GB/T 12544-2012Measurement of maximum speed of motor vehicles (English PDF)

Foreword

This standard is drafted according to the rule given in GB/T 1.1-2009. This standard supersedes "Motor Vehicles - Maximum Speed - Test Method" (GB/T 12544-1990). Compared with GB/T 12544-1990, the main technical changes in this standard are as follows: -"Term and Definition" (Chapter 3) is added; - Test conditions are modified, thereof, "vehicle conditions" (4.1), "measurement parameters and their units and accuracy" (4.2), "road characteristics" (4.3), "atmospheric conditions" (4.4) and "test mass and load distribution of vehicle" (4.5) are added; - The double-direction test method on straight road (5.2.1) is modified, and the test frequency is changed to "the number of test in each direction is not less than once" from "once in both direction"; - "Single-direction test" (5.2.2) is added; - "Maximum speed on ring road" (5.3) is added and the correction factor of ring road is introduced; - "Specification for Determination of Correction Factor for Ring Road" (Appendix A) and "Calculation Formula for Air Density" (Appendix B) are added. Technical contents of this standard are prepared by reference to "Uniform Provisions Concerning the Approval of Motor Vehicles with Regard to the Measurement of the Maximum Speed". Compared with ECE R68.1997, the main changes in this standard are as follows: - Some management contents of certification application procedure are cancelled; - The notice of vehicle type certification is cancelled. - The arrangement of certification mark is cancelled; - Relevant contents of production conformity management are cancelled. This standard is proposed by Ministry of Industry and Information Technology of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee on Automobiles of Standardization Administration of China (SAC/TC 114). Drafting organizations of this standard. China Automotive Technology & Research Center, Hainan Tropical Automobile Test Co., Ltd., SAIC Motor Passenger Vehicle Company, Tianjin FAW Toyota Motor Co., Ltd., Beiqi Foton Motor Co., Ltd., Dongfeng Peugeot Citroen Automobile Company Ltd., Zhengzhou Yutong Bus Co., Ltd., China Automotive Engineering Research Institute Co., Ltd., Dongfeng Nissan Passenger Technology Center and Hanyang Special Purpose Vehicle Institute. Chief drafting staff of this standard. Wang Xueping, Mai Ruili, Xie Jinzhong, Gao Yue, Wang Huaiguo, Gong Hongbing, Zhang Shanqian, Tao Chenjun, Bao Jingyu, Zhang Zhe, Shi Jianhua, Liu Gang and Wu Yueling. The previous editions of the standard superseded by this standard are as follows: - GB/T 1334-1977; - GB/T 12544-1990. Measurement of Maximum Speed of Motor Vehicles

1 Scope

GB/T 12544-2012 is the Chinese national standard on measurement of maximum speed of motor vehicles, in the field of road vehicles engineering. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 31 December 2012 by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China, and has been in force since 1 July 2013. Classification: ICS 43.020, CCS T41. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This standard specifies the measurement of maximum speed of motor vehicles. This standard is applicable to all motor vehicles except electric vehicles. Combination vehicles may also refer to the provisions of this standard.

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 normative document (including any amendments) applies

GB/T 12428 Laden Mass Calculating Method for Buses

GB/T 12534 Motor Vehicles - General Rules of Road Test Method

3 Term and Definition

For the purposes of this document, the following tem and definition apply.

3.1 Maximum speed The maximum stable speed the vehicle can maintain according to the specified test method.

5 Test Methods

5.1 Test vehicle preparation Prior to the test, all vehicle parts which will affect the test result shall be preheated to meet the stable temperature condition designated by the manufacturer. The gear is adjusted to make the vehicle reach its maximum stable speed.