JP4182724B2 - Map display device and map display method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a map display device and a map display method capable of displaying a map image, for example.
[0002]
[Prior art]
Conventionally, in a map display application that displays a map image, the display form of the map image displayed differs depending on the place where the map image is used.
For example, typical places for displaying a map image mainly include the interior of a vehicle such as an automobile and the interior of a building such as a general home or office.
In a vehicle such as an automobile, a map image is displayed when displaying the current position of the traveling vehicle as a car navigation system. For this reason, display is usually performed so that the traveling direction of the host vehicle is always on the screen.
On the other hand, when displaying a map image in a general home, etc., for example, the display is always performed with the north direction facing the top of the screen.
[0003]
[Problems to be solved by the invention]
By the way, in the map display application as described above, usually, the place of use is limited in advance, and the map image is displayed in a display form according to the place of use. For this reason, for example, a map display application premised on use in a vehicle cannot display a map image in a display form suitable for use in a general home. Conversely, a map display application that is assumed to be used in a general home cannot display a map image in a display form suitable for use in a vehicle. In particular, the display form of the map image to be displayed differs depending on whether it is used in a vehicle such as an automobile or in other places. There has been a demand for a map display device that can display a map image.
[0004]
[Means for Solving the Problems]
Therefore, the present invention has been made in view of the above points, and provides a map display device and a map display method capable of changing the display mode of a map image depending on whether the vehicle is in a vehicle state or a non-vehicle state. The purpose is to do.
[0005]
To achieve the above object, a map display device of the present invention includes a state determination means for determining whether vehicle state or a non-vehicle condition, according to the determination result of the state decision section, the determination result is in use in the vehicle state In some cases, the map image is displayed as a viewpoint position similar to that of the driver when the map image is displayed in a bird's-eye view display, and when the determination result is used in a non-vehicle state, the viewpoint of the bird's-eye view display Display control means for changing and displaying the viewpoint position of the bird's-eye view image to be displayed is provided so that the map is displayed as a viewpoint position higher than that used in the in-vehicle state .
[0006]
According to the present invention, it is possible to display a map image corresponding to the in-vehicle state or the non-in-vehicle state by changing the display mode of the map image to be displayed according to the determination result of the state determination unit.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a map display device according to an embodiment of the present invention will be described.
Note that the map display device 1 of the present embodiment functions as a map display device in a car navigation system when used in a vehicle such as a car as a vehicle-mounted device. Further, when not used as a vehicle-mounted device, it operates as a map display device capable of displaying a map image alone.
[0008]
FIG. 1 is a diagram showing an example of a schematic structure of a map display device as the present embodiment.
In the map display device 1 shown in FIG. 1, a display unit 2 and an operation unit 3 for various input operations are provided on the front side. Although not shown, a light receiving unit for receiving a command signal from a remote commander (remote controller) using infrared rays or the like is provided on the front surface of the map display device 1.
[0009]
In addition to the above, for example, a remote commander using radio wave transmission, a keyboard or a mouse that can be connected to the map display device 1 by wire or wireless can be considered as the operation means. Furthermore, a touch panel mechanism that detects the pressing operation on the display unit 2 and outputs the operation information as operation information is provided, and an operation as a so-called GUI (Graphical User Interface) that performs a pressing operation on the image displayed on the display unit 2 is performed. It is also conceivable to input by. Furthermore, it is also possible to perform an operation with a joystick or a game pad.
[0010]
Although not shown, the map display device 1 of the present embodiment is configured to be able to store a disc-shaped recording medium such as a CD-ROM or a DVD-ROM in which map information is recorded. The required map image is displayed on the display unit 2 using the map data recorded on these recording media.
[0011]
FIG. 2 is a diagram showing a usage pattern example of the map display device 1 of the present embodiment, and FIG. 2 (a) shows an example when the map display device 1 is used in a vehicle. FIG. 2B shows an example in which the map display device 1 is used on a desk such as a general home.
[0012]
As shown in FIG. 2A, when the map display device 1 is used in an automobile, for example, an in-vehicle installation device (hereinafter referred to as an “in-vehicle cradle”) attached near a dashboard or the like in the vehicle. 4, the map display device 1 is installed, and the supply of power supply voltage is obtained from the cigar power connector 5 via the power cable 6.
Although details will be described later, various signals are sent to the map display device 1 from a GPS (Global Positioning System), an autonomous navigation system device, a microphone, or the like attached to the vehicle via a signal cable 7. Entered. A required map image is displayed based on these signals.
[0013]
On the other hand, as shown in FIG. 2B, when the map display device 1 is used in a general home, for example, a commercial AC voltage from the commercial power supply 8 is converted into a DC voltage of a predetermined level by the AC / DC converter 9. The power supply voltage is supplied.
[0014]
FIG. 3 is a block diagram showing the internal configuration of the map display device 1 of the present embodiment described above.
In FIG. 3, an input unit 21 is an input operation unit for a user to input various information. In addition to the operation unit 3 shown in FIG. 1, the input unit 21 can be configured by a remote controller, a keyboard, a mouse, a touch panel, and the like. It is said.
