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Keywords = dedicated hybrid transmission (DHT)

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18 pages, 7389 KB  
Article
Optimal Design of Power-On Downshift Control of Series-Parallel Hybrid Transmission Based on Motor Active Speed Regulation
by Xiangyang Xu, Kun Guo, Xuewu Liu, Hongzhong Qi, Peng Dong, Shuhan Wang and Wei Guo
Energies 2022, 15(17), 6214; https://doi.org/10.3390/en15176214 - 26 Aug 2022
Cited by 2 | Viewed by 2549
Abstract
Multi-speed transmission is the main development direction of hybrid transmission, which has brought higher shift quality requirements than traditional fuel vehicle transmission. However, there is less research on the shifting control of hybrid transmission, especially for the shifting control of dedicated hybrid transmission [...] Read more.
Multi-speed transmission is the main development direction of hybrid transmission, which has brought higher shift quality requirements than traditional fuel vehicle transmission. However, there is less research on the shifting control of hybrid transmission, especially for the shifting control of dedicated hybrid transmission (DHT), which uses the wet clutch as a shift element. This paper studies the power-on downshift process of a two-speed series-parallel hybrid transmission, proposes a shifting control strategy based on motor active speed regulation, and deeply analyzes the causes of maximum impact during the shifting process. The results show that the reverse torque produced in the process of eliminating the remaining slip is the root cause of the maximum impact. On this basis, two optimization strategies are proposed to reduce the shift impact and improve the shift quality. The simulation results show that the proposed optimization strategies can effectively suppress the shift impact. In the meanwhile, for any control pressure of the OG (off-going) clutch in the speed phase within the range of (2.44–2.53 bar), a high shift quality in which the maximum impact is controlled lower than 10 m/s3 can be achieved, which has high engineering value and practical significance. Full article
(This article belongs to the Special Issue Modeling and Control of Hybrid Powertrain System)
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20 pages, 3773 KB  
Article
Study and Analysis of a Multi-Mode Power Split Hybrid Transmission
by Xiaojiang Chen, Jiajia Jiang, Lipeng Zheng, Haifeng Tang and Xiaofeng Chen
World Electr. Veh. J. 2020, 11(2), 46; https://doi.org/10.3390/wevj11020046 - 12 Jun 2020
Cited by 8 | Viewed by 10056
Abstract
A two-motor power-split dedicated hybrid transmission (DHT) with two planetary gears is proposed for the applications of a hybrid electric vehicle (HEV) and plug-in HEV (PHEV). The proposed DHT can provide electronically controlled continuous variable transmission (eCVT) with two different gear ratios. One [...] Read more.
A two-motor power-split dedicated hybrid transmission (DHT) with two planetary gears is proposed for the applications of a hybrid electric vehicle (HEV) and plug-in HEV (PHEV). The proposed DHT can provide electronically controlled continuous variable transmission (eCVT) with two different gear ratios. One of two electric motors is employed to act as a speeder for splitting the input power of internal combustion engine (ICE) and the other acts as a torquer to assist ICE for boosting. Assisted by an electric motor, ICE can always be enhanced to operate at its efficient area for the benefits of fuel economy improvement. The maximum ICE torque is viable to be mechanically transmitted to vehicle wheels from standstill with two different gear ratios. This feature can help reduce the traction motor torque and power sizing significantly. The paper presents detailed theoretical analyses of the proposed eCVT. Comprehensive simulation demonstrations for a pickup truck HEV application are given to address that the vehicle fuel consumption can be considerably reduced without compromising acceleration performance. Full article
(This article belongs to the Special Issue Control and Optimization of Hybrid-electric Vehicle Powertrains)
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