JP4924987B2 - Vehicle map display device - Google Patents

Description

  The present invention relates to a vehicle map display device used in a car navigation system or the like.

JP 2006-313144 A

  There are mainly two methods for displaying the traveling direction of a vehicle on a map in a car navigation system. One is a method of rotating the map each time according to the vehicle traveling direction specified using the GPS or the gyroscope so that the vehicle traveling direction is always upward on the map display screen (so-called heading up). On the other hand, the map is fixed so that the north is always upward on the map display screen, and the vehicle traveling direction is changed to the specified direction each time and displayed (so-called north-up). ). In the case of north-up, the orientation of the map on the screen is fixed. Therefore, if the driver has a sufficient sense of direction, there is an advantage that the absolute position and traveling direction on the map of the vehicle can be always accurately grasped. However, if there is a change in the detected vehicle traveling direction, the display direction on the screen also changes. For example, when the vehicle is traveling southward, the actual traveling direction of the vehicle is the map traveling direction. If you are not used to it, you may misunderstand the direction of turning left or right.

  On the other hand, in the heading up, both the traveling directions on the displayed map are always fixed upward, and the map rotates on the screen accordingly, so it is difficult to grasp the direction, but the actual traveling direction of the vehicle is Since it always coincides with the traveling direction on the map, it is easy to determine the right or left turn direction while viewing the map. In addition, since the direction of a landmark or the like that can be seen from the inside of the vehicle matches the direction displayed on the map, it is easy to check the current position.

  On the other hand, a display of a car navigation system has been conventionally attached to, for example, a front panel of a vehicle instrument panel or a console portion so that the horizontal direction of the screen coincides with the horizontal direction when viewed from the traveling direction of the vehicle. In heading-up, there is no sense of incongruity in this case because when the traveling direction on the map is defined in the vertical direction of the screen, this matches the actual traveling direction of the vehicle. However, since the display screen is viewed from an oblique side, the map is especially suitable for a car navigation system in which the display is placed close to the windshield (that is, away from the driver in the direction of travel). There is a problem that the display contents are difficult to see. Therefore, in order to solve this problem, an increasing number of vehicles are mounted with the display tilted in a horizontal plane so that the screen normal is in the direction of looking at the driver.

  However, if the display is tilted in the horizontal plane and the traveling direction on the map is set in the vertical direction of the screen, the traveling direction on the map is deviated from the actual traveling direction of the vehicle because the display is tilted with an inclination in the horizontal plane. There is a drawback that it is displayed and tends to cause a sense of incongruity.

  An object of the present invention is to improve the degree of matching between the traveling direction on the map visually recognized on the screen and the actual traveling direction of the vehicle in a map display device in which the display is tilted in a horizontal plane, and a sense of incongruity derived from the deviation between the two. It is in the point which makes it hard to produce.

Means for Solving the Problems and Effects of the Invention

In order to solve the above problems, a map display device for a vehicle according to the present invention provides:
A display attached with the screen tilted in such a way as to produce an inclination in at least a horizontal plane with respect to the vehicle traveling direction;
A current location identifying means for identifying the current location of the vehicle;
Map display means for displaying a map including the identified current location on the screen of the display;
A travel direction identifying means on the map for identifying the travel direction on the map, which is the travel direction of the vehicle on the map,
The map display means is the display attached with the in-plane tilt angle as the reference indicating direction indicating the traveling direction on the map when the display screen is mounted with the in-plane tilt angle zero. The map is rotated in the plane of the screen so that the travel direction on the map is closer to the actual travel direction of the vehicle than the standard map display state where the travel direction on the map matches the reference indication direction. It is characterized by displaying.

  According to the configuration of the present invention, when the vertical direction of the screen of the display is set as the reference indicating direction (the direction of travel on the map when the display is attached with a zero in-plane inclination as before), the display is attached with an in-plane inclination. The travel direction on the map is closer to the actual travel direction of the vehicle than the standard map display state (that is, the conventional map display state) in which the travel direction on the map matches the reference indication direction on the display screen. Rotate and display the map on the screen. As a result, the degree of matching between the traveling direction on the map visually recognized on the screen and the actual traveling direction of the vehicle is increased, and it is possible to reduce a sense of incongruity caused by the deviation between the two.

