JP6299253B2 - Other vehicle position display device - Google Patents

Description

  The present invention relates to another vehicle position display device that calibrates and displays the positions of surrounding vehicles transmitted by wireless communication by map matching.

  Patent Document 1 discloses a technique for acquiring the position of a surrounding vehicle existing around the host vehicle by inter-vehicle communication, and matching the position of the surrounding vehicle on a map road by performing map matching. Yes.

JP 2005-328283 A

  However, if all vehicle positions received from other vehicles in the vicinity of the host vehicle (hereinafter referred to as other vehicle positions) are matched with roads on the map by map matching, the number of other vehicles that receive the other vehicle positions increases. The processing load due to map matching increases.

  In view of this, it is conceivable to limit the positions of other vehicles that perform map matching to vehicles close to the host vehicle. However, if it does so, the figure showing the other vehicle which exists in the position far from the own vehicle will be displayed at a position different from the road on the map, and there is a problem that the person who sees the map feels uncomfortable.

  The present invention has been made in view of the above problems, and its object is to reduce the processing load caused by map matching while reducing the discomfort that gives the viewer the position of another vehicle transmitted by wireless communication. Another object is to provide a vehicle position display device that can be displayed.

  The above object is achieved by a combination of the features described in the independent claims, and the subclaims define further advantageous embodiments of the invention. Further, the reference numerals in parentheses described in the claims indicate the correspondence with the specific means described in the embodiments described later as one aspect, and limit the technical scope of the present invention. is not.

The present invention for achieving the above object is used in a vehicle, and the other vehicle position, which is the position of the other vehicle, is acquired by the other vehicle position acquisition unit (164) that acquires by wireless communication and the other vehicle position acquisition unit Based on the fact that the position of the other vehicle is within the range surrounding the host vehicle that is set to a range narrower than the map display range, map matching is performed so that the position of the other vehicle is located on the road of the map. When the other vehicle position acquired by the unit is outside the peripheral range, the map matching unit (168) that does not perform map matching for the other vehicle position and the predetermined display unit (14) A road map in which the scale outside the peripheral range is smaller than the scale of the peripheral range, and the other vehicle position acquired by the other vehicle position acquisition unit is within the peripheral range car The other vehicle figure (60) which shows that the other vehicle exists in the other vehicle position after performing map matching on a road map is displayed, and the other vehicle which the other vehicle position acquisition part acquired For other vehicles whose position is within the map display range but outside the peripheral range, the map display processing unit (169) displays the other vehicle graphic at the other vehicle position acquired by the other vehicle position acquisition unit on the road map. ), And the map display processing unit reduces the other vehicle graphic displayed outside the peripheral range as the scale of the position where the other vehicle graphic is displayed is smaller than the scale of the peripheral range. It is a vehicle position display device.

  As described above, in the present invention, map matching is performed for other vehicle positions in the peripheral range of the host vehicle set in a range narrower than the map display range. However, even within the map display range, map matching is not performed for other vehicle positions outside the peripheral range. Therefore, the processing load for performing map matching can be reduced as compared with the case where map matching is performed for all other vehicle positions located within the map display range.

  Further, the outside of the peripheral range is displayed with a scale smaller than that of the peripheral range. Therefore, even if the position of the other vehicle graphic to be displayed outside the surrounding range is not on the road, it is difficult to understand that the other vehicle graphic is not on the road. Become.

It is a figure which shows the structure of the radio | wireless communication apparatus 2 used with the portable terminal 1 used as embodiment of the other vehicle position display apparatus of this invention and this portable terminal 1 with a vehicle. It is a figure which shows the function of the portable side control part 16 of FIG. 3 is a flowchart illustrating processing of a map matching unit 168 and a map display processing unit 169 in FIG. 2. It is a figure explaining the peripheral range 30 and the map display range 40. FIG. It is an example of the road map displayed on the display part 14 by performing step S12 of FIG. It is an example of a display where the whole road map is the same scale. It is a figure which shows an example of the road map displayed on the display part 14 in 2nd Embodiment. It is a figure which shows an example of the road map displayed on the display part 14 in the modification 2. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
First, the portable terminal 1 will be described with reference to FIG. 1 which is an overall configuration diagram of the first embodiment. In the first embodiment, the portable terminal 1 corresponds to another vehicle position display device of the present invention. The mobile terminal 1 may be configured to use a multi-function mobile phone such as a smartphone. The mobile terminal 1 includes a near field communication unit 11, a position detector 12, a display unit 14, a wide area communication unit 15, and a mobile side control unit 16. In the present embodiment, for the sake of convenience, among the functions related to the functions of a general multi-function mobile phone, those not necessary for the description of the present invention are not described.

