The great diversity of dedicated hybrid transmissions(DHTs)requires a method to identify solutions among all potential concepts involved in each structure.Therefore,a DHT synthesis tool is developed on the basis of ge...The great diversity of dedicated hybrid transmissions(DHTs)requires a method to identify solutions among all potential concepts involved in each structure.Therefore,a DHT synthesis tool is developed on the basis of general transmission synthesis.In the first synthesis step,transmission structures are generated with only conventional functions such as driving with only the internal combustion engine.Electric machines are then installed in the transmissions to achieve further hybrid functions,including boosting,eCVT and electric driving modes.The number of generated transmission concepts increases exponentially with each synthesis step.Various evaluations are carried out successively to identify the most suitable DHT concepts among the many possible solutions.The generated DHT concepts are evaluated in terms of structural feasibility,driving modes,drivability and load factors on transmission components.An example of DHT synthesis involving planetary gear sets is explained in detail.The best five DHT structures are identified out of more than 120 billion solutions.展开更多
Dedicated hybrid transmission(DHT)is the developing trend of hybrid transmissions.This paper studies different types of DHTs regarding the structure,function,and performance.Firstly,the structure and function of diffe...Dedicated hybrid transmission(DHT)is the developing trend of hybrid transmissions.This paper studies different types of DHTs regarding the structure,function,and performance.Firstly,the structure and function of different well-known DHTs in the market are discussed and analyzed.Through the analysis,the reasonability and necessity of the different modes and the electric motor power requirements that lie behind different DHTs are derived.Secondly,the dynamics of different DHTs are further compared with the driving areas in different modes under different driving conditions.Then,the basic or minimum dynamic requirements are defined and taken into consideration before the economic comparison.To ensure the effectiveness of the comparison,the optimization of the configurations for each kind of DHT is carried out with the modular simulation model.The economic comparison is conducted under the premise of excluding the influences of the configurations in the results.Finally,the sensitivity and influence of different engine characteristics for different DHTs are studied to find out the sensibilities of the two kinds of DHTs with engine technology.Through these studies,the essential differences and features of different DHTs can be derived to help better understand the decision in choosing the technical route for the original equipment manufacturers.展开更多
文摘The great diversity of dedicated hybrid transmissions(DHTs)requires a method to identify solutions among all potential concepts involved in each structure.Therefore,a DHT synthesis tool is developed on the basis of general transmission synthesis.In the first synthesis step,transmission structures are generated with only conventional functions such as driving with only the internal combustion engine.Electric machines are then installed in the transmissions to achieve further hybrid functions,including boosting,eCVT and electric driving modes.The number of generated transmission concepts increases exponentially with each synthesis step.Various evaluations are carried out successively to identify the most suitable DHT concepts among the many possible solutions.The generated DHT concepts are evaluated in terms of structural feasibility,driving modes,drivability and load factors on transmission components.An example of DHT synthesis involving planetary gear sets is explained in detail.The best five DHT structures are identified out of more than 120 billion solutions.
文摘Dedicated hybrid transmission(DHT)is the developing trend of hybrid transmissions.This paper studies different types of DHTs regarding the structure,function,and performance.Firstly,the structure and function of different well-known DHTs in the market are discussed and analyzed.Through the analysis,the reasonability and necessity of the different modes and the electric motor power requirements that lie behind different DHTs are derived.Secondly,the dynamics of different DHTs are further compared with the driving areas in different modes under different driving conditions.Then,the basic or minimum dynamic requirements are defined and taken into consideration before the economic comparison.To ensure the effectiveness of the comparison,the optimization of the configurations for each kind of DHT is carried out with the modular simulation model.The economic comparison is conducted under the premise of excluding the influences of the configurations in the results.Finally,the sensitivity and influence of different engine characteristics for different DHTs are studied to find out the sensibilities of the two kinds of DHTs with engine technology.Through these studies,the essential differences and features of different DHTs can be derived to help better understand the decision in choosing the technical route for the original equipment manufacturers.
