67 kW급 농업용 트랙터의 엔진 평균출력 비율 분석 = Analysis of Engine Average Power Ratio of the 67 kW-class Agricultural Tractor

다국어 초록 (Multilingual Abstract)

With the continuous rise in fuel consumption for operating agricultural machinery, emission regulations are being strengthened. One of the most important factors for establishing emission standards is the average power ratio (APR). Currently, in the field of non-road vehicle, the APR was applied as 0.48 based on standards of ISO 8178-4. However, current APR was inaccurate because it was calculated based on diesel engine test mode. Therefore, it is required to analyze the tractor APR based on actual load data during operations. The purpose of this study is to propose reliable APR for tractors according to various conditions. In this study, a 67 kW class agricultural tractor was used. Data of torque and rotational speed of engine were collected using control area network (CAN) communication and data acquisition. The APR was analyzed by comparing the actual output power to the rated power of engine, and usage weight was selected through farmer surveys. The APR and usage weight were 0.79 and 35.1%, 0.87 and 39.8%, 0.32 and 25.1% in plow tillage, rotary tillage and driving operation, respectively. Considering the usage weight for each operation, the total APR was 0.70, and it is 1.45 times higher than the current APR (0.48). In the future study, research on optimization of the tractor APR should be conducted.