  The short-range communication unit 11 includes a transmission / reception antenna, and exchanges information with the wireless communication device 2 used in the host vehicle by performing wireless communication in accordance with the Bluetooth (registered trademark) standard. Note that the communication between the mobile terminal 1 and the wireless communication device 2 may be other than the configuration in which wireless communication conforming to the Bluetooth standard is performed. For example, it may be configured to perform wireless communication according to short-range wireless communication standards such as ZigBee (registered trademark) or wireless LAN standards such as IEEE 802.11, or may be configured to perform wired communication such as USB communication.

  The position detector 12 is based on information obtained from a sensor such as a GPS receiver 13 for a global positioning system (GPS) that detects the current position of the terminal itself (hereinafter referred to as the terminal position) based on radio waves from the artificial satellite. In addition, the terminal position is sequentially detected. A configuration using a sensor other than the GPS receiver 13 may be used. This terminal position is represented by latitude and longitude.

  In the present embodiment, the configuration in which the GPS receiver 13 for GPS is used as the receiver of the satellite positioning system is shown. However, the configuration is not necessarily limited to this, and the configuration in which the receiver of the satellite positioning system other than GPS is used. Also good.

  The display unit 14 is configured using a liquid crystal display, an organic EL display, or the like, and displays text and images in accordance with instructions from the portable control unit 16.

  The wide area communication unit 15 is a communication unit capable of communicating with a map management server (not shown) that distributes road map data via a public telephone line network.

  The portable-side control unit 16 is configured as a normal computer, and includes a well-known CPU, a memory such as a ROM, a RAM, and an EEPROM, an I / O, and a bus line for connecting these configurations (not shown). Etc.). The portable side control unit 16 executes various processes based on various information input from the short-range communication unit 11, the position detector 12, and the wide area communication unit 15.

  As illustrated in FIG. 2, the mobile-side control unit 16 executes a program stored in advance in the ROM so that the host vehicle position acquisition unit 161, the position transmission processing unit 163, the other vehicle position acquisition unit 164, Functions as a road map acquisition unit 166, a map matching unit 168, and a map display processing unit 169 are provided.

  The own vehicle position acquisition unit 161 acquires the terminal position sequentially detected by the position detector 12 of the own terminal from the position detector 12, and stores the acquired terminal position in the own vehicle position storage unit 162 as the vehicle position of the own vehicle. . The own vehicle position accumulating unit 162 is constructed in an electrically rewritable memory such as a RAM or an EEPROM.

  When the vehicle position of the host vehicle is stored in the host vehicle position storage unit 162, the time information (that is, the time stamp) when the vehicle position of the host vehicle is acquired is linked and stored. Moreover, what is necessary is just to set it as the structure which deletes in order from older information, when the own vehicle position storage part 162 exceeds the allocated memory capacity. In addition, it is good also as a structure which deletes the vehicle position which passed for a fixed time since memorize | stored.

  When the position transmission processing unit 163 receives an acquisition request for the vehicle position from the wireless communication device 2 of the own vehicle via the short-range communication unit 11, the position transmission processing unit 163 performs a plurality of times of self-accumulation accumulated in the own vehicle position accumulation unit 162. The vehicle position of the vehicle is read together with a time stamp. Then, the read vehicle position and time stamp of the host vehicle are transmitted to the wireless communication device 2 via the short-range communication unit 11. The wireless communication device 2 transmits the vehicle position and the time stamp to the outside.

