Requirement for emission-related emission regulations for on-board diagnostic systems (OBD) for light or heavy-duty diesel vehicles, and related technical studies for fault diagnosis strategies and diagnostic functions, such as OBD monitoring Frequency requirements, super OBD limit speed limit torque limit function, and remote monitoring of OBD information function implementation. To carry out research on evaluation methods and test devices for key components of post-discharge processing, such as aging or failure evaluation tests for post-processing devices such as TWC, SCR, DPF, or GPF, and rapid aging methods and devices. Carry out vehicle emission test technology research, study emissions characteristics and influencing factors under on-board test conditions, study control technologies and control methods that meet the requirements of on-board test emissions, including through on-board or off-board purification technologies, and the synergy between the two.