JP2010002384A - Vehicle-mounted display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display acceleration added to a vehicle at a location through which a vehicle will pass in the future and make a driver intuitively understand how displayed acceleration affects the vehicle. <P>SOLUTION: A display pattern generating part generates an arc-shaped display pattern P. The display pattern generating part changes the inclination of the display pattern P to the right and left within the range between 0-90° according to the direction of a lateral G-force and its size with reference to the immediately downward direction of a circle. Since the inclination of the display pattern P is a display reminding the driver of movements of a pendulum swinging due to a centrifugal force by such a display pattern P, the driver can intuitively understand a lateral G-force added to the vehicle. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an in-vehicle display device that displays acceleration applied to a vehicle.

2. Description of the Related Art Conventionally, an in-vehicle display device that displays acceleration applied to a vehicle at a current position on a map screen together with information on acceleration at a past position where the vehicle has already passed is known.
JP 2006-160191 A

  Since the conventional in-vehicle display device displays the acceleration at the current position and the past position where the vehicle has already passed, the acceleration applied to the vehicle cannot be displayed at a point where the vehicle has not yet passed. Further, the driver cannot intuitively understand how the displayed acceleration affects the vehicle.

  The present invention has been made in order to solve such problems, and its purpose is to display the acceleration applied to the vehicle at a point where the vehicle will pass in the future and how the displayed acceleration affects the vehicle. It is an object of the present invention to provide an in-vehicle display device that allows a driver to intuitively understand whether or not the vehicle is affected.

  The in-vehicle display device according to the present invention estimates the turning acceleration applied to the vehicle based on the map information around the own vehicle and the vehicle information of the own vehicle, and visually determines the turning acceleration applied to the vehicle based on the estimated turning acceleration. A display pattern to be displayed is generated, and the generated display pattern is displayed.

  According to the vehicle-mounted display device according to the present invention, the acceleration applied to the vehicle at a point where the vehicle passes in the future is displayed and the driver can intuitively understand how the displayed acceleration affects the vehicle. be able to.

  Hereinafter, a configuration of an in-vehicle display device according to an embodiment of the present invention will be described with reference to the drawings.

[Configuration of in-vehicle display device]
First, the configuration of an in-vehicle display device that is an embodiment of the present invention will be described with reference to FIG.

  An in-vehicle display device according to an embodiment of the present invention is mounted on a vehicle, and as shown in FIG. 1, a map information acquisition unit 2, a vehicle information acquisition unit 3, a calculation unit 4, a display pattern generation unit 5, and a display unit 6 As a main component. The map information acquisition part 2 is comprised by the apparatus which can acquire the information regarding the shape of roads, such as map information, such as a navigation system, for example. In the present embodiment, the map information acquisition unit 2 performs various operations based on the position of the vehicle from the shape of the road on which the vehicle is currently traveling, such as a point where the vehicle is currently traveling or a point 100 m ahead of the current position of the vehicle. The curvature of the point is acquired or calculated and output to the calculation unit 4.

  The vehicle information acquisition unit 3 includes a known sensor attached to the vehicle, acquires vehicle information such as the vehicle speed and turning acceleration (lateral G) applied to the vehicle, and outputs the vehicle information to the calculation unit 4. The calculation unit 4 is configured by a known calculation processing device such as a microcomputer in the navigation system, and based on information input from the map information acquisition unit 2 and the vehicle information acquisition unit 3, a general centrifugal force calculation is performed. Etc., the lateral G applied to the vehicle is estimated. The display pattern generation unit 5 includes a known image processing device, and generates a display pattern that visually indicates the lateral G to be applied to the vehicle from the lateral G calculated by the calculation unit 4. The display unit 6 is configured by a known display device such as a liquid crystal display, and displays the display pattern generated by the display pattern generation unit 5.

  When the vehicle information acquisition unit 2 can detect the lateral G applied to the vehicle, the calculation unit 4 calculates the inclination of the display pattern P using the lateral G detected by the vehicle information acquisition unit 2 instead of the predicted lateral G. May be. According to such processing, the display pattern P is generated based on the lateral G currently applied to the vehicle, so that the driver accurately understands the relationship between the lateral G currently applied to the vehicle and the display pattern P. Thus, the vehicle operation can be determined. Further, the calculation unit 4 calculates a difference value between the predicted lateral G and the lateral G detected by the vehicle information acquisition unit 2, and sets a coefficient in a calculation formula used for the prediction of the lateral G so that the difference value becomes small. Also good. Further, the calculation unit 4 calculates the inclination of the display pattern P for each of the predicted lateral G and the detected lateral G, and the display pattern generation unit 6 displays the display pattern P corresponding to each of the predicted lateral G and the detected lateral G. May be generated. According to such a process, the driver can determine the vehicle operation by understanding the lateral G predicted based on the current lateral G.