  Similarly, the wireless communication device 2 mounted on the other vehicle transmits the vehicle position of the other vehicle (hereinafter, the other vehicle position) and the time stamp. The other vehicle position acquisition unit 164 sequentially acquires the other vehicle position and time stamp that the wireless communication device 2 of the host vehicle sequentially receives from the wireless communication device 2 mounted on the other vehicle via the short-range communication unit 11. Then, the other vehicle position acquisition unit 164 classifies the other vehicle position sequentially received from the wireless communication device 2 of the other vehicle for each other vehicle position whose transmission source is the same other vehicle, and temporarily stores the other vehicle position in the other vehicle position storage unit 165. Remember me. The other vehicle position accumulating unit 165 is an electrically rewritable memory such as a RAM provided in the portable control unit 16, for example.

  Whether or not the transmission source is the same other vehicle is determined based on this identifier when an identifier such as an ID specifying the transmission source vehicle or the wireless communication device 2 is added to the other vehicle position.

  The road map acquisition unit 166 acquires road map data around the current position from the map management server via the wide area communication unit 15, and temporarily stores the acquired road map data in the road map storage unit 167. The timing for acquiring the road map data around the current position is in the state where the road map is being displayed on the display unit 14 until the vicinity of the boundary of the range that can be drawn by the road map data stored in the road map storage unit 167. When the vehicle has moved. The road map storage unit 167 is also an electrically rewritable memory, and uses, for example, the RAM of the portable side control unit 16.

  The processing of the map matching unit 168 and the map display processing unit 169 will be described later with reference to the flowchart of FIG. Before describing the processing of the map matching unit 168 and the map display processing unit 169, the configuration of the wireless communication device 2 will be described.

  The wireless communication device 2 transmits and receives information by wireless communication with the wireless communication device 2 used in other vehicles existing around the host vehicle. The wireless communication device 2 is not limited to a configuration that is used by being mounted on a vehicle, but may be a configuration in which a device that can be carried by a user (that is, a person) is brought into the vehicle. The wireless communication device 2 includes a short-range communication unit 21, an outside vehicle communication unit 22, and a communication device side control unit 23.

  The short-range communication unit 21 includes a transmission / reception antenna, and exchanges information with the mobile terminal 1 of the host vehicle by performing wireless communication in accordance with, for example, the Bluetooth standard.

  The vehicle exterior communication unit 22 includes a transmission / reception antenna, and transmits / receives information to / from the wireless communication device 2 of another vehicle by wireless communication not via a communication network. That is, vehicle-to-vehicle communication is performed. The inter-vehicle communication may be configured to be performed using, for example, a 700 MHz band radio wave or a 5.9 GHz band radio wave. The vehicle exterior communication unit 22 transmits information at a transmission cycle according to the instruction of the communication device side control unit 23.

  The communicator-side control unit 23 is configured as a normal computer, and includes a well-known CPU, a memory such as a ROM, a RAM, and an EEPROM, an I / O, and a bus line for connecting these configurations (both shown in the figure). (Not shown). The communicator-side control unit 23 executes various processes by causing the CPU to execute programs stored in advance in the ROM based on various information input from the short-range communication unit 21 and the outside-vehicle communication unit 22.

  The communicator-side control unit 23 transmits a vehicle position and time stamp acquisition request to the mobile terminal 1 of the host vehicle via the short-range communication unit 21, and is returned from the mobile terminal 1 in response to the acquisition request. Information such as the position of the coming vehicle is acquired via the short-range communication unit 21. Note that the mobile terminal 1 may transmit the vehicle position stored in the own vehicle position storage unit 152 and the time stamp associated with the vehicle position at regular intervals. In this case, the communicator-side control unit 23 acquires the vehicle position and time stamp transmitted from the mobile terminal 1 at regular intervals via the short-range communication unit 21.

  And the communication apparatus side control part 23 transmits the vehicle position and time stamp which were acquired from the portable terminal 1 of the own vehicle via the communication part 22 outside a vehicle.

  Further, the vehicle exterior communication unit 22 receives the other vehicle position transmitted from the wireless communication device 2 of the other vehicle. The communicator side control unit 23 transmits the other vehicle position received by the outside communication unit 22 to the mobile terminal 1 of the host vehicle via the short-range communication unit 21.

  Next, processing of the map matching unit 168 and the map display processing unit 169 of the mobile terminal 1 will be described with reference to the flowchart of FIG. The process shown in FIG. 3 is executed for each predetermined drawing update period in a state where the road map is displayed on the display unit 14. The road map is displayed on the display unit 14 when, for example, a predetermined application for displaying the road map is activated by a user operation.

