Display device and display method of vehicle behavior

Abstract

To provide a display device and a display method that make it easy to grasp lateral acceleration at each position on a driving trajectory.SOLUTION: A display device disclosed in this specification draws a band along a driving trajectory of a vehicle on the opposite side of the lateral acceleration of the vehicle at each position on the driving trajectory, with a width corresponding to the magnitude of the lateral acceleration at each position. When the vehicle turns a curve, the vehicle experiences lateral acceleration toward the inside of the curve. The display device disclosed in this specification draws a band along the driving trajectory of the vehicle that extends to the outside of the curve. The wider the lateral acceleration is, the wider the band is.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to a display device and a display method for vehicle behavior (particularly, lateral acceleration). [Background technology]

[0002] Patent Document 1 discloses a display device that displays a vehicle's travel path and vehicle acceleration. Patent Document 2 discloses a device that displays a recommended acceleration for the vehicle's forward travel path. The display device in Patent Document 1 displays the travel path, speed, and acceleration in separate windows. Speed ​​is represented by a time chart with the horizontal axis representing time and the vertical axis representing speed. Acceleration is represented by a graph with the vertical axis representing longitudinal acceleration and the horizontal axis representing lateral acceleration. The display device in Patent Document 1 is used to evaluate driving skills. Hereinafter, lateral acceleration occurring in a vehicle may be simply referred to as "lateral acceleration," and longitudinal acceleration of a vehicle may be simply referred to as "longitudinal acceleration." [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-133023 [Patent Document 2] International Publication No. 2015 / 029181 Summary of the Invention [Problem to be solved by the invention]

[0004] When the driving locus and the acceleration are displayed separately, it is difficult to grasp the correspondence between each position on the driving locus and the acceleration at that position. This specification provides a display device and a display method that make it easy to grasp the lateral acceleration at each position on the driving locus. [Means for solving the problem]

[0005] The display device disclosed in this specification displays the behavior of a vehicle. The display device draws bands along the vehicle's travel path, the width of which corresponds to the magnitude of the vehicle's lateral acceleration at each point on the vehicle's travel path. The band representing acceleration is drawn on the opposite side of the travel path to the direction of lateral acceleration. When a vehicle turns a curve, the vehicle experiences lateral acceleration toward the inside of the curve. The display device disclosed in this specification draws bands along the travel path that extend to the outside of the curve. The greater the lateral acceleration, the wider the band width.

[0006] With the display device disclosed in this specification, it is clear that the wider the band, the greater the lateral acceleration at that position. With the display device disclosed in this specification, the user can easily grasp the lateral acceleration at each position on the driving trajectory. If the width of the band drawn on a curve is constant, it means that the lateral acceleration is constant, and if the width of the band varies greatly, it means that the lateral acceleration on the curve varies greatly. In other words, with the display device disclosed in this specification, it is possible to understand at a glance the driver's skill when turning a curve. The display device disclosed in this specification is suitable for evaluating the skill of a driver driving on a circuit. The display device may draw the driving trajectory together with the band.

[0007] The display device disclosed herein may further vary the color or density of the band at each position depending on the magnitude of the vehicle's longitudinal acceleration. For example, the display device may use a darker color to depict the driving trajectory as the longitudinal acceleration increases. The colors representing forward and backward acceleration may be selected to be complementary colors. This display device allows the user to easily grasp the lateral acceleration and longitudinal acceleration at each position on the driving trajectory.

[0008] The display device disclosed in this specification may further display overlapping bands representing multiple vehicles that have traveled a single route. This display device allows the driver's skill level to be easily understood. The upper band may be drawn so that the lower band can be seen through.

[0009] This specification also provides a display method that makes it easy to grasp the lateral acceleration at each position on a driving trajectory. This display method involves drawing a band along the driving trajectory, the width of which corresponds to the magnitude of the lateral acceleration at each position on the vehicle's driving trajectory, on the side opposite to the direction of the lateral acceleration. This display method may further vary the color or density of the band at each position depending on the magnitude of the vehicle's longitudinal acceleration. Additionally, this display method may also draw a line of constant width driving trajectory superimposed on the band. This display method may also draw superimposed bands of multiple vehicles that traveled a single route.

