JP2008070998A - Vehicle surrounding information display device - Google Patents

Abstract

【Task】
To provide a vehicle surrounding information display device that easily displays the expected courses of the host vehicle and surrounding vehicles in an appropriate form and intuitively grasps how dangerous the current course is.
[Solution]
In the vehicle surrounding information display device that displays the current position and the predicted future position of the host vehicle and the vehicle traveling around the host vehicle, the collision grace time calculated from the relative position and relative speed with respect to the other vehicle, Calculate the degree of danger from the speed, the coefficient of friction of the road surface, and the visibility of the surroundings, and change the prediction time range for displaying the predicted future position according to the degree of danger, or according to the degree of danger The range of the display distance for displaying the predicted future position is changed.
[Selection] Figure 2

Description

  The present invention relates to a vehicle surrounding information display device for visually displaying the degree of danger around a running vehicle and assisting safe driving.

  A technique is disclosed that searches for the current position / directivity angle of the host vehicle and the positions of surrounding objects, and predicts and displays a future traveling locus (Patent Document 1). A technology is disclosed in which a risk level is determined from a positional relationship with surrounding objects and vehicle behavior detection means, and a perspective display level, a display size of a template representing a vehicle surrounding object, a display color, and the like are changed according to the risk level ( Patent Document 2). Based on the past and current behavior information of the host vehicle and other vehicles, those that may cause danger in the near future are predicted as dangerous vehicles, and characters are displayed on the display showing the positional relationship and speed between the host vehicle and other vehicles. A technique for warning a dangerous situation by using voice or voice is disclosed (Patent Document 3).

JP-A-10-185591 JP-A-7-223488 JP 2006-85285 A

  In the prior art, as disclosed in, for example, Patent Document 1, a device that predicts and displays the future traveling trajectory of the host vehicle or another vehicle is disclosed. However, the display method of the predicted trajectory is a special device. Was not done. In other words, since the predicted trajectory is only displayed with an arrow, the final arrival point within the predicted time range is known, but the position at the moment is difficult to understand, and it is difficult to intuitively grasp the risk level. Also, there is no particular consideration for the length of the predicted trajectory and the predicted time range, and there is no significant difference in the predicted trajectory that is displayed even when the vehicle is traveling in a dangerous situation. It was difficult for a person to intuitively recognize that the situation was dangerous. The present invention provides a vehicle surrounding information display device for assisting safe driving by changing the degree of danger intuitively felt by the driver in accordance with the degree of danger of the driving situation.

  In order to solve the above problems, in the vehicle surrounding information display device of the present invention, the risk of collision is calculated from the predicted course of the host vehicle and other vehicles and the surrounding environment, and the predicted course until how many seconds later depending on the degree of risk. A display control unit for determining whether or not to display. Preferably, the higher the degree of danger, the longer the time for prediction display. The vehicle surrounding information display device of the present invention further includes a display control unit that determines how many meters before and after the predicted course is displayed according to the degree of risk. Preferably, the higher the degree of danger, the wider the distance range for predictive display. Furthermore, as a method of displaying the predicted positions of the own vehicle and other vehicles, it is preferable to have a function of displaying a plurality of the current positions of the respective vehicles and the predicted positions of the respective vehicles at equal time intervals.