[0015]
A CPU (Centoral Processing Unit) 22 controls the operation of the entire map display device 1.
Further, the CPU 22 determines whether the map display device 1 is in a vehicle-mounted state or a non-vehicle-mounted state based on various data input via the interface (I / F) 29 and the determination result in the determination unit 32. A discrimination process or the like is performed.
[0016]
A ROM (Read Only Memory) 23 stores various programs for the CPU 22 to execute required processing.
A RAM (Random Access Memory) 24 is, for example, an SRAM (Static Random Access Memory) or a DRAM (Dynamic Random Access Memory), and stores various setting information. A non-volatile memory such as a flash memory may be provided.
[0017]
The disk drive 25 is a part for reproducing map information and various information recorded on a disk-shaped recording medium 28 such as a CD-ROM or a DVD-ROM. The reproduced map information and the like are transferred to and stored in a VRAM (Video Ram) 26 via the bus 33. In addition, a hard disk etc. can also be considered as a recording medium which records map information etc.
[0018]
The VRAM 26 stores drawing data and the like for displaying a map image based on the image data reproduced from the disk-shaped recording medium 28 by the disk drive 25.
The display driver 27 drives the display unit 3 for causing the display unit 2 to display an image corresponding to the drawing data generated in the VRAM 26.
[0019]
The interface (I / F) 29 is provided to connect the map display device 1 to an external device provided on the vehicle side such as an automobile.
Examples of the external device include a GPS (Global Positioning System) 42, a microphone 43, and an autonomous navigation system device 44.
The GPS 42 receives radio waves from the satellite via the antenna 41 and outputs GPS data that is the reception result.
The microphone 43 is provided for collecting noise during travel of the vehicle on which the map display device 1 is mounted. A method of using the noise signal collected by the microphone 43 will be described later.
The autonomous navigation system device 44 includes a vehicle speed sensor 45, an acceleration sensor 46, and a gyro 47.
The vehicle speed sensor 45 detects the traveling speed of the vehicle and outputs a vehicle speed pulse corresponding to the traveling speed.
The acceleration sensor 46 detects the acceleration of the vehicle and outputs acceleration information corresponding to the acceleration.
The gyro 47 detects the azimuth and outputs the detected azimuth data.
[0020]
In this embodiment, the GPS 42 and the autonomous navigation device 44 such as the vehicle speed sensor 45, the acceleration sensor 46, and the gyro 47 are described as external devices. However, this is merely an example. In addition, an optical fiber gyro may be considered as an external device.
[0021]
The noise sensor 30 is provided to determine whether or not the map display device 1 is in an in-vehicle state. Specifically, the noise sensor 30 detects a vibration noise, a power supply noise sensor that detects power noise, an engine. An engine ignition noise sensor for detecting the ignition noise of the engine.
[0022]
The cradle detection unit 31 is a detection unit that detects whether or not the map display device 1 is installed with respect to the in-vehicle cradle 4 attached to a predetermined position in a vehicle such as an automobile. Whether the map display device 1 is installed in the in-vehicle cradle 4 is detected by physical contact with the device 1 or communication between them.
[0023]
Note that the cradle detection unit 31 here may be a detection switch that simply detects a state change from the vehicle-mounted state to the non-vehicle-mounted state, or the non-vehicle-mounted state to the vehicle-mounted state, and the map display device 1 itself is, for example, The vehicle-mounted state may be confirmed by directly communicating with the vehicle-side bus system or the like using a means such as short-range wireless communication.
[0024]
The determination unit 32 determines whether the map display device 1 is in an in-vehicle state based on various input information transferred from the interface 29 via the bus 33 or detection information from the noise sensor 30 or the cradle detection unit 31. A determination of whether or not is made. Then, the determination result is transferred to the CPU 22 via the bus 33. Note that the determination unit 32 is not necessarily provided, and it is possible to determine whether or not the map display device 1 is in a vehicle-mounted state only by the CPU 22.
[0025]
FIG. 4 is a diagram showing the configuration of the map display device 1 according to the present embodiment described so far in the form of functional blocks.
In FIG. 4, the user input function unit 51 is a function unit for acquiring input information from the user, and the input unit 21 shown in FIG. 3 corresponds to the user input function unit 51. The
[0026]
The in-vehicle / non-in-vehicle determination function unit 52 is a function unit that determines whether the map display device 1 according to the present embodiment is in an in-vehicle state or a non-in-vehicle state, and the CPU 22 and the determination unit 32 illustrated in FIG. This corresponds to the in-vehicle / non-in-vehicle determination function unit 52.
In such an in-vehicle / non-in-vehicle determination function unit 52, the microphone 43, the autonomous navigation system device 44, and the like are provided via the input unit 21, the noise sensor 30, the cradle detection unit 31, or the interface 29. Based on various input signals input from an external device, it is determined whether or not the map display device 1 is in a vehicle-mounted state.
[0027]
The processing function unit 53 is a function unit that performs various types of information processing, and corresponds to the CPU 22, the RAM 24, the VRAM 26, and the like illustrated in FIG.