[Operation of map information acquisition unit]
The map information acquisition unit 2 plots a point where the curvature of the road changes, calculates the curvature of the plotted point and the distance from the current position of the vehicle to the plotted point, and outputs it to the calculation unit 4. Specifically, it is assumed that the vehicle A is passing the road R as shown in FIG. The road R shown in FIG. 2 has a right curve with a curvature of 300 m in the right direction from the position X1, and has a right curve with a curvature of 200 m at the position X2. Further, at the position X3, the curve is a left curve with a curvature of 300 m. In this case, the map information acquisition unit 2 calculates the curve start position and curvature from the road shape. That is, since the road R curves to the right at the position X1, the map information acquisition unit 2 plots the position X1. Next, the map acquisition unit 2 calculates the curvature of the right curve as 300 m from the road shape ahead, and associates the calculated curvature with the position X1. Next, the map acquisition unit 2 calculates the distance between the position X1 and the vehicle A, and associates the calculated distance with the position X1. Then, the map information acquisition unit 2 outputs the position X1 and its related information to the calculation unit 4.

  When the curvature of the road continuously changes as between the position X1 and the position X3, the map information acquisition unit 2 sets a threshold value for the amount of change in the curvature, and the position X2 as in the example shown in FIG. Treat the tip as a separate curve. In the example shown in FIG. 2, a new position is set to be plotted when the curvature changes by 100 m, but this value may be changed as a matter of course. In addition, a method of plotting a position away from the position X1 by a certain distance is also conceivable. In this case, the plotting interval may be changed according to the vehicle speed. As another method, the smallest curvature between the position X1 and the position X3 may be used as the curvature between the position X1 and the position X3 without providing a dividing point like the position X2. In the example shown in FIG. 2, since the left curve is ahead of the position X3, the position X3 is newly plotted. For the positions X3 and X4, the same processing as that for the position X1 is performed, and the obtained information is output to the calculation unit 4. How far away from the vehicle position A information is output may be set in consideration of the display described later, may be determined by the speed of the vehicle, or the number of plots may be limited. Good. For example, if the information of up to three plotted positions is notified, the map information acquisition unit 2 outputs up to the information of three points, and does not output the information of the subsequent points. Information is output sequentially in accordance with the display update.

[Configuration of display pattern]
Next, with reference to FIGS. 3A and 3B, the configuration of the display pattern generated by the display pattern generation unit 6 will be described.

  The display pattern generation unit 5 generates an arc-shaped display pattern P as shown in FIGS. 3 (a) and 3 (b). Then, the display pattern generation unit 5 changes the inclination of the display pattern P within a range of 0 to 90 degrees to the left and right according to the direction and the size of the horizontal G applied with the downward direction of the circle as a reference direction. In the figure, lines other than the display pattern P are auxiliary lines for easy understanding. In the present embodiment, the calculation unit 4 calculates the inclination of the display pattern P using the predicted lateral G as a parameter. For example, when the limit turning acceleration of the vehicle is about 0.8G, the calculation unit 4 has a range in which the inclination of the display pattern P is 90 ° and the lateral G is 0 to 0.8G when the lateral G is 0.8G or more. When the angle is within the range, the inclination of the display pattern P is calculated so that the inclination is linearly interpolated with an angle in the range of 0 to 90 ° (for example, the lateral G is proportional to the angle). The lateral G where the inclination of the display pattern P is 90 ° may not be the same value as the limit turning acceleration of the vehicle, and may be a value that allows for an appropriate margin, such as 80% of the limit turning acceleration.

  According to such a display pattern P, since the inclination of the display pattern P is a display reminiscent of the movement in which the pendulum swings due to centrifugal force, the driver intuitively determines the lateral G to be applied to the vehicle from now on based on the inclination of the display pattern P. Can be understood. In addition, when the display pattern P is rotated with the center point of the circle as a reference, the display pattern P always moves on the circumference. For example, the display unit 7 is not a display device such as a liquid crystal display, but LEDs are arranged. Even in the case of a display device, LEDs may be arranged on the circumference, and display can be performed at a low cost.

  In the present embodiment, the display pattern generation unit 5 changes the size of the display pattern P according to the distance between the plotted position output from the map information acquisition unit 2 and the host vehicle. Specifically, when the distance between the plotted position output from the map information acquisition unit 2 and the host vehicle is long, the display pattern generation unit 5 determines the size of the display pattern P as shown in FIG. If the distance is reduced and the distance is short, the display pattern generation unit 5 increases the size of the display pattern P as shown in FIG.

  Further, as shown in FIGS. 5 and 6, the display pattern generation unit 5 may generate a plurality of display patterns P. In the example shown in FIGS. 5 and 6, it is assumed that the vehicle is traveling on the road R shown in FIG. 2 at the same speed. In the example shown in FIG. 5, since the vehicle is located in front of the point X1, the map information acquisition unit 2 outputs the information of the positions X1, X2, and X3 to the calculation unit 4, and the display pattern generation unit 5 calculates the calculation by the calculation unit 4. Display patterns P2, P3, and P4 are generated based on the result. The display pattern P1 is generated using the lateral G information from the vehicle information acquisition unit 3. On the other hand, in the example shown in FIG. 6, since the vehicle is located between the point X1 and the point X2, the map information acquisition unit 2 outputs information on the positions X2 and X3 to the calculation unit 4. Information on the position X1 is not output because the vehicle has already passed. Actually, there is a case where a new plot is generated at the end of the position X3 and the information of the point is output, but here it is omitted for simplification of description. The display pattern generation unit 5 generates display patterns P2 and P3 based on the calculation result of the calculation unit 4. The display pattern P1 is generated using the lateral G information from the vehicle information acquisition unit 3.

