GB/T 43404-2023 English PDF
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GB/T 43404-2023: Road load for light-duty vehicles - Reproduction on chassis dynamometer
---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/GBT43404-2023GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 43.020 CCS T 04 Road Load for Light-duty Vehicles - Reproduction on Chassis Dynamometer (ISO 10521-2:2006, Road Vehicles - Road Load - Part 2: Reproduction on Chassis Dynamometer, MOD) ISSUED ON: NOVEMBER 27, 2023 IMPLEMENTED ON: JUNE 1, 2024 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3 1 Scope ... 6 2 Normative References ... 6 3 Terms and Definitions ... 6 4 Requirements for Instruments and Equipment ... 8 5 Test Preparation ... 8 6 Load Setting of Chassis Dynamometer ... 10 Appendix A (normative) Calculation of Simulated Road Load on Chassis Dynamometer ... 16 Appendix B (normative) Adjustment of Chassis Dynamometer Setting Load ... 19 Road Load for Light-duty Vehicles - Reproduction on Chassis Dynamometer1 Scope
This document specifies the method for carrying out road load reproduction of vehicles on chassis dynamometer. This document is applicable to vehicles with a maximum design total mass not exceeding 3,500 kg. Category M1, M2 and N2 vehicles with a maximum design total mass exceeding 3,500 kg, but not exceeding 4,500 kg, may take this as a reference. The provisions for setting the chassis dynamometer load by the taxiing method described in this document are applicable to the setting of the test vehicle road load determined by the taxing method or the wind tunnel method. The provisions for setting the chassis dynamometer load by the torque meter method described in this document are applicable to the setting of the test vehicle running resistance determined by the torque meter method.2 Normative References
The contents of the following documents constitute indispensable clauses of this document through the normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 3730.1 Terms and Definitions of Motor Vehicles, Trailers and Combination Vehicle - Part 1: Types GB/T 15089 Classification of Power-driven Vehicles and Trailers GB 18352.6 Limits and Measurement Methods for Emissions from Light-duty Vehicles (China 6) ISO 10521-1 Road Vehicles - Road Load - Part 1: Determination under Reference Atmospheric Conditions3 Terms and Definitions
What is defined in GB/T 3730.1, GB/T 15089. GB 18352.6 and ISO 10521-1, and the following terms and definitions are applicable to this document. 3.1 road load The resistance that hinders the running of the vehicle when measured by the taxiing method or equivalent method, including the frictional resistance of the transmission system. 3.2 running resistance The resistance torque opposite to the direction of the running of the vehicle measured by a torque meter installed on the drive wheels of the vehicle. 3.3 target road load The road load to be reproduced on a chassis dynamometer. 3.4 target running resistance The running resistance to be reproduced on a chassis dynamometer. 3.5 chassis-dynamometer setting load The load set on the power absorption unit of a chassis dynamometer. 3.6 simulated road load By loading on a chassis dynamometer, the actual measured road load on the road is reproduced in the form of force. 3.7 simulated running resistance By loading on a chassis dynamometer, the actual measured running resistance on the road is reproduced in the form of force. 3.8 reference speed The vehicle running speed used to determine road load or chassis dynamometer load. 3.9 speed range Starting from 20 km/h, in steps of 10 km/h, increase to the maximum reference speed. 3.10 chassis dynamometer of coefficient control A chassis dynamometer that determines the absorption characteristics using approximate polynomial coefficients for given road loads. 3.11 chassis dynamometer of polygonal control A chassis dynamometer that determines the absorption characteristics using given load values at several speed points. b) If the maximum reference speed plus 14 km/h is greater than or equal to the maximum speed of the test vehicle, when determining the road load, or setting the resistance on the chassis dynamometer, this speed shall be eliminated. At this moment, the second highest reference speed becomes the maximum reference speed of the vehicle. 5.2 Laboratory Conditions 5.2.1 Roller 5.2.1.1 The roller of the chassis dynamometer shall have a clean, dry and rough surface without foreign matters. Counterweights can be placed on or in the vehicle to prevent wheel slipping. The counterweight conditions shall be recorded. 5.2.1.2 For multi-roller chassis dynamometer, the roller shall be operated in the same coupled or uncoupled state as in subsequent tests. The rotational speed of the chassis dynamometer shall be measured on a roller coupled to a power absorption unit. 5.2.2 Indoor temperature The laboratory temperature shall be set to 23 C 5 C, or in accordance with special test demands. 5.3 Preparation of Chassis Dynamometer 5.3.1 Inertia setting 5.3.1.1 The equivalent inertia shall be set in accordance with 5.3.1.2 and 5.3.1.3. If it cannot be set, the adjacent larger equivalent inertia shall be used for setting, but the maximum shall not exceed 10 kg. 5.3.1.2 When the vehicle is tested on a four-wheel drive chassis dynamometer, if the front and rear axles simultaneously rotate, the equivalent inertia of the chassis dynamometer shall be set to the corresponding vehicle test mass. 5.3.1.3 When the vehicle is tested on a two-wheel drive chassis dynamometer, the equivalent inertia of the chassis dynamometer shall be set to the vehicle test mass plus the effective inertia of the wheels that does not affect the measurement results, or 50% of the rotation mass. 5.3.2 Pre-heating of chassis dynamometer The chassis dynamometer shall be pre-heated in accordance with the chassis dynamometer manufacturer’s instructions, or other suitable methods, until the internal frictional losses can be stabilized. 5.4 Vehicle Preparation 5.4.1 Adjustment of tyre pressure Before the test, the tyre pressure shall be adjusted to the recommended value, which shall be the same as in subsequent tests. If a small diameter roller is used, the tyre pressure can be increased to ensure test safety, usually by 50%. 5.4.2 Vehicle setting 5.4.2.1 The vehicle under test shall be installed in the center of the chassis dynamometer roller and fixed in a safe mode. For a single roller, the horizontal distance between the tyre contact point and the top of the roller shall be within 25 mm or 2% of the roller diameter, whichever is smaller. 5.4.2.2 When using the torque meter method for measurement, the tyre pressure shall be adjusted to within 0.5% of the tyre dynamic radius. If the adjustment causes the tyre pressure to exceed the range specified in 5.4.1, then, the torque meter method shall not be used for measurement. 5.4.2.3 The tyre dynamic radius is the average value of tyre dynamic radius calculated at the reference speed of 80 km/h or at each reference speed in accordance with A.2.1. 5.4.3 Pre-heating of vehicle 5.4.3.1 The load can be set in accordance with the chassis dynamometer of similar vehicle models, or the initial load specified in 6.1.1.1 or 6.2.1.1 can be selected in accordance with different measurement methods to set the power absorption unit of the chassis dynamometer during pre-heating. 5.4.3.2 The vehicle shall be thoroughly pre-heated on the chassis dynamometer to reach a stable state. It is advisable to run at a constant speed of no less than 80 km/h for no less than 20 minutes or run for 1 ~ 2 complete CLTCs (for vehicles with a maximum design total mass greater than 3,500 kg, run CHTCs instead). NOTE 1: CLTC (China light-duty vehicle test cycle). NOTE 2: CHTC (China heavy-duty vehicle test cycle).6 Load Setting of Chassis Dynamometer
6.1 Chassis Dynamometer Setting by the Taxiing Method 6.1.1 Load setting of chassis dynamometer 6.1.1.1 Initial load setting For chassis dynamometer of coefficient control, in accordance with the initial coefficients Ad, Bd and Cd provided in Formula (1), the power absorption unit of the chassis dynamometer shall be adjusted. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
