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QC/T 1224-2025: Method for judging spring effect of commercial vehicle equipped with air suspension
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Method for judging spring effect of commercial vehicle equipped with air suspension
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QC/T 1224-2025
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Basic data | Standard ID | QC/T 1224-2025 (QC/T1224-2025) | | Description (Translated English) | Method for judging spring effect of commercial vehicle equipped with air suspension | | Sector / Industry | Automobile & Vehicle Industry Standard (Recommended) | | Classification of Chinese Standard | T04 | | Classification of International Standard | 43.020 | | Word Count Estimation | 14,192 | | Date of Issue | 2025-05-09 | | Date of Implementation | 2025-11-01 | | Issuing agency(ies) | Ministry of Industry and Information Technology of the People's Republic of China | QC/T 1224-2025: Method for judging spring effect of commercial vehicle equipped with air suspension
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/QCT1224-2025
Automobile Industry Standards of the People's Republic of China
Vibration reduction effect of commercial vehicles equipped with air suspension
Determination method
Method for judging spring effect of commercial vehicle equipped
with air suspension
Released on May 9, 2025
2025-11-01 Implementation
CCS T 04
ICS 43.020
Ministry of Industry and Information Technology of the People's Republic of China issued
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Determination of technical requirements 1
5 Natural frequency and damping ratio vehicle test method 2
Appendix A (Informative) Calculation results of air spring load ratio 4
Appendix B (Informative) Air Suspension Natural Frequency and Damping Ratio Test Results Record 5
Reference 6
Table of Contents
Preface
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.
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 and coordinated by the National Technical Committee for Standardization of Automotive Products (SAC/TC 114).
This document was drafted by. Dongfeng Commercial Vehicle Co., Ltd., China Automotive Technology and Research Center Co., Ltd., FAW Jiefang Automobile Co., Ltd.,
Beiqi Foton Motor Co., Ltd., Beijing Foton Daimler Automotive Co., Ltd., China National Heavy Duty Truck Group Co., Ltd., SAIC Hongyan Automobile
Co., Ltd., Shandong Luoxiang Automobile Manufacturing Co., Ltd., China Automotive Research Institute Automobile Inspection Center (Wuhan) Co., Ltd., China Automotive Engineering Research Institute Co., Ltd.
Co., Ltd., FAW Logistics Co., Ltd., Shaanxi Automobile Group Co., Ltd., China Automotive Research Institute Automobile Inspection Center (Tianjin) Co., Ltd., Dongfeng
Liuzhou Automobile Co., Ltd., Xiangyang Daan Automobile Testing Center Co., Ltd., Anhui Jianghuai Automobile Group Co., Ltd., European Automobile Manufacturers Association
Beijing Representative Office of the China Association for the Advancement of Electric Drive (Belgium), Jiangsu Huayong Composite Materials Co., Ltd., Yutong Bus Co., Ltd., and Xiamen Guochuang Center for Advanced Electric Drive
Technology Innovation Center.
The main drafters of this document are. Yuan Zhaohui, Li Yugang, Wang Li, Xiu Yongzhi, Li Zhong, Meng Guoping, Zhu Tong, Zhao Wentao, Liu Guangjian, Wang Bing, Liu Xiangyu,
Deng Gaopan, Na Guangxin, Sun Yan, Zhang Wenbo, Li Yongping, Zhan Xin, Li Zunyi, Zhang Yongsheng, Zhang Li, Fu Lingling, Fan Peibin, Li Qiang, Hai Chenguang, Tian Fugang,
Gao Jie, Xing Jie, Chang Fengwei, Yuan Dingli, and Li Jun.
Vibration reduction effect of commercial vehicles equipped with air suspension
Determination method
1 Scope
This document specifies the technical requirements for determining the vibration reduction effect of commercial vehicles equipped with air suspension, as well as the vehicle test methods for natural frequency and damping ratio.
This document is applicable to M2, M3, N2, N3 and O3, O4 vehicles with air suspension on the rear axle. Other vehicles shall refer to it for implementation.
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.
document.
GB 1589 External dimensions, axle loads and mass limits for motor vehicles, trailers and motor vehicle trains
GB/T 3730.2 Vocabulary and codes for road vehicle mass
GB/T 34591 Terminology for Commercial Vehicle Air Suspension
3 Terms and Definitions
The terms and definitions defined in GB 1589, GB/T 3730.2, GB/T 34591 and the following apply to this document.
3.1
Damping ratio
The ratio of the actual damping coefficient to the critical damping coefficient.
[Source. GB/T 2298-2010, 3.96]
3.2
sprung mass
The mass of the load above the elastic element of the suspension, that is, the mass of the load borne by the suspension.
[Source. GB/T 12549-2013, 6.2.2]
3.3
Air spring load ratio
The ratio of the mass carried by the air spring to the sprung mass in a suspension.
4 Determination of technical requirements
4.1 When all axles (or axle groups) of the vehicle are at the maximum allowable axle load, the vibration reduction effect of all rear axles equipped with air suspension on M2 and M3 vehicles
The requirements of 4.3, 4.4 and 4.6 shall be met. If the requirements are not met, the vehicle shall not be considered as being equipped with air suspension.
4.2 When all axles (or axle groups) of the vehicle are at the maximum permissible axle load, the rear axles of all N2, N3 and O3, O4 vehicles equipped with air suspension
The vibration reduction effect should meet the requirements of 4.3 to 4.6.If the requirements are not met, it is not considered to be equipped with air suspension.
4.3 When all axles (or axle groups) of the vehicle are at the maximum permissible axle load, the air spring load ratio shall not be less than 50%.
According to formula (1), for each axle group, the air spring load ratio of each axle should be calculated separately, and the air spring load ratio calculation should be recorded in Appendix A.
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