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GB 24545-2019 PDF in English


GB 24545-2019 (GB24545-2019) PDF English
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GB 24545-2019: PDF in English

GB 24545-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.30
T 26
Replacing GB/T 24545-2009
Requirements and Test Methods of Speed Limitation
System for Motor Vehicles
ISSUED ON: OCTOBER 14, 2019
IMPLEMENTED ON: JULY 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Terms and Definitions ... 6 
4 General Requirements ... 8 
5 Requirements of Motor Vehicles with Maximum Speed Limitation System ... 9 
6 Requirements of Motor Vehicles with Adjustable Speed Limitation System 11 
7 Test Methods of Motor Vehicles with Maximum Speed Limitation System .. 12 
8 Test Methods of Motor Vehicles with Adjustable Speed Limitation System . 15 
9 Date of Implementation ... 17 
Requirements and Test Methods of Speed Limitation
System for Motor Vehicles
1 Scope
This Standard stipulates the terms and definitions, and general requirements of speed
limitation system for motor vehicles; the requirements and test methods for motor
vehicles with maximum speed limitation system and motor vehicles with adjustable
speed limitation system.
This Standard is applicable to:
---Maximum speed limitation device and adjustable sped limitation device.
---Type-M and Type-N vehicles equipped with maximum speed limitation device
or adjustable speed limitation device.
---Type-M and Type-N vehicles equipped with maximum speed limitation function
or adjustable speed limitation function.
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB 4094 Motor Vehicles - Symbols for Controls, Indicators and Tell-tales;
GB 7258 Technical Specifications for Safety of Power-driven Vehicles Operating on
Roads;
GB/T 12534 Motor Vehicles - General Rules of Road Test Method;
GB/T 15089 Classification of Power-driven Vehicles and Trailers;
GB/T 17619 Limits and Methods of Testing for Immunity of Electrical/electronic Sub-
assemblies in Vehicles to Electromagnetic Radiation;
GB/T 21437.2-2008 Road Vehicles - Electrical Disturbances from Conduction and
Coupling - Part 2: Electrical Transient Conduction along Supply Lines Only;
GB/T 25978 Road Vehicle - Plates and Label;
Maximum speed limitation function refers to a function which limits the speed of a
motor vehicle under the set speed through the control of vehicle power plant’s power
supply, vehicle or engine (or electric motor) management. This function may be
implemented by a motor vehicle’s original device.
3.6 Adjustable Speed Limitation Device
Adjustable speed limitation device refers to a device which is installed to limit the speed
of a motor vehicle under the adjustable limit speed through the control of vehicle power
plant’s power supply, or engine (or electric motor) management.
3.7 Adjustable Speed Limitation Function
Adjustable speed limitation function refers to a function which limits the speed of a
motor vehicle under the adjustable limit speed through the control of vehicle power
plant’s power supply, vehicle or engine (or electric motor) management. This function
may be implemented by a motor vehicle’s original device.
3.8 Set Speed
Set speed refers to a motor vehicle’s maximum driving speed, which is set up in the
maximum speed limitation system.
3.9 Stabilized Speed
Stabilized speed refers to an average driving speed when the maximum speed
limitation system or the adjustable speed limitation system plays its role, and when a
motor vehicle is in a stable driving state.
3.10 Maximum Speed
Maximum speed refers to the maximum driving speed that a motor vehicle reaches in
the first part of the speed-time curve (see Figure 3) of maximum speed limitation test.
3.11 Adjustable Limit Speed
Adjustable limit speed refers to the maximum driving speed independently set up by
the driver in the adjustable speed limitation system. In addition, it can be unset at any
time.
set speed will not be temporarily or permanently raised or deleted under any
circumstances of operation.
5.2 The maximum speed limitation system shall prevent from unauthorized and
arbitrary adjustment, or, break off the power supply to unauthorized and arbitrary
adjustment.
5.3 It is not allowed to implement the maximum speed limitation function through
service braking. When the maximum speed limitation system has already limited power
supply to the power plant to the minimum, if the speed still exceeds the set speed, the
driver may adopt other deceleration measures.
5.4 When a motor vehicle is running at the set speed , the maximum speed
limitation system shall guarantee that even if the operation of acceleration is adopted,
the vehicle’s running speed will not be affected.
5.5 The maximum speed limitation system is not allowed to affect the normal operation
of acceleration pedal when shifting gears.
5.6 In normal driving, in terms of the driver’s operation of all the accelerators within an
attainable range, the maximum speed limitation system’s functions shall all be valid.