[0010] Details and further improvements of the technology disclosed in this specification are described in the following "Description of Embodiments of the Invention." [Brief explanation of the drawings]

[0011] [Figure 1] 10 is an example of a screen of a display device according to an embodiment. [Figure 2] 10 is another display example of the display device of the embodiment. [Figure 3] This is an example of the display of the driving trajectory and acceleration band of another vehicle. [Figure 4] This is an example of multiple driving trajectories and acceleration bands displayed in an overlapping manner. [Figure 5] FIG. 1 is a block diagram showing the structure of a display device. DETAILED DESCRIPTION OF THE INVENTION

[0012] A display device 10 according to an embodiment will be described with reference to the drawings. FIG. 1 shows an example of a screen 11 of the display device 10. The display device 10 displays on the screen 11 a travel path 13 of a car traveling along a circuit course 12 and a band 14 representing the magnitude of the car's lateral acceleration. The travel path and lateral acceleration are parameters that represent the behavior of the car. In other words, the display device 10 is a device that represents the behavior of the car. The behavior of the car may also include longitudinal acceleration and speed. The display device 10 may display these parameters.

[0013] In FIG. 1, the travel path 13 is depicted by a thick line of a constant width. Also, arrow A in FIG. 1 indicates the travel direction of the vehicle. Arrow A is an auxiliary drawing to facilitate understanding in this specification and may not actually be present. In the following, for ease of explanation, the "band 14 representing the magnitude of the lateral acceleration of the vehicle" may be expressed as the "band 14 representing the lateral acceleration of the vehicle" or simply as the "band 14 of lateral acceleration."

[0014] A band 14 representing lateral acceleration is drawn along the travel trajectory 13. The display device 10 draws the band 14 representing lateral acceleration so that its edge is in contact with the travel trajectory 13. The width W of the band 14 corresponds to the magnitude of the lateral acceleration of the vehicle at each position on the travel trajectory 13. In other words, the width W of the band 14 is proportional to the magnitude of the lateral acceleration of the vehicle at each position on the travel trajectory 13. The proportionality constant used to convert the lateral acceleration to the width W is appropriately determined so as to be easy for the user to see.

[0015] The band 14 representing lateral acceleration is drawn on the side opposite to the direction of lateral acceleration at each position on the travel path 13. The lateral acceleration of the vehicle faces toward the inside of the curve. Therefore, the band 14 representing lateral acceleration is drawn on the outside of the curve along the travel path. In other words, the width W of the band 14 representing lateral acceleration is proportional to the magnitude of the lateral acceleration at each position on the travel path 13, and the band 14 is drawn along the travel path 13 on the outside of the curve of the travel path 13. The band 14 is drawn on the outside of the curve of the travel path 13 so that its edge is tangent to the travel path 13.

[0016] In other words, the band 14 extending to the outside of the curve of the travel path 13 represents the centrifugal force acting on the driver. The wider the width W, the greater the lateral acceleration and the greater the centrifugal force acting on the driver.

[0017] The display device 10 draws a band 14, whose width W corresponds to the lateral acceleration, along the travel path 13. This display mode allows the user to easily grasp the magnitude of the lateral acceleration at each position on the travel path.

[0018] The magnitude of lateral acceleration in a curve depends on the driver's skill (steering and accelerator work). Even if steering work changes frequently, the fluctuation (fluctuation) in the driving route is slight, making it difficult to determine the steering work from the driving route. However, slight changes in steering work have a significant impact on lateral acceleration. Fluctuations in the width W of the band 14 indicate fluctuations in steering work. Furthermore, lateral acceleration changes significantly when the driver brakes hard in the middle of a curve. A small change in the width W of the band 14 means that steering and accelerator work were performed so as not to cause a sudden change in lateral acceleration. The display device 10 is suitable for evaluating the driver's skill.

[0019] Since no lateral acceleration occurs while the vehicle is traveling straight, the width W of the band 14 is zero.

[0020] The driving trajectory data is obtained from a positioning sensor mounted on the vehicle. The lateral acceleration at each position on the driving trajectory is obtained from an acceleration sensor mounted on the vehicle. Alternatively, the lateral acceleration can be determined from a sequence of points on the driving trajectory. The vehicle speed can be obtained from the spacing between the points. The curvature of the curve can be obtained from the arrangement of the points. The lateral acceleration can be determined from the curvature of the curve and the vehicle speed. The display device 10 generates and displays a driving trajectory 13 and a lateral acceleration band 14 using the driving trajectory data (and lateral acceleration data) obtained from the vehicle that traveled on the course 12.

[0021] FIG. 2 shows another example of the screen 11 of the display device 10. In FIG. 2, the width W of the band 14 corresponds to the magnitude of the lateral acceleration, and the color (or color intensity) of the band 14 corresponds to the longitudinal acceleration of the vehicle. A bar graph 16 representing the correspondence between color intensity and acceleration is displayed in the lower right corner of the screen 11. Although it is difficult to see because the image is monochrome, the colors representing forward acceleration and backward acceleration are selected to have a complementary relationship. For example, backward acceleration is represented by red, and forward acceleration is represented by green. Red and green are complementary colors. Furthermore, the greater the absolute value of the acceleration, the darker the color of the band 14. In the case of corner B in FIG. 2, band 14a near the corner entrance is drawn in dark red, and band 14c near the corner exit is drawn in dark green. Band 14b near the center of the corner is drawn in light red or light green. These color schemes allow the user to easily grasp the longitudinal acceleration as well as the lateral acceleration at each position on the driving trajectory 13.

