The government is conducting smoke precision tests to accurately measure and manage the smoke emitted from automobiles. Research is being done to adopt efficient inspection methods. However, there is a lack of research done on measures for old vehicles that exceed smoke standards, and how much smoke...
The government is conducting smoke precision tests to accurately measure and manage the smoke emitted from automobiles. Research is being done to adopt efficient inspection methods. However, there is a lack of research done on measures for old vehicles that exceed smoke standards, and how much smoke reduction effect depends on actions. In this study, we did chemical cleaning of carbon sediment in the intake manifold of 2 diesel vehicles that ran more than 120,000 km and were over 5 years old. The difference in the smoke density before and after chemical cleaning was measured, and the effect on the smoke density as the mileage accumulated after cleaning was evaluated in two test modes. 2WD test mode (KD-147) and 4WD test mode (Rapid acceleration under no-load) were implemented for the test method. As a result of the study, when measured before and after chemical cleaning, the KD-147 mode reduced smoke by 71.5%, and the rapid acceleration under no-load mode showed a reduction of 65.7%. When the smoke was measured for each mileage, the smoke reduced significantly after chemical cleaning (0 km) in both test modes, but the smoke increased about twice after driving 300 km or 600 km. The similar level of smoke was measured until 900 km. After that, the smoke began to decrease from 1,200 km, and it decreased sharply at 1,500 km, measuring 0.6% and 1.6% by mode. After 1,500 km of driving, the KD-147 mode reduced smoke by 94.8%, and Rapid acceleration under no-load mode showed a 78.9% reduction compared with before chemical cleaning. As a result, it was found that there was a chemical cleaning effect of the intake manifold.
The government is conducting smoke precision tests to accurately measure and manage the smoke emitted from automobiles. Research is being done to adopt efficient inspection methods. However, there is a lack of research done on measures for old vehicles that exceed smoke standards, and how much smoke reduction effect depends on actions. In this study, we did chemical cleaning of carbon sediment in the intake manifold of 2 diesel vehicles that ran more than 120,000 km and were over 5 years old. The difference in the smoke density before and after chemical cleaning was measured, and the effect on the smoke density as the mileage accumulated after cleaning was evaluated in two test modes. 2WD test mode (KD-147) and 4WD test mode (Rapid acceleration under no-load) were implemented for the test method. As a result of the study, when measured before and after chemical cleaning, the KD-147 mode reduced smoke by 71.5%, and the rapid acceleration under no-load mode showed a reduction of 65.7%. When the smoke was measured for each mileage, the smoke reduced significantly after chemical cleaning (0 km) in both test modes, but the smoke increased about twice after driving 300 km or 600 km. The similar level of smoke was measured until 900 km. After that, the smoke began to decrease from 1,200 km, and it decreased sharply at 1,500 km, measuring 0.6% and 1.6% by mode. After 1,500 km of driving, the KD-147 mode reduced smoke by 94.8%, and Rapid acceleration under no-load mode showed a 78.9% reduction compared with before chemical cleaning. As a result, it was found that there was a chemical cleaning effect of the intake manifold.
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