JP2004101280A - Car navigation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the content of a displayed screen from turning to the content being far from an operator' sensory immersion, in a car navigation system wherein a screen of content relative to decelerating magnitude during deceleration is displayed on a display means. <P>SOLUTION: Each time when brakes are applied to a vehicle, deceleration at that time is detected, and speed change is detected until the vehicle stops. The speed change is patterned as damping characteristic. When the brake is applied to the vehicle, deceleration at the time of starting deceleration is detected, and regular deceleration or slam on the brake is decided. Application to the patterned damping characteristic is performed, Whether it is the slam on the brake is decided, and display is performed corresponding to decision result. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a car navigation device that performs display according to the speed of a vehicle when the speed changes.
[0002]
[Prior art]
The car navigation device detects the current position of the vehicle using a GPS (Global Positioning System) and displays map data centered on the current position on a screen of a display device. When a destination is set, a guide route from the current position to the destination is calculated, and the guide route is displayed on a map displayed on the screen in a color different from a normal road to reach the destination. The running of the car can be done smoothly.
In such a car navigation device, in recent years, when a driver detects a dangerous driving, as shown in, for example, Japanese Patent Application Laid-Open No. 2001-195675, a display image is displayed on the display device so as to disturb the dangerous driving. There are things that I try to do.
[0003]
[Problems to be solved by the invention]
Japanese Patent Application Laid-Open No. 2001-195675 described above detects acceleration by, for example, acceleration detection means, compares the acceleration with a predetermined absolute value, detects sudden start / rapid acceleration, or sudden brake, and makes a display corresponding thereto. That is.
[0004]
However, whether or not the driving is dangerous depends on the individual senses and skills of the driver. For this reason, in a configuration in which the acceleration / deceleration of the vehicle is compared with a predetermined value to determine whether the vehicle is abruptly started, rapidly accelerated, or suddenly braked, the sense of discomfort may be different from the actual driver's feeling. There was a case.
[0005]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a car navigation device in which a screen having a content corresponding to the size thereof is displayed on a display unit at the time of acceleration or deceleration. It is an object of the present invention to provide a car navigation device that can prevent the content from being out of the driver's sense as much as possible.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 includes a driving information obtaining unit that detects a speed or an acceleration / deceleration of a vehicle, and a driving characteristic obtaining unit that obtains a driving characteristic based on a detection value of the driving information obtaining unit. Means, the control means, when a speed change occurs in the vehicle, based on the detected value of the traveling information acquisition means and the driving characteristics acquired by the driving characteristics acquisition means, the display means according to the speed or acceleration / deceleration Display is performed.
According to this means, when the speed of the vehicle changes, the speed or excessive deceleration at that time is displayed in comparison with the driving characteristics at the time of the driver's normal start or braking, so that the display contents are displayed. This can be in accordance with the driver's feeling.
[0007]
According to the second aspect of the invention, at the time of deceleration of the vehicle, a braking characteristic based on a speed change from the start to the stop of deceleration is acquired as a driving characteristic, and at the time of deceleration of the vehicle, the deceleration and the braking characteristic at that time are obtained. A display relating to braking is performed on the basis of this.
If all the speed changes are displayed, the map data displayed on the display means may be difficult to see, or the map data may be erased. However, dangerous driving is often performed during braking rather than at the time of starting. Therefore, if the braking time is displayed as in the means of claim 2, the display of the map data is obstructed, and there is an opportunity for the opportunity. Less.
[0008]
In this case, if the display on the display means at the time of deceleration of the vehicle includes the predicted distance to the stop, the relationship between the degree of depression of the brake pedal and the braking distance is learned. be able to.
Furthermore, if the actual traveling distance of the vehicle up to the stop is displayed together with the predicted braking distance at the time of deceleration of the vehicle, it is possible to learn whether or not the brake pedal is properly depressed. can do.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing the overall configuration of the car navigation device 1. As shown in FIG. 1, a car navigation device 1 includes a control circuit 2 as control means, a position detection device 3 as position detection means, a map data storage device 4 as map data storage means, an operation switch group 5, a display means. And a remote controller 10 paired with the remote controller 9 and a speed sensor 11 as travel information acquisition means.
[0010]
The control circuit 2 has a function of controlling the overall operation of the car navigation device 1, and is mainly configured by a microcomputer. That is, the control circuit 2 is configured to include a CPU, a ROM, a RAM, an I / O, a bus connecting these, and the like (all not shown). Of these, an execution program for operating the car navigation device 1 is stored in the ROM, and temporary data at the time of executing the program, map data acquired from the map data storage device 4, and the like are temporarily stored in the RAM. It has become.
