Analysis of the Engine Load Factor for a 67 kW Agricultural Tractor

This study aims to analyze the engine load factor of a 67 kW agricultural tractor to calculate national emission. Engine power was calculated using engine CAN data measured by the load measurement system. Plow tillage, rotary tillage and driving (field and road) operations were selected as major agricultural operations, and the field test was conducted considering the gear stage and initial engine rotational speed as major variables. The engine load factor was calculated as the ratio of the engine power during operations and the engine rated power, and a weight factor according to the usage ratio (plow tillage: 35.1%, rotary tillage: 39.8%, driving operation: 25.1%) was applied. The engine load factor was 0.85, 0.93, and 0.32 on average in plow tillage, rotary tillage, and driving operations. The integrated engine load factor was calculated as 0.75. This was found to be about 1.56 times higher than the conventional engine load factor of 0.48.