  For example, when applied to a car navigation system or the like, the map display device of the present invention has a display on the side closer to the front passenger seat when viewed from the user seated in the driver's seat of the vehicle, and the side closer to the driver's seat on the left and right ends of the screen is the traveling direction. The front side can be inclined and arranged so that the far side is located on the rear side in the running direction. Thereby, the screen on which the map is displayed faces the driver side, so that the map display contents are easier to see. In this case, the map display means displays the map on the screen in a state where it is rotated within the screen surface so that the traveling direction on the map is inclined toward the driver's seat from the reference instruction direction defined in the vertical direction of the screen. Can do. In other words, the display arranged in an inclined manner as described above is displayed by rotating the map so that the traveling direction on the map is inclined toward the driver's seat side because the driver's seat side is located on the front side in the traveling direction among the left and right ends. Thus, the degree of matching between the traveling direction on the map and the actual traveling direction can be effectively increased.

  Next, if an instruction character indicating the traveling direction on the map is displayed at the current location on the map, it becomes easier to visually grasp the current traveling direction of the vehicle on the map. In this case, the instruction character display means is configured to display the instruction character so as to be tilted together with the map in a direction approaching from the reference instruction direction to the actual traveling direction of the vehicle. Naturally, it is desirable to increase the degree of matching with the traveling direction.

  It is desirable that the pointing character is fixedly displayed at a fixed position on the screen from the viewpoint of facilitating understanding of the current location and the traveling direction. In this case, the map display means may display the map in a state of being rotated around the display position of the instruction character within the plane of the screen. Further, the map display means scrolls the map diagonally backward on the screen in a direction opposite to the direction of travel on the map indicated by the inclined instruction character as the current location changes along the direction of travel on the map. By doing so, the progress of the vehicle can be realistically realized by the map scroll reflecting the actual traveling direction.

  The map display means can display the map two-dimensionally on the screen so that the map surface is parallel to the screen. In this case, it is desirable that the rotation angle of the map be set equal to the in-plane inclination angle of the display in order to increase the degree of matching between the traveling direction on the map and the actual traveling direction.

  On the other hand, the map display means can be configured to display a map on the screen in a three-dimensional overhead view with the map surface virtually tilted in the depth direction of the screen. In this case, when the map rotation angle when the depth direction tilt angle of the map surface is considered to be zero is set as a reference rotation angle equivalent to the in-plane tilt angle of the display, an increase with respect to the reference rotation angle increases as the depth direction tilt angle increases. It is desirable to provide rotation angle correction means for correcting the rotation angle of the map so that the difference in direction becomes large. That is, when it is configured so that a three-dimensional bird's-eye view display of a map is possible, the map surface is virtually inclined in the screen depth direction and is visually recognized as an orthographic projection image on the screen. The visual angle displacement from the reference indication direction of the traveling direction on the map increases as the (virtual) depth direction inclination angle (that is, the bird's-eye view angle of the map surface) of the map surface increases due to the orthographic projection. Therefore, a three-dimensional bird's-eye view display of the map is performed by providing a rotation angle correction that corrects the rotation angle of the map so that the difference in the increase direction with respect to the reference rotation angle increases as the tilt angle in the depth direction increases. Even in this case, the degree of matching between the traveling direction on the map and the actual traveling direction can be favorably maintained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing an example of the electrical configuration of a car navigation system incorporating the function of the map display device of the present invention. The car navigation system 100 includes a position detector 1, a map data input device 6, an operation switch group 7, a remote control (hereinafter referred to as “remote control”) sensor 11, a voice synthesis circuit 24 for performing voice guidance, a speaker 15, a nonvolatile memory 9, A display 10, a hard disk device (HDD) 21, a control circuit 8 to which they are connected, a remote control terminal 12, and the like are provided.

  The position detector 1 is a main part of the current location specifying means. From the well-known geomagnetic sensor 2, the gyroscope 3 that detects the rotational angular velocity of the vehicle 101, the distance sensor 4 that detects the travel distance of the vehicle 101, and the satellite. It has a GPS receiver 5 that detects the position of the vehicle 101 based on the radio wave. Since these sensors 2, 3, 4, 5 have errors of different properties, they are configured to be used while being complemented by a plurality of sensors. Depending on the accuracy, some of the above-described sensors may be used, and further, a steering rotation sensor or a wheel sensor of each rolling wheel, such as a vehicle speed sensor 23, may be used.