  Steps S2 and S4 are processes performed by the map matching unit 168. First, in step S2, the other vehicle position received in the past fixed time with the current time as a reference is targeted, and the other vehicle position located in the peripheral range is determined. The peripheral range is a range including the position of the host vehicle, and is set to a range narrower than the map display range.

  FIG. 4 is a diagram for explaining the peripheral range 30 and the map display range 40. In the example of FIG. 4, the peripheral range 30 is defined as a display range. Specifically, the peripheral range 30 is a circle with a radius r1 centered on the host vehicle figure 50 representing the position of the host vehicle. On the other hand, the map display range 40 is an entire range of the road map displayed on the display unit 14, and is a rectangular range including the peripheral range 30.

  The radius r1 is a display length, and the actual distance corresponding to the radius r1 varies depending on the scale of the map displayed on the display unit 14. Therefore, in this step S2, an actual distance corresponding to the radius r1 is calculated based on the map scale. Further, the straight line distance between the other vehicle position and the host vehicle is also calculated. Then, the other vehicle position whose straight line distance to the own vehicle is shorter than the actual distance corresponding to the radius r <b> 1 is determined as the other vehicle position located in the peripheral range 30.

  In subsequent step S4, map matching of other vehicle positions is performed only in the other vehicle positions determined to be located in the peripheral range 30 in step S2. Map matching may be performed by a known method. For example, the traveling locus of the other vehicle is determined by using the predetermined number of other vehicle positions accumulated in the other vehicle position accumulation unit 165 for each transmission source. Then, matching is performed so that the travel locus is positioned on the road on the road map. After the travel locus is positioned on the road, the coordinates (latitude and longitude) of the latest other vehicle position constituting the travel locus are determined as the coordinates for displaying the other vehicle graphic 60. Further, it is also determined in which direction the other vehicle is traveling on the matched road from the direction in which the travel locus extends. This direction is used to determine the display direction of the other vehicle graphic 60.

  In subsequent step S6, a map matching process is performed on the vehicle position. The map matching process in step S6 is the same as the process in step S4 except that the travel locus is created from the vehicle position arranged in time series.

  In the subsequent step S8, the map display range 40 and the peripheral range 30 to be displayed on the display unit 14 are determined from the current position of the host vehicle and the map scale at the current time. Then, the map of the map display range 40 is deformed so that the scale outside the peripheral range 30 is smaller than the scale of the peripheral range 30. Specifically, in the present embodiment, the road map in the map display range 40 is deformed so that the scale continuously decreases as the distance from the host vehicle position increases.

  In step S10, the other vehicle figure 60 is arranged at the coordinates indicated by the other vehicle position existing in the map display range 40 in the road map after the deformation in step S8. The other vehicle position where the other vehicle graphic 60 is arranged is the other vehicle position after the map matching is performed within the peripheral range 30. On the other hand, for the outside of the peripheral range 30, the other vehicle position stored in the other vehicle position storage unit 165 is used. Further, the host vehicle figure 50 is arranged at the coordinates indicated by the host vehicle position after the map matching process is performed in step S6.

  In step S12, the road map in which the other vehicle graphic 60 and the own vehicle graphic 50 created in step S10 are arranged is displayed on the display unit 14. An example of this display is shown in FIG. In FIG. 5, the peripheral range is indicated by a broken-line circle. However, for convenience of explanation, the broken-line circle is not actually displayed.

  The other vehicle figure 60 outside the peripheral range 30 is not located on the road because it is displayed at the other vehicle position where map matching is not performed. However, since the scale outside the peripheral range 30 is smaller than the inside of the peripheral range 30, it is less noticeable that the other vehicle figure 60 is not on the road as much as the scale is small.

  As a comparison, FIG. 6 shows a diagram in which the host vehicle graphic 50 and the other vehicle graphic 60 are displayed on a road map that has the same scale as the peripheral range 30 outside the peripheral range 30. The other vehicle position displaying the other vehicle graphic 60 is the same as in FIG. Moreover, the size of the own vehicle figure 50 and the other vehicle figure 60 is also the same as FIG. From the comparison between FIG. 6 and FIG. 5, it can be seen that FIG. 5 is less noticeable that the other vehicle figure 60 is not on the road.