The input information processing unit 54 in the processing function unit 53 extracts information related to the destination spot information acquired by the user input function unit 51 and performs processing.
[0028]
The map information processing unit 55 performs processing for acquiring map information from the map information storage function unit 57 and displaying a map image.
[0029]
The screen drawing processing unit 56 generates a display image to be displayed on the image output function unit 58 based on the screen information processed by the map information processing unit 55. In addition to the above, the processing function unit 53 performs a recommended route process for searching for an optimum route using the map image information processed by the map information processing unit 55.
[0030]
The map information storage function unit 57 is a function unit for storing required map image information. The map information storage function unit 57 is a recording medium 28 such as a CD-ROM or DVD in which map information is recorded, and these disc-shaped recording media 28. It is comprised by the disk drive 25 which drives.
[0031]
The image output function unit 58 corresponds to the display driver 27 and the display unit 2 shown in FIG. 3 and is a function unit that displays an image based on the map image information processed by the processing function unit 53.
[0032]
And the map display apparatus 1 of this Embodiment comprised in this way determines whether it is a vehicle-mounted state or a non-vehicle-mounted state, and changes the display form of the map image displayed according to the determination result Like to do.
[0033]
FIG. 5 is a diagram showing a display example in the map display device 1 of the present embodiment. FIG. 5A shows a display example when the vehicle is mounted, and FIG. 5B shows a display example when the vehicle is not mounted. Are shown respectively.
As shown in FIG. 5 (a), when the map display device 1 of the present embodiment is mounted on an automobile or the like and a map image is displayed during traveling, the traveling direction of the own vehicle is always on the screen. So-called heading-up display is displayed.
[0034]
On the other hand, when the map display device 1 according to the present embodiment is used on a desk in a general household, for example, if used in Japan, the north direction is always displayed on the screen as shown in FIG. The so-called north-up display is displayed so as to face upward.
[0035]
That is, the map display apparatus 1 of this Embodiment changes the display form of the map image displayed according to whether the use is a vehicle-mounted state. A method for determining whether or not the vehicle is in a vehicle will be described later.
[0036]
In the example shown in FIG. 5 described above, the map display device 1 according to the present embodiment is exemplified as a case where the map image is displayed as heading-up display or north-up display depending on whether or not the vehicle is in an on-vehicle state. As described above, there are other possible map image display methods.
[0037]
1. Map display position at start-up When it is determined that the map display device 1 is in a vehicle-mounted state when the map display device 1 is started, for example, the display position (latitude and longitude) of the map image to be displayed is set as the own vehicle position (current position).
On the other hand, when it is determined that the map display apparatus 1 is not in the on-vehicle state when the map display device 1 is activated, the display position of the map image is set as a position set in advance by the user, for example, the user's residence position.
Various setting methods such as the display position of the map image in the non-vehicle-mounted state, that is, the user's residence position are conceivable. For example, the user inputs and sets the postal code or telephone number (city code) of the residence position. It is possible.
[0038]
2. Map display color When the map display device 1 determines that the vehicle is used in an on-vehicle state, the display color of the map image is set so that the user who is driving the vehicle can safely and easily determine necessary information. . For example, because the outside brightness changes inside the car (day and night, tunnels, etc.), a system that changes the display color of the map according to the outside brightness is provided. The display color is set to be variable according to the external brightness.
On the other hand, when the map display device 1 is used at home, it is expected that the user will gaze at the map image unlike the above-described use in the vehicle. In addition, set the display color of the display image. For example, a color scheme that is easy on the eyes or a color scheme that matches the user's preference.
[0039]
3. When the map display character map display device 1 determines that it is used in an in-vehicle state, the character information amount of the displayed map image is limited to the minimum information amount necessary for driving and displayed. As a result, the time for the user to watch the screen during driving is made as short as possible so that safe driving can be performed.
On the other hand, since the user can watch the screen when using it at home, the amount of character information displayed on the screen is increased within a range that does not become complicated.
Thus, it is possible to display so that the user can obtain as much information as possible from the map screen. In this case, an adjustment function for adjusting the amount of character information displayed on the screen by the user may be provided.
[0040]
4). Viewpoint position at the time of bird's-eye view display When the map display device 1 is used in a vehicle-mounted state, the viewpoint position at the time of displaying a map image by the bird's-eye view display is set to the same viewpoint position as the driver, so that the actual scenery The map is displayed in a form close to.
On the other hand, when used in the home, the viewpoint position of the bird's eye view display is set to a higher viewpoint position than that in the above-described use in the vehicle. Thereby, the readability of the map is enhanced, and the visibility is improved. In this case, a function for adjusting the viewpoint position of the user may be provided.
[0041]
Thus, the map display device 1 of the present embodiment determines whether the place of use is in a vehicle such as an automobile, and according to the determination result, displays the orientation of the map, the initial display position at startup, The map image is displayed in a changed display form such as display color, display character, viewpoint position at the time of bird's-eye view display.