[0011]
The position detecting device 3 includes a geomagnetic sensor 12, a gyroscope 13, a distance sensor 14, a GPS (Global Positioning System) receiver 15, an acceleration sensor 16 as running information acquisition means, and the like. Among these sensors 12 to 16, the distance sensor 14 detects the traveling distance of the vehicle, and determines the traveling distance of the vehicle from the pulse output from the rotation sensor for detecting the rotation of the axle and the tire diameter. I have.
[0012]
In addition, the acceleration sensor 16 has, for example, a weight portion provided at the center of a vertically disposed thin film, and when acceleration and deceleration act on the vehicle, the amount of flexure of the thin film is detected by a strain sensor to thereby increase the acceleration and vehicle speed of the vehicle. This is a configuration for detecting deceleration. The acceleration sensor 16 is also used for detecting the inclination of the vehicle.
[0013]
Since these sensors 12 to 16 have detection errors having different properties, by combining these sensors 12 to 16, it is possible to perform highly accurate position detection while correcting the detection errors. Note that depending on the required detection accuracy level, it is not necessary to provide all the sensors 12 to 16, and a configuration may be adopted in which the sensors are appropriately selected and provided.
[0014]
A pulse from a rotation sensor for detecting the rotation of the axle is input to the speed sensor 11, and the speed sensor 11 determines the vehicle speed from the input pulse number per unit time and the tire diameter. . The map data storage device 4 includes an information recording medium such as a DVD-ROM and a reading device that reads data from the information recording medium. The reading device reads data from the information recording medium and sends the data to the control circuit 2. input.
[0015]
The display device 6 includes a liquid crystal display as a display screen for map data, characters, symbols, or graphics, and the operation switch group 5 includes, for example, pushbutton switches provided around the liquid crystal display. ing.
[0016]
The control circuit 2 has a function as a display control means, calculates the current position of the vehicle based on information input from the position detection device 3, and displays a road map around the current position based on the map data. 6 and a pointer indicating the current position and the traveling direction of the car is displayed on the displayed road map. The scale of the road map displayed on this display screen can be changed by operating the operation switches 5.
[0017]
The control circuit 2 has a function of setting a route to a destination and a traveling guide function of instructing a direction in which the vehicle should travel in accordance with the route with a voice output from the voice output device 7. That is, when a destination or a passing point is set by operating the operation switch group 5 or the remote controller 10, an optimal route from the current position to the destination is automatically set as a guide route, and the guide route is displayed on the liquid crystal of the display device 6. The road map is displayed in a different color from the normal road color on the road map displayed on the display. Then, the control circuit 2 guides the traveling direction of the vehicle by voice or the like according to the guide route. Note that the Dijkstra method or the like is used as a method for setting the optimum route.
[0018]
By the way, in this embodiment, the car navigation device 1 performs a display according to the acceleration at the time of acceleration. Further, the car navigation device 1 learns the braking characteristics at the time of deceleration, and performs display according to the deceleration while referring to the learned braking characteristics when the braking is applied.
[0019]
Hereinafter, the contents of the learning and the contents of the display operation at the time of acceleration / deceleration will be described with reference to FIGS. When the control circuit 2 enters the learning routine shown in FIG. 2, it first determines whether or not the vehicle is running based on the output value of the speed sensor 11 (step S1). .
[0020]
If the vehicle is traveling ("YES" in step S1), the control circuit 2 next detects the speed from the output value of the speed sensor 11 (step S2), and after a lapse of a predetermined time, detects the speed again (step S2). "YES" in step S3, step S4). Then, it is determined whether or not the vehicle is decelerated from the previous detected speed and the present detected speed (step S5).
[0021]
If it is not deceleration ("NO" in step S5), the control circuit 2 repeatedly executes steps S2 to S5. In the case of deceleration ("YES" in step S5), the control circuit 2 stores the speed at the start of deceleration detected in step S2 (step S6), and subsequently detects the deceleration from the detected value of the acceleration sensor 16, and Is stored (step S7). Thereafter, the control circuit 2 detects and stores the speed at fixed time intervals, and continues the operation of comparing the current detected speed with the previous detected speed to determine whether or not deceleration is continued until the vehicle stops. (Such as "YES" in step S8, "NO" in step S9 and step S10, and "YES" in step S11). When the vehicle stops ("YES" in step S11), the control circuit 2 stores the speed change from the start of deceleration to the stop as a braking characteristic (driving characteristic) as shown in FIG. 4 (step S12), and learns. End the routine.
