ISO/TS 23792-1:2023 高度道路交通システム — 高速道路運転手システム (MCS) — Part 1: フレームワークと一般要件 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 204, Intelligent transport systems.

Introduction

An automated driving system (ADS) needs to be designed with the capability to cope with various conditions, such as the driving environment, behaviour of other vehicles in the surroundings, traffic regulations, etc.

In addition, an ADS designed to operate on motorways can encounter various situations such as merging into the main lane of traffic, adjusting the speed according to congested or freely flowing traffic, overtaking other vehicles, or changing lanes when approaching an exit/lane closure.

For Level 3 automated driving, the ADS issues a request to the fallback-ready user (FRU) to take over driving tasks when it cannot respond to certain conditions/situations.

The ISO 23792 series identifies the performance requirements for an ADS based on its capability to respond to certain conditions and situations. The requirements are derived in order to reliably transfer the control between the human driver and ADS, and for safe operation by the ADS.

The ISO 23792 series focuses on the system functionalities, under the assumption that the FRU is available and responsive to system requests to take over driving tasks.

1 Scope

Motorway chauffeur systems (MCS) perform Level 3 automated driving^[1] on limited access motorways with the presence of a fallback-ready user (FRU). MCS can be implemented in various forms capable of responding to different driving scenarios. This document describes a framework of MCS including system characteristics, system states/transition conditions and system functions.

MCS are equipped with a basic set of functionalities to perform in-lane operation and can also be equipped with additional functionalities such as lane changing.

This document specifies requirements of the basic set of functionalities and test procedures to verify these requirements. The requirements include vehicle operation to perform the entire dynamic driving task (DDT)^[1] within the current lane of travel, to issue a request to intervene (RTI)^[1] before disengaging, and to extend operation and temporarily continue to perform the DDT after issuing an RTI.

This document describes one specific form of system engagement. Other forms are possible. These other system engagement forms, especially those provided in combination with other driving automation system features, are not within the scope of this document.

Requirements and test procedures for the additional functionalities are provided in other parts of the ISO 23792 series.

Means related to setting a destination and selecting a route to reach the destination are not within the scope of this document. This document applies to MCS installed in light vehicles.^[2]

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO/SAE PAS 22736 and the following apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

3.3

route

planned sequence of waypoints to reach a destination

Note 1 to entry: See Figure 1:

Figure 1 — Route

Key

1	route A
2	route B
3	route C
a	To destination.

3.4

path

combination of one or more neighbouring lanes in the same direction of travel along a given route

Note 1 to entry: See Figure 2:

Figure 2 — Path

Key

1	path A
2	path B

3.5

trajectory

sequence of locations that define the intended motion vector of the subject vehicle (SV) used as references for vehicle motion control

Note 1 to entry: The motion vector includes longitudinal position and/or speed, also lateral position and/or the vehicle’s orientation information.

Note 2 to entry: see Figure 3:

Figure 3 — Trajectory

Key

a	Trajectory.

Bibliography