Design and Analysis of a Novel Super-Fast Multi-Gear Power-Split Hybrid Electric Vehicle The State Key Laboratory of Mechanical Transmission, Chongqi

Format:

Book

Conference/Event

Author/Creator:

Zou, Yunge, author.

Contributor:

Liu, Changdong

Yang, Yalian

Zhang, Yuxin

Conference Name:

SAE 2024 Vehicle Powertrain Diversification Technology Forum (2024-12-06 : Xi'An, China)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2025

Summary:

Electrified powertrain configurations are critical to the fuel economy and performance of hybrid vehicles. While single planetary gear (PG) configurations - such as the Toyota Prius - have the advantage of simple control and excellent fuel economy, the generator1 is unable to participate in the drive, resulting in poor acceleration. To overcome these problems, we propose a new multi-gear electronically controlled continuously variable transmission (ECVT) due to its high efficiency and excellent acceleration performance. It requires only one PG and two synchronizers. For this type of multi-gear ECVT hybrid vehicle, this paper describes in detail the synchronizer-based shift logic of the new configuration. Furthermore, the power flow and dynamics modeling process in different operating modes are systematically analyzed. In addition, the global optimal Dynamic Programming (DP) algorithm is presented and a new near-optimal energy management strategy, Rapid-DP, is employed to evaluate the acceleration and fuel consumption of the new design, respectively. The newly proposed design is also qualitatively and quantitatively analyzed under Federal Test Procedure 72 (FTP72), Highway Fuel Economy Test Cycle (HWFET) and Worldwide Harmonized Light Vehicles Test Cycle (WLTC) driving cycles. The case results show that compared with the original Toyota Prius, the proposed multi-gear ECVT configuration can effectively improve the overall performance, with a fuel economy improvement of 4.01%-4.96%, a power improvement of 50% on average, and a shift smoothness comparable to that of the Prius under different driving cycles, which verifies the validity of the new configuration proposed in this study. Meanwhile, this study provides a new theoretical basis for optimizing and modifying the technology path of multi-gear power-split hybrid vehicles

Notes:

Vendor supplied data

Publisher Number:

2025-01-7029

Access Restriction:

Restricted for use by site license