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GB/T 44128-2024: Road vehicles - Braking threshold pressures for heavy commercial vehicle combinations with fully pneumatic braking systems - Test with roller brake tester
Status: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 44128-2024 | English | 279 |
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Road vehicles - Braking threshold pressures for heavy commercial vehicle combinations with fully pneumatic braking systems - Test with roller brake tester
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GB/T 44128-2024
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PDF similar to GB/T 44128-2024
Standard similar to GB/T 44128-2024 GB/T 44287 GB/T 45147 GB/T 44123 Basic data | Standard ID | GB/T 44128-2024 (GB/T44128-2024) | | Description (Translated English) | Road vehicles - Braking threshold pressures for heavy commercial vehicle combinations with fully pneumatic braking systems - Test with roller brake tester | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | T24 | | Classification of International Standard | 43.040.40 | | Word Count Estimation | 14,179 | | Date of Issue | 2024-05-28 | | Date of Implementation | 2024-09-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 44128-2024: Road vehicles - Braking threshold pressures for heavy commercial vehicle combinations with fully pneumatic braking systems - Test with roller brake tester
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 43:040:40
CCST24
National Standards of People's Republic of China
Road vehicles Heavy commercial train pneumatic brake systems
Braking start pressure roller brake test bench measurement method
brake tester
(ISO 20918:2007,MOD)
Released on 2024-05-28
2024-09-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Recommended value of system brake starting pressure 2
5 Test equipment requirements 2
6 Test methods 2
Appendix A (Informative) Structure Number Comparison Table 4
Appendix B (Informative) Roller Brake Test Bench Braking Start Pressure Test Report 5
Appendix C (Informative) Example of printout of the test results of the roller brake test bench measuring the brake start pressure 6
Foreword
This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents"
Drafting:
This document is modified from ISO 20918:2007 “Road vehicles, heavy commercial trains, pneumatic brake systems - brake start pressure roller brakes”:
"Measurement Methods for Dynamic Test Benches":
Compared with ISO 20918:2007, this document has many structural adjustments: The comparison table of structural number changes between the two documents is shown in
Appendix A:
The technical differences between this document and ISO 20918:2007 and their reasons are as follows:
--- Added the vehicle types applicable to the document (see Chapter 1) to clarify the vehicle types suitable for domestic use;
--- ISO 611 was replaced by the normative reference GB/T 5620 to adapt to my country's technical conditions and increase operability;
--- Added normative reference to GB/T 15089 to adapt to my country's technical conditions;
--- Changed the sign of the roller rotation resistance (see 3:1) because the universal standard symbol for force is F:
The following editorial changes were made to this document:
--- Changed the expression of scope (see Chapter 1) to conform to the expression of national standards;
--- Changed the selection of the initial brake pressure value of the right axle (see Appendix C): The value in the original ISO file was incorrect:
Please note that some of the contents of this document may involve patents: The issuing organization of this document does not assume the responsibility for identifying patents:
This document was proposed by the Ministry of Industry and Information Technology of the People's Republic of China:
This document is under the jurisdiction of the National Technical Committee on Automotive Standardization (SAC/TC114):
The drafting units of this document: Dongfeng Commercial Vehicle Co:, Ltd:, FAW Jiefang Automobile Co:, Ltd:, and Hande Automotive Products (Suzhou) Co:, Ltd:
The main drafters of this document are: Sun Jianjun, Xia Jianchao, He Fei, Liu Shaojun, Huang Zhe and Zhang Xiaoning:
Road vehicles Heavy commercial train pneumatic brake systems
Braking start pressure roller brake test bench measurement method
1 Scope
This document specifies the recommended braking start pressure of the pneumatic brake system of heavy commercial trains, the
The measurement method, recording and value taking of the braking start pressure of the train pneumatic brake system:
This document is applicable to the measurement of the brake start pressure of the pneumatic brake system of Category N and Category O vehicles specified in GB/T 15089:
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document:
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document:
GB/T 5620 Road vehicles - Terms and definitions for braking of motor vehicles and trailers (GB/T 5620-2020, ISO 611:
2003, IDT)
GB/T 15089 Classification of motor vehicles and trailers
ISO 21069-1 Roller brake test bench test method for brake systems of road vehicles with a maximum permissible gross mass of 3:5 tonnes or more
3 Terms and definitions
The terms and definitions defined in GB/T 5620 and the following apply to this document:
3:1
Rolling resistance
Fa
The resistance generated by the roller when the vehicle generates braking force or torque on the roller brake test bench:
3:2
Trailer control pressure trailerpressure
Pm
Pressure at the trailer control line connection:
3:3
Pc
The air pressure in the brake chamber of the brake system:
3:4
Pt
The trailer control pressure measured when the braking force or torque begins to increase beyond the rolling resistance:
Note: This pressure can only be measured during the pressurization process:
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