[0042]
Therefore, when the map display device 1 of the present embodiment is used in an automobile, the display can be improved so that the visibility of the screen can be improved and the driver can safely engage in the operation of the car. The display according to the form can be realized.
In addition, for example, when used on a desk in a home, it is possible to realize display of a map image in an unrestricted display or a display form suitable for a home environment.
[0043]
FIG. 6 is a flowchart showing processing executed by the CPU 22 in order for the map display device 1 of the present embodiment to realize the operation as described above.
In this case, in step S101, the CPU 22 determines whether or not the map display device 1 is used in an in-vehicle state.
If a positive result is obtained in step S101, the process proceeds to step S102, and a map image corresponding to use in the in-vehicle state is displayed. In other words, display control is performed so that the display direction of the map image to be displayed, the display position at the time of start-up, the display color, the display character amount, the viewpoint position of the bird's-eye view display, etc. are displayed in the display form adapted to the above-described on-vehicle use. To be executed.
[0044]
On the other hand, when a negative result is obtained in step S101, the process proceeds to step S103, and a map image corresponding to use in a non-vehicle-mounted state is displayed. In other words, the display direction of the map image, the display position at start-up, display color, display character amount, viewpoint position at the time of bird's-eye view display, etc. are displayed in a display form suitable for use on a non-vehicle environment, i.e., on a home desk. Display control is executed.
Thereby, in the map display apparatus 1 of this Embodiment, a map image can be displayed with the display form according to the use in a vehicle-mounted state or a non-vehicle-mounted state.
[0045]
As can be seen from the description so far, the map display device 1 according to the present embodiment determines whether or not the vehicle is in an in-vehicle state, and changes the display form of the map image according to the determination result. ing.
For this reason, in the map display device 1 of the present embodiment, the in-vehicle / non-in-vehicle determination function unit 52 shown in FIG. 4 determines whether or not the map display device 1 is in the in-vehicle state. . Therefore, a configuration example of the in-vehicle / non-in-vehicle determination function unit 52 will be described.
[0046]
First Configuration Example First, a case will be described in which the in-vehicle / non-in-vehicle determination function unit 52 provided in the map display device 1 of the present embodiment is configured using travel information from the autonomous navigation system device 44.
FIG. 7 is a diagram conceptually showing various sensors attached to a vehicle that can include the map display device of the present embodiment.
As shown in FIG. 7, a transmission 201 of a vehicle 200 to which the map display device 1 of the present embodiment can be attached includes a vehicle speed sensor 45 that outputs a pulse corresponding to the speed of the vehicle as an autonomous navigation system device 44. It has been.
The vehicle 200 also includes an acceleration sensor 46a that detects acceleration in the traveling direction (X direction) and an acceleration sensor 46b that detects acceleration in the direction (Y direction) orthogonal to the traveling direction (X direction). .
[0047]
In the map display device 1 according to the present embodiment, the current position of the host vehicle is obtained based on the travel information from the vehicle speed sensor 45 and the acceleration sensor 46 and the GPS data from the GPS 41. In the map display device 1 according to the present embodiment, it is determined whether or not the map display device 1 is in a vehicle-mounted state by using travel information from the vehicle speed sensor 45 and the acceleration sensor 46.
[0048]
FIG. 8 is a block diagram showing a configuration of a vehicle speed data output circuit that outputs vehicle speed data based on the vehicle speed pulse of the vehicle speed sensor 45.
As shown in FIG. 8, the vehicle speed pulse from the vehicle speed sensor 45 is input to the period measuring unit 62 after unnecessary signal components such as noise are removed by a low-pass filter (LPF) 61.
The period measurement unit 62 measures the pulse period of the vehicle speed pulse input via the LPF 61 and outputs the measured pulse period to the calculator 63.
The calculator 63 calculates the speed of the vehicle 200 by performing the following calculation (Equation 1), and outputs the result as vehicle speed data.
Speed (m / s) = 1 / pulse period (s) x distance traveled per pulse (m) (1)
However, ("Moving distance per pulse" is a constant)
[0049]
The “movement distance per pulse” is assumed to be stored in the memory 64 as a value obtained in advance by other means.
[0050]
And in the map display apparatus 1 of this Embodiment, it is judged from the vehicle speed data output from the above vehicle speed data output circuits whether the said map display apparatus 1 is a vehicle-mounted state.
Whether the map display device 1 is in a vehicle-mounted state is determined by the CPU 22 and the determination unit 32 shown in FIG.
For example, when the map display device 1 is not in a vehicle-mounted state, vehicle speed data from the vehicle speed data output circuit as described above is not input to the CPU 22 or the determination unit 32. At the time of detection, it can be determined that the map display device 1 is in a vehicle-mounted state.
[0051]
The vehicle speed data output circuit shown in FIG. 8 is provided either in the map display device 1 or in the vehicle 200.
For example, when the vehicle speed data output circuit is provided inside the map display device 1, the LPF 61, the cycle measuring unit 62, and the calculating unit 63 are configured using the determining unit 32 or the CPU 22 shown in FIG. Can be considered. The memory 64 may be configured using the RAM 24.
