GB/T 38146.2-2019

This standard defines the specific driving cycles and test procedures used to evaluate the fuel consumption and emissions of heavy-duty commercial vehicles, such as trucks and buses, under Chinese road conditions. It is applied by manufacturers and regulatory agencies during vehicle type approval and certification processes to ensure compliance with China's national fuel economy and emission standards. The standard replaces foreign test cycles with data representative of actual driving patterns in China, including urban, rural, and highway conditions.