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Development of Shift Control System for Multi Stage Hybrid Transmission
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 28, 2017 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Toyota Motor Corporation developed a new hybrid system, Multi Stage Hybrid System, for the Lexus flagship coupe LC500h with the aim of achieving an excellent balance between fuel economy and acceleration performance. The Multi Stage Hybrid Transmission used in this new hybrid system includes a shift device located immediately after the power split device and motor.
Compared with previous hybrid systems, the new hybrid system improves fuel economy by reducing electrical loss in the optimal gears, which are selected depending on the driving state. The system also improves acceleration performance by increasing the driving force at low and medium vehicle speeds in lower gears. In addition, the range of the power split device that cooperates with the shift device was widened to enable both an electrically-controlled continuously variable transmission mode and a ten-speed transmission mode, which creates a direct shift feeling to improve driving pleasure.
This system contains many independent variables given by the interactions of the engine, generator, motor, and shift device. Thus, conventional control methods were not appropriate for devising the shift control of the system. In addition, shift performance may also be affected by the particular constraints of a hybrid system, such as battery limitations.
This paper describes the shift control system for the Multi Stage Hybrid Transmission that was developed to resolve these issues.
|Technical Paper||Concept and Approach of Multi Stage Hybrid Transmission|
|Journal Article||Development of Multi Stage Hybrid System for New Lexus Coupe|
|Journal Article||Development of Multi Stage Hybrid Transmission|
- Kenta Kumazaki - Toyota Motor Corporation
- Tooru Matsubara - Toyota Motor Corporation
- Nobufusa Kobayashi - Toyota Motor Corporation
- Shunya Kato - Toyota Motor Corporation
- Kazuyuki Shiiba - Toyota Motor Corporation
- Ikuo Ando - Toyota Motor Corporation
- Hiromichi Kimura - Toyota Motor Corporation
- Hiroatsu Endo - Toyota Motor Corporation
CitationKumazaki, K., Matsubara, T., Kobayashi, N., Kato, S. et al., "Development of Shift Control System for Multi Stage Hybrid Transmission," SAE Technical Paper 2017-01-1150, 2017, https://doi.org/10.4271/2017-01-1150.
Data Sets - Support Documents
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- Adachi, M., Endo, H., Mikami, T., Yagi, K. et al., "Development of a New Hybrid Transmission for RWD Car," SAE Technical Paper 2006-01-1339, 2006, doi:10.4271/2006-01-1339.