ISO 21750:2006 道路車両—タイヤの空気圧監視と組み合わせた安全性の向上 | ページ 6

3.1

tyre wheel assembly

assembly consisting of a wheel (rim and disc) fitted with a tyre, a valve, etc.

3.2

tyre

flexible component of the tyre wheel assembly made of rubber and reinforcing materials

Note 1 to entry: Inflating the tyre with compressed gas enables it to carry the wheel load as part of an axle load and to transmit longitudinal and transversal forces. In the unloaded condition, the inflated tyre is essentially toroidal.

3.3

normal tyre

tyre designed for use in an inflated state

Note 1 to entry: “Conventional tyre” under the SAE means is defined by the ETRTO Standards Manual as a synonym of “diagonal tyre” and should not be used in the sense of"usual, standard tyre".

3.4

spare unit

tyre wheel assembly intended to be exchanged for a tyre wheel assembly already fitted on the vehicle that has lost some functional efficiency

3.5

Spare Unit Substitutive Equipment

SUSE

equipment intended to maintain or restore, not replace, the basic tyre functions of a tyre in case of a tyre wheel assembly failure

3.6

extended mobility system

assembly of specified functionally dependent components including, but not limited to, a tyre and a flat tyre warning system, which together provide the specified performance granting “extended mobility” to a vehicle thus equipped

Note 1 to entry: A single component or several independent components, functionally interacting with other elements of the vehicle do not in and of themselves constitute an “extended mobility system”. In addition, the assembly of components, otherwise suitable to compose a system, but which do not completely follow the specifications of a “systems manager”, does not constitute an “extended mobility system".

3.7

Tyre Pressure Monitoring System

TPMS

any system fitted on a vehicle, able to evaluate the pressure of the tyres or the variation of the pressure over time and to transmit corresponding information to the user while the vehicle is running

3.8

Tyre Pressure Alerting System

TPAS

system and process of measuring the tyre inflation pressure and eventually internal temperature, or (a) parameter(s) that directly correlate(s) to the pressure and delivering an information to the driver that a tyre has reached a level of inflation pressure that requires a corrective action

Note 1 to entry: TPAS may also include a run-flat warning function.

3.9

Tyre Pressure Warning System

TPWS

TPAS also able to provide useful information, at least the actual relative tyre pressure condition of each tyre, to the driver

3.10

Tyre Leak Alerting System

TLAS

system and process for detecting that the inflation pressure of one of the tyres in service has significantly changed in comparison to the others and to the initial state, requiring a corrective action

3.11

Intelligent Tyre Pressure Management System

ITPMS

system which is able to monitor the pressure and the internal temperature of the tyre, to adapt the pressure by increasing or decreasing the actual pressure in dependence on the real service conditions and to restore the correct pressure in case of pressure loss

3.12

false information

information provided to the user which is not consistent with the system's specifications

3.13

learning phase

working condition where necessary values for TPMS/TLAS (data, parameter) are recognized, measured, and respectively verified to a sufficient statistical probability

Note 1 to entry: The learning phase can include active and passive sections. During the learning phase the alerting/warning sensibility increases from “zero” to target.

3.14

inflated mode

normal working state of a tyre, inflated at the cold inflation pressure recommended by the vehicle (or the tyre) manufacturer for the intended service

3.15

flat tyre running mode

state of a tyre, part of an extended mobility system operating at an inflation pressure lower than 70 kPa

3.16

cold tyre inflation pressure

tyre pressure at ambient temperature, in absence of any pressure build-up due to tyre usage

3.17

minimum cold tyre inflation pressure

minimum cold tyre inflation pressure, specified by the tyre standardization bodies for given service conditions

3.18

recommended cold tyre inflation pressure

P_rec

pressure recommended for each tyre position by the vehicle and/or the tyre manufacturer for the intended service conditions of the given vehicle

Note 1 to entry:P_rec is the same or higher than the minimum cold tyre inflation pressure.

3.19

set of recommended cold tyre inflation pressure

recommended cold tyre inflation pressure for the tyres of the front and the rear axle of a vehicle

3.20

pressure reserve

difference, for each tyre position, between the recommended cold tyre inflation pressure and the minimum cold tyre inflation pressure

3.21

normal load on a tyre

load applied on an individual tyre by distributing to each axle its share of “kerb mass”, “accessory mass” and the “normal occupant mass”

3.22

maximum vehicle load on a tyre

share of the maximum axle load allowed by the vehicle manufacturer which applies on an individual tyre

3.23

tyre load reserve

for a given tyre at a given pressure, the difference between the maximum load allowed by the tyre manufacturer’s standards and the maximum vehicle load on the tyre

3.24

warning

any indication to the driver to inform him that one element of the vehicle is no longer within the normal service conditions, and that a corrective action is recommended

3.25

alarm

any indication to the driver to inform him that one element of the vehicle is now in a situation where an immediate corrective action is necessary

3.26

nuisance status indication

justified status indication that occurs at a frequency that distracts or annoys the vehicle operator and which could cause the vehicle operator not to take action when necessary

3.27

false warning or alarm

anomaly of the system leading to an unjustified warning or alarm

3.28

tyre intended service conditions

maximum expected load, speed and camber of a tyre in service for a given vehicle

3.29

wheel fitted component

WFC

enclosed device that measures physical parameters and conveys information to (downlink) a central unit fitted in the car body

Note 1 to entry: A WFC may also be equipped with an uplink channel which could carry the pressure on demand inputs or elsewhere.

3.30

external car body fitted component

EFC

enclosed device mounted on the body structure of the vehicle outside of the passenger compartment or boot which supports specific features of a TPMS and exchange information with WFC and/or IFC

Note 1 to entry: EFC may perform signal processing.

3.31

internal car body fitted component

IFC

enclosed device mounted on the car body structure of the vehicle inside the passenger compartment or boot which supports specific features of a TPMS and exchanges information with WFC and/or EFC

Note 1 to entry: IFC may perform signal processing.

3.32

run-flat warning function

possible additional function for a TLAS allowing it to warn the driver in the case where the vehicle is fitted with an extended mobility system (see 3.6) and this system is in the extended mobility mode