무부하 급가속 측정 사이클로 운전되는 검사 대상 디젤 차량으로부터 배출되는 매연값 적분에 의한 차량 매연 대표값 특성 연구 = Contributed A Study on Evaluating a Representative Smoke Value from an Inspection Vehicle Using Integration Method over a Cycle of Free-Acceleration Test Mode

다국어 초록 (Multilingual Abstract)

Smoke emissions from light duty diesel vehicles were measured using light extinction method with the free acceleration test mode. The smoke emissions for each measurement cycle of the free acceleration method showed large variations according to driver`s pedal pushing pattern. The smoke values for each measurement cycle initially increased and reach a peak value. Integration of the smoke emissions with time for each measurement cycle was performed to get a representative smoke value which was obtained by averaging the integrated results. Two kinds of integration time range were used. One is range over the whole measurement cycle of the free acceleration method. The other is only the acceleration range in the measurement cycle. Overall, variation of the representative smoke values obtained by the integration method was reduced comparing to the traditional representative smoke value which was obtained from a peak smoke value over the measurement cycle. Ten vehicles of the same model with 2.5 liter diesel engines, and seven vehicles of the same model with 2.7 liter diesel engines, were tested using the free acceleration test method.