[0022] The band 14, whose width W indicates the magnitude of the lateral acceleration, may be color-coded according to the longitudinal acceleration, and the lines of the travel locus 13 may be color-coded according to the speed of the vehicle.

[0023] FIG. 3 shows an example of a driving trajectory 23 of another car that traveled on course 12 of the circuit, and a band 24 of lateral acceleration. Driving trajectory 23 is drawn with a thick dotted line of a constant width. The width of band 24 corresponds to the magnitude of the lateral acceleration of the car at each position on driving trajectory 23. Band 24 is drawn along driving trajectory 23. Band 24 is drawn on the opposite side to the direction of lateral acceleration at each position on driving trajectory 23 (i.e., on the outside of the curve of driving trajectory 23). In the example of FIG. 3, there is a large fluctuation in band 24. In other words, it is easy to see from FIG. 3 that the driver of the car on driving trajectory 23 has poor skill.

[0024] Figure 4 shows an example in which the driving trajectory 23 and band 24 of Figure 3 are superimposed on the driving trajectory 13 and band 14 of Figure 1. In other words, Figure 4 shows the driving trajectories 13, 23 and bands 14, 24 of multiple vehicles that traveled one route (course 12) superimposed on each other. The driving trajectory 23 and band 24 drawn on the upper side are drawn so that the driving trajectory 13 and band 14 drawn on the lower side can be seen through them.

[0025] Band 14 has a gradual change in width at corners. This means that the driver of vehicle trajectory 13 has high driving skills. As mentioned above, the driver of vehicle trajectory 23 has low driving skills. By overlaying the driving paths of multiple vehicles traveling on a single route with the bands (bands representing lateral acceleration), the differences in driver skills can be clearly understood. Furthermore, from the display in Figure 4, drivers with low skills can easily identify the weaknesses in their own skills.

[0026] FIG. 5 shows a block diagram of the structure of display device 10. Display device 10 includes screen 11, computer 18, and storage device 19. Storage device 19 stores data on the vehicle's driving path. Storage device 19 may also store data on the speed, longitudinal acceleration, and lateral acceleration at each position on the vehicle's driving path. Computer 18 displays driving path 13 and band 14 representing lateral acceleration on screen 11 based on the data stored in storage device 19. As described above, computer 18 may calculate the vehicle's speed and lateral acceleration from the sequence of points on the driving path. If data on the driving path, speed, longitudinal acceleration, and lateral acceleration can be obtained from the vehicle, computer 18 may use them to draw band 14.

[0027] As described above, the display device 10 displays the behavior of the vehicle. Specifically, the display device 10 displays a band along the travel path, the width of which corresponds to the magnitude of the lateral acceleration of the vehicle. This display mode makes it easier for the user to grasp the lateral acceleration of the vehicle (in other words, the centrifugal force acting on the driver) at each position on the travel path. The display device 10 is particularly suitable for evaluating the skill of a driver on a circuit or test course. Of course, the technology disclosed in this specification is also suitable for evaluating the skill of ordinary drivers.

[0028] Below, we will describe some points to note regarding the technology described in the embodiments. In Fig. 4, the color coding of the bands 14, 24 according to the longitudinal acceleration of the vehicle has been omitted to facilitate understanding. Even when multiple travel routes and bands are depicted overlapping each other, the bands 14, 24 may be color coded according to the magnitude of the longitudinal acceleration of the vehicle. In addition, the travel trajectories 13, 23 may be color coded according to the magnitude of the vehicle's speed.

[0029] The width W of the strip refers to the length of the strip perpendicular to the direction of travel of the vehicle. The width W of the strip is proportional to the magnitude of the lateral acceleration acting on the vehicle.

[0030] The display device 10 draws a band 14 (24) along the driving path 13 (23) whose width corresponds to the magnitude of the lateral acceleration. It is preferable to draw the driving path 13 (23) together with the band 14 (24), but it is also possible to draw only the band 14 (24) without drawing the driving path 13 (23). This is because it is clear that the edge of the band 14 (24) on the inside of the curve represents the driving path. In this case, if the lateral acceleration is zero, it is preferable to draw the driving path with a thin line. When drawing the driving path in addition to the band representing the lateral acceleration, it is preferable that the display device 10 draws the band representing the lateral acceleration so that its edge is tangent to the driving path.