[0052]
FIG. 9 is a block diagram showing a configuration of a motion data output circuit that outputs motion data based on the acceleration signal of the acceleration sensor.
In the acceleration sensor 46 (46a, 46b) shown in FIG. 9, the detected accelerations in the axial directions (X axis and Y axis) are converted into voltage signals and output as acceleration signals (X, Y).
Such an acceleration signal (X, Y) is input to an A / D converter 72 after unnecessary signal components such as noise are removed by a low-pass filter (LPF) 71.
The A / D converter 72 converts the input analog acceleration signal (X, Y) into a digital acceleration signal and outputs it to the computing unit 73.
The computing unit 73 performs required computation processing to obtain motion detection data. Here, as the arithmetic processing in the calculator 73, for example, the vibration intensity per unit time is obtained from the input digital acceleration signal, and the vibration intensity is compared with a predetermined threshold value and output as motion detection data. I am doing so.
[0053]
As a method for obtaining the vibration intensity from the acceleration signal, for example, the sensor output of the acceleration sensor 46 during traveling changes momentarily as shown by the curve shown in FIG. Therefore, for example, the vibration intensity can be quantitatively obtained by calculating the area indicated by the oblique line with the change in the sensor output per unit time.
In this way, it is possible to determine whether the vehicle 200 is stationary or traveling from the acceleration signal. If a plurality of threshold values are set, a rough speed can be obtained from the acceleration information. The threshold value is stored in the memory 74 in advance.
[0054]
Therefore, in the map display device 1, the determination unit 32 and / or the CPU 22 can determine whether or not the map display device 1 is in an in-vehicle state based on the motion detection data output from the motion detection data output circuit. it can.
For example, when the map display device 1 is not in a vehicle-mounted state, the motion detection data as described above is not input to the CPU 22 or the determination unit 32, and therefore when the motion detection data is detected by the CPU 22 or the determination unit 32. Therefore, it can be determined that the map display device 1 is in a vehicle-mounted state.
[0055]
The motion data output circuit shown in FIG. 9 is also provided in either the map display device 1 or the vehicle 200. For example, when the motion data output circuit is provided in the map display device 1, the LPF 71 and the A / D converter 72 are configured using the determination unit 32 shown in FIG. It is possible to configure using The memory 74 may be configured using the RAM 24.
[0056]
Second Configuration Example Next, a case where the in-vehicle / non-in-vehicle determination function unit 52 provided in the map display device 1 of the present embodiment is configured using an audio signal from the microphone 43 will be described.
FIG. 11 is a block diagram showing a configuration of a motion data output circuit for obtaining vehicle motion detection data from a microphone sound collection signal.
The microphone 43 shown in FIG. 11 collects noise during traveling of the vehicle 200.
The collected signal collected by the microphone 43 is amplified by the microphone amplifier 81 and then output to the A / D converter 83 with a band limited by a low-pass filter (LPF) 82 so that aliasing does not occur. .
After being converted into a digital signal by the A / D converter 83, it is supplied to the computing unit 84.
[0057]
The computing unit 84 performs necessary computation processing on the input digital signal and outputs motion detection data.
As the arithmetic processing in the arithmetic unit 84, for example, after the collected sound signal converted into a digital signal is further converted into a frequency component and a sound pressure level, the required arithmetic processing is performed for analysis. In this case, the frequency component can be obtained by combining FFT and a plurality of digital filters.
[0058]
Usually, the main component of the noise that changes according to the traveling speed is road noise caused by friction between the tire and the road.
The frequency component and magnitude of road noise vary depending on the road surface condition and the type of tire. For example, by providing a learning function, it is possible to determine whether the vehicle is stationary or running. .
In addition, assuming a situation where there is no sudden start or sudden stop in a normal driving state, road noise during acceleration / deceleration changes gently.
Therefore, by learning this noise component, it is possible to discriminate to some extent the component that changes according to the disturbance and the speed of the vehicle.
[0059]
Therefore, in the map display device 1, the determination unit 32 and / or the CPU 22 determines whether or not the map display device 1 is in an in-vehicle state based on the motion detection data from the motion detection data output circuit shown in FIG. be able to.
[0060]
It should be noted that such a judgment method using sound such as noise is likely to be affected by disturbances and causes a judgment error, but the installation position is devised so that road noise can be efficiently picked up by the microphone 43. By doing so, it is possible to reduce the error rate.
[0061]
The motion data output circuit shown in FIG. 11 is also provided in either the map display device 1 or the vehicle 200 as described above.
For example, when the motion data output circuit is provided inside the map display device 1, the amplifier 81, the LPF 82, and the A / D converter 83 are configured using the determination unit 32 shown in FIG. Is configured using the CPU 22. The memory 85 may be configured using the RAM 24.
[0062]
Third Configuration Example Next, a case where the in-vehicle / non-in-vehicle determination function unit 52 provided in the map display device 1 of the present embodiment is configured using a detection signal of a noise sensor will be described.