  As the operation switch group 7, for example, a touch panel 22 integrated with the display 10 or a mechanical switch is used. The touch panel 22 is an area where an electric circuit is wired in the X-axis direction and the Y-axis direction through a gap called a spacer on a glass substrate and a transparent film on the screen of the display 10. Since the voltage value changes due to short-circuiting of the wiring, a so-called resistive film method of detecting this as a two-dimensional coordinate value (X, Y) is widely used. In addition, a so-called capacitance method may be used. In addition to the mechanical switch, a pointing device such as a mouse or a cursor may be used.

  It is also possible to input various instructions using the microphone 31 and the voice recognition unit 30. In this method, a voice signal input from the microphone 31 is processed by a voice recognition technique based on a well-known hidden Markov model or the like in the voice recognition unit 30 and converted into an operation command corresponding to the result. Various instructions can be input through the operation switch group 7, the remote control terminal 12, and the microphone 31.

  The transmitter / receiver 13 is connected to a road traffic from a VICS (Vehicle Information and Communication System) center 14 by an optical beacon or a radio beacon output from a transmitter (not shown) provided along the road, for example. It is a device for receiving information or receiving FM multiplex broadcasting. In addition, by communicating with an ETC (Electronic Toll Collection) vehicle-mounted device 16, the fee information received by the ETC vehicle-mounted device 16 from an ETC road device (not shown) can be taken into the navigation device 100. . Further, the ETC vehicle-mounted device 16 may be connected to an external network and communicate with the VICS center 14 or the like. Communication unit 25 includes a transmission unit, a reception unit, and an antenna for transmitting and receiving data to and from control center 105. Since the configurations of the transmission unit, the reception unit, and the antenna are well known, detailed description thereof is omitted.

  Next, the control circuit 8 is configured as a normal computer, and has a well-known CPU 81, ROM 82, RAM 83 and input / output unit 84 connected by a bus line 85. The CPU 81 controls the navigation program 21p and data stored in the HDD 21. The CPU 81 also controls the reading / writing of data to / from the HDD 21. The A / D conversion unit 86 includes a well-known A / D (analog / digital) conversion circuit, and converts analog data input from the position detector 1 or the like to the control circuit 8 into digital data that can be calculated by the CPU 81, for example. It is. The ROM 82 may store a program for performing a minimum necessary operation among the navigation functions when the HDD 21 fails. Further, the drawing unit 87 generates display screen data to be displayed on the display 10 from display data and display color data stored in the HDD 21 or the like.

  In addition to the navigation program 21p, the HDD 21 stores so-called map matching data for improving the accuracy of position detection, and map data 21m including road data representing road connections. The map data 21m stores predetermined map image information for display and road network information including link information and node information. The link information is predetermined section information constituting each road, and includes position coordinates, distance, required time, road width, number of lanes, speed limit, and the like. The node information is information that defines an intersection (branch road) and the like, and includes position coordinates, the number of right / left turn lanes, a connection destination road link, and the like. In addition, data indicating whether or not traffic is possible is set in the inter-link connection information.

  In addition, in the HDD 21, auxiliary information for route guidance, entertainment information, and other data can be written independently by the user and stored as user data 21u. These user data 21 u can be rewritten by operating the operation switch group 7, the touch panel 22 and the remote control terminal 12 or by voice input from the microphone 31. Further, data and various information necessary for the operation of the navigation device 100 may be stored as the database 21d.

  The navigation program 21p, the map data 21m, and the user data 21u can be added / updated from the storage medium 20 via the map data input device 6. The storage medium 20 is generally a CD-ROM or DVD based on the amount of data, but may be another medium such as a memory card. Moreover, you may use the structure which downloads data via an external network.

  The non-volatile memory 9 is constituted by a rewritable semiconductor memory such as an EEPROM (Electrically Erasable & Programmable Read Only Memory) or a flash memory, and information and data necessary for the operation of the navigation device 100. Is remembered. The nonvolatile memory 9 is configured to retain the stored contents even when the accessory switch of the vehicle 101 is turned off, that is, the navigation device 100 is turned off. Further, information and data necessary for the operation of the navigation device 100 may be stored in the HDD 21 instead of the nonvolatile memory 9. Furthermore, information and data necessary for the operation of the navigation device 100 may be stored separately in the nonvolatile memory 9 and the HDD 21.

