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GB/T 38146.2-2019 (GB/T38146.2-2019, GBT 38146.2-2019, GBT38146.2-2019) & related versions
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GB/T 38146.2-2019: PDF in English (GBT 38146.2-2019)
GB/T 38146.2-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.020
T 40
China automotive test cycle -
Part 2: Heavy-duty commercial vehicles
ISSUED ON: OCTOBER 18, 2019
IMPLEMENTED ON: MAY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Cycle construction ... 7 
Appendix A (Normative) Data of China heavy-duty commercial vehicle test cycle
... 15 
China automotive test cycle -
Part 2: Heavy-duty commercial vehicles
1 Scope
This Part of GB/T 38146 specifies the construction of the test cycle of heavy-
duty commercial vehicles.
This Part applies to commercial vehicles with a maximum design total mass
greater than 3500 kg.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
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
The terms and definitions defined in GB/T 3730.1, GB/T 15089, GB/T 27840-
2011, GB 1589-2016, and GB/T 38146.1-2019 and the following ones apply to
this document.
3.1 China automotive test cycle
The time-speed curve which describes the driving characteristics of a particular
vehicle (such as a passenger car, a commercial vehicle, a city bus, etc.) in a
Chinese traffic environment.
3.2 China heavy-duty commercial vehicle test cycle; CHTC
The general term for China automotive test cycle used by commercial vehicles
with a maximum design total mass greater than 3500 kg.
3.3 China heavy-duty commercial vehicle test cycle for bus and coach
The general term for China automotive test cycle used by bus and coach with
a maximum design total mass greater than 3500 kg, including China heavy-
duty commercial vehicle test cycle for city bus and coach (CHTC-B) and China
heavy-duty commercial vehicle test cycle for common bus and coach (CHTC-
C).
3.4 China heavy-duty commercial vehicle test cycle for truck
The general term for China automotive test cycle used by truck with a maximum
design total mass greater than 3500 kg, including China heavy-duty commercial
vehicle test cycle for truck (GVW≤5500 kg) (CHTC-LT) and China heavy-duty
commercial vehicle test cycle for truck (GVW>5500 kg) (CHTC-HT).
3.5 China heavy-duty commercial vehicle test cycle for dumper; CHTC-D
China automotive test cycle used by dumper with a maximum design total mass
greater than 3500 kg.
3.6 China heavy-duty commercial vehicle test cycle for tractor-trailer;
CHTC-TT
China automotive test cycle used by tractor-trailer with a maximum design total
mass greater than 3500 kg.
3.7 Acceleration
The cycle in which the acceleration a during vehicle travel is greater than or
equal to 0.15 m/s2. The calculation formula of acceleration is as follows:
Where:
i - Sampling instant, in seconds (s);
v - Vehicle speed, in kilometers per hour (km/h);
T - The total duration of the cycle, in seconds (s).
3.8 Deceleration
The cycle in which the acceleration a during vehicle travel is less than or equal
to -0.15 m/s2.
3.9 Cruise
The cycle in which the absolute value of the acceleration a during vehicle travel
is less than 0.15 m/s2 and the traveling speed v of the vehicle is greater than or
equal to 0.5 km/h.
3.10 Idle
The cycle in which the absolute value of the acceleration a during vehicle travel
is less than 0.15 m/s2 and the traveling speed v of the vehicle is less than 0.5
km/h.
3.11 Acceleration ratio
The ratio of the acceleration cycle time during vehicle travel to the total cycle
time.
3.12 Deceleration ratio
The ratio of the deceleration cycle time during vehicle travel to the total cycle
time.
3.13 Cruise ratio
The ratio of the cruise cycle time during vehicle travel to the total cycle time.
3.14 Idle ratio
The ratio of the idle cycle time during vehicle travel to the total cycle time.
3.15 Average speed
The average of the speeds of all cycles during vehicle travel.
3.16 Average running speed
The average of the speeds of all non-idle cycles during vehicle travel.
3.17 Average acceleration
The average acceleration of all acceleration cycles during vehicle travel.
3.18 Average deceleration
The average deceleration of all deceleration cycles during vehicle travel.
3.19 Relative positive acceleration; RPA
The characteristic parameter which describes the power demand of the cycle
curve. Its calculation formula is as follows:
Where:
i - Sampling instant, in seconds (s);
vi - The vehicle speed at the ith second, in meters per second (m/s);
ai+ - An acceleration value of greater than 0 m/s2, in meters per square second
(m/s2);
x - The running mileage of vehicle, in meters (m).
4 Cycle construction
4.1 Overview
China heavy-duty commercial vehicle test cycle includes: China heavy-duty
commercial vehicle test cycle for city bus and coach, China heavy-duty
commercial vehicle test cycle for common bus and coach, China heavy-duty
commercial vehicle test cycle for truck (GVW≤5500 kg), China heavy-duty
commercial vehicle test cycle for truck (GVW>5500 kg), China heavy-duty
commercial vehicle test cycle for dumper, and China heavy-duty commercial
vehicle test cycle for tractor-trailer.
4.2 China heavy-duty commercial vehicle test cycle for city bus and coach
China heavy-duty commercial vehicle test cycle for city bus and coach (CHTC-
B) includes 2 speed ranges: low-speed (part 1) and high-speed (part 2). The
cycle duration is 1310 s. The cycle curve is shown in Figure 1. The statistical
characteristics of the cycle curve are shown in Table 1. The second-by-second
data of the cycle is shown in Appendix A. For the method of developing this
cycle, see Appendix B of GB/T 38146.1-2019.
......

BASIC DATA
Standard ID GB/T 38146.2-2019 (GB/T38146.2-2019)
Description (Translated English) China automotive test cycle -- Part 2: Heavy-duty commercial vehicles
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard T40
Classification of International Standard 43.020
Word Count Estimation 78,762
Date of Issue 2019-10-18
Date of Implementation 2020-05-01
Drafting Organization China Automotive Technology and Research Center Co., Ltd.
Administrative Organization National Automotive Standardization Technical Committee (SAC/TC 114)
Proposing organization Ministry of Industry and Information Technology of the People's Republic of China
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration