Abstract
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.
Highlights
There are two powertrain solutions for plug-in hybrid electric vehicle (PHEV)/hybrid electric vehicle (HEV): add-on hybrid and dedicated hybrid transmission (DHT)
Concerning power-split DHT, it can be further divided into one-mode DHT and two-mode DHT according to the number of the power-split modes
What are the features of different DHTs in the structure and function? Especially for the well-known DHTs, what advantages enable their superiority? Besides, DHT needs to be configured in the powertrain
Summary
There are two powertrain solutions for plug-in hybrid electric vehicle (PHEV)/hybrid electric vehicle (HEV): add-on hybrid and dedicated hybrid transmission (DHT). Speaking, according to the structure and function, all the DHTs existing in the market can be further divided into two categories: series-parallel DHT and power-split DHT. This paper is organized as follows: The comparison of series-parallel and power-split DHT in structure is described in Sect. After analyzing different series-parallel DHTs, such as VW Twin Drive and GAC G-MC system, it is found that all of those DHTs possess the same principle in function and the same basic layout in structure. It means that for all layouts of this type of DHT, there is always one gear ratio or direct connection between the engine and generator. After the studies, it is near impossible to find out any other series-parallel DHT that are simpler than Honda Accord i-MMD, VW Twin Drive, and GAC G-MC
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