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All technical contents of this standard are mandatory.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 24545-2009 Requirement of speed limitation system for motor vehicles. The following main changes have been made with respect to GB/T 24545-2009 (the previous edition):
——the nature of this standard is changed from voluntary into mandatory;
——the name of this standard is changed to Requirements and test methods of speed limitation system for motor vehicles;
——the "Scope" is modified (see Clause 1);
——the “Normative references” is modified (see Clause 2);
——the “Terms and definitions” is modified (see Clause 3);
——the “General requirements” is modified (see Clause 4);
——the requirements for vehicles with the maximum speed limitation system are modified (see Clause 5);
——the requirements for vehicles with adjustable speed limitation system are modified (see Clause 6);
——Annex A is changed to Clause 7, "Test methods for vehicles with maximum speed limitation system", and some contents are modified (see Clause 7);
——Annex B is changed to Clause 8 "Test methods for vehicles with adjustable speed limitation system", and some contents are modified (see Clause 8).
The technical contents of this standard refer to the European Union directive UN Regulation No.89 Uniform provisions concerning speed limitation.
This standard was proposed by and is under the jurisdiction of the Ministry of Industry and Information Technology of the People's Republic of China.
The previous edition of this standard is as follows:
——GB/T 24545-2009.
Requirements and test methods of speed limitation system for motor vehicles
1 Scope
This standard specifies the terms and definitions and general requirements of speed limitation system for motor vehicles, as well as requirements and test methods for vehicles with maximum speed limitation system and adjustable speed limitation system.
It is applicable to:
——Maximum speed limitation device and adjustable speed limitation device.
——Classes M and N vehicles equipped with maximum speed limitation device or adjustable speed limitation device.
——Classes M and N vehicles with maximum vehicle speed limitation function or adjustable speed limitation function.
2 Normative references
The following referenced documents are indispensable for the application 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.
GB 4094 Symbols for controls, indicators and tell-tales of motor vehicles
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 - Plate and label
GB/T 28046.1 Road vehicles - Environmental conditions and testing for electrical and electronic equipment - Part 1: General
GB/T 28046.2 Road vehicles - Environmental conditions and testing for electrical and electronic equipment - Part 2: Electrical loads
GB/T 28046.3 Road vehicles - Environmental conditions and testing for electrical and electronic equipment - Part 3: Mechanical loads
GB/T 28046.4 Road vehicles - Environmental conditions and testing for electrical and electronic equipment - Part 4: Climatic loads
GB/T 28046.5 Road vehicles - Environmental conditions and testing for electrical and electronic equipment - Part 5: Chemical loads
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB 7258 and GB/T 15089 and the following apply.
3.1
speed limitation system
system for limiting the vehicle speed realized by controlling the energy supply of the vehicle power unit and the management of the vehicle or engine (or motor), including maximum speed limitation system and adjustable speed limitation system
3.2
maximum speed limitation system
system for ensuring that the vehicle speed does not exceed the set speed through the maximum speed limitation device or the maximum speed limitation function
3.3
adjustable speed limitation system
system for ensuring that the vehicle speed does not exceed an adjustable limit speed set by the driver through adjustable speed limitation device or adjustable speed limitation function
3.4
maximum speed limitation device
device installed to limit the vehicle speed to not be greater than the set speed by controlling the energy supply of the vehicle power unit or management of the engine (or motor)
3.5
maximum speed limitation function
function of limiting the vehicle speed to not be greater than the set speed by controlling the energy supply of the vehicle power unit or management of the vehicle or engine (or motor), which may be realized by the original device of the vehicle
3.6
adjustable speed limitation device
device installed to limit the vehicle speed to not be greater than the adjustable limit speed by controlling the energy supply of the vehicle power unit or management of the engine (or motor)
3.7
adjustable speed limitation function
function of limiting the vehicle speed to not be greater than the adjustable limit speed by controlling the energy supply of the vehicle power unit or management of the vehicle or engine (or motor), which may be realized by the original device of the vehicle
3.8
set speed, vset
maximum running speed of the vehicle set in the maximum speed limitation system
3.9
stabilized speed, vstab
average running speed when the maximum speed limitation system or adjustable speed limitation system functions and the vehicle is in a stable running state
3.10
maximum speed, vmax
maximum running speed reached by the vehicle in the first part of the speed-time curve of the maximum speed limitation test (see Figure 3)
3.11
adjustable limit speed, vadj
maximum running speed of the vehicle set by the driver independently in the adjustable speed limitation system and may be released at any time
4 General requirements
4.1 Speed limitation system
Where the vehicle is running normally, the necessary components of the speed limitation system shall function normally. The speed limitation system shall meet the requirements of this standard.
4.2 Requirements for maximum speed limitation device and adjustable speed limitation device
4.2.1 Environmental load
It shall meet the requirements for environmental load in GB/T 28046.1.
4.2.2 Electrical load
It shall meet the requirements for electrical load in GB/T 28046.2.
4.2.3 Mechanical load
It shall meet the requirements for mechanical load in GB/T 28046.3.
4.2.4 Climatic load
It shall meet the requirements for climatic load in GB/T 28046.4.
4.2.5 Chemical load
It shall meet the requirements for chemical load in GB/T 28046.5.
4.2.6 Electrical transient conduction
The test shall be carried out according to severity level IV in GB/T 21437.2-2008, and its functional state shall meet the requirements of Class A.
4.2.7 Electromagnetic radiation
It shall operate well in normal electromagnetic environment of the vehicle and meet the requirements of GB/T 17619.
4.3 Safety and durability
4.3.1 Safety
The failure of the speed limitation system does not affect the driver's control of the engine through the accelerator pedal.
4.3.2 Durability
4.3.2.1 The maximum speed limitation device simulates its movement on the vehicle to carry out durability test on the bench. Control system is provided by the manufacturer to keep the speed limitation device subjected to durability test according to the durability test cycle shown in Figure 1.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 Requirements for vehicles with maximum speed limitation system
6 Requirements for motor vehicles with adjustable speed limitation system
7 Test method of motor vehicles with maximum speed limitation system
8 Test method of motor vehicles with adjustable speed limitation system
9 Implementation date