  The display 10 is formed of a known color liquid crystal display, and includes a dot matrix LCD (Liquid Crystal Display) and a driver circuit (not shown) for performing LCD display control. The driver circuit performs map display based on the display command and display screen data sent from the control circuit 8. The display 10 may be an organic EL (ElectroLuminescence) display or a plasma display.

  The speaker 15 is connected to a well-known voice synthesis circuit 24, and digital voice data stored in the nonvolatile memory 9 or the HDD 21 is converted into analog voice by the voice synthesis circuit 24 according to a command from the navigation program 21p. Note that the speech synthesis method includes a recording / editing method in which speech waveforms are stored as they are or after being encoded and connected as necessary.

  The vehicle speed sensor 23 which is a notification means of the present invention includes a rotation detection unit such as a known rotary encoder, and is installed near the wheel mounting unit, for example, to detect the rotation of the wheel and send it to the control circuit 8 as a pulse signal. . In the control circuit 8, the number of rotations of the wheel is converted into the speed of the vehicle 101 to calculate an expected arrival time from the current position of the vehicle 101 to a predetermined place, or an average vehicle speed for each travel section of the vehicle 101. To do.

  A LAN (Local Area Network) I / F 26 is an interface circuit for exchanging data with other in-vehicle devices and sensors via the in-vehicle LAN 27. Further, data may be taken from the vehicle speed sensor 23 or connected to the ETC on-vehicle device 16 via the LAN I / F 26.

  With this configuration, the car navigation system 100 allows the user to operate the operation switch group 7, the touch panel 22, the remote control terminal 12, or from the microphone 31 when the navigation program 21 p is activated by the CPU 81 of the control circuit 8. When route guidance processing for displaying a destination route on the display 10 is selected from a menu displayed on the display 10 by voice input, the following processing is performed.

  That is, when the user selects a point from a given point or facility search or address search on the map, a registered point set by the user, etc., and sets it as a destination, the current position of the vehicle 101 is obtained by the position detector 1, A process for obtaining an optimum guide route from the current position to the destination is performed. Then, the guide route is displayed on the road map on the display 10 so as to guide an appropriate route to the user. As a method for automatically setting an optimum guide route, a method such as the Dijkstra method is known. In addition, at least one of the display 10 and the speaker 15 is used to notify a message according to an operation guidance or an operation state.

  Next, as shown in FIG. 2, the display 10 is closer to the front passenger seat as viewed from the user seated in the driver's seat of the vehicle, and the side closer to the driver's seat on the left and right ends of the screen is the traveling direction (actual traveling direction: D0). ) Inclined at an in-plane inclination angle θ so that the far side is located on the rear side in the running direction. Specifically, the display 10 is fitted to the position on the left side of the steering wheel of the instrument panel (to the left of the cockpit where a meter or the like is arranged (the opposite is true in the case of a right-hand drive vehicle). As shown in Fig. 3, since the screen SCR on which the map MP is displayed faces the driver DRV side, the map display contents are easier to see, and on the screen SCR of the display, the map MP and the on-map traveling direction Ad are It is displayed in a state of being rotated in the screen SCR plane so as to be inclined toward the driver's seat from the reference instruction direction defined in the vertical direction of the screen SCR.

  In many conventional vehicles, the display 10 is often attached at right angles to the actual traveling direction D0. In the heading-up display mode, the vertical direction of the screen SCR is the traveling direction on the map. The direction of travel on this map matches the actual direction of travel, and there is no particular problem. However, when the screen SCR (display) is mounted with an in-plane tilt angle θ as described above, the driver's seat side is located on the front side in the traveling direction among the left and right ends of the screen SCR. As shown in the figure, when the map display is performed using the conventional form in which the vertical direction of the screen SCR is set as the reference instruction direction and the traveling direction Ad ′ on the map is combined with this, the traveling direction Ad ′ on the map is determined from the actual traveling direction. It will be shifted by the in-plane inclination angle θ, and a sense of incongruity will be felt due to the discrepancy between the traveling direction of the vehicle and the traveling direction Ad ′ on the map. Therefore, if the map MP is rotated from this state and the traveling direction Ad on the map is tilted toward the driver's seat from the state coincident with the reference instruction direction defined in the vertical direction of the screen SCR as shown in FIG. The degree of matching between the traveling direction Ad and the actual traveling direction is increased, and the above-mentioned feeling of strangeness can be effectively reduced. In addition, the code | symbol ND in a figure shows the plane orthogonal to an actual advancing direction.

