Study of Series-Parallel and Power-Split DHT for Hybrid Powertrains

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.

A review of methods to improve power transmission for energy efficiency of both electric and hybrid vehicle

“…The power-split powertrain focuses on the planetary gear (PG) sets, also named the power split device (PSD). The downside of this configuration is that the electric path, the power flowing inside the PSD, generates high energy losses [15,17]. Above all, the Multimode powertrain is the most promising HEV structure since it allows greater fuel efficiency, lower emission, and better performance.…”

A Novel Architecture of Multimode Hybrid Powertrains for Fuel Efficiency and Sizing Optimization

“…The research topics of the recent studies include diverse research areas such as driving and regenerative control strategy of HEVs [1]- [3], optimal design of component sizing and electrical energy storage [4], [5], driving energy management strategy for HEV [6], a design methodology for compound-split hybrid electric vehicles with the compound lever diagram [7], comparative analysis of classical energy management optimization with reinforcement learning [8], a parametric model for power split hybrid transmissions [9], and thermal management and analysis of electrified drive systems and hydraulic hybrids [10]- [13]. For the research on architectures of hybrid systems, there have existed a number of studies for past decades since the 1970s and diverse recent studies like a multimode power split hybrid transmission [14], hybrid powertrain architectures for a fourwheel drive [15], series-parallel and power split architecture based dedicated hybrid transmissions (DHTs) [16], powertrain configuration of single motor hybrid systems [17], and novel powertrain architectures with Ravigneaux and planetary gear trains [18].…”

Study of the Impact of E-Machine in Hybrid Dual Clutch Transmission Powertrain

“…Hybridized powertrains can be generally of a dedicated or an add-on type [6,7]. Dedicated Hybrid Transmissions (DHT) use custom designed transmissions that can be mostly of a planetary gear train type [6,7].…”

“…Hybridized powertrains can be generally of a dedicated or an add-on type [6,7]. Dedicated Hybrid Transmissions (DHT) use custom designed transmissions that can be mostly of a planetary gear train type [6,7]. Add-on types are obtained by adding an Electric Motor (EM) to conventional powertrain at different positions.…”