TECHNICAL FIELD OF THE INVENTION
The present invention presents driving assistance information such as accident information, fallen object information, road construction information, and traffic congestion information to a driver for a traveling vehicle such as an automobile in order to improve safety. At this time, the present invention relates to a driving support presentation method of selecting more urgent driving support information and presenting it with priority when a plurality of driving support information are input at the same time.
In order to improve safety, it is possible to provide a driver with information on an obstacle existing ahead in order to improve safety, as in a driving support device or a forward obstacle collision prevention system described in JP-A-2002-269699 (Patent Document 1). Has been devised. This allows the driver to take an action to avoid a dangerous event in advance. There are a wide variety of events to be notified to the driver. However, it is considered that each event is provided individually to the driver, and the case where a plurality of events occur at the same time is not particularly considered.
[Patent Document 1]
[Problems to be solved by the invention]
When a plurality of events occur simultaneously, it is important to select the most important event and inform the driver in order to make the driver's judgment appropriate. In the conventional driving support presentation method, there is a problem that a plurality of pieces of driving support information are presented and the driver is confused.
[Means for Solving the Problems]
In order to solve the above-mentioned problems, in the driving support presentation method of the present invention,
(1) Calculate a predicted time until an event to be avoided occurs when the driver does not take an avoidance action, based on travel assistance information input from the outside by wireless or the like or travel assistance information from an in-vehicle sensor. ,
(2) The one having the shortest calculation time is selected and presented to the driver with priority.
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described. FIG. 1 shows an example of the overall configuration of the present invention. The vehicle 1 includes a wireless communication unit 32 that receives driving support information via wireless communication, in-vehicle sensors 341 and 342 that detect lane departure and an under-vehicle distance, an HMI unit 33 that presents driving support information to the driver 2, and these parts. And a control unit for controlling these parts. Roadside sensors 5 for detecting accident information, obstacles and stopped vehicles, traffic congestion information, and the like, access points 41 and 42 for transmitting driving support information from the sensors to vehicles, and roadside sensors as infrastructure for transmitting driving support information from outside. 5 and a network 6 connected to the access points 41 and 42.
In the present invention, the driver's safety is ensured by appropriately presenting information from the roadside sensor 6 and the in-vehicle sensors 341 and 342 to the driver 2 through the HMI unit.
FIG. 2 shows a driving support information presentation processing block. The control unit 31 receives the driving support messages from the wireless communication unit 32 and the sensors 341 and 342 in the vehicle, performs appropriate priority processing, and presents the message to the driver in the HMI unit 33.
Before describing the details of the processing, first, a message format input from the wireless communication unit 32 and the in-vehicle sensors 341 and 342 to the control unit 31 will be described. FIG. 4 shows a format of a driving support message sent from the roadside sensor 5 to the access points 41 and 42 and the wireless communication unit 32. A message code 811, which indicates the type of the message, is included at the beginning, followed by a data body 812, which is the detailed content of the message, and a last field transmission source position 813, which includes the transmission source, ie, the position information (latitude and longitude) of the roadside sensor 5. FIG. 5 shows a format of a driving support message from the in-vehicle sensors 341 and 342. The message code 821 and the data body 822 include information having the same meaning as in the case of the roadside sensor 5. The calculated distance 823, which is the last field, includes the distance from the vehicle, not the position of the event.
Returning to the description of FIG. 2, the classifier 311 classifies the driving support messages. That is, the events for which the urgency can be determined are separated and priorities are assigned irrespective of the time until the event occurs. This processing is performed using the classification judgment table shown in FIG. That is, classification is performed by the message code. That is, an event that leads to a direct accident such as a lane departure, an inter-vehicle distance shortage, an obstacle, a stopped vehicle, or the like is classified as a high-priority class 1. On the other hand, a class having a low possibility of directly leading to an accident, such as occurrence of traffic congestion or a small road surface friction coefficient, is assigned to a low priority class.
The event occurrence time calculation units 3121 and 3122 calculate the time at which an event that has issued a warning as a driving support message may occur for the driving support messages classified by the classifier 311. In the case of the driving support message 81 from the roadside sensor 5, this is from the position of the transmission source and the position of the vehicle (here, it is assumed that the own position is known by the car navigation system) to the event position. Is calculated by using the own traveling speed. In the case of the travel support message 82 from the in-vehicle sensors 341 and 342, since the calculated distance 823 is included, it can be calculated using this value and the own travel speed. The calculated distance 823 will be described later.
The integrated determination unit 313 sends a driving support message of a high class, or a message of short time until an event occurs in the case of the same class, to the HMI unit 33 and presents it to the driver 2. The HMI unit 33 presents the message for a certain time. When a driving support message having a higher priority is input, the driving support message is interrupted and presented. FIG. 8 shows an example of presentation of the HMI unit 33. The message is overlapped and displayed on the screen 331 of the car navigation system, and a warning message is presented by voice from the speaker 332.
A method of calculating the calculated distance 323 of the driving support message 82 from the in-vehicle sensors 341 and 342 will be described with reference to FIGS. FIG. 6 shows a process flow 9 of the sensor. When the vehicle operates, an initialization process for the sensor is performed in a processing step 901, and sensing is started. In step 902, it is monitored whether an event has occurred. If the event has occurred, in step 903, the distance at which the event occurs from the host vehicle is calculated. For example, as shown in FIG. 7, when the sensing event is a lane departure, a calculation is made as to how far the vehicle will depart from the lane. If the inter-vehicle distance is too small, the inter-vehicle distance is itself. In addition, when the information such as the road surface friction coefficient is smaller than a predetermined value, the information is set as a predetermined converted distance. In this way, the in-vehicle sensors 341 and 342 can calculate the calculated distance, and can transmit the driving support message 82 to the control unit 31.
【The invention's effect】
As can be understood from the above description, the driving support information in which the event will occur earlier than the present invention, that is, the most urgent one can be given to the driver with priority. Therefore, even when a plurality of pieces of driving assistance information are input, the most important information is presented, so that the user can use the driving assistance information without being confused, thereby improving driver safety. Is effective.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of an embodiment of the present invention.
FIG. 2 is a block diagram of a driving support information presentation process according to the embodiment of the present invention.
FIG. 3 is a determination table for classifying a driving support message according to the embodiment of the present invention.
FIG. 4 is a diagram showing a format of a driving support message from the outside according to the embodiment of the present invention.
FIG. 5 is a diagram showing a format of a driving support message from an in-vehicle sensor according to the embodiment of the present invention.
FIG. 6 is a diagram showing a processing flow of an in-vehicle sensor in the embodiment of the present invention.
FIG. 7 is a table for an in-vehicle sensor to calculate a distance to an event in the embodiment of the present invention.
FIG. 8 is a diagram illustrating an example in which the HMI unit presents driving assistance information to a driver in the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Automobile, 31 ... Control part, 32 ... Wireless communication part, 33 ... HMI part, 341,342 ... In-vehicle sensor, 41,42 ... Access point, 5 ... Roadside sensor, 6 ... Network.