  As shown in FIG. 3, the map MP is two-dimensionally displayed so that the map surface is parallel to the screen SCR. The rotation angle of the map MP is determined to be equal to the in-plane inclination angle θ of the display 10. The current location information specified by the GPS receiver 5 (FIG. 1) is plotted at the corresponding position on the map MP (current location specifying means). An instruction character DI indicating a travel direction Ad on the map (an arrow figure indicating the travel direction Ad on the map is used by the instruction character) is displayed at the current location. This instruction character DI (Ad) is displayed with an inclination along with the map MP in a direction approaching from the reference instruction direction to the actual traveling direction D0 of the vehicle.

  The instruction character DI is fixedly displayed at a fixed position on the screen SCR (for example, the screen center position). The map MP is rotated in the plane of the screen SCR so as to approach the actual traveling direction D0 around the display position of the instruction character DI. Then, as the current location changes along the traveling direction Ad on the map, the map MP is scrolled diagonally backward in the direction opposite to the traveling direction Ad on the map indicated by the inclined instruction character DI.

  FIG. 5 is an example of a flowchart showing the flow of a drawing process when route guidance using a map is performed by the car navigation system. In S1, the route to the destination is calculated by a known method, and the traveling direction closest to the current location is determined. In S2, the absolute traveling direction of the vehicle is specified by a known method based on a temporal change in the positioning result by the GPS receiver 5, a temporal change in the acceleration detection direction by the gyroscope 3, or a combination thereof. In S3, the traveling direction on the map is identified by mapping the identified absolute traveling direction on the map data. It is also possible to manually set the traveling direction on the map by a user operation from the touch panel 22.

  Then, the process proceeds to S4, and the identified map traveling direction corresponds to the direction tilted toward the actual traveling direction D0 from the reference indication direction by the in-plane tilt angle θ of the display in FIG. 3, that is, the actual traveling direction D0. The rotation angle of the map data is determined so as to coincide with the target direction. In S5, the map is rotated at the determined rotation angle, drawn on the screen SCR, and an instruction character DI indicating the traveling direction Ad on the map is overlaid. In this embodiment, the screen SCR has a rectangular shape determined so that the upper and lower edges are horizontal, and the target direction is determined to intersect the upper and lower edges of the screen SCR at an angle (in-plane tilt angle) θ. It has been.

  When the map is displayed in a heading-up manner, the absolute traveling direction of the vehicle can be specified by a well-known method that uses the integrated value of the angular acceleration detected value by the gyroscope 3 and corrects this by the temporal change of the GPS positioning result. In the conventional case, the angle of the map is changed every moment so that the specified absolute traveling direction coincides with the vertical direction of the display 10. The instruction character DI indicating the traveling direction of the vehicle is in a transition state when the road is linearly curved or bent, and the instruction character DI is displayed as a transition state while the map gradually rotates according to the change in the traveling direction. The direction deviated from the vertical direction may be indicated, but when traveling on a straight line or a road close thereto, the indication character DI is displayed so as to face directly above the display 10. In the embodiment of the present invention, the in-plane inclination angle θ of the display 10 is known, and the rotation angle of the map display is corrected in a form that always takes this into consideration.

  However, if the mounting form of the gyroscope 3 is devised, the in-plane inclination angle θ can be specified from the output information of the gyroscope 3 even if the in-plane inclination angle θ of the display 10 is not known in advance, and the map rotation is corrected. it can. An example is shown in FIG. The gyroscope 3 is assumed to be configured by a 3D gyro sensor in which an acceleration sensor is combined with a known vibration type angular velocity sensor. The angular velocity generated when the vehicle is traveling on a curve is reflected in the amplitude of the lateral vibration derived from the Coriolis force on the weight forcedly vibrated in the vertical direction at a constant frequency in the vibration type angular velocity sensor. To detect. The acceleration sensor is mounted so that the acceleration detection direction coincides with the front direction of the vehicle in a horizontal plane, and when traveling at a constant speed in a gradient section, the acceleration component in the gradient direction and the gravity force in the gradient direction, The angle can be detected. In the conventional car navigation system, the 3D gyro sensor 3 is attached so that the detection direction of the lateral vibration is horizontal in an upright virtual plane whose normal is the vehicle traveling direction. In addition, the screen of the display 10 was almost parallel to the upright virtual plane.

