Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (6): 1951-1958.doi: 10.13229/j.cnki.jdxbgxb20180717

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Speed ratio control of electro⁃mechanical continuously variable transmission based on coupling characteristic

Jun-long LIU(),Dong-ye SUN(),Xiao-jun LIU,Yong YOU   

  1. State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044，China
  • Received:2018-07-06 Online:2019-11-01 Published:2019-11-08
  • Contact: Dong-ye SUN E-mail:liujunlong12388@126.com;dysun@cqu.edu.cn

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Abstract:

The structure and operating principle of the electro-mechanical continuously variable transmission (EMCVT) is analyzed. The coupling relation between the speed ratio and the driven pulley clamping force was illustrated and the model of the EMCVT actuator was developed. The speed ratio control strategy of the EMCVT was developed based on the coupling characteristic between the speed ratio and driven pulley clamping force. The control effect of this ratio control strategy was compared with that of conventional strategy using a simulation model of the EMCVT in MATLAB/Simulink. The results indicates that the response time of speed ratio is reduced by 14% when the speed ratio increases; and although the energy consumed by the EMCVT is increased, the vehicle dynamic performance is improved.

Key words: fluid transmission and control, electro-mechanical continuously variable transmission, coupling characteristic, speed ratio control, clamping force control

CLC Number: 

  • TH137

Fig.1

Structure diagram of electro-mechanical CVT"

Fig.2

Elastic force of belleville springs for driving pulley clamping force"

Fig.3

Flow chart of CVT control"

Table 1

Parameters of vehicle and electro?mechanical CVT"

整车 EMCVT
参数 参数 参数 参数
整车质量/kg 1180 带轮锥角的一半 11°
车轮半径/m 0.274 速比变化范围 0.5~2.5

风阻系数

迎风面积/m2

0.32

2.19

主从动轴间距/mm

金属带长度/mm

140

594

滚动阻力系数

主减速比

0.018

5.9

Fig.4

Change of throttle opening"

Fig.5

Response of speed ratio"

Fig.6

Driven pulley clamping force"

Fig.7

Energy consumed by actuator of electro-mechanical CVT"

Fig.8

Vehicle speed curve"

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