FIG. 12 is a diagram conceptually showing the configuration of a vehicle power supply system line to which the map display device of the present embodiment can be applied.
[0063]
The power supply line of the vehicle 200 shown in FIG. 12 includes a battery 202 and an alternator 203. In FIG. 12, the alternator 203, which is an AC generator, and the battery 202 are shown as being directly connected to each other, but this is merely a conceptual illustration of the relationship between the alternator 203 and the battery 202. Actually, the alternator 203 and the battery 202 are not directly connected.
[0064]
In such a power supply line of the vehicle 200, even if appropriate measures are taken, the AC component of the alternator 203 slightly leaks into the vehicle power supply line 204. For this reason, for example, when an audio device or the like for which countermeasures against alternator noise are insufficient is driven by the battery 202 that is an in-vehicle power source, noise may be included in the output of the audio device, and one of the causes is this alternator noise. is there.
[0065]
Therefore, in the map display device 1 of the present embodiment, if this alternator noise can be detected, it can be determined whether the map display device 1 is driven by the battery 202 mounted on the vehicle 200. That is, it can be determined whether or not the vehicle is in a vehicle-mounted state.
[0066]
FIG. 13 is a block diagram showing the configuration of the alternator noise detection circuit.
In FIG. 13, the power supply voltage Vc from the vehicle 200 is cut out of the direct current voltage component by the direct current (DC) cut circuit 91 and only the alternating voltage component is extracted.
The AC voltage component extracted in the DC cut circuit 91 is amplified to a level that can be sufficiently detected by an amplifier (amplifier) 92, and then an unnecessary low frequency component is removed by a low-pass filter (LPF) 93, and then A / D The converter 94 converts the digital signal.
The arithmetic unit 95 performs frequency analysis of the AC component digitally converted by the A / D converter 94 and determines whether or not the AC component is an alternator noise component.
[0067]
The alternator noise has a feature that the peak frequency changes according to the engine speed, and when the alternator rotates, a waveform in which noise is superimposed on the center voltage Vc of the battery 202 as shown in FIG. It becomes.
Therefore, in the map display device 1 of the present embodiment, the computing unit 95 determines whether or not it is alternator noise, and outputs the determination result as power supply noise determination data.
[0068]
In addition, if an alternator noise detection circuit is provided with a function to learn the typical spectrum of the noise component during rotation and non-rotation of the alternator, the presence or absence of alternator noise can be detected even when there is no change in engine rotation. Is possible. The learning data is stored in the memory 96.
[0069]
Therefore, also in the map display device 1 of the present embodiment, it is possible to determine whether or not the map display device 1 is in a vehicle-mounted state based on the power supply noise determination data output from the calculator 95. The
[0070]
Such an alternator noise detection circuit is provided inside the map display device 1. For example, the above-described DC cut circuit 91, amplifier 92, LPF 93, and A / D converter 94 are shown in FIG. The noise sensor 30 may be formed, and the arithmetic unit 95 may be configured by using the CPU 22 and the memory 96 by using the RAM 24.
[0071]
Fourth Configuration Example Next, a case where the in-vehicle / non-in-vehicle determination function unit 52 provided in the map display device 1 of the present embodiment is configured using the power supply voltage of the battery provided in the vehicle 200 will be described. explain.
The battery 202 mounted on the vehicle 200 has a low power supply voltage because a large current flows when the cell motor is rotated when the engine is started.
Therefore, in the map display device 1, it is possible to determine whether the map display device 1 is driven by the battery 202, that is, whether it is in an in-vehicle state, by detecting a voltage drop when the cell motor is ON. Is done.
[0072]
FIG. 15 is a block diagram showing a configuration of a voltage drop detection circuit that detects a voltage drop when the cell motor is on. Such a voltage drop detection circuit is formed in the determination unit 32 in the map display device 1.
[0073]
The voltage drop detection circuit shown in FIG. 15 includes comparators 101 and 102 and an AND circuit 103. The non-inverting input terminal (+) of the comparator 101 and the inverting input terminal (−) of the comparator 102 are connected to the vehicle 200. Battery voltage is applied. A predetermined reference voltage Vt2 is applied to the inverting input terminal (−) of the comparator 101, and a reference voltage Vt1 having a predetermined level higher than the reference voltage Vt2 is applied to the non-inverting input terminal (+) of the comparator 102. ing. The outputs of the comparators 101 and 102 are output via an AND circuit 103.
If comprised in this way, in the map display apparatus 1 of this Embodiment, with the large current which flows at the time of engine starting, as FIG. 16 shows, the power supply voltage Vc at the time of normal of the battery 202 will fall to the voltage Vl. Since the voltage change of the power supply voltage Vc to be detected can be detected, it can be determined whether or not the map display device 1 is in a vehicle-mounted state.
[0074]
Fifth Configuration Example Next, a case where the in-vehicle / non-in-vehicle determination function unit 52 provided in the map display device 1 of the present embodiment is configured using an in-vehicle cradle will be described.
FIG. 17 is a diagram showing the relationship between the map display device of this embodiment and the in-vehicle cradle.