In the present invention, the display 10 is attached to the vehicle in a tilted manner with an in-plane tilt angle θ. As shown in FIG. 9, the 3D gyro sensor 3 is placed on the back surface of the display 10 and the acceleration detection direction x is the display screen method. It is attached so that it coincides with the line direction and the angular velocity detection direction y coincides with the horizontal direction of the screen. As a result, the angular velocity signal detection direction y is inclined in the horizontal plane by θ from the beginning with respect to the upright virtual plane perpendicular to the traveling direction of the vehicle. Then, even when the vehicle travels straight, acceleration in the straight traveling direction is detected by the acceleration sensor and the angular velocity sensor as component force components α _x and α _{y in the} detection directions x and y, respectively. If the in-plane tilt angle of the display is θ,
tan θ = (α _y / α _x )
Because
θ = Tan ⁻¹ (α _y / α _x )
If the calculated value of θ is stored in the RAM 83 (FIG. 1), the rotation angle of the map display can be corrected in the same manner as described above. In this case, the in-plane tilt angle θ may be calculated and stored only once when linear acceleration is first performed after the IG switch is turned on. However, when the mounting angle (in-plane tilt angle θ) of the display 10 with respect to the vehicle is variable, the in-plane tilt angle θ is recalculated every time linear acceleration (or during deceleration) is performed, and the mounting angle of the display 10 changes. In this case, the stored in-plane inclination angle θ can be updated with a new calculation value each time.

The output of the 3D gyro sensor 3 is also used for map matching processing by self-contained navigation in the car navigation device. However, when the display 10 is mounted at an angle as described above, even during straight acceleration / deceleration, the vehicle is traveling in a curve. In the same manner as described above, the angular velocity in the y direction is detected. In this case, once the in-plane inclination angle θ is identified, thereafter, it uniquely corresponds to the acceleration detection value α _x in the x direction,
Δα _y = α _x · tan θ
Since the apparent angular velocity value Δα _y is generated only, the apparent angular velocity value Δα _y is subtracted from the actual angular velocity detected value α _y .
αy ′ = α _y −Δα _y
May be adopted as a true angular velocity value when performing map matching.

  Next, as shown in FIG. 6, the map MP can be displayed in a three-dimensional overhead view with the map surface virtually tilted in the depth direction of the screen SCR. In this case, as shown at the top of FIG. 7, when the inclination angle φ in the depth direction of the map MP plane is considered to be zero (that is, in the case of two-dimensional display), the rotation angle of the map MP is the reference rotation angle (display 10 is equivalent to the in-plane inclination angle θ), the map MP is rotated so that the increment Δθ with respect to the reference rotation angle θ increases as the depth direction inclination angle φ increases as shown in FIG. Correct the angle. The angle θ′≡θ + Δθ represents a deviation angle from the reference instruction direction of the on-map traveling direction (instruction character) visually recognized on the screen SCR when a depth direction inclination angle φ is generated in the map MP.

As shown in FIG. 8, the deviation angle θ ′ in the case where the depth direction inclination angle φ is generated is calculated when the perspective correction of the horizontal scale of the map is not performed.
θ ′ = Sin ⁻¹ (sin θ / cos φ)
Can be expressed as In addition, when using perspective correction, if the display reduction ratio in the horizontal direction of the map when the distance L is advanced from the screen SCR in the depth direction is α (L),
θ ′ = Sin ⁻¹ (α (L) · sin θ / cos φ)
Can be expressed as If θ ′ is calculated in this way, the map is rotated and displayed so that the traveling direction Ad on the map coincides with the direction of θ ′ as described above. Thereby, even when the three-dimensional bird's-eye view display of the map is performed, the degree of matching between the traveling direction on the map and the actual traveling direction can be maintained well.

