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Research Papers: Design of Direct Contact Systems

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

[+] Author and Article Information
Toumadher Barhoumi

Graduate School of Green Transportation,
Korea Advanced Institute of Science and
Technology (KAIST),
291 Daehak-ro, Yuseong-gu,
Daejeon 34141, South Korea
e-mail: toumadher@kaist.ac.kr

Dongsuk Kum

Graduate School of Green Transportation,
Korea Advanced Institute of Science and
Technology (KAIST),
291 Daehak-ro, Yuseong-gu,
Daejeon 34141, South Korea
e-mail: dskum@kaist.ac.kr

1Corresponding author.

Contributed by the Power Transmission and Gearing Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received September 30, 2016; final manuscript received April 10, 2017; published online May 23, 2017. Assoc. Editor: Massimiliano Gobbi.

J. Mech. Des 139(8), 083301 (May 23, 2017) (11 pages) Paper No: MD-16-1676; doi: 10.1115/1.4036583 History: Received September 30, 2016; Revised April 10, 2017

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.

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References

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Figures

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Fig. 1

Sample of patents generated for Prius configuration: (a) first patent filed for Prius powertrain configuration [5], (b) Toyota's first patented kinematic diagram [6], (c) Toyota's second patented kinematic diagram [7], and (d) Toyota's third patented kinematic diagram [8]

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Fig. 2

Planetary gear set: top and side views

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Fig. 3

All the possible powertrain configurations of PS-HEV with single PG. EM 1 is the electric machine always connected with either the engine or vehicle.

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Fig. 4

Flow chart of the automated design method to generate the feasible kinematic diagrams for a given configuration

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Fig. 5

The eight placement diagrams obtained for the Prius powertrain configuration

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Fig. 6

The fundamental placement diagram

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Fig. 7

Examples of few positioning diagrams of the placement diagram #1 Prius configuration illustrated in Fig. 5

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Fig. 8

Examples of positioning and kinematic diagrams illustrating the impact of double-component node on feasibility

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Fig. 9

Example of positioning diagrams when applying feasibility theorem #1: (a) infeasible case (one of 0-PG-3 (2C-together) in Table 1), (b) feasible case (one of 0-PG-3 (2C-together) in Table 1), (c) infeasible case (one of 1-PG-3 (2C-separate) in Table 1), and (d) feasible case (one of 1-PG-3 (2C-separate) in Table 1)

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Fig. 10

Example of positioning diagrams when applying feasibility theorem #2: (a) infeasible case (one of 1-PG-2 (2C-together) in Table 1), (b) feasible case (one of 1-PG-2 (2C-together) in Table 1), (c) infeasible case (one of 2-PG-2 (2C-separate) in Table 1), and (d) feasible case (one of 2-PG-2 (2C-separate) in Table 1)

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Fig. 11

Flowchart of the automated methodology to generate feasible kinematic diagrams for a given 1PG configuration, and select the good ones that best suit the vehicle

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Fig. 12

Four sample feasible kinematic diagrams obtained by the proposed method for the GM Volt powertrain configuration: (a) one feasible Volt example of case 1 in Table 1 (0-PG-3 (2C-together)), (b) one feasible Volt example of case 2 in Table 1 (1-PG-2 (2C-together)), (c) one feasible Volt example of case 3 in Table 1 (1-PG-3 (2C-seperate)), and (d) one feasible volt example of case 4 in Table 1 (2-PG-2 (2C-seperate))

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Fig. 13

Application of feasibility theorems on the 32 positioning diagrams of the eight placement diagrams of Prius configuration (#9). Note that FT is the abbreviation of feasibility theorem.

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