With the project devoting to formulating the pollution control strategy on close to six million gasoline-fueled vehicles currently in use in Taiwan, the current year’s primary work includes formulating the on-board diagnostics (OBD) routine inspection system, maintenance/repair plant pollution improvement result evaluation, and in-use vehicles’ pollution discharge survey.
In response to stipulations for pairing an OBD system on all phase-four vehicles, the OBD inspection procedure and equipment prevailing in Europe and the United States have been introduced to conduct the demonstrative inspection implementation, by which to evaluate the feasibility of streamlining the OBD inspection as part of the routine inspection items. The current year has obtained a total of 2,582 sets of valid inspection results, with 0.56% of those containing faulty code, and 8% of those being found with anomaly in the readiness status. Based on the current year’s implementation result, it is recommendable that the OBD routine inspection may heed to MIL status visual inspection as a precedence, and also stepping up the OBD information campaigning before gradually expanding and adding the inspection equipment, items and standards.
In response to the OBD inspection likely to be inducted into the existing inspection procedure in the future, the project has widely invited DMV and consigned inspection personnel to stage three OBD car inspection demonstrations in the northern, central, and southern regions. In addition, to decipher the original vehicle manufacturers’ relevant air pollution prevention equipment inspection/repair procedure and content of the orientation training, the project has completed the visitation audit work on five major automotive plants, and the result indicates that their inspection/repair technology largely relies on OBD, and in pollution improvement on conventional vehicles, it merely relies on the technicians’ experience, but the pollution reduction result has been lackluster.
A total of 25 gasoline-fueled vehicles in use this year on lease have been put through the FTP-75 and the NEDC tests respectively. The FTP-75 test results show that the amount of pollution in 46% of the tested vehicles exceeds the new vehicle emission standard, and among them, the actual state of deterioration among phase-two vehicles is found to be severe than the designated deterioration. In terms of pollution, the fuel consumption ratings between the two types of driving cycles have high positive correlation; the consistency on the rendering results among phase-four vehicles on the two types of driving cycles has reached as high as 90%. With pollution discharge mainly generated at cold start and at high-speed increments, it is recommendable that adjustment can be made to the testing procedure. Pollution discharge and fuel consumption are ominously affected by the use of air-conditioning, and the result finds the differential in discharge volume of CO and NMHC can reach twice or more between the two situations.
