ISO 15622:2018 高度道路交通システム—アダプティブクルーズコントロールシステム—性能要件とテスト手順 | ページ 6

3.1

active brake control

function that causes application of the brake(s), not applied by the driver, in this case controlled by the ACC system

3.2

Adaptive Cruise Control

ACC

enhancement to conventional cruise control systems [see conventional cruise control (3.5) ], which allows the subject vehicle to follow a forward vehicle at an appropriate distance by controlling the engine and/or power train and potentially the brake

3.3

brake

part in which the forces opposing the movement of the vehicle develop

Note 1 to entry: It can be a friction brake (when the forces are generated by friction between two parts of the vehicle moving relatively to one another); an electrical brake (when the forces are generated by electro-magnetic action between two parts of the vehicle moving relatively but not in contact with one another); a fluid brake (when the forces are generated by the action of a fluid situated between two parts of the vehicle moving relatively to one another); an engine brake (when the forces are derived from an artificial increase in the braking action, transmitted to the wheels, of the engine).

Note 2 to entry: Definition according to ECE-R 13-H, except for the purposes of this document, transmission control devices are not considered as brakes.

3.4

clearance

distance from the forward vehicle's trailing surface to the subject vehicle's leading surface

3.5

conventional cruise control

system capable of controlling the speed of a vehicle as set by the driver

3.6

forward vehicle

vehicle in front of and moving in the same direction and travelling on the same roadway as the subject vehicle (3.11)

3.7

free-flowing traffic

smooth-flowing and heavy traffic excluding stop and go and emergency braking situations

3.8

time gap

τ

3.9

set speed

desired travel speed, set either by the driver or by some control system that is external to the ACC system

Note 1 to entry: The set speed is the maximum desired speed of the vehicle while under ACC control.

3.10

steady state

condition whereby the value of the described parameter does not change with respect to time, distance, etc.

3.11

subject vehicle

vehicle equipped with the ACC system in question and related to the topic of discussion

3.12

system states

one of several stages or phases of system operation

Note 1 to entry: See Figure 3.

3.12.1

ACC off state

phase in which direct access for activation of “ACC active state” is disabled

3.12.2

ACC stand-by state

phase in which there is no longitudinal control by ACC system and the system is ready for activation by the driver

3.12.3

ACC active state

phase in which the system controls the speed and/or clearance

3.12.4

ACC speed control state

phase in which the system controls the speed according to the set speed

3.12.5

ACC following control sub-state

phase in which the system controls the clearance to the target vehicle according to the selected time gap

3.12.6

FSRA hold state

phase in which the system is active during standstill

Note 1 to entry: Applied for FSRA-type systems only.

3.13

target vehicle

vehicle that the subject vehicle follows

3.14

stationary object

object in front of the subject vehicle which is stationary

3.15

slow moving object

object in front of the subject vehicle which is moving with less than MAX [1,0 m/s, 10 % of subject vehicle speed] in the direction of the centreline of the subject vehicle

3.16

Full Speed Range Adaptive Cruise Control

FSRA cruise control

class of adaptive cruise control systems (3.2) , which allows the subject vehicle to follow a forward vehicle at an appropriate distance by controlling the engine and/or power train and the brake down to standstill

3.17

Limited Speed Range Adaptive Cruise Control

LSRA cruise control

class of adaptive cruise control systems (3.2) , which allows the subject vehicle to follow a forward vehicle at an appropriate distance by controlling the engine and/or power train and the brake above a certain minimum velocity

3.18

in-vehicle device

manufacturer-integrated device that provides the ACC set-speed value without active communication to external devices