Rapid Optimization of Multiple-Planetary-Gear Power-Split Hybrid Powertrains

2015 ◽  
Author(s):  
Weichao Zhuang ◽  
Xiaowu Zhang ◽  
Huei Peng ◽  
Liangmo Wang
Keyword(s):  
Design Space ◽  
Planetary Gear ◽  
Optimization Method ◽  
Exhaustive Search ◽  
Combination Method ◽  
Hybrid Powertrain ◽  
Operating Modes ◽  
Hybrid Powertrains ◽  
Power Split ◽  
Computationally Intensive

In recent years, clutches have been used to create multi-mode power-split hybrid electric vehicles (HEVs). Designing an HEV for optimal performance is computationally intensive because of the enormous design space. For single planetary gear (PG) or a double-PG hybrid powertrains, the design with the best fuel economy and launching performance can be identified through exhaustive search. Exhaustive search for a hybrid powertrain with 3PGs is computationally expensive, because of the astronomical number of design candidates. To address the design problem with extremely large design space, a rapid structure optimization method is proposed, which is based on combining different operating modes. A case study compares several different schemes against the results of the exhaustive search. The results show that the proposed mode combination method can identify almost 90% of the best designs. The proposed method shows great potential when applied to hybrid systems with three or more PGs.

Automated Modeling and Mode Screening for Exhaustive Search of Double-Planetary-Gear Power Split Hybrid Powertrains

2014 ◽  
Author(s):  
Xiaowu Zhang ◽  
Huei Peng ◽  
Jing Sun ◽  
Shengbo Li
Keyword(s):  
Planetary Gear ◽  
General Motors ◽  
Screening Process ◽  
Automated Modeling ◽  
Operating Modes ◽  
Hybrid Powertrains ◽  
Power Split ◽  
Model Year ◽  
Operation Flexibility

Double Planetary Gear (PG) power-split hybrid powertrains have been used in production vehicles from Toyota and General Motors. Some of the designs use clutches to achieve multiple operating modes to improve powertrain operation flexibility and efficiency at the expense of higher complexity. In this paper, an automatic modeling and screening process is developed, which enables exhaustively search through all designs with different configurations, clutch locations and operating modes. A case study was conducted based on the configuration used in the model year 2010 Prius and Camry hybrids. It was found that by adding clutches, fuel economy can be improved significantly for plug-in hybrid (charge depletion) operations.

Efficient Exhaustive Search of Power-Split Hybrid Powertrains With Multiple Planetary Gears and Clutches

2015 ◽  
Vol 137 (12) ◽  
Author(s):  
Xiaowu Zhang ◽  
Shengbo Eben Li ◽  
Huei Peng ◽  
Jing Sun
Keyword(s):  
Planetary Gear ◽  
Optimal Designs ◽  
Computationally Efficient ◽  
Energy Management Strategy ◽  
Screening Process ◽  
Automated Modeling ◽  
Operating Modes ◽  
Hybrid Powertrains ◽  
Power Split ◽  
And Control

Planetary gear (PG) power-split hybrid powertrains have been used in producing hybrid and plug-in hybrid vehicles from the Toyota, General Motor, and Ford for years. Some of the most recent designs use clutches to enable multiple operating modes to improve launching performance and/or fuel economy. Adding clutches and multiple operating modes, however, also increases production cost and design complexity. To enable an exhaustive but fast search for optimal designs among a large number of hardware configurations, clutch locations, and mode selections, an automated modeling and screening process is developed in this paper. Combining this process with the power-weighted efficiency analysis for rapid sizing method (PEARS), an optimal and computationally efficient energy management strategy, the extremely large design space of configuration, component sizing, and control becomes feasible to search through. This methodology to identify optimal designs has yet to be reported in the literature. A case study to evaluate the proposed methodology uses the configuration adopted in the Toyota Hybrid Synergy (THS-II) system used in the Prius model year 2010 and the Hybrid Camry. Two designs are investigated to compare with the simulated Prius design: one uses all possible operating modes; and the other uses a suboptimal design that limits the number of clutches to three.

scholarly journals Configuration optimization for improving fuel efficiency of power split hybrid powertrains with a single planetary gear

2018 ◽  
Vol 214 ◽  
pp. 103-116 ◽  
Author(s):  
Huanxin Pei ◽  
Xiaosong Hu ◽  
Yalian Yang ◽  
Xiaolin Tang ◽  
Cong Hou ◽  
...  
Keyword(s):  
Fuel Efficiency ◽  
Planetary Gear ◽  
Configuration Optimization ◽  
Hybrid Powertrains ◽  
Power Split

