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GB/T 12674-2024: Motor vehicles, trailers and combination vehicles mass parameters measurement method Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 12674: Historical versions
Similar standardsGB/T 12674-2024: Motor vehicles, trailers and combination vehicles mass parameters measurement method---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/GBT12674-2024 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 43.020 CCS T 04 GB/T 12674-2024 Replacing GB/T 12674-1990 Motor vehicles, trailers and combination vehicles mass parameters measurement method ISSUED ON: MAY 28, 2024 IMPLEMENTED ON: SEPTEMBER 01, 2024 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 5 2 Normative references ... 5 3 Terms and definitions ... 5 4 Measuring instruments ... 5 5 Measurement requirements ... 5 6 Measurement methods ... 6 7 Measurement records ... 9 Annex A (informative) Measurement records ... 10ForewordThis document was drafted in accordance with the provisions of GB/T 1.1-2020 “Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents”. This document replaces GB/T 12674-1990 “Motor vehicles - Weight parameters - Measuring method”. Compared with GB/T 12674-1990, in addition to structural adjustments and editorial changes, the main technical changes are as follows: - MODIFY the scope of application (see Clause 1 of this document, Clause 1 of the 1990 edition); - MODIFY the requirements for measuring instruments (see Clause 4 of this document, 3.1 of the 1990 edition); - ADD the requirements for measuring sites (see 5.1 of this document); - MODIFY the requirements for vehicle preparation (see 5.2 of this document, 3.2, 3.3, 3.4, 3.5 of the 1990 edition); - ADD the general principles of measurement methods (see 6.1 of this document); - MODIFY the measurement methods and calculation of measurement results (see 6.2.1 of this document, Clauses 4 and 5 of the 1990 edition); - ADD the measurements under special conditions (see 6.2.2 of this document); - ADD the measurement method for class O trailers (see 6.3 of this document). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing authority of this document shall not be held responsible for identifying any or all such patent rights. This document was proposed by Ministry of Industry and Information Technology of the People’s Republic of China. This document shall be under the jurisdiction of National Technical Committee of Auto Standardization (SAC/TC 114). Drafting organizations of this document: China Automotive Technology & Research Center Co., Ltd., CATARC Automotive Research and Inspection Center (Ningbo) Co., Ltd., SAIC-GM-Wuling Automobile Co., Ltd., Xiangyang Da’an Automobile Test Center Co., Ltd., CATARC Automotive Research and Inspection Center (Wuhan) Co., Ltd., Anhui Jianghuai Automobile Group Co., Ltd. Motor vehicles, trailers and combination vehicles mass parameters measurement method1 ScopeThis document specifies the measuring instruments, measurement requirements, measurement methods and measurement records of mass parameters of motor vehicles, trailers and combination vehicles. This document applies to the measurement of mass parameters of class M, class N motor vehicles and class O trailers and combination vehicles, and other types of vehicles may use this document for reference.2 Normative referencesThe 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/T 3730.1 Terms and definitions of motor vehicles, trailers and combination vehicle - Part 1: Types3 Terms and definitionsFor the purpose of this document, the terms and definitions defined in GB/T 3730.1 apply.4 Measuring instrumentsThe requirements for measurement parameters are shown in Table 1.5 Measurement requirements5.1 Measurement site The measurement site shall be flat, clean, dry and hard, with a lateral and longitudinal slope of no more than 1 %. 5.2 Vehicle preparation Determine the vehicle’s load state according to the measurement requirements. When the vehicle needs to be loaded with a simulated load, the load shall be evenly distributed or located at the position specified by the manufacturer; the load shall be firmly fixed and shall not shake or bounce during the test; its mass shall not change due to moisture, loss and other conditions to ensure that the size and distribution of the load mass remain unchanged. Under the test load state, the cold-state inflation pressure of the tires of the test vehicle shall comply with the manufacturer’s regulations. The vehicle shall be kept clean, and all vehicle assemblies, components and auxiliary equipment (including on-board tools and spare tires) shall be fully equipped as specified by the manufacturer and installed in the specified position (adjusted to the position required by the manufacturer). For assembly components with adjustable positions (such as lifting axles and adjustable air suspensions), they shall be adjusted to a state suitable for the load and recorded.6 Measurement methods6.1 General 6.1.1 Drive the vehicle onto the measuring instrument from both the forward and reverse directions for measurement, once in each direction, and take the average value of the two measurements as the final measurement result. The result shall be rounded to an integer. 6.1.2 For articulated vehicles and vehicles equipped with lifting bridges or other special structures (which have a significant impact on the vehicle load distribution under different conditions), the measurement method in 6.2.1 shall apply only, and the special structural state of the vehicle shall be recorded during measurement. 6.2 Class M and class N motor vehicles and combination vehicles 6.2.1 Conventional measurement Drive the vehicle onto the axle (wheel) load meter’s load carrier at a low speed, with the tires in a straight-line driving state. After the vehicle stops, turn off the engine (the electric vehicle is in a power-off state), put the vehicle in neutral, release the brake, and record the axle load or wheel load of the vehicle. When using an axle load meter for measurement, the total mass of the vehicle, m, is calculated according to formula (1); when using a wheel load meter for measurement, turn off the engine (the electric vehicle is in a power-off state), put the vehicle in neutral, release the brake, and measure and record the axle load of the first axle; then continue to move forward so that the first two axles of the vehicle are on the axle load meter’s load carrier, measure the sum of the masses of the first two axles, and subtract them to obtain the axle load of the second axle; according to the above method, for each additional axle, record the sum of the masses displayed by the axle load meter and calculate the axle load of the axle. The measured axle load, mi, is calculated according to formula (3), and the total mass, m, is calculated according to formula (1). where: m’i - the sum of the masses of the vehicle measured from the nth axle to the ith axle, in kilograms (kg); m’i-1 - the sum of the masses of the vehicle measured from the nth axle to the i-1th axle, in kilograms (kg). NOTE: n is determined according to the actual measurement situation. If the first axle is on the load carrier, n is 1; if the first axle is out of the load carrier, n is 2, and so on. 6.3 Class O trailers The measurement shall be assisted by a towing vehicle. The structure and height of the connection device used by the towing vehicle shall match the trailer being measured. According to 6.2, measure the axle load of the trailer, the total mass of the combination vehicle and the total mass of the towing vehicle in the combination vehicle state. Record the axle load of the trailer, and the total mass of the trailer, mtrailer, is calculated according to formula (4); the load mass of the trailer saddle, msaddle, is calculated according to formula (5). mtrailer = mcombination vehicle - mtowing vehicle ... (4) where: mtrailer - the total mass of the trailer, in kilograms (kg); mcombination vehicle - the total mass of the combination vehicle, in kilograms (kg); mtowing vehicle - the total mass of the towing vehicle, in kilograms (kg). msaddle = mtrailer - mitotal ... (5) where: msaddle - the load mass of the trailer saddle, in kilograms (kg); ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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