JP-2026075952-A - On-vehicle device

Abstract

[Problem] To provide a technology that prevents vehicles from entering underpasses that are prone to flooding without using infrastructure facilities. [Solution] Memory 50 stores the first location information of the underpass. Communication circuit 30 is capable of receiving disaster warning data. Positioning circuit 20 determines the second location information of the vehicle. Processing circuit 40 is connected to memory 50, communication circuit 30, and positioning circuit 20. Output circuit 60 outputs the result of processing in memory 50. Here, if the received disaster warning data indicates the possibility of flooding of the underpass, and the second location information enters the warning area containing the first location information, processing circuit 40 outputs a warning to output circuit 60, and output circuit 60 outputs a warning as a result of processing. [Selection Diagram] Figure 2

Inventors

• 藤井　速人
• 中岡 謙
• 山崎 正純
• 後藤 章二

Assignees

• パナソニックオートモーティブシステムズ株式会社

Dates

Publication Date

20260511

Application Date

20241023

Claims (5)

1. An in-vehicle device that can be mounted on a vehicle, A memory that stores the first position information of the underpass, A communication circuit capable of receiving disaster and danger notification data, A positioning circuit for determining the second position information of the vehicle, The memory, the communication circuit, and the processing circuit connected to the positioning circuit, The system includes an output circuit that outputs the result of the processing in the processing circuit, When the processing circuit receives the disaster warning data indicating the possibility of flooding in the underpass, and the second location information enters the warning area including the first location information, it outputs a warning to the output circuit. The output circuit is an in-vehicle device that outputs the warning as a result of the processing.
2. The second location information includes latitude, longitude, and altitude information. The positioning circuit sequentially determines the second position information as time progresses. The in-vehicle device according to claim 1, wherein the processing circuit, based on the second position information obtained sequentially, detects a downward slope greater than a predetermined incline, and then, if it detects an upward slope within a predetermined range from the downward slope, it registers the section from the start position of the downward slope to the end position of the upward slope as the first position information of the underpass in the memory.
3. When defining an underpass corresponding to the first position information stored in the memory as the first underpass, When the processing circuit detects a second underpass that overlaps with at least a portion of the first underpass, it updates the first underpass using the second underpass. The in-vehicle device according to claim 2, wherein the memory stores the updated first position information of the first underpass.
4. The in-vehicle device according to claim 1, wherein the first location information stored in the memory is generated based on a hazard map.
5. The aforementioned communication circuit is capable of receiving the disaster and danger notification data via the Quasi-Zenith Satellite System. The positioning circuit determines the second position information using the Global Navigation Satellite System, The vehicle-mounted device according to any one of claims 1 to 3, wherein the disaster warning data indicates the possibility of flooding of the underpass when the disaster warning data indicates weather, flood, typhoon, or tsunami.

Description

This disclosure relates to in-vehicle devices, and more particularly to in-vehicle devices that can be mounted in a vehicle. The idle stop function shuts off the engine when the vehicle is temporarily stopped, as a measure to prevent global warming or improve fuel efficiency. However, if the engine stops due to heavy rain or other reasons causing road flooding and high water levels, engine malfunction may occur, making it impossible to restart. To avoid this, the idle stop function is deactivated based on weather warnings and hazard maps (see, for example, Patent Document 1). Japanese Patent Publication No. 2021-167588 Figures 1(a) and 1(b) show the structure of the underpass.This figure shows the configuration of the in-vehicle device according to this embodiment.This figure shows an overview of the processing in the processing circuit shown in Figure 2.This figure shows an overview of another process in the processing circuit shown in Figure 2.Figure 2 is a flowchart showing the procedure for registering an underpass using the in-vehicle device.Figure 2 is a flowchart showing the procedure for updating underpasses using an on-board device.Figure 2 is a flowchart showing the procedure for outputting warnings by the in-vehicle device. Before describing this disclosure in detail, an overview is provided. The embodiment of this disclosure relates to an in-vehicle device that is mounted on a vehicle and warns of the presence of underpasses that may be prone to flooding. In particular, the device warns the driver of entering an underpass during heavy rain without relying on infrastructure installed on the road. The device is equipped with a GNSS (Global Navigation Satellite System) positioning function and registers roads with a recessed shape as underpasses based on the positioning information. The device also has a QZSS (Quasi-Zenith Satellite System) communication function and receives disaster warning data. If the disaster warning data indicates heavy rain such as a typhoon, and the current location information approaches a registered underpass, the device outputs a warning because there is a possibility that the vehicle may enter an underpass prone to flooding. Figures 1(a) and 1(b) show the structure of the underpass 14. Figure 1(a) is a top view showing the first road 10a extending horizontally and the second road 10b extending vertically. The first road 10a and the second road 10b intersect at the overpass intersection 12. Figure 1(b) shows a cross-sectional view of A-A' in Figure 1(a). At the overpass intersection 12, the first road 10a includes the underpass 14. The underpass 14 has a sunken shape and passes under the second road 10b. Therefore, vehicles (not shown) traveling on the first road 10a towards the overpass intersection 12 descend into the underpass 14 and then ascend again. Since the underpass 14 is lower than the surrounding ground, it may be flooded during heavy rain. This technology is applicable not only to underpasses 14 but also to roads that are lower than the surrounding ground. Figure 2 shows the configuration of the in-vehicle unit 100. The in-vehicle unit 100 can be mounted on a vehicle (not shown). The in-vehicle unit 100 includes a positioning circuit 20, a communication circuit 30, a processing circuit 40, a memory 50, and an output circuit 60. The in-vehicle unit 100 does not, for example, have a navigation function. The positioning circuit 20 receives signals from satellites of the Global Navigation Satellite System (GNSS). Based on the received signals, the positioning circuit 20 determines the vehicle's position. Since known techniques can be used for positioning, a detailed explanation is omitted here. The vehicle's position information includes, for example, latitude, longitude, and altitude. The positioning circuit 20 sequentially determines the position information as time progresses. The positioning circuit 20 outputs the position information to the processing circuit 40. The communication circuit 30 communicates with the Michibiki satellite of the Quasi-Zenith Satellite System (QZSS) and can receive disaster warning data from the Michibiki satellite. The disaster warning data includes disaster information issued by disaster prevention agencies regarding earthquakes or tsunamis. The disaster information includes information on the type of disaster and information on the affected area. The types of disasters include earthquake early warnings, epicenter, seismic intensity, tsunamis, volcanoes, ashfall, weather, floods, and typhoons. The types of disasters may also include special heavy rain warnings and record-breaking short-term heavy rain information. The affected area may be indicated by a division such as Shibuya Ward or Tokyo, or by latitude and longitude. The communication circuit 30 outputs the received disaster warning data to the processing circuit 40. Note that the positioning circuit 20 and the communication circuit 30 may be configured as a single unit. The