ISO 24195:2022

INTERNATIONAL ISO
STANDARD 24195
First edition
2022-03
Road vehicles — Vocabulary and
characteristics for engineering of
starting devices
Véhicules routiers — Vocabulaire et caractéristiques pour l'ingénierie
des équipements d'allumage
Reference number
© ISO 2022
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General characteristics of the starter motor . 5
4.1 General . 5
4.2 Starter motor components . . 5
4.3 Starter motor functions . . 6
4.4 Starting parameters . 6
5 Special characteristics of the starter motor . 7
5.1 General . 7
5.2 Magnetic field . 7
5.3 Starting performance . 8
5.4 Energy consumption . 9
Bibliography .10
iii
Foreword
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This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 32,
Electrical and electronic components and general system aspects.
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iv
Introduction
This document harmonizes key terms and their definitions in the form of basic technical words and
simple explanations, because third parties involved in starter motor testing and start/stop systems
are spreading to various regions. The purpose is to guarantee an efficient and effective communication
throughout development projects within and among engineering organizations and related institutions.
In practice, many inefficiencies have been observed due to unclear or ambiguous usage of engineering
terms and missing knowledge about application to various starter motor development and testing. This
document is meant to preserve the essential knowledge of best practices, which rely on undocumented
usage of terms. With these terms and definitions, starter motor engineers as well as newcomers are
able to refer to this vocabulary framework when working together on starter motor development and
testing projects in an international environment.
v
INTERNATIONAL STANDARD ISO 24195:2022(E)
Road vehicles — Vocabulary and characteristics for
engineering of starting devices
1 Scope
This document includes common definitions for terms and their interdependencies related to starting
devices as well as describes their general and specific characteristics.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
armature
rotating assembly of the electric machine part of the starter motor
3.2
battery
electrical energy source connected to the starter motor
3.3
battery open circuit voltage
voltage at the battery (3.2) terminals (3.40) without electrical load
3.4
battery voltage
voltage between the battery (3.2) terminals (3.40)
3.5
cranking
condition in which the starter motor rotates the internal combustion engine (ICE) (3.17)
[SOURCE: ISO 20574:2019, 3.16, modified — "engine" has been replaced by internal combustion engine.]
3.6
cranking time
time period where the starter motor drives the internal combustion engine (ICE) (3.17) until a significant
rotational frequency change, caused by the first ignition (3.13), can be observed
3.7
crankshaft
shaft of the internal combustion engine (ICE) (3.17), which is connected to the ring gear (3.31)
3.8
direct starter motor
starter motor type in which the pinion (3.27) is driven at the same rotational frequency as the armature
(3.1)
3.9
driveshaft
shaft of the starter motor, which supports and drives the overrunning (3.23) clutch and the pinion (3.27)
3.10
engagement lever
fork lever
lever to move the pinion (3.27)
3.11
engine speed
rotational frequency of the crankshaft (3.7)
3.12
excitation winding
field winding
winding that carries an exciting current to create an electromagnet
3.13
first ignition
initial ignition of the internal combustion engine (ICE) (3.17) while the starter motor is cranking (3.4)
the ICE
3.14
helical spline
spline that transfers torque and axial load from the drive shaft to the pinion (3.27)
3.15
idle speed
rotational frequency of the internal combustion engine (ICE) (3.17) when the accelerator is not pushed
3.16
inrush current
maximum current when the starter motor is activated
3.17
internal combustion engine
ICE
engine, which generates motive power by the burning of a fuel-air mixture by means of a crank
mechanism
3.18
lock current
stall current
current which is drawn by the starter motor when the pinion (3.27) is locked (no rotation)
3.19
lock torque
stall torque
torque of the starter motor at the pinion (3.27) with the armature (3.1) shaft locked (no rotation)
[SOURCE: ISO 8856:2014, 2.1, modified — The term "stall torque" has been added and Note 1 to e
...