  According to the vehicle surrounding information display device of the present invention, appropriate information can be provided to the driver according to the degree of danger, and safe driving can be supported. That is, when the degree of risk is low, the predicted time range or the display distance range can be shortened to eliminate redundant information and inform the driver that the situation is safe. On the other hand, when the degree of danger is high, the predicted time range or display distance range can be lengthened to visually notify the anticipated dangerous situation, prompting driving that ensures safety to the farther future, and collision It can be recognized that the danger of is imminent.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view of a vehicle surrounding information display device according to the present invention. The vehicle surrounding information display device 1 is provided with an input port 2A and an input port 2B for inputting a signal from an external controller, and a risk level determination device for determining the risk level of the driving situation from the situation and environment around the vehicle. 3. A display controller 4 for controlling the form of an image to be displayed and a display 5 are provided. Signals from the host vehicle course predictor 6 and the other vehicle course predictor 7 provided outside are input to the input port 2A, and image information for displaying the predicted course of the host vehicle or other vehicle on the display 5 or the like. Is passed. Although the present invention is not related to the predicted route calculation method of the own vehicle route predictor 6 and the other vehicle route predictor 7, the route is determined from information such as a surrounding recognition camera attached to the vehicle, inter-vehicle communication, or GPS. It is assumed to make a prediction. The input port 2B includes a road surface condition detector 8 that detects the slipperiness of the road surface based on ambient weather, road surface conditions, or sensor information from a wiper switch (not shown), the presence or absence of ambient brightness or fog, or not shown. Based on the information from the surrounding visibility determining unit 9 that determines the surrounding visibility from the lighting state of the lighting device, and the own vehicle course predictor 6 and the other vehicle course predictor 7, the collision grace time ( Time To Collision: hereinafter referred to as TTC) is input with a signal from the collision grace time calculator 10 for calculating. In the risk determination unit 3, for example, the risk level around the vehicle is determined by an expression as shown below, and is output to the display controller 4.

Risk level = k (1 / TTC) (1 / μ) (1 / R) (Equation 1)
Here, TTC is a collision postponement time, μ is a road surface friction coefficient output from the road surface condition detector 8, R is a viewing distance which is an output from the surrounding visibility determiner 9, and k is a coefficient applied to the entire equation. is there. The meaning of this expression is that the risk is determined to be higher as the TTC becomes shorter, the road surface friction coefficient becomes smaller, and the surrounding visual recognition distance becomes shorter.

Next, the display controller 4 controls the display form based on the input risk information. The processing contents in the display controller 4 include a task for determining how many seconds later the predicted course of the host vehicle or other vehicle is displayed (hereinafter referred to as a predicted time range). Predicted course information until a sufficient time has elapsed is input from the own vehicle course predictor 6 and the other vehicle course predictor 7 (for example, after 10 seconds and after 20 seconds), and all the predicted courses are displayed. Is not always good. In other words, when the degree of risk is low, such as when the distance to the surrounding vehicle is far away, it is preferable to shorten the prediction time range so that redundant information is not displayed. On the other hand, when the lane change, the vehicle is imminent from the rear and TTC is short, the road surface is slippery and the vehicle is unstable, etc. It is necessary to encourage driving while ensuring safety, or to let the driver visually recognize how dangerous it is to drive on the current predicted course.

  For example, FIG. 2 is an example of a prediction display when the degree of danger is low, and the own vehicle is going to change lanes, and another vehicle is traveling behind the changed lane. In the case of this example, the predicted time range is determined as 2 seconds, and the current position of the host vehicle and the predicted positions after 1 second and 2 seconds are drawn. As in this example, it is preferable that the time intervals for predictive display are equal intervals so that the locus can be easily grasped intuitively. In this example, the prediction time interval is determined to be 1 second. The predicted position can be displayed in a broken line or the drawing line can be thinned so that it can be easily distinguished from the current position. The current position of the other vehicle is not within the drawing range, and the predicted positions after 1 second and 2 seconds are displayed in broken lines. When the degree of danger is low, there is no danger of an imminent collision such as a sufficiently long TTC. Therefore, the predicted course is displayed for an unnecessarily long time, or all predicted courses of other vehicles are displayed. The information becomes annoying for the driver.

  On the other hand, FIG. 3 shows an example of the prediction display when the degree of risk is high. The prediction time range is determined to be 6 seconds, and the prediction time interval is determined to be 3 seconds. In this example, the relative speed of the following vehicle is high and the risk is high because the TTC is short. Alternatively, when the braking distance becomes long due to a snowy road or the like, the prediction time range is set to be long because the degree of danger is high. In this example, since the display distance range becomes longer due to the longer prediction time range, the viewpoint to be drawn is changed obliquely backward. This makes it easy to see and display the display range on the display when it is necessary to make the drawing range vertically long if it is a normal view from directly above, or to reduce the drawing size when it cannot be displayed in the display. It is possible to display with a small size. Since the display may also be used as another information display such as a display screen of a car navigation system, such a display method is devised. In addition, since the vehicle interval appears to be shortened by using a perspective from behind, there is also an effect that it is easier to call the driver's attention than a viewpoint from directly above when the degree of danger is high. As described above, the method for determining the predicted time range according to the risk level may be determined so that the predicted time range is simply increased in proportion to the magnitude of the risk level, or the predicted time range with the risk level as a variable. It may be determined using a function or a two-dimensional map in which the range monotonously increases.

