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DE-102025137643-A1 - Vehicle driver assistance system

DE102025137643A1DE 102025137643 A1DE102025137643 A1DE 102025137643A1DE-102025137643-A1

Abstract

A server (100) of a vehicle driver assistance system (10) receives position information wirelessly transmitted via a communication network (150) from a wireless communication terminal (300) possessed by a moving object (350), and transmits destination information to the driver assistance device (200) via the communication network (150) when the server (100) determines, based on the position information, that a passage condition is met. A vehicle driver assistance device (200) of the vehicle driver assistance system (10) performs a notification in a first notification mode to inform an operator of a host vehicle (400) of the presence of a target moving object (350T) when a notification condition is met, and performs the notification in a second notification mode, which differs from the first notification mode, when a target detection condition is met while the notification in the first notification mode is being performed.

Inventors

  • Hikaru AKIMOTO
  • Yasunobu Yokoi

Assignees

  • TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date
20260513
Application Date
20250918
Priority Date
20241111

Claims (10)

  1. Vehicle driver assistance system (10), comprising a vehicle driver assistance device (200) mounted on a host vehicle (400) and a server (100) provided in a communication network (150), the server (100) being configured to: receive position information wirelessly transmitted via the communication network (150) from a wireless communication terminal (300) possessed by a moving object (350); and transmitting destination information to the vehicle assistance device (200) via the communication network (150) when the server (100) determines, based on the position information, that a passage condition is met, the passage condition being a condition that the moving object (350) passes at least one predetermined point in the direction of a predetermined intersection, wherein the at least one predetermined point is a point set on a predetermined junction (510P) and located from the predetermined intersection (500P) by a predetermined distance along the predetermined junction (510P), wherein the predetermined junction (510P) is a road that intersects another road at the predetermined intersection (500P), wherein the destination information is information indicating that the moving object (350) passes the at least one predetermined point on the predetermined junction (510P) in the direction of the predetermined intersection (500P), wherein the vehicle assistance device (200) is configured to perform a notification in a first notification mode to inform an operator of the host vehicle (400) of the presence of a target moving object (350T) when a notification condition is met, wherein the notification condition is a condition that the predetermined intersection (500P) specified by the received destination information corresponds to the target intersection (500P) and the predetermined branch (510P) specified by the received destination information corresponds to the target branch (510T); and perform the notification in a second notification mode, which differs from the first notification mode, when a target detection condition is met, while the Notification is carried out in the first notification mode, wherein the target detection condition is a condition that the target moving object (350T) is directly detected by an in-vehicle device (240) of the host vehicle (400), wherein the target intersection (500T) is an intersection (500) that lies ahead in the direction of travel of the host vehicle (400), wherein the target branch (510T) is a road that intersects a route of travel of the host vehicle (400) at the target intersection (500T), and wherein the target moving object (350T) is a moving object (350) that moves along the target branch (510T) in the direction of the target intersection (500T).
  2. Vehicle driver assistance system (10) according to Claim 1 , wherein the passing condition is a condition that the moving object (350) passes the at least one predetermined point in the direction of the predetermined intersection (500P) and a speed of movement of the moving object (350) is a speed within a predetermined speed range.
  3. Vehicle driver assistance system (10) according to Claim 1 , wherein the at least one predetermined point is a point set such that the arrival time of the moving object is longer than the delay time, the arrival time of the moving object is the time required for the moving object (350) to reach the predetermined intersection after reaching the at least one predetermined point, and the delay time is the time required from the wireless communication of the position information from the wireless communication terminal (300) until the vehicle driver assistance device (200) receives the destination information via the server (100).
  4. Vehicle driver assistance system (10) according to Claim 1 , wherein the notification condition is a condition that the predetermined intersection (500P) specified by the received destination information is the destination intersection (500T), the predetermined branch (510P) specified by the received destination information is the destination branch (510T), and a host vehicle arrival time is a time within a predetermined notification time range, the host vehicle arrival time being the time required from the receipt of the destination information until the host vehicle (400) reaches the destination intersection (500T), and the predetermined notification time range is a range from two seconds to five seconds.
  5. Vehicle driver assistance system (10) according to Claim 1 , wherein the vehicle assistance device (200) is configured to obtain a time until a collision of the host vehicle (400) with the target moving object (350T) as the predicted collision time; and to initiate automatic brake control to slow down and stop the host vehicle (400) when the predicted collision time becomes less than or equal to a predetermined brake start time, wherein the notification condition is a condition that the predetermined intersection (500P) specified by the received destination information is the target intersection (500T), the predetermined junction (510P) specified by the received destination information is the target junction (510T), and a host vehicle arrival time is a time within a predetermined notification time range, wherein the host vehicle arrival time is the time required from receiving the destination information until the host vehicle (400) reaches the target intersection (500T), wherein the predetermined notification time range is a range that is longer than the predetermined brake start time and less than or equal to a predetermined response start time, and wherein the predetermined response start time is the maximum predicted time available to the host vehicle operator (400) is required to initiate an action to avoid a collision between the target moving object (350T) and the host vehicle (400), and is predicted when the notification is initiated in the first notification mode.
  6. Vehicle driver assistance system (10) according to Claim 1 , wherein the at least one predetermined point comprises a first point and a second point, the first point being a point where the predetermined distance is a first distance, the second point being a point where the predetermined distance is a second distance that is longer than the first distance, the passing condition being a condition that the moving object (350) passes the first point in the direction of the predetermined intersection and a speed of movement of the moving object (350) is a speed within a first speed range, or that the moving object (350) passes the second point in the direction of the predetermined intersection (500P) and the speed of movement of the moving object (350) is a speed within a second speed range, and a lower limit of the second speed range is greater than an upper limit of the first speed range.
  7. Vehicle driver assistance system (10) according to Claim 6 , where the speed within the first speed range is a speed of movement normally achieved by a pedestrian moving in the direction of the predetermined intersection (500P), and the speed within the second speed range is a speed of movement normally achieved by a bicycle moving in the direction of the predetermined intersection (500P).
  8. Vehicle driver assistance system (10) according to Claim 1 , wherein the at least one predetermined point comprises a first point, a second point and a third point, the first point being a point where the predetermined distance is a first distance, the second point being a point where the predetermined distance is a second distance which is longer than the first distance, the third point being a point where the predetermined distance is a third distance which is longer than the second distance, the passing condition being a condition that the moving object (350) passes the first point in the direction of the predetermined intersection (500P) and a speed of movement of the moving object (350) is a speed within a first speed range, or that the moving object (350) passes the second point in the direction of the predetermined intersection (500P) and the speed of movement of the moving object (350) is a speed within a second speed range. (500P) and the speed of the moving object (350) is a speed within a second speed range, or that the moving object (350) passes the third point in the direction of the predetermined intersection (500P) and the speed of the moving object (350) is a speed within a third speed range, a lower limit of the second speed range is greater than an upper limit of the first speed range, and a lower limit of the third speed range is greater than an upper limit of the second speed range.
  9. Vehicle driver assistance system (10) according to Claim 8 , where the speed within the first speed range is a speed of movement normally achieved by a pedestrian moving in the direction of the predetermined intersection (500P), the speed within the second speed range is a speed of movement normally achieved by a bicycle moving in the direction of the predetermined intersection (500P), and the speed within the third speed range is a speed of movement normally achieved by a motorcycle or a car moving in the direction of the predetermined intersection (500P).
  10. Vehicle driver assistance system (10) according to Claim 1 , wherein the vehicle-internal device (240) is an image sensor (241) or an electromagnetic wave sensor (242).

