# US 12,008,354 B2 · Update method of map data and map information system

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- Number: US 12,008,354 B2
- Document ID: US12008354B2
- Status: Granted
- Kind: B2
- Application number: 17/571,034
- Filed: 2022-01-07
- Published: 2022-07-14
- Granted: 2024-06-11
- Earliest claimed: 2021-01-12
- Assignees: Honda Motor Co., Ltd.
- Applicants: Honda Motor Co., Ltd.
- Inventors: Hidetoshi Chikamori; Kazumasa Nakamura; Hitoshi Konishi; Takuji Harayama; Tomoaki Masakawa; Naofumi Aso; Ryo Matsuzawa; Zhaoqi Wang
- Web page: https://patentgrep.com/patent/US12008354B2

## CPC

- G01C 21/3889: {Transmission of selected map data, e.g. depending on route}
- G06F 8/65: Updates (security arrangements therefor G06F21/57)
- G01C 21/3804: {Creation or updating of map data}
- G01C 21/3881: {Tile-based structures}
- G01C: MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F; radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effects, propagation time, of radio waves, analogous arrangements using other waves G01S)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

In an update method of map data executed by a map information system provided in a vehicle, wherein the map data includes multiple pieces of block data separated corresponding to blocks on a map and stored in a storage device of the map information system, the map information system decides priority orders of pieces of block data to be updated based on at least one of a position of an own vehicle, a route to a destination, and a passage history, communicates with a map server having a latest version of the map data and downloads update data of the pieces of block data to be updated from the map server in accordance with the priority order, and updates the pieces of block data stored in the storage device based on the downloaded update data.

## Claims

### Claim 1

An update method of map data executed by a map information system provided in a vehicle, wherein
the map data includes multiple pieces of block data separated so as to correspond to blocks on a map and stored in a storage device of the map information system, and
wherein the map information system
decides priority orders of pieces of block data to be updated based on at least one of a position of an own vehicle, a route to a destination, and a passage history,
communicates with a map server having a latest version of the map data and downloads update data of the pieces of block data to be updated from the map server in accordance with the priority order,
updates the pieces of block data stored in the storage device based on the downloaded update data, and
when, during download of a piece of block data, a corresponding block does not include the route to the destination and is positioned behind the own vehicle with respect to the direction of the own vehicle, the map information system cancels the download of the piece of block data that is being downloaded, the corresponding block being a block corresponding to the update data that is being downloaded.

### Claim 2 (depends on 1)

The update method of map data according to claim 1, wherein the map data is a high accuracy map including lane information.

### Claim 3 (depends on 2)

The update method of map data according to claim 2, wherein the map information system deletes, based on the passage history, pieces of block data corresponding to map regions in which a passage frequency is less than or equal to a prescribed determination value.

### Claim 4 (depends on 2)

The update method of map data according to claim 2, wherein the map information system deletes, based on the passage history, pieces of block data corresponding to map regions in which a passage frequency is less than or equal to a prescribed determination value and which do not include the route to the destination.

### Claim 5 (depends on 1)

The update method of map data according to claim 1, wherein each piece of block data includes version information, and
the map information system determines necessity of update based on the version information of the pieces of block data stored in the storage device and the version information of the pieces of block data stored in the map server and performs download from the map server when it is determined that the update is necessary.

### Claim 6

A map information system comprising:
a storage device that stores map data including multiple pieces of block data separated so as to correspond to blocks on a map; and
a map acquisition unit that decides priority orders of pieces of block data to be updated based on at least one of a position of an own vehicle, a route to a destination, and a passage history, communicates with a map server having a latest version of the map data, downloads latest pieces of block data from the map server in accordance with the priority orders, and updates the pieces of block data stored in the storage device based on the downloaded pieces of block data,
wherein when, during download of a piece of block data, a corresponding block does not include the route to the destination and is positioned behind the own vehicle with respect to the direction of the own vehicle, the map acquisition unit cancels the download of the piece of block data that is being downloaded, the corresponding block being a block corresponding to the update data that is being downloaded.