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- 주제어 : snap acceleration(무부하 급가속) (검색결과 1 건)
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무부하 급가속 디젤 차량으로부터 배출되는 매연 측정값 적분에 의한 매연 대표값 평가 방법 연구
이충훈(Choonghoon Lee) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Each country regularly inspects smoke emissions from diesel vehicles. The most common method used to inspect the smoke emissions from diesel vehicles is a snap acceleration test at no load. Currently, the representative smoke value of a tested vehicle is decided by averaging three peak values which are corresponding to the three consecutive measurement cycles. The biggest problem of the current method in deciding the representative smoke of tested vehicles based on the averaging 3 consecutive peak values is that it is severely varied according to the pattern how the driver pushes the accelerator. New methods based on integration are researched to calculate representative smoke values from the tested vehicle using the same data obtained by the snap acceleration test at no load. The smoke emissions for each measurement cycle were integrated with respect to time, and the average of the integrated values was obtained. Also, the smoke value of acceleration range in each measurement cycle was integrated and the average was obtained. The representative value of smoke emissions was analyzed according to the both old and new calculation method. The total 20 vehicles which are same model with 2 liter diesel engines, were tested using the snap acceleration at no load. It was found that the fluctuation of the smoke representative values of the tested vehicles was reduced when the average of the integrated values over either one measurement cycle or the acceleration range was used as representative values.
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