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Development of a Compact Compound Power-Split Hybrid Transmission Based on Altered Ravigneaux Gear Set
Technical Paper
2014-01-1793
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Several types of power-split hybrid transmissions are outlined and the strengths and weaknesses of typical compound power-split prototype designs are summarized in this paper. Based on an modified Ravigneaux gear set, a novel compound power-split hybrid transmission with compact mechanical structure is presented, its dynamic and kinematic characteristics in equations and operating modes are described, and then equivalent lever diagrams are used to investigate the proposed compound power-split device. Control strategies in different operating modes are discussed with the simplified combined lever diagram, and a global optimization method is implemented to find the optimum operation point for the hybrid powertrain. To evaluate the fuel economy of a hybrid car equipped with this hybrid transmission, a forward powertrain simulation model is developed and real vehicle performance tests are conducted in the chassis dynamometer. Simulations and test results show that the proposed hybrid transmission can improve the efficiency of the powertrain and demonstrate lower fuel consumptions than the corresponding conventional vehicle. We conclude that the most effective strategy for reducing the cost of vehicle powertrain manufacturing, decreasing the difficulty of control and improving vehicle fuel efficiency during city driving is to employ the new compound power-split hybrid transmission.
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Wang, C., Zhao, Z., Zhang, T., Dai, X. et al., "Development of a Compact Compound Power-Split Hybrid Transmission Based on Altered Ravigneaux Gear Set," SAE Technical Paper 2014-01-1793, 2014, https://doi.org/10.4271/2014-01-1793.Also In
References
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