As shown in FIG. 17, the map display device 1 of the present embodiment can be installed on an in-vehicle cradle 4 provided in the vehicle.
When installed in the vehicle-mounted cradle 4, a power supply voltage is supplied from a battery 202 mounted on the vehicle 200 through a path from the power contact 13 of the vehicle-mounted cradle 4 to the power contact 10 of the map display device 1. Various input signals from the GPS 42 and the autonomous navigation system device 44 provided in the vehicle 200 are supplied via the communication contact 14 of the in-vehicle cradle 4 and the communication contact 11 of the map display device 1.
[0075]
Furthermore, in the present embodiment, the internal circuit switch 12 is provided as the cradle detection unit 31 in the map display device 1 as a determination mechanism for determining whether or not the map display device 1 is installed in the in-vehicle cradle 4. . Further, the in-vehicle cradle 4 is formed with a protrusion 15 at a position corresponding to the internal circuit switch 12 of the map display device 1.
[0076]
FIG. 18 is an explanatory diagram of a discrimination mechanism formed in the map display device 1 and the in-vehicle cradle 4 described above.
As shown in FIG. 18 (a), the projection 15 does not come into contact with the internal circuit switch 12 when the map display device 1 is not installed on the in-vehicle cradle 4. Turned on.
On the other hand, when the map display device 1 is installed on the in-vehicle cradle 4, the projection 15 of the in-vehicle cradle 4 contacts the internal circuit switch 12 of the map display device 1 as shown in FIG. The circuit switch 12 is turned off.
Therefore, the map display device 1 can determine whether the internal circuit switch 12 is in the on-vehicle state from the on / off state.
[0077]
FIG. 19 is a flowchart showing a processing operation for determining whether or not the map display device is in a vehicle-mounted state by the determination mechanism as described above. Such processing operation is executed by the CPU 22 of the map display device 1 shown in FIG.
In this case, when the CPU 22 determines in step S201 that the system power supply (standby power supply) of the map display device 1 has been turned on, the CPU 22 proceeds to step S202 and determines whether or not the state of the internal circuit switch 12 is off. It is made to discriminate. In step S202, when a positive result is obtained, the process proceeds to step S203, and it is determined that the map display device 1 is in a vehicle-mounted state.
On the other hand, when a negative result is obtained in step S202, the process proceeds to step S204, and it is determined that the map display device 1 is not in an on-vehicle state.
If it does in this way, it can be discriminate | determined whether the map display apparatus 1 of this Embodiment is installed in the vehicle-mounted cradle 4. FIG.
[0078]
In the present embodiment, a physical determination mechanism is provided as the cradle detection unit 31 for determining whether or not the map display device 1 is installed in the in-vehicle cradle 4, but this is only an example. For example, communication between the map display device 1 and the vehicle-mounted cradle 4 or between the map display device 1 and a vehicle control bus represented by CAN-BUS is performed to confirm whether or not the vehicle is in a vehicle-mounted state. You may do it.
[0079]
Sixth Configuration Example Next, a case where the in-vehicle / non-in-vehicle determination function unit 52 provided in the map display device 1 of the present embodiment is configured using the input unit 21 will be described.
In this case, based on the input operation information input from the input unit 21 that functions as the user input function unit 51, it is determined whether or not the vehicle is in a vehicle-mounted state.
For example, it is conceivable that the map display device 1 is provided with a GUI function, and a GUI screen as shown in FIG. 20 is displayed on the display unit 2 to prompt the user to input the current usage state. Of course, it is needless to say that the input unit 21 that functions as the user input function unit 51 can be used by using, for example, a mouse or a remote controller.
[0080]
In this way, if the in-vehicle / non-in-vehicle determination function unit 52 of the map display device 1 according to the present embodiment is configured, it can be determined whether or not the map display device 1 is in an in-vehicle state. A map image according to the environment can be displayed.
For example, when the map display device 1 is used in a vehicle such as an automobile, the map orientation display, initial display position at startup, display color, display characters, viewpoint position at the time of bird's eye view display, etc. are used in the vehicle. It can be displayed as a map image suitable for.
Also, if you are at home, display the orientation of the display map, the initial display position at startup, display color, display characters, viewpoint position at the time of bird's eye view display, etc. as a map image suitable for use at home Can do.
[0081]
In addition, in-vehicle visual devices represented by conventional car navigation systems often have to be connected to the electrical system of the car, and it is necessary to request installation from a specialized supplier. It was one of the obstacles.
On the other hand, in the case of an in-vehicle device that obtains power using the cigar power connector 5 as in the present embodiment, the hurdle for mounting can be lowered, but it is necessary for switching the safety mode. There were problems such as inability to obtain signals and sufficient safety measures.
However, as in the present embodiment, the map display device 1 can be configured to change the display form of the map image depending on whether or not it is in an in-vehicle state. The map image of can be displayed. Furthermore, since it is possible to determine whether or not the vehicle 200 on which the map display device 1 is mounted is in a running state based on input information from the in-vehicle / non-in-vehicle determination function unit 52, the cigar power connector as shown in FIG. Even when the power source is obtained from 5, there is an advantage that the above-described problems do not occur.