[0022]
Here, the time from when the brake is applied to when it stops is different depending on the speed at which the brake is applied. In the braking characteristics shown in FIG. 4, the speed on the vertical axis and the time axis on the horizontal axis always have a fixed length. V and T are used as patterns of speed change. In this case, the braking characteristics may be created for each of the high speed, the medium speed, and the low speed depending on the speed at the start of the braking.
[0023]
During the operation of detecting the speed at the above-mentioned fixed time and comparing with the detected speed this time to determine whether deceleration is continuing, there is a time when the brake is released and the speed becomes constant or the speed is accelerated When the control circuit 2 has occurred, the control circuit 2 turns to "YES" in step S10 and shifts to step S13. Here, the control circuit 2 deletes the speed stored every fixed time from the start of deceleration, and executes the learning routine. To end.
As described above, each time the brake is applied during the running of the vehicle and the vehicle stops, the current braking characteristic is weighted with the current braking characteristic and rewritten to a new braking characteristic.
[0024]
On the other hand, when the vehicle is accelerated or decelerated, a display screen corresponding to the acceleration is displayed on the display device 6. FIG. 3 shows the control contents for this display. When the control enters the display routine shown in FIG. 3, the control circuit 2 first determines from the output value of the speed sensor 11 whether or not the vehicle is running ( Step A1) If the vehicle is not running, the process exits the display routine.
[0025]
If the vehicle is traveling ("YES" in step A1), the control circuit 2 determines whether or not the vehicle is accelerating based on the output value of the acceleration sensor 16 (step A2). (“YES” in step A2), for example, as shown in FIG. 5, the acceleration is displayed in G at one corner of the display of the display device 6, and as can be understood from the comparison of FIGS. On the lower side (rear side) of the pointer P indicating the own vehicle position, the distance between the roads is displayed wider than the actual distance. In this case, the distance between the roads below the pointer P is made larger in accordance with the output value of the acceleration sensor 16, that is, the larger the acceleration, the larger the distance between the actual roads. And return. The driver can intuitively know the magnitude of the acceleration by looking at this display.
[0026]
As another example of intuitively displaying the magnitude of the acceleration, as shown in FIG. 7, the acceleration is displayed in the same manner as described above, and the lower side (rear side) of the pointer P indicating the own vehicle position. A line (which will be referred to as a flow line) that gradually becomes thicker toward the bottom may be drawn, and the magnitude of the acceleration may be represented by the length of the flow line.
[0027]
In addition, only when the acceleration exceeds a predetermined value, the width of the road is displayed wide, or the flow line is displayed, and the magnitude of the acceleration is intuitively displayed. You may comprise.
[0028]
When the vehicle is running and the brake is applied and the vehicle is decelerated, the control circuit 2 determines "NO" in step A2 and "YES" in step A4, and then outputs the detection outputs of the acceleration sensor 16 and the distance sensor 14. Then, the deceleration and the traveling distance at that time are detected (step A5), and it is determined whether the deceleration is equal to or more than a predetermined value (step A6). If neither acceleration nor deceleration, that is, if the vehicle is traveling at a constant speed, "NO" is determined in the step A4, and the display routine is ended.
[0029]
If it is determined in step A6 that the deceleration is greater than or equal to a predetermined value, for example, the deceleration is large enough to operate an ABS (Antilock Break System), the control circuit 2 makes "YES" in the same step, and in step A7, the display is in danger. Display. This danger display is, for example, as shown in FIG. 9, the characters “danger”, “DANGER”, and “ABS operation” are displayed in three rows on the display. The danger display disappears when the vehicle stops ("YES" in step A10, step A11), and the process returns.
[0030]
If the deceleration is less than the predetermined value ("NO" in step A6), the control circuit 2 determines whether the deceleration exceeds the maximum value of the deceleration stored in step S7 of the learning routine (step S6). A8). If the value is equal to or smaller than the stored deceleration value, the control circuit 2 makes "NO" in step A8, and performs a display corresponding to the deceleration in the next step A9.
[0031]
As shown in FIG. 6, the display in accordance with the deceleration displays the acceleration in G at one corner of the display and the position above the pointer P indicating the position of the host vehicle (in the traveling direction), contrary to the case of the acceleration described above. Side), the distance between the roads is displayed narrower than the actual distance. In this case, the interval between the roads above the pointer P is made narrower according to the output value of the acceleration sensor 16, that is, the greater the deceleration is, the more intuitively the deceleration is displayed. I do.
[0032]
As another example, as shown in FIG. 8, the deceleration is similarly displayed as a numerical value, and a line that gradually becomes thinner toward the upper side (the traveling direction side) of the pointer P indicating the own vehicle position (stopping). It is considered that the length of the stop line is displayed shorter as the deceleration is larger.
