Analysis of engine load factor for a 90 kW agricultural combine harvester based on working speed

Young-Woo Do1, Taek-Jin Kim2, Ryu-Gap Lim3, Seung-Yun Baek4, Seung-Min Baek4, Hyeon-Ho Jeon4, Yong-Joo Kim4,5,*, Wan-Soo Kim1,6,*

1Department of Bio-Industrial Machinery Engineering, Kyungpook National University, Daegu 41566, Korea
2Department of Drive System Team, TYM R&D Center, Iksan 54576, Korea
3Department of Smart Agriculture, Korea Agriculture Technology Promotion Agency, Iksan 54667, Korea
4Department of Smart Agriculture Systems, Chungnam National University, Daejeon 34134, Korea
5Department of Biosystems Machinery Engineering, Chungnam National University, Daejeon 34134, Korea
6Upland Field Machinery Research Center, Kyungpook National University, Daegu 41566, Korea

*Corresponding authors:,


This study aimed to evaluate the engine load factor (LF) of a 90 kW agricultural combine harvester. The combine harvester used in this study is equipped with an electronic engine, and real-time engine data (torque and speed) was collected through a controller area network. The speed of the combine harvester during harvesting operation was divided into three levels (4, 5, and 6 km/h) for the representative operation speed range of 4 to 6 km/h. The LF was calculated using the engine load data measured in real time during harvesting. A weight was applied to the LF for each condition based on a survey of the usage. Results of the field test showed that the LF was 0.53, 0.64, and 0.87 at working speeds of 4, 5, and 6 km/h, respectively. The highest engine load factor was recorded at 6 km/h. Finally, based on the weight for the usage applied, the integrated engine LF was analyzed to be 0.69, which is approximately 144% higher than the currently applied LF of 0.48. A study on LF analysis for the entire work cycle, including idling and driving of the combine harvester, will be addressed in a future study.


combine harvester, engine characteristics, exhaust emissions, harvesting operation, load factor

More details can be read in the PDF