Standard No.:	GB/T 38146.2-2019
English Name:	China automotive test cycle—Part 2：Heavy-duty commercial vehicles
Chinese Name:	中国汽车行驶工况 第2部分：重型商用车辆
Chinese Classification:	T40    Automobiles in general
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR; SAC
Issued on:	2019-10-18
Implemented on:	2020-5-1
Status:	valid
Target Language:	English
File Format:	PDF
Word Count:	4500 words
Translation Price(USD):	110.0
Delivery:	via email in 1 business day

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. GB/T 38146 consists of the following parts under the general title China Automotive Test Cycle: — Part 1: Light-duty Vehicles; — Part 2: Heavy-duty Commercial Vehicles; — Part 3: Engines. This part is Part 2 of GB/T 38146. This part is drafted in accordance with the rules given in the GB/T 1.1-2009 This part was proposed by the Ministry of Industry and Information Technology of the People's Republic of China. This part is under the jurisdiction of the National Technical Committee of Auto Standardization (SAC/TC 114). China Automotive Test Cycle — Part 2: Heavy-duty Commercial Vehicles 1 Scope This part of GB/T 38146 specifies the composition of automotive test cycle for heavy-duty commercial vehicles. This part is applicable to commercial vehicles with the maximum total design mass more than 3500 kg. 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 referenced document (including any amendments) applies. GB 1589-2016 Limits of Dimensions, Axle Load and Masses for Motor Vehicles, Trailers and Combination Vehicles GB/T 3730.1 Motor Vehicles and Trailers — Types — Terms and Definitions GB/T 15089 Classification of Power-driven Vehicles and Trailers GB/T 27840-2011 Fuel Consumption Test Methods for Heavy-duty Commercial Vehicles GB/T 38146.1-2019 China Automotive Test Cycle — Part 1: Light-duty Vehicles 3 Terms and Definitions For the purpose of this document, the terms and definitions given in GB/T 3730.1, GB/T 15089, GB/T 27840-2011, GB 1589-2016, GB/T 38146.1-2019 and the following apply. 3.1 China automotive test cycle time-speed curve that describes the test cycle of particular vehicles (e.g., passenger cars, commercial vehicles, city buses, etc.) in a Chinese traffic environment 3.2 China heavy-duty commercial vehicle test cycle (CHTC) general term of China automotive test cycle for heavy-duty commercial vehicle with the maximum total design mass more than 3 500 kg 3.3 China heavy-duty commercial vehicle test cycle for bus and coach general term of China automotive test cycle for bus and coach with the maximum total design mass more than 3 500 kg, which includes China heavy-duty commercial vehicle test cycle for city bus (CHTC-B) and China heavy-duty commercial vehicle test cycle for common bus (CHTC-C) 3.4 China heavy-duty commercial vehicle test cycle for truck general term of China automotive test cycle for truck with the maximum total design mass more than 3 500 kg, which includes China heavy-duty commercial vehicle test cycle for light-duty truck (GVW≤5 500 kg) (CHTC-LT) and China heavy-duty commercial vehicle test cycle for heavy-duty truck (GVW>5 500 kg) (CHTC-HT) 3.5 China heavy-duty commercial vehicle test cycle for dumper (CHTC-D) general term of China automotive test cycle for dumper with the maximum total design mass more than 3 500 kg 3.6 China heavy-duty commercial vehicle test cycle for tractor-trailer (CHTC-TT) general term of China automotive test cycle for tractor-trailer with the maximum total design mass more than 3 500 kg 3.7 acceleration test cycle of running vehicles with the acceleration (a) greater than or equal to 0.15 m/s2, and the acceleration calculation formula is as follows: where: i — the sampling time, in seconds (s); V — the vehicle speed, in kilometers per hour (km/h); T — the total time of test cycle, in seconds (s). 3.8 deceleration test cycle of running vehicles with the acceleration (a) less than or equal to -0.15 m/s2 3.9 cruise test cycle of running vehicles with the absolute value of acceleration (a) less than 0.15 m/s2, and the running speed (v) is greater than or equal to 0.5 km/h 3.10 idle test cycle of running vehicles with the absolute value of acceleration (a) less than 0.15 m/s2, and the running speed (v) is less than 0.5 km/h 3.11 acceleration ratio ratio of acceleration duration to total test cycle duration of running vehicles 3.12 deceleration ratio ratio of cruise duration to total test cycle duration of running vehicles 3.13 cruise ratio ratio of cruise duration to total test cycle duration of running vehicles 3.14 idle ratio ratio of idle duration to total test cycle duration of running vehicles 3.15 average speed average of all speeds in the test cycle of running vehicles 3.16 average running speed average of all speeds (except idle) in the test cycle of running vehicles 3.17 average acceleration average of all accelerations in the test cycle of running vehicles 3.18 average deceleration average of all decelerations in the test cycle of running vehicles 3.19 relative positive acceleration (RPA) characteristic parameters describing the power requirements of test cycle curve, which can be calculated as follows:

Foreword II 1 Scope 2 Normative References 3 Terms and Definitions 4 Composition of Test Cycle Annex A (Normative) CHTC Data