  Note that the display 10 can be attached with a variable inclination angle in the front-rear direction in the passenger compartment. In this case, as shown in FIG. 6, when the inclination angle of the display itself is Δφ, the map MP is visually recognized in a form in which the depth direction inclination angle φ is further increased by Δφ, so that φ is φ + Δφ. Θ ′ may be calculated as follows to rotate the map. In addition, the display 10 can be configured so that the angle in the left-right direction (that is, the in-plane inclination angle) θ is variable. In this case, the value of the changed in-plane inclination angle θ is acquired each time, and the above calculation and map rotation may be performed.

The block diagram which shows an example of the electrical constitution of the car navigation system used as the application object of the map display apparatus for vehicles of this invention. Explanatory drawing which shows an example of mounting embodiment of a display. Explanatory drawing which shows the 1st display example of the map display apparatus for vehicles which concerns on this invention. Explanatory drawing which shows the comparative example which concerns on the example of a display of FIG. The flowchart which shows the flow of a map display process. Explanatory drawing which shows the 2nd display example of the map display apparatus for vehicles which concerns on this invention. The figure explaining the concept of the rotation angle correction | amendment according to the depth direction inclination of the map in FIG. Explanatory drawing which shows the calculation principle of rotation angle correction | amendment. Explanatory drawing which shows another principle of rotation angle correction | amendment.

Explanation of symbols

1 position detector (current location identification means, travel direction identification means on the map)
8 Control circuit (current location identification means, travel direction identification means on the map)
10 Display 87 Drawing part (map display means, rotation angle correction means)
100 car navigation system (map display device)

Claims (4)

A display attached with the screen tilted in such a way as to produce an inclination in at least a horizontal plane with respect to the vehicle traveling direction;
A current location identifying means for identifying the current location of the vehicle;
Map display means for displaying a map including the identified current location on the screen of the display;
A travel direction identifying means on the map for identifying the travel direction on the map, which is the travel direction of the vehicle on the map,
The map display means attaches with the in-plane tilt angle as the reference indication direction indicating the traveling direction on the map when the display screen is mounted with the in-plane tilt angle zero. The travel direction on the map is closer to the actual travel direction of the vehicle than the standard map display state in which the map travels on the screen of the displayed display and the travel direction on the map matches the reference indication direction. , Rotate and display in the plane of the screen ,
The display is tilted so that the side closer to the driver's seat is the front side in the running direction and the far side is the rear side in the running direction as viewed from the user seated in the driver's seat of the vehicle. Arranged,
The map display means is a state in which the map on the screen is rotated in the plane of the screen so that the traveling direction on the map is inclined toward the driver's seat from the reference instruction direction determined in the vertical direction of the screen. Display with
An instruction character display means for displaying an instruction character indicating the advancing direction on the map at a current position on the map in a direction approaching the actual advancing direction of the vehicle from the reference instruction direction;
The map display means obliquely backwards the map on the screen in a direction opposite to the direction of travel on the map indicated by the inclined pointing character as the current location changes along the direction of travel on the map. To scroll to
The map display means displays the map on the screen in a three-dimensional bird's-eye view with the map surface virtually tilted in the depth direction of the screen, and the inclination angle of the map surface in the depth direction is considered to be zero. When the rotation angle of the map in the case is set as a reference rotation angle equivalent to the in-plane inclination angle of the display, the difference in the increasing direction with respect to the reference rotation angle increases as the depth direction inclination angle increases. A map display device for a vehicle, comprising a rotation angle correction means for correcting a rotation angle of a map. An acceleration detection means attached to the display for detecting a first component force component of the acceleration of the vehicle in a screen normal direction of the display and a second component component of the display in a horizontal direction of the screen;
2. The map display device for a vehicle according to claim 1 , further comprising: an in-plane inclination angle calculating means for calculating the in-plane inclination angle based on the first component force component and the second component force component detected by the acceleration detection means. . The acceleration detection means is a 3D gyro sensor in which an acceleration sensor is combined with an angular velocity sensor, and the acceleration detection direction coincides with the screen normal direction of the display, and the angular velocity detection direction coincides with the screen horizontal direction of the display. The map display apparatus for vehicles according to claim 2 attached to the back of said display . The instruction character is fixedly displayed at a fixed position on the screen, and the map display means displays the map in a state of being rotated around the display position of the instruction character in the plane of the screen. The vehicle map display device according to any one of claims 1 to 3 .