Technical Brief

Theory and Application on Power-Cycling Variable Transmission System

[+] Author and Article Information
Huan Wang

State Key Laboratory of Mechanical Transmission,
Chongqing University,
Chongqing 400044, China
e-mail: huanwang@cqu.edu.cn

Dongye Sun

State Key Laboratory of Mechanical Transmission,
Chongqing University,
Chongqing 400044, China
e-mail: dysun@cqu.edu.cn

1Corresponding author.

Contributed by the Power Transmission and Gearing Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received July 4, 2016; final manuscript received October 18, 2016; published online December 12, 2016. Assoc. Editor: Hai Xu.

J. Mech. Des 139(2), 024501 (Dec 12, 2016) (6 pages) Paper No: MD-16-1485; doi: 10.1115/1.4035055 History: Received July 04, 2016; Revised October 18, 2016

Hydrodynamic drives, hydraulic drives, and friction drives have the common characteristics of continuously variable ratio but lower efficiency in comparison with gear meshing drive. A novel method for the design of power-cycling variable transmission (PCVT) has been proposed, which has the characteristics of continuously variable ratio and high efficiency in the whole working range. First, the power-cycling phenomena of powertrain system have been analyzed, and the basic configuration of PCVT system has been put forward. The feasible judgment criteria and the basic design principle of PCVT system are provided. The calculation formulas of speed ratio characteristic and efficiency characteristic of PCVT system are also derived. At last, the design patterns of PCVT system have been provided for illustrating the unique performance of PCVT system.

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Fig. 2

Layout of configuration of powertrain system

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Fig. 1

Power-cycling phenomena of powertrain system

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Fig. 7

The relationship of isys and icvt

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Fig. 3

Power-cycling variable transmission design patterns

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Fig. 4

The relationship of ηsys/ηk and iy

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Fig. 5

Efficiency characteristic of PCVT

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Fig. 6

First-gear transmission characteristics of PCVT

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Fig. 8

The efficiency characteristics of PCVT

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Fig. 9

The engine torque map

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Fig. 10

The engine fuel consumption map

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Fig. 11

The ECE and EUDC driving condition

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Fig. 12

The differences of instantaneous fuel consumption




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