A Novel Three-Planetary-Gear Power-Split Hybrid Powertrain for Tracked Vehicles

2018 ◽  
Author(s):  
Zhaobo Qin ◽  
Yugong Luo ◽  
Zhong Cao ◽  
Keqiang Li
Keyword(s):  
Planetary Gear ◽  
Hybrid Powertrain ◽  
Tracked Vehicles ◽  
Power Split

scholarly journals Automatic Enumeration of Feasible Kinematic Diagrams for Split Hybrid Configurations With a Single Planetary Gear

2017 ◽  
Vol 139 (8) ◽  
Author(s):  
Toumadher Barhoumi ◽  
Dongsuk Kum
Keyword(s):  
First Generation ◽  
Design Space ◽  
Planetary Gear ◽  
Vehicle Design ◽  
Schematic Diagram ◽  
Configuration Optimization ◽  
Power Split ◽  
Kinematic Diagram ◽  
Powertrain Configuration ◽  
Selection Of

Most of the prior studies on power-split hybrid electric vehicle's (PS-HEV) design focused on the powertrain configuration optimization. Yet, depicting the selected configuration is highly required for further design steps, ultimately manufacturing. This paper proposes an automatic approach to generate all the feasible kinematic diagrams for a given configuration with a single planetary gear (PG) set. While the powertrain configuration, which is the output of prior studies, illustrates the connection of the powertrain components to the PG, the kinematic diagram is a schematic diagram depicting the connections and arrangements of the components. First, positioning diagrams, specifying the position of the components with respect to each other and to the PG, are used to find all the possible arrangements. Then, given that the positioning diagrams have a one-to-one relationship with the kinematic diagrams, the feasible kinematic diagrams are identified using a set of feasibility rules applicable to the positioning diagrams. Finally, few guidelines are introduced to select good kinematic diagrams that best suit the overall vehicle design. Various configurations were investigated, and three of them including Prius and Voltec first-generation single PG configurations are discussed. The study reveals that the kinematic diagrams that have been patented are only a subset of all the feasible kinematic diagrams, and that even some good kinematic diagrams with better manufacturability are identified using this methodology. Thus, this methodology guarantees the search of the entire design space and the selection of kinematic diagrams that best suit the desired vehicle.

scholarly journals Optimal design of three-planetary-gear power-split hybrid powertrains

2016 ◽  
Vol 17 (2) ◽  
pp. 299-309 ◽  
Author(s):  
W. Zhuang ◽  
X. Zhang ◽  
D. Zhao ◽  
H. Peng ◽  
L. Wang
Keyword(s):  
Optimal Design ◽  
Planetary Gear ◽  
Hybrid Powertrains ◽  
Power Split

Automated Schematic Design of Power-Split Hybrid Vehicles With a Single Planetary Gear

2014 ◽  
Author(s):  
Toumadher Barhoumi ◽  
Dongsuk Kum
Keyword(s):  
Electric Vehicles ◽  
Design Methodology ◽  
Systematic Approach ◽  
Hybrid Electric Vehicles ◽  
Planetary Gear ◽  
Hybrid Vehicles ◽  
Relative Location ◽  
Hybrid Powertrain ◽  
Power Split ◽  
Toyota Prius

Most of the previous research in the field of power-split hybrid electric vehicles focused on the powertrain topology optimization. However, depicting a given or found topology in the form of schematic diagram, required for the advanced steps of vehicles’ design, has not yet been studied. In this paper, we propose a systematic approach to automatically generate all feasible stick diagrams for all twelve split-hybrid powertrain topologies with a single planetary gear (PG). The stick diagram is a simplified cartoon layout that schematically illustrates the connections, arrangements, and positions of the powertrain components. The proposed process is divided into three steps. First, we introduce the placement diagram, which specifies the position of the components with respect to the planetary gear. Secondly, for each placement diagrams, all positioning diagrams are generated where the relative location of each component is determined. The use of positioning diagrams guarantees dealing with all the possible arrangements. Lastly, the feasible stick diagrams are selected by filtering out infeasible ones from the entire pool of candidate stick diagrams using a set of feasibility rules. The proposed method is used for several topologies, such as Toyota Prius and GM Volt, and it is found that the patented stick diagrams are a subset of all the feasible stick diagrams. Therefore, one can systematically generate all the feasible stick diagrams for any given single PG powertrain topology using the proposed design methodology.

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