Description

BACKGROUND Area The present invention relates to a vehicle driver assistance system. Description of the related prior art A vehicle assistance system is known that executes a notification to inform the driver of a host vehicle of the presence of a moving object approaching an intersection in front of the host vehicle. A vehicle assistance system is also known that provides the host vehicle with wireless communication information transmitted by a wireless communication terminal of the moving object via a network server and executes the notification based on this wireless communication information (see, for example, unexamined Japanese patent application disclosure no. 2022-123691). In the vehicle driver assistance system described above, communication costs and communication load become high when wireless communication information is constantly transmitted. SUMMARY The aim of the present invention is to provide a vehicle driver assistance system with low communication costs and low communication load. According to the present invention, a vehicle assistance system comprises a vehicle assistance device mounted on a host vehicle and a server provided in a communication network. The server is configured to receive position information wirelessly transmitted via the communication network from a wireless communication terminal having a moving object and to transmit determination information to the vehicle assistance device via the communication network when the server determines, based on the position information, that a passage condition is met. The passage condition is a condition that the moving object passes at least one predetermined point in the direction of a predetermined intersection. The at least one predetermined point is a point set on a predetermined junction and located a predetermined distance from the predetermined intersection along the predetermined junction. The predetermined junction is a road that intersects with another road at the predetermined intersection. The destination information indicates that the moving object is passing at least one predetermined point on the predetermined branch in the direction of the predetermined intersection. The vehicle assistance system is configured to issue a notification in a first notification mode to inform an operator of the host vehicle of the presence of a target object when a notification condition is met. The notification condition is that the predetermined intersection indicated by the received destination information is a target intersection, and the predetermined branch indicated by the received destination information is a target branch. The vehicle assistance system is configured to issue a notification in a second notification mode, different from the first, when a target detection condition is met while the notification in the first notification mode is being issued. The target detection condition is that the target moving object is directly detected by an in-vehicle device of the host vehicle. The target intersection is an intersection located ahead in the direction of travel of the host vehicle. The target junction is a road that intersects the host vehicle's path at the target intersection. The target moving object is a moving object that moves towards the target intersection along the target junction. If communication between the server and the vehicle assistance system is continuous, communication costs and load increase. According to the vehicle assistance system of the present invention, when the server receives position information from the wireless communication terminal and the passage condition is met, it transmits the destination information to the vehicle assistance system. Furthermore, according to the vehicle assistance system of the present invention, when the vehicle assistance system receives the destination information from the server and the notification condition is met, it executes the notification. Therefore, according to the vehicle assistance system, it is possible to reduce communication costs and load. In the vehicle driver assistance system according to one aspect of the present invention The passage condition can be a condition that the moving object passes at least one predetermined point in the direction of the predetermined intersection, and that the speed of the moving object is a speed within a predetermined speed range. According to the vehicle assistance system according to this aspect of the present invention, it is possible to determine whether the determination information should be transmitted to the vehicle assistance device according to the speed of movement of the moving object. In the vehicle assistance system according to a further aspect of the present invention, the at least one predetermined point can be a point set such that the arrival time of a moving object is longer than the delay time. The arrival time of the moving object can be the time required for the moving object to reach the inters