[0082]
In the present embodiment, it is determined whether or not the map display device 1 is in a vehicle-mounted state or a non-vehicle-mounted state by determining whether or not the map display device 1 is in a vehicle-mounted state. However, this is merely an example. For example, by determining whether or not the map display device 1 is in a non-vehicle-mounted state, the map display device 1 is used in a vehicle-mounted state or in a non-vehicle-mounted state. It is also possible to determine whether it is used.
[0083]
【The invention's effect】
As described above, according to the present invention, the state determination unit determines whether the map display device is in the in-vehicle state or the non-in-vehicle state, and depending on the determination result, the display control unit Display control is performed so that a map image is displayed. Thereby, the optimal map display according to use environment is realizable. For example, when the map display device is used in a vehicle such as an automobile, a map image suitable for use in the vehicle can be displayed. The map image suitable for use in the can be displayed. As a result, when the map display device of the present invention is used in a vehicle such as an automobile, the visibility of the screen can be improved, and the driver can safely engage in the operation of the vehicle. The display by can be realized.
Further, when used on a desk in the home, the display of the map image can be realized in an unrestricted display or a display form suitable for the environment in the home.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic structure of a map display device according to an embodiment of the present invention.
FIG. 2 is a diagram showing an example of how the map display device of the present embodiment is used.
FIG. 3 is a block diagram showing a hardware configuration of the map display device of the present embodiment.
FIG. 4 is a functional block diagram of the map display device of the present embodiment.
FIG. 5 is a diagram showing a display example in the map display device of the present embodiment.
FIG. 6 is a flowchart showing processing executed by the map display device of the present embodiment.
FIG. 7 is a diagram conceptually showing a sensor attached to a vehicle.
FIG. 8 is a block diagram showing a configuration of a vehicle speed data output circuit that outputs vehicle speed data based on a vehicle speed pulse of a vehicle speed sensor.
FIG. 9 is a block diagram showing a configuration of a motion data output circuit that outputs motion data based on an acceleration signal of an acceleration sensor.
FIG. 10 is a graph showing an output waveform of the acceleration sensor.
FIG. 11 is a block diagram showing a configuration of a motion data output circuit for obtaining vehicle motion detection data from a microphone sound collection signal.
FIG. 12 is a diagram conceptually showing the configuration of a power supply line of a vehicle.
FIG. 13 is a block diagram showing a configuration of an alternator noise detection circuit.
FIG. 14 is a diagram showing an example of noise in a vehicle power supply system.
FIG. 15 is a block diagram showing a configuration of a voltage drop detection circuit for detecting a voltage drop.
FIG. 16 is a diagram showing a state of voltage transition of the vehicle power supply system.
FIG. 17 is a conceptual diagram showing the relationship between the map display device of this embodiment and the in-vehicle cradle.
FIG. 18 is an explanatory diagram of a discrimination mechanism formed in the map display device and the in-vehicle cradle according to the present embodiment.
FIG. 19 is a flowchart showing a processing operation for determining whether or not the map display device is in a vehicle-mounted state.
FIG. 20 is an explanatory diagram illustrating an operation for determining whether or not the vehicle is in a vehicle-mounted state by a user input operation.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Map display apparatus, 2 Display part, 3 Operation part, 4 Car cradle, 5 Cigar power connector, 6 Power cable, 7 Signal cable, 8 Commercial power supply, 9 AC / DC converter, 1013 Power supply contact, 1114 Communication contact , 12 switch, 15 projection, 21 input unit, 22 CPU, 23 ROM, 24 RAM, 25 disk drive, 26 VRAM, 27 display driver, 28 recording medium, 29 interface, 30 noise sensor, 31 cradle detection unit, 32 determination unit , 33 bus, 41 antenna, 42 GPS, 43 microphone, 44 autonomous navigation system device, 45 vehicle speed sensor, 46 acceleration sensor, 47 gyro, 51 user input function unit, 52 in-vehicle / non-in-vehicle determination function unit, 53 processing function unit, 54 input information processing unit, 55 map information processing unit, 56 screen drawing processing unit, 5 Map information storage function unit, 58 image output function unit, 61 71 82 93 low-pass filter, 62 period measurement unit, 63 73 84 95 computing unit, 6474 96 memory, 72 83 94 A / D converter, 81 microphone amplifier, 91 DC Cut circuit, 101 102 Comparator, 103 AND circuit

Claims (1)

State discriminating means for discriminating whether it is in-vehicle state or non-in-vehicle state;
According to the determination result of the state determination means ,
When the determination result is in-vehicle use, map display is performed with the viewpoint position when the map image is displayed by bird's eye view display as the viewpoint position similar to the driver,
When the discrimination result is use in a non-vehicle state, a map display is performed with the viewpoint position of the bird's eye view display as a viewpoint position higher than the use in the vehicle state.
Display control means for changing and displaying the viewpoint position of the bird's eye view image to be displayed ,
Map display device Ru equipped with.

Images