[0031] The travel path 13 (23) may include the band 14 (24). In this case, the characteristics of the display device disclosed in this specification can be expressed as follows: The display device draws the travel path so that the width of the travel path is proportional to the magnitude of the lateral acceleration of the vehicle at each position. The travel path is drawn so that it spreads out to the outside of the curve. In other words, the inside edge of the curve of the travel path, whose width depends on the lateral acceleration, corresponds to the original travel path.

[0032] When the cursor is placed on the driving trajectory, the lateral acceleration (and speed and longitudinal acceleration) at the cursor position may be displayed in a pop-up format. Also, a band (indicating lateral acceleration) for a predetermined time may be displayed sequentially as a video.

[0033] In the automotive technical field, "acceleration" is sometimes expressed as "G." In this specification, "lateral acceleration" may be expressed as "lateral G," and "longitudinal acceleration" may be expressed as "longitudinal G." Using such notation, the technology disclosed in this specification can also be expressed as follows: That is, the display device (display method) disclosed in this specification draws a band along the driving trajectory, the width of which corresponds to the magnitude of the lateral G of the vehicle at each position on the driving trajectory, on the opposite side to the direction of the lateral G. The display device (display method) disclosed in this specification may change the color or color density of the band at each position on the driving trajectory depending on the magnitude of the longitudinal G of the vehicle.

[0034] This specification also discloses a novel method for displaying the lateral acceleration of a vehicle. The display method disclosed in this specification draws a band along the vehicle's travel path, with a width corresponding to the vehicle's lateral acceleration at each position on the travel path. The band representing the lateral acceleration is drawn on the opposite side to the direction of the vehicle's lateral acceleration at each position on the travel path. In other words, the band representing the lateral acceleration is drawn along the outside of the curve of the travel path. The width of the band (the width in the direction perpendicular to the vehicle's direction of travel) is proportional to the magnitude of the lateral acceleration. In other words, there is a positive correlation between the width of the band and the magnitude of the lateral acceleration.

[0035] In the display method disclosed in this specification, the color or density of the band at each position on the travel path is changed according to the magnitude of the vehicle's longitudinal acceleration at each position, making it easy to grasp the lateral acceleration and longitudinal acceleration at each position on the travel path.

[0036] In the display method disclosed in this specification, the driving trajectory may be drawn as a line of a constant width in addition to the band representing the lateral acceleration. The band representing the lateral acceleration may be drawn so that its edge is in contact with the driving trajectory. The color of the driving trajectory may also be changed according to the vehicle's speed. Furthermore, the bands representing multiple vehicles that have traveled the same driving route (bands representing the lateral acceleration of each vehicle) may be drawn overlapping each other. In this case, the upper band should be drawn so that the lower band can be seen through.

[0037] Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and variations of the specific examples exemplified above. The technical elements described in this specification or drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the technology exemplified in this specification or drawings can achieve multiple objectives simultaneously, and achieving one of these objectives alone is technically useful. [Explanation of symbols]

[0038] 10: Display device 11: Screen 12: Course 13, 23: Travel trajectory 14, 14a, 14b, 14c, 24: Bands representing acceleration 18: Computer 19: Storage device

Claims

1. A vehicle behavior display device that draws a band of a width corresponding to the magnitude of the lateral acceleration of the vehicle at each position on the vehicle's driving trajectory, on the opposite side of the direction of the lateral acceleration along the vehicle's driving trajectory.

2. 2. The display device according to claim 1, wherein the color or color density of the stripe at each of the positions is changed according to the magnitude of the longitudinal acceleration of the vehicle.

3. The display device according to claim 1 or 2, wherein the travel locus is depicted as a line of a constant width superimposed on the band.

4. The display device according to claim 3 , wherein the color of the travel path changes depending on the speed of the vehicle.

5. 3. The display device according to claim 1, wherein the bands of a plurality of cars that have traveled one route are displayed in an overlapping manner.

6. A method for displaying vehicle behavior, which comprises drawing a band along a vehicle's travel path on the opposite side to the direction of the lateral acceleration, the band having a width corresponding to the magnitude of the lateral acceleration of the vehicle at each position on the travel path.

7. 7. The display method according to claim 6, wherein the color or color density of the stripe at each of the positions is changed according to the magnitude of the longitudinal acceleration of the vehicle.

8. The display method according to claim 6 or 7, wherein the travel locus is drawn as a line of a constant width superimposed on the band.

9. The display method according to claim 8 , wherein the color of the travel path is changed according to the speed of the vehicle.

10. 8. The display method according to claim 6, wherein the bands of a plurality of vehicles that have traveled one route are drawn in an overlapping manner.

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