  As described above, in the present embodiment, map matching is performed for other vehicle positions in the peripheral range 30 of the host vehicle set in a range narrower than the map display range 40. However, even within the map display range 40, map matching is not performed for other vehicle positions outside the peripheral range 30 (map matching unit 168, S4). Therefore, the processing load for performing map matching can be reduced as compared with the case where map matching is performed for all other vehicle positions located within the map display range 40.

  Further, the outside of the peripheral range 30 is displayed with a scale smaller than that of the peripheral range 30. Therefore, even if the position of the other vehicle graphic 60 to be displayed outside the peripheral range 30 is not on the road, it becomes difficult to understand the difference between the other vehicle graphic 60 and the road. Will be less.

  In particular, in the present embodiment, the other vehicle graphic 60 displayed outside the peripheral range 30 is the same size as the other vehicle graphic 60 displayed in the peripheral range 30. This makes it difficult to understand the difference between the other vehicle graphic 60 and the road than when the size of the other vehicle graphic 60 displayed outside the peripheral range 30 is reduced according to the scale. There is less discomfort for those who see the road map.

Second Embodiment
Next, a second embodiment will be described. In the following description of the second embodiment, elements having the same reference numerals as those used so far are the same as elements having the same reference numerals in the previous embodiments unless otherwise specified. In addition, when only a part of the configuration is described, the embodiment described above can be applied to other parts of the configuration.

  In 2nd Embodiment, the magnitude | size of the other vehicle figure 60 represented on the road map displayed on the display part 14 differs from 1st Embodiment. FIG. 7 illustrates a road map displayed on the display unit 14 in the second embodiment. As shown in FIG. 7, in the second embodiment, the size of the other vehicle graphic 60 is reduced as the map scale at the position where the other vehicle graphic 60 is displayed is smaller than the map scale of the peripheral range 30. ing. The scale of the road map is the same as in the first embodiment, and the scale is continuously reduced as the distance from the host vehicle position increases. Therefore, the size of the other vehicle graphic 60 becomes smaller as the distance from the own vehicle graphic 50 increases. As described above, when the scale within the peripheral range 30 is not uniform, the scale at the center of the peripheral range 30 is used as the scale of the peripheral range 30 for determining the size of the other vehicle graphic 60.

  Since the map scale of the road map is not uniform, the actual distance between the host vehicle figure 50 and the other vehicle figure 60 is difficult to understand only by the distance on the screen between the host vehicle figure 50 and the other vehicle figure 60. However, in the second embodiment, the size of the other vehicle graphic 60 is reduced as the map scale at the position where the other vehicle graphic 60 is displayed is smaller than the scale of the peripheral range 30. Therefore, the other vehicle graphic 60 displayed outside the peripheral range 30 is smaller than the other vehicle graphic 60 displayed in the peripheral range 30.

  As a result, the other vehicle graphic 60 displayed outside the peripheral range 30 is displayed outside the peripheral range 30 as compared to the case where the other vehicle graphic 60 displayed within the peripheral range 30 is the same size. The actual distance to the other vehicle figure 60 is felt far. That is, the distance to the other vehicle indicated by the other vehicle graphic 60 displayed outside the peripheral range 30 recognized by the person viewing the displayed road map becomes closer to the actual distance.

  In particular, in the second embodiment, the size of the other vehicle graphic 60 is made smaller as the map scale at the position where the other vehicle graphic 60 is displayed is smaller. Thereby, the person who sees the displayed road map becomes highly likely to recognize a distance close to the actual distance as the distance to the other vehicle indicated by the other vehicle graphic 60.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment, The following modification is also contained in the technical scope of this invention, Furthermore, the summary other than the following is also included. Various modifications can be made without departing from the scope.

<Modification 1>
For example, in the above-described embodiment, the position measured by the mobile terminal 1 of the host vehicle is set as the vehicle position of the host vehicle, but the present invention is not necessarily limited thereto. For example, when the wireless communication device 2 includes a satellite positioning system receiver such as the GPS receiver 13, the position of the wireless communication device 2 of the own vehicle that can be detected by using this receiver is determined as follows. It is good also as a vehicle position.