Then, the screen on which the acceleration is sensibly displayed is deleted when the vehicle stops (“YES” in step A10, step A15), and the process returns.
[0033]
When the deceleration is larger than the stored deceleration, for example, when a sudden brake is depressed, the control circuit 2 determines "YES" in step A8 and shifts to step A12 where the speed is reduced. To detect. Next, as shown in FIG. 10A, the control circuit 2 displays "sudden braking", "-** G (deceleration)", and "predicted braking distance ** m" on the display of the display device 6. I do.
[0034]
Here, the predicted braking distance is obtained by applying the speed at which the starting point of the braking characteristic curve in FIG. 4 is detected in step A12 and the slope of the line segment near the starting point of the braking characteristic curve to the deceleration detected in step A5, It refers to the braking distance calculated from the braking characteristic curve.
[0035]
When the vehicle stops ("YES" in step A14), control circuit 2 detects the current distance of distance sensor 14 (step A15), and subtracts the distance stored in step A5 from the detected distance. The actual travel distance (actual braking distance) from when the brake is applied to when it stops is calculated, and the difference between the predicted braking distance and the actual braking distance is determined as the subtracted braking distance, as shown in FIG. Then, the predicted braking distance, the actual braking distance, and the subtracted braking distance are displayed on the display (Step A16), and after a lapse of a predetermined time (Step A17), the display is erased ("YES" in Step A18), and a return is made. Become.
[0036]
As described above, according to the present embodiment, at the time of braking, the deceleration at the start of braking is compared with the deceleration stored as the braking characteristic, and a display corresponding to the deceleration, that is, exceeding the normal deceleration of the driver, If so, it is determined that the vehicle is suddenly braked, and a sudden brake is displayed as shown in FIG. 10, and if it is lower than the normal deceleration, a display corresponding to the deceleration as shown in FIG. 6 or FIG. Therefore, the display can be made in accordance with the driver's feeling.
[0037]
It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, and the following extensions or modifications are possible.
The braking characteristic may be one that records the actual speed change.
The braking characteristic may be obtained by patterning a change in deceleration.
The driving characteristics at the time of acceleration may be acquired, and a display adapted to the driver's feeling may be displayed even when the vehicle is accelerated.
The driving characteristics may be obtained by patterning changes in acceleration and deceleration, respectively.
[Brief description of the drawings]
FIG. 1 is a block diagram of a car navigation device showing one embodiment of the present invention. FIG. 2 is a flowchart showing learning contents. FIG. 3 is a flowchart showing deceleration display contents. FIG. 4 is an example of braking characteristics. FIG. 5 shows an example of a display during normal acceleration. FIG. 6 shows another example of a display during normal deceleration. FIG. 7 shows another display example during normal acceleration. FIG. 8 is a diagram showing another display example during normal deceleration. FIG. 9 is a diagram showing a display example in case of dangerous deceleration. FIG. 10 is a diagram showing a display example in case of sudden braking.
2 is a control circuit (control means), 3 is a position detection device, 4 is a map data storage device (map data acquisition means), 6 is a display device (display means), 11 is a speed sensor (running information detection means), 14 is The distance sensor 16 is an acceleration sensor (running information detecting means).

Claims (4)

Position information acquisition means for acquiring position information;
Map data storage means for storing map data;
Display means for displaying map data acquired from the map data storage means on a screen together with position information from the position information acquisition means;
A car navigation device comprising: a control unit that performs overall control of each of the units.
Traveling information acquisition means for detecting the speed or acceleration / deceleration of the vehicle,
A driving characteristic acquisition unit that acquires driving characteristics based on the detection value of the traveling information acquisition unit is provided,
The control means displays a speed or acceleration / deceleration on the display means based on the detected value of the driving information obtaining means and the driving characteristics obtained by the driving characteristics obtaining means when a speed change occurs in the vehicle. Car navigation device characterized by performing. The driving information obtaining unit includes a speed sensor that detects a speed of the vehicle, the driving characteristic obtaining unit obtains a braking characteristic based on a speed change from a deceleration start to a stop as a driving characteristic, and the control unit includes: 2. The car navigation device according to claim 1, wherein a display related to braking is performed based on the deceleration and the braking characteristics when the vehicle decelerates. 3. The car navigation device according to claim 2, wherein the display related to the braking includes at least a predicted braking distance to a stop. The car navigation device according to claim 3, wherein the display relating to the braking includes an actual traveling distance until the stop in addition to the predicted braking distance until the stop.

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