6 Purpose: This study developed a hybrid power system for agricultural machines with a 20 7 KW ou... more 6 Purpose: This study developed a hybrid power system for agricultural machines with a 20 7 KW output capacity, and it was attached on a multipurpose cultivator for evaluating 8 performance using output test. Methods: The hybrid system was combined heterogeneous 9 sources, an internal-combustion engine and an electric power. Also, a power splitter was 10 developed to simplify the power transmission structure. The cultivator with the hybrid system 11 was designed to have increased fuel efficiency and output power and reduced exhaust gas 12 emissions, while maintaining the functions of existing cultivator. Results: The fuel 13 consumption of driving in hybrid emission vehicle (HEV) mode was 341 g/KWh, which was 14 reduced by 36% compared with the one in engine (ENG) mode with the same load. The 15 maximum power take off (PTO) output of the hybrid power system was 14.8 KW, which was 16 increased by 38% compared with the engine operation. Harmful exhaust gas emissions from 17 the HEV mode were reduced, i.e. CO (36~41%) and NO x (27~51%) compared with the ENG 18 mode. Conclusions: The hybrid power system improved the fuel efficiency and reduced 19 exhaust gas emissions in agricultural machinery. Lower exhaust gas emissions of the hybrid 20 system have significant effects on closed work environments such as working in facilities; 21 therefore, agricultural machinery with less exhaust gas emissions should be commercialized. 22 However, high manufacturing cost and the complexity of the system were the challenges in 23 the future. 24 25
6 Purpose: This study developed a hybrid power system for agricultural machines with a 20 7 KW ou... more 6 Purpose: This study developed a hybrid power system for agricultural machines with a 20 7 KW output capacity, and it was attached on a multipurpose cultivator for evaluating 8 performance using output test. Methods: The hybrid system was combined heterogeneous 9 sources, an internal-combustion engine and an electric power. Also, a power splitter was 10 developed to simplify the power transmission structure. The cultivator with the hybrid system 11 was designed to have increased fuel efficiency and output power and reduced exhaust gas 12 emissions, while maintaining the functions of existing cultivator. Results: The fuel 13 consumption of driving in hybrid emission vehicle (HEV) mode was 341 g/KWh, which was 14 reduced by 36% compared with the one in engine (ENG) mode with the same load. The 15 maximum power take off (PTO) output of the hybrid power system was 14.8 KW, which was 16 increased by 38% compared with the engine operation. Harmful exhaust gas emissions from 17 the HEV mode were reduced, i.e. CO (36~41%) and NO x (27~51%) compared with the ENG 18 mode. Conclusions: The hybrid power system improved the fuel efficiency and reduced 19 exhaust gas emissions in agricultural machinery. Lower exhaust gas emissions of the hybrid 20 system have significant effects on closed work environments such as working in facilities; 21 therefore, agricultural machinery with less exhaust gas emissions should be commercialized. 22 However, high manufacturing cost and the complexity of the system were the challenges in 23 the future. 24 25
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