<Modification 2>
In the first and second embodiments, the scale of the road map including the peripheral range 30 is continuously reduced as the distance from the vehicle position increases. However, it is not limited to this. As shown in FIG. 8, the surrounding area 30 may have the same scale. In this case, the scale outside the peripheral range 30 may be reduced as the distance from the host vehicle increases, or may be a constant scale.

<Modification 3>
In the above-described embodiment, the other vehicle position is received by inter-vehicle communication. However, the present invention is not limited to this, and the other vehicle position may be received from a roadside device installed at an intersection or the like.

<Modification 4>
In addition to the host vehicle figure 50 and the other vehicle figure 60, a figure indicating a moving body such as a pedestrian may be displayed on the road map displayed on the display unit 14. The position of a mobile object such as a pedestrian is configured to be transmitted by a portable terminal carried by the pedestrian or the like, and this position is set to the wide-area communication unit 15 or the short-range communication unit 11 of the portable terminal 1 used in the host vehicle or wirelessly. Received by the communication device 2.

<Modification 5>
In the above-described embodiment, the host vehicle that receives the position of the other vehicle creates the travel locus of the other vehicle from the position of the other vehicle and performs map matching. However, the present invention is not limited to this. Another vehicle may create a travel locus and transmit the created travel locus.

<Modification 6>
In the above-described embodiment, the peripheral range 30 is determined based on the display size, but the present invention is not limited to this. The size of the peripheral range 30 may be determined by an actual distance. In this case, depending on the display scale, the entire map display range may be a peripheral range. However, if the peripheral range is narrower than the map display range on at least one display scale, the present invention can be applied to that display scale.

<Modification 7>
Moreover, in the above-mentioned embodiment, although the structure which applies the portable terminal 1 as another vehicle position display apparatus was shown, it does not necessarily restrict to this. For example, as long as it is a device that can communicate with the wireless communication device 2 and is used in a vehicle, an on-vehicle navigation device, an on-vehicle ECU, or the like may be used as the other vehicle position display device. In this case, the position detector 12 may have a role played by the position detector of the in-vehicle navigation device. Moreover, what is necessary is just to make the role of the display part 14 the structure which a vehicle-mounted display plays.

1: mobile terminal (other vehicle position display device) 2: wireless communication device 11: short-range communication unit 12: position detector 13: GPS receiver 14: display unit 15: wide area communication unit 16: Mobile side control unit, 21: Near field communication unit, 22: Outside vehicle communication unit, 23: Communication device side control unit, 30: Peripheral range, 40: Map display range, 50: Own vehicle figure, 60: Other vehicle figure, 152 : Host vehicle position storage unit, 161: host vehicle position acquisition unit, 162: host vehicle position storage unit, 163: position transmission processing unit, 164: other vehicle position acquisition unit, 165: other vehicle position storage unit, 166: road map Acquisition unit, 167: road map storage unit, 168: map matching unit, 169: map display processing unit

Claims (1)

Used in vehicles,
Other vehicle position acquisition unit (164) for acquiring other vehicle position, which is the position of the other vehicle, by wireless communication;
Based on the fact that the other vehicle position acquired by the other vehicle position acquisition unit is within the peripheral range of the host vehicle set to a range narrower than the map display range, the other vehicle position is positioned on the road of the map. A map matching unit that performs map matching but does not perform map matching for other vehicle positions when the other vehicle position acquired by the other vehicle position acquisition unit is outside the peripheral range. When,
On the predetermined display unit (14), a road map which is a road map of the map display range and whose scale outside the peripheral range is smaller than the scale of the peripheral range is displayed, and the other vehicle For other vehicles where the other vehicle position acquired by the position acquisition unit is within the peripheral range, it is determined that the other vehicle exists at the other vehicle position after the map matching on the road map. The other vehicle position displayed by the other vehicle position acquisition unit is displayed within the map display range but outside the peripheral range. A map display processing unit (169) for displaying the other vehicle graphic at the other vehicle position acquired by the other vehicle position acquisition unit ;
The map display processing unit makes the other vehicle graphic displayed outside the peripheral range smaller as the scale of the position for displaying the other vehicle graphic becomes smaller than the scale of the peripheral range. Position display device.

Images