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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 1 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 1: Light-duty Vehicles
1 Scope
This part of GB/T 38146 specifies the composition of automotive test cycle for light-duty vehicles (including passenger cars and light-duty commercial vehicles).
This part is applicable to Class M1 and Class N1 vehicles, and to Class M2 vehicles with the maximum total design mass not exceeding 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/T 3730.1 Motor Vehicles and Trailers — Types — Terms and Definitions
GB/T 15089 Classification of Power-driven Vehicles and Trailers
3 Terms and Definitions
For the purpose of this document, the terms and definitions given in GB/T 3730.1, GB/T 15089 and the following apply.
3.1
light-duty vehicle
Class M1 and Class N1 vehicles, and Class M2 vehicles with the maximum total design mass not exceeding 3500 kg
3.2
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
3.3
China light-duty vehicle test cycle (CLTC)
general term of China automotive test cycle for Class M1 and Class N1 vehicles, and Class M2 vehicles with the maximum total design mass not exceeding 3500 kg
3.4
China light-duty vehicle test cycle for passenger car (CLTC-P)
China automotive test cycle for Class M1 vehicles
3.5
China light-duty vehicle test cycle for commercial vehicle (CLTC-C)
China automotive test cycle for Class N1 vehicles and Class M2 vehicles with the maximum total design mass not exceeding 3500 kg
3.6
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).
3.7
deceleration
test cycle of running vehicles with the acceleration (a) less than or equal to -0.15 m/s2
3.8
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 0.5km/h
3.9
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 0.5km/h
3.10
acceleration ratio
ratio of acceleration duration to total test cycle duration of running vehicles
3.11
deceleration ratio
ratio of deceleration duration to total test cycle duration of running vehicles
3.12
cruise ratio
ratio of cruise duration to total test cycle duration of running vehicles
3.13
idle ratio
ratio of idle duration to total test cycle duration of running vehicles
3.14
average speed
average of all speeds in the test cycle of running vehicles
3.15
average running speed
average of all speeds (except idle) in the test cycle of running vehicles
3.16
average acceleration
average of all accelerations in the test cycle of running vehicles
3.17
average deceleration
average of all decelerations in the test cycle of running vehicles
3.18
relative positive acceleration (RPA)
characteristic parameters describing the power requirements of test cycle curve, which can be calculated as follows:
Where,
i — the sampling time, in seconds (s);
vi — the vehicle speed in the ith second, in meters per second (m/s);
— the acceleration value of positive acceleration, in meters per square second (m/s2);
x — the vehicle mileage, in meters (m).
4 Composition of Test Cycle
4.1 General
China light-duty vehicle test cycle includes: China light-duty vehicle test cycle for passenger car and China light-duty vehicle test cycle for commercial vehicle.
Foreword II
1 Scope
2 Normative References
3 Terms and Definitions
4 Composition of Test Cycle
Annex A (Normative) CLTC Data
Annex B (Normative) General Method for Development of China Automotive Test Cycle