  In the examples shown in FIGS. 5 and 6, the display patterns with the same reference numerals indicate the curvature and the curve direction at the same point. When the vehicle passes through the point X1, the radius of the display pattern P increases as the distance between the vehicle and each point decreases, so that it can be seen that the display pattern P has moved outward as a result. Note that the inclination of the display pattern does not change because the vehicle speed is the same in the example shown in FIG. 5 and the example shown in FIG. Further, when the vehicle passes the point plotted by the vehicle information acquisition unit 3, the information regarding the point is not output, so that the display pattern P <b> 1 generated based on the lateral G detected by the vehicle information acquisition unit 3 is switched. Therefore, the predicted horizontal G is obtained by matching the radius of the display pattern P when the distance is 0 and the radius of the display pattern P1 generated based on the horizontal G detected by the vehicle information acquisition unit 3. The display pattern indicating the lateral G applied to the current vehicle is continuous, which is easy for the driver to understand. In the present embodiment, the plurality of display patterns are displayed on the concentric circles. However, the display patterns are not necessarily displayed on the concentric circles. For example, a vertical offset that varies depending on the distance from the vehicle is set for each display pattern. And a plurality of display patterns may be displayed so as to be arranged vertically.

  5 and 6, it can be seen that the display patterns P3 and P2 are greatly inclined. As described above, since the inclination of the display pattern is a turning acceleration predicted to be applied to the vehicle, it can be seen that the current speed of the vehicle is too high with respect to the points indicated by the display patterns P3 and P2. FIG. 7 shows a display pattern when the driver decreases the speed by looking at the display pattern shown in FIG. 5 and proceeds to the same position as that in FIG. Looking at the display pattern shown in FIG. 7, since the position of the vehicle is the same as in FIG. 6, the radius of each arc is the same as in FIG. 6, but the vehicle speed is low and the vehicle is added or will be added Since the horizontal G is low, the inclination of the display pattern is small. This shows that the speed of the vehicle is more appropriate for the road shape ahead. Thus, according to this display pattern, the driver can determine whether the vehicle speed is appropriate for the curvature of the road ahead before actually entering the corner or viewing the corner. The vehicle operation such as the deceleration operation can be performed in advance.

  As mentioned above, although embodiment which applied the invention made by the present inventors was described, this invention is not limited by description and drawing which make a part of indication of this invention by this embodiment. That is, other embodiments, examples, operational techniques, and the like made by those skilled in the art based on the present embodiment are all included in the scope of the present invention.

It is a block diagram which shows the structure of the vehicle-mounted display apparatus used as embodiment of this invention. It is a figure which shows an example of the road used as the object which produces | generates a display pattern. It is a schematic diagram which shows the display pattern used as embodiment of this invention. It is a schematic diagram which shows a mode that the magnitude | size of a display pattern changes according to the distance between the position which a display pattern shows, and the present position of the own vehicle. It is a schematic diagram which shows the display pattern displayed when a vehicle is located in the position X1 shown in FIG. FIG. 3 is a schematic diagram showing a display pattern that is displayed when the vehicle is positioned between a position X1 and a position X2 shown in FIG. It is a schematic diagram which shows the display pattern displayed when a vehicle speed is slower than the state shown in FIG.

Explanation of symbols

1: vehicle-mounted display device 2: map information acquisition unit 3: vehicle information acquisition unit 4: calculation unit 5: display pattern generation unit 6: display unit P: display pattern

Claims (4)

Map information acquisition means for acquiring map information around the vehicle;
Vehicle information acquisition means for acquiring vehicle information of the host vehicle;
A turning acceleration estimating means for estimating a turning acceleration applied to the vehicle based on the map information acquired by the map information acquiring means and the vehicle information acquired by the vehicle information acquiring means;
Display pattern generating means for generating a display pattern visually indicating the turning acceleration applied to the vehicle based on the turning acceleration estimated by the turning acceleration estimating means;
A vehicle-mounted display device comprising: display means for displaying the display pattern generated by the display pattern generation means. The in-vehicle display device according to claim 1,
The display pattern generating means generates a display pattern having an arc shape and having an inclination as viewed from the center point of the arc with respect to the lower direction of the display changing according to the turning acceleration. Display device. In the in-vehicle display device according to claim 1 or 2,
The turning acceleration estimating means estimates turning acceleration applied to the vehicle at a plurality of points at different distances from the vehicle, the display pattern generating means generates the display pattern for each point, and the display means displays each point. An in-vehicle display device that displays a pattern. The in-vehicle display device according to claim 3,
The on-vehicle display device, wherein the display pattern generation unit changes a display mode of the display pattern according to a distance from the vehicle.

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