5.7 Within an easily visible range from the driver’s position, a maximum speed
limitation sign shall be pasted; characters on the sign shall be clear and distinguishable.
The maximum speed limitation sign shall comply with the stipulations in GB/T 25978.
Meanwhile, instruction of vehicle’s set speed value shall be added to the instructions
for use.
5.8 When a motor vehicle’s speed exceeds the set speed, alerting signals shall be sent
to the driver in the form of visual signal and auditory signal. Auditory signal shall be
distinct and easily identifiable to the driver. Visual signal device shall satisfy the
following requirements:
a) It shall be guaranteed that visual signal is identifiable to the driver in a
corresponding position. This corresponding position shall be: when the driver
is in the driving position, after certain adjustment in accordance with the
manufacturer’s instructions for use, a position that allows free activity of the
driver under the protection of the constraint system.
b) Speed limitation signal sign is shown in Figure 2. It shall comply with relevant
stipulations in GB 4094.
c) It shall be yellow or amber.
d) After a motor vehicle is power on, the visual signal device shall have self-
step length of not more than 10 km/h.
6.5.2 The driver may set up Vadj through operation of the device.
6.6 Initiate or Cancel Adjustable Speed Limitation Function
6.6.1 Adjustable speed limitation function shall be able to be initiated or cancelled
under the conditions stipulated by the manufacturer.
6.6.2 When engine is shut down, the adjustable speed limitation function shall be
automatically cancelled.
6.6.3 When the adjustable speed limitation function is initiated, the initial set Vadj value
shall be not lower than the current running speed.
7 Test Methods of Motor Vehicles with Maximum Speed
Limitation System
7.1 Circumstances Where Test is Unnecessary
Motor vehicles whose maximum running speed is lower than the set speed Vset can be
excused from the tests below.
7.2 Optional Road Test or Dynamometer Test
It is allowed to choose road test or dynamometer test. When the result of dynamometer
test is objectionable, road test shall be conducted; the result of road test shall be
subject to.
7.3 Road Test
7.3.1 Preparation of motor vehicles
7.3.1.1 Tire inflation pressure shall comply with the manufacturer’s requirements.
7.3.1.2 Motor vehicles shall be no-load.
7.3.2 Road
7.3.2.1 Road shall be suitable for vehicles to maintain at a stable speed. The surface
of road shall be flat. Road gradient shall be not more than 2%; road gradient variation
shall be not more than 1%.
7.3.2.2 The surface of road shall be dry.
7.3.3 Ambient weather conditions
7.4.1 Features of dynamometer test
The equivalent inertia of a motor vehicle’s mass shall be simulated through chassis
dynamometer. The accuracy shall be ± 10%; the deviation of speed test shall be not
more than ± 1%; the time interval of sampling shall be less than 0.1 s.
7.4.2 Acceleration test
7.4.2.1 In the test, braking work shall be set up to be consistent with vehicle’s running
resistance at a certain test speed. Such braking work may be obtained through
calculation; the accuracy shall be set up as ± 10%. The braking work may also be set
up as 0.4 Pmax (Pmax signifies the maximum power of engine). Start from (Vset  10 km/h);
press the acceleration pedal to the floor; conduct full throttle acceleration. After vehicle
speed becomes stable, the operation of pressing the acceleration pedal to the floor
shall at least be maintained for 20 s. When the speed limitation system takes effect,
record the transient speed value, so as to draw a speed-time curve graph.
7.4.2.2 The test shall satisfy the requirements in 7.3.5.2.
7.4.3 Stable speed test
7.4.3.1 Place test vehicle on a chassis dynamometer. The power absorbed by the
chassis dynamometer shall gradually decrease from Pmax to 0.2 Pmax. Within this power
variation range, record the transient speed value. The test shall be conducted for 5
times in total.
7.4.3.2 The test shall satisfy the requirements in 7.3.7.2.
8 Test Methods of Motor Vehicles with Adjustable
Speed Limitation System
8.1 Test Conditions
Test conditions shall comply with the requirements in 7.3.1 ~ 7.3.4.
8.2 Alert Test when Speed Exceeds Vadj
8.2.1 When speed is (Vadj  10 km/h), press the acceleration pedal to the floor, so that
the speed exceeds Vadj.
8.2.2 Speed shall at least reach (Vadj + 10 km/h); this speed shall at least be maintained
for 30 s.
8.2.3 In the test, record the transient speed value; speed test deviation shall be not
more than ± 1%; the time interval of sampling shall be less than 0.1 s.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.