  When the predicted time range is determined, the predicted courses of the host vehicle and other vehicles within that time are calculated, and the drawing viewpoint is set so that the area of the display range when drawing all predicted courses is less than the specified value. decide. In the case of a lane change as in the present embodiment, the position of the drawing viewpoint moves from right above to diagonally backward as the reach distance is longer. When the degree of risk is low as in the example of FIG. 2 (when it is below a certain threshold), it is not necessary to draw all the predicted courses of other vehicles behind, and the current position of other vehicles and some of the predicted positions are You may remove from a drawing range. In this case, the rear display distance range of how many meters behind the subject vehicle may be drawn may be determined using a function that increases monotonically with the degree of risk or a two-dimensional map.

  The above mainly describes the vehicle surrounding information display device that changes the range of the predicted time for displaying the future predicted position according to the degree of risk, but the display distance for displaying the future predicted position according to the degree of risk is described. The same argument holds for the vehicle surrounding information display device that changes the range, the display distance range is determined according to the degree of danger, and the drawing viewpoint is determined so that the area of the display range on the display is less than the specified value Is done.

  The drawing area on the display is normally controlled to be constant, but when the degree of danger is extremely high, a warning can be given to the driver by displaying the entire screen as shown in FIG. Such a change in the drawing area may be performed only in two stages of the normal display range and the full screen display, or the drawing area may be increased stepwise according to the degree of risk.

  In the predicted route display method according to the present invention, as shown in FIG. 5, the locus of the predicted route may be superimposed and displayed at the predicted position for each predicted time interval. Alternatively, the speed vector at each predicted position may be superimposed and displayed. Furthermore, there may be a character display indicating how many seconds later each predicted position is, or a distinction by color.

The schematic diagram which showed the vehicle surrounding information display apparatus and other peripheral device as one Example of this invention. The figure which showed the display at the time of a low risk as one Example of this invention. The figure which showed the display at the time of high risk as one Example of this invention. The figure which showed the change method of the display range on a display as one Example of this invention. The figure which showed the Example at the time of applying another display method to the display of the vehicle surroundings information display apparatus by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle surrounding information display apparatus 3 Risk level determination device 4 Display controller 5 Display

Claims (5)

  In the vehicle surrounding information display device that displays the current position and the predicted future position of the host vehicle and the vehicle traveling around the host vehicle, the collision grace time calculated from the relative position and relative speed with respect to the other vehicle, A vehicle surrounding information display characterized by calculating a risk level from speed, a road surface friction coefficient, and surrounding visibility, and changing a prediction time range for displaying a predicted future position according to the risk level. apparatus.   In the vehicle surrounding information display device that displays the current position and the predicted future position of the host vehicle and the vehicle traveling around the host vehicle, the collision grace time calculated from the relative position and relative speed with respect to the other vehicle, A vehicle surrounding information display characterized in that a risk is calculated from speed, a road surface friction coefficient, and surrounding visibility, and a range of a display distance for displaying a predicted future position is changed according to the risk. apparatus.   3. The vehicle surrounding information display device according to claim 1 or 2, wherein a method of displaying the predicted future positions of the host vehicle and other vehicles is a method of indicating a future trajectory of the vehicle with an arrow vector, A vehicle surroundings information display device using at least one of methods for displaying a plurality of predicted positions.   3. The vehicle surrounding information display device according to claim 1, wherein when the display distance range is narrow, the display distance range is wide and the display distance range is wide as the display distance range changes. The vehicle surrounding information display device, characterized in that the display is performed from the perspective from the rear diagonally upward or front diagonally upward. 3. The vehicle surrounding information display device according to claim 1 or 2, wherein when the risk level is low, the display range on the display screen is limited to a small area, the risk level is increased and the display range is expanded. A vehicle surrounding information display device characterized in that when the value becomes extremely high, full screen display is performed and the display is blinked to perform highlighting.

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