| 英文摘要 |
This Plan has aimed to discuss and formulate relevant pollution control strategies specific to about 6 million gasoline cars in our nation’s use, with work items of this year including：Develop OBD system of regular inspection, make driving pattern tests on engaged vehicles met Environmental Protection IV emission standards, make investigations on relevant OBD examining lead-in conditions in car factories and archive OBD current control documents in European and American area.
During the implement of this plan, we have already archived functional specifications stipulated on OBD examining equipments in European and American area, and tried to discuss and formulate procedures which could be certified by our equipment system. In this year, we have obtained 3,392 sets of OBD examining data from supervision organs and agent factories, and as shown in outcome of statistical analysis, among those vehicles with diagnostic trouble codes, vehicles with dynamical system related diagnostic trouble codes have the highest percentage. As for vehicles under abnormal readiness status, not-ready vehicles under Catalyst and O2 Sensor monitoring have the highest percentage. According to the current-year on-trial outcomes, we suggest to lead into Malfunction Indicator Lamp visual examination items firstly, and gradually add other examining equipments, items and standards when car owners and relevant units have matured understandings.
This plan has also made statistical analysis on driving pattern test results of vehicles met Environmental Protection IV emission standards in recent two years, and outcome shows that CO and THC actual deterioration factor are lower than specified ones, but NOx emissions are on the rise among with the mileages; moreover, running down exhaust test results for 16 vehicles with abnormal OBD are all qualified, but with driving pollution over-limit ratio being 56.3%, which shows that OBD examining has a better assessment on driving pollution over-limit vehicles compared with running down exhaust test. Eliminate OBD abnormal problems through original factories’ standard maintenance processes, could have more obvious effects on pollutant emissions.
A investigation results from our nation’s four major car factories show that each factory under investigation has failed to specify OBD examining items and keep files. Some factories have not listed OBD into regular maintenance items. Most vehicle maintenance personnel for OBD monitoring devices how to get ready for the practice of the state do not understand, with maintenance procedures and system techniques supported by parent factories.
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