward the destination on a general road.

  As described above, in the fourth embodiment, unlike the first embodiment, the mobile phone 60 and the information device 70 are employed instead of the HDD 40. Then, the database written in the HDD 40 is stored in the storage device 70c of the information device 70, and the search processing of the search route based on the search condition including the highway priority and the route including the general road priority performed by the microcomputer 30 are performed. The search processing of the changed search route based on the search information is performed by the server 70b based on the use of communication between the microcomputer 30 and the information device 70 via the mobile phone 60. Also by this, the same effect as the first embodiment can be achieved.

Here, instead of the storage device 70c of the information device 70, a public telecommunication line such as the Internet is used, and a wide variety of information more detailed than the information corresponding to the database is also taken into the server 70b. Then, the route search according to the search condition can be performed in more detail and extensively.
(Fifth embodiment)
FIG. 10 shows a main part of the fifth embodiment of the present invention. In the fifth embodiment, a part of a flowchart (see FIGS. 7 and 8) for executing the computer program described in the fourth embodiment is changed as shown in FIG. The variable data i and n described in the fourth embodiment are abolished. Other configurations are the same as those in the fourth embodiment.

  In the fifth embodiment configured as described above, the search route re-searched by the server 70b based on the search condition including the highway priority is received by the mobile phone 60 in the same manner as described in the fourth embodiment. When input to the microcomputer 30, YES is determined in step 161A.

  Then, in step 170A, it is determined YES as in the third embodiment by changing the line interchange of the passenger car. Then, in step 171A, as described in the fourth embodiment, the highway priority in the search conditions is changed to the general road priority and is output to the mobile phone 60, and is received by the transceiver 70a of the information device 70. And input to the server 70b. After this input, the processing after step 230 (see FIG. 9) and the processing after step 180A (see FIG. 8) are performed as in the fourth embodiment.

  Thus, even when a change in intention that the occupant goes to the destination through a general road is determined based on a change in the line interchange of the passenger car, expressway priority is automatically selected among the search conditions. Since the search route is newly searched with the changed search conditions in this way, the same operation and effect as described in the fourth embodiment can be achieved.

  In carrying out the present invention, in each of the first and second embodiments, the variable data i represents the number of search route re-search processes in step 161, and n represents the search route re-search process. However, instead of this, the variable data i represents the number of determinations as YES in step 160 (the number of determinations as departure from the search route), and n is You may make it represent the allowable upper limit of the frequency | count of determination with the deviation of a search path | route. As a result, the highway priority is automatically changed to the general road priority among the search conditions not by the number of times of the search route re-search process but also by the number of departures from the search route. The effect similar to each embodiment of 2 can be achieved.

  In implementing the present invention, instead of the remote controller 20, a touch switch panel provided on the surface of the liquid crystal panel of the display device 50 and having the same function as the remote controller 20 has the same function as the other remote controller 20. An operating means may be adopted.

  In implementing the present invention, instead of measuring the current location by the GPS receiver 10, a vehicle speed sensor and an azimuth sensor are adopted, and the travel distance from the current location is calculated from the detected vehicle speed of the passenger car by the vehicle speed sensor and the azimuth sensor The traveling direction of the passenger car may be detected to calculate the current location on the route from the departure point of the passenger car, or the current location calculation and the current location measurement by the GPS receiver 10 may be used in combination. Good.

  Further, in carrying out the present invention, the navigation system may transmit various information necessary for guiding the passenger car to the occupant, for example, by the sound of the audio device in addition to the display of the display device 50. Good.

  Further, in carrying out the present invention, a transceiver capable of various types of wireless communication such as PHS and a car phone may be employed instead of the mobile phone 60.

  In implementing the present invention, unlike in each of the embodiments described above, when it is determined in step 140 that the search condition for the passenger car from the current location to the destination includes highway priority, the route is based on the search condition. When the passenger car traveling along the searched route is changed from traveling on the expressway (determination of NO in step 150, determination of YES in step 160, and determination of NO in step 170) Or the determination of NO in step 150 and the determination of YES in both steps 160 and 170A), the search condition is automatically changed to include general road priority (see step 171 or 171A). Even if the route search is performed based on the changed route search condition, the same effects as those of the above-described embodiments can be achieved.

  In implementing the present invention, in the information device 70 described in the fourth embodiment, the storage device 70c may be built in the server 70b as a hard disk drive instead of being externally attached to the server 70b.

  In the implementation of the present invention, the application target of the navigation system is not limited to a passenger car, and may generally be a car such as a bus, a truck, or a two-wheeled vehicle.

  In carrying out the present invention, the passenger car is not limited to a gasoline engine as a prime mover, but a diesel car with a diesel engine as a prime mover, an electric vehicle with a motor as a prime mover, and a hybrid car with a motor as a prime mover. It may be.

1 is a block diagram showing a first embodiment of the present invention. It is a front | former part of the flowchart which shows the effect | action of the microcomputer of FIG. It is a back | latter stage part of the flowchart which shows the effect | action of the microcomputer of FIG. It is a flowchart which shows the principal part of 2nd Embodiment of this invention. It is a flowchart which shows the principal part of 3rd Embodiment of this invention. It is a block diagram which shows 4th Embodiment of this invention. It is a front | former part of the flowchart which shows the effect | action of the microcomputer of FIG. 7 is a latter part of a flowchart showing the operation of the microcomputer of FIG. 6. It is a flowchart which shows the effect | action of the server of FIG. It is a flowchart which shows the principal part of 5th Embodiment of this invention.

Explanation of symbols

10 ... GPS receiver, 20 ... remote controller,
30 ... Microcomputer, 40 ... HDD, 50 ... Display device,
60 ... mobile phone, 70 ... information device, 70a ... transceiver, 70b ... server,
70c: Storage device.

Claims (3)

A route search means for searching based on a search condition that the vehicle should give priority to a route from the current location to the destination;
Highway determination means for determining whether or not an expressway is included in the route searched under the expressway priority search condition by the route search means ;
Deviation determination means for determining whether the host vehicle has deviated from the route ;
When it is determined that the highway is included in the route by the highway determination unit, and the vehicle is deviated from the route before getting on the highway by the departure determination unit Search condition changing means for changing the search condition for the route from highway priority to general road priority;
An automobile navigation system comprising: Re-search means for re-searching the route when it is determined that the host vehicle has deviated from the route;
The route re-searched by the re-search means further comprises a change determination means for determining whether or not an interchange that rides on the expressway has been changed from the route searched by the route search means,
The highway determining means determines that the highway is included in the route, the departure determining means determines that the vehicle has deviated from the route before getting on the highway, and 2. The automobile navigation system according to claim 1, wherein , when it is determined that the interchange has been changed, the search condition for the route is changed from highway priority to general road priority and re-search is performed . 3. Re-search means for re-searching the route when it is determined that the host vehicle has deviated from the route;
Further comprising a re-search number calculation means for calculating a re-search number of times the route is re-searched by the re-search means,
The highway determining means determines that the highway is included in the route, the departure determining means determines that the vehicle has deviated from the route before getting on the highway, and 2. The automobile navigation system according to claim 1, wherein when the number of re-searches is equal to or greater than a predetermined number, the search condition for the route is changed from highway priority to general road priority, and re-search is performed .

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