According to the monthly statistical report of vehicles in December 2019, there are around eight hundred and forty thousand diesel engine vehicles in Taiwan. To ensure the emission quality of diesel vehicle’s life cycle is one of the important subjects of government. Therefore, in order to protect the air quality, the Environmental Protection Administration of executive conducts the emission control policy of new vehicles and of in-use vehicles that is according to the Air Pollution Control Act. In this project, the first part of new vehicles emission control includes new vehicle certification, quality control and productive sampling tests which to ensure the emission quality is consistency. The second part of in-use vehicle emission control is through recall investigation and real-world driving test to monitor the emission qualities. In the current year, the conformity of the production of 27 vehicle manufacturers and inspection of vehicle quality control has been completed. There was one vehicle type did not pass the test which PN exceeded the emission standard (under the retesting process). Furthermore, in order to validate in-use vehicle emission and to assist the emission-quality to satisfy the requirement of conformity of production vehicles, the 2 vehicle models of in-use diesel vehicle recall investigations have also carried out. In order to keep the exhaust quality and the rights of the consumer, the six cases of recall in the foreign have been monitored and pursued. On the other hand, in response to the implementation of 6-stage emission standard regulation and to promote the policy of accelerating phase out old heavy-duty diesel vehicles, the “Regulations Governing Issuance, Revocation, and Cancellation of Emissions Certificate of Conformity for Diesel and Alternative Clean Fuel Engine Vehicles”, “emission standard” and “In-Use motor vehicle recall and correction regulations” have also been modified and announced. In the same time, to follow the trend of NOx emission control and policy of emission reduction of high-emitted in-use vehicles in Taiwan, the testing method of NOx emission in diesel vehicle emission inspection station, real-driving emission test by Portable Emission Measurement System (PEMS) and the benefit of emission reduction via in-used vehicle equipped with SCR+DPF system have been conducted in this project. This project has established some achievements as follows: (1) A quick testing method of NOx concentration emission at 80% full load that could be applied to the inspection of the effective operation of an SCR system ;(2) We completed the real-driving emission tests that included 4 light-duty and 1 heavy-duty vehicle. The result of NOx-CF values ranged from 0.05~ 2.16 and it was closed to the result of ICCT. There was no obvious difference. The capability of real-road testing on 6-stage emission standard regulation has been established by this project; (3) After the real-road testing of the vehicle that equips with DPF+SCR system, the NOx reduction could reach about 65% under the vehicle speed ranged from 30 to 60km/hr, and the PM reduction could reach 99% under the same condition. The durability validation of aftertreament system and remote monitoring technology has also established. However, the higher cost of the SCR+DPF system and the urea consumption, the installation of DPF system has been still suggested as the main policy at this time. These accomplishments could become emission control strategies for the government, and let the management of diesel vehicles in Taiwan become more complete.

New vehicle random check, Recall, Real-Driving Emissions Test