The diesel engine vehicles registered in Tainan County are in the grand amount of about 25,000 sets. Among them there are 9,025 sets of large-size passenger and transporting trucks (the passenger vehicles share 748 sets and trucks share 8,277 sets), the rest vehicles are about 16,000 set associated by small passenger cars and small trucks. After executing the controlling strategy on diesel engine vehicles in the past a few years, the black-smoke- emitting diesel engine vehicles driving along the highways Have been outstandingly reduced in amount. However, under the reason of bad economic condition and unsatisfied income level, diesel vehicle owners still are unwilling to spend more money to make normal maintenance and modification to the diesel vehicles. After EPA has revised and proclaimed the vehicle inspection & test method to increase the horsepower ratio in rejection and implemented for over one year, it still keeps about 20% of vehicle rejection ratio under vehicle tests, which shows that the improperly modulated vehicle situation is apparent. Regarding the fuel oil sorts, so far the sulfur concentration standard of fuel oil is down to 50ppm, all gas stations now are providing low-sulfur diesel fuel or called super fuel; yet, under the cost consideration, certain diesel vehicles still are consuming the illegal fuel now. Therefore, we have to review the effectiveness of controlling the fuel source and work to resolve it in order to thoroughly control and reduce the pollutant source, whereas the vehicle-fuel-auditing task can merely solve for the surface problem.

Chasis Dynamometer Smoke Test