Journal of Shandong University(Engineering Science) ›› 2019, Vol. 49 ›› Issue (6): 98-106.doi: 10.6040/j.issn.1672-3961.0.2019.072

• Mechanical, Energy and Power Engineering • Previous Articles     Next Articles

Design and verification of power system for ECVT hybrid electric city bus

Youming TANG1,2(),Kun DONG1,2,Yuanwei ZHANG1,2   

  1. 1. School of Mechanical and Automotive Engineering, Xiamen University of Technology, Xiamen 361024, Fujian, China
    2. Fujian Collaborative Innovation Center for R&D of Coach and Special Vehicle, Xiamen 361024, Fujian, China
  • Received:2019-02-23 Online:2019-12-20 Published:2019-12-17
  • Supported by:
    福建省自然科学基金资助项目(2017J01493);福建省客车及特种车辆研发协同创新中心重点产品研发项目(2016AYF005)

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Abstract:

Aiming at the problem that the integrated starter/generator(ISG) hybrid power system was not ideal in fuel saving effect, this study selected the electronic continuously variable transmission(ECVT) hybrid power system scheme, which was applied and verified in plug-in hybrid electric city bus. Based on the equivalent lever analysis of the kinematics characteristics of a single planetary line, the parameters of key components of a plug-in ECVT power system were matched and calculated. According to the calibration test data, Matlab/Simulink software was used to establish the engine simulation model, drive motor simulation model and generator simulation model, to build the vehicle simulation model. Under typical urban bus cycle conditions in China, the fuel economy, dynamic performance and pure electric maximum continuous voyage characteristics of the target vehicle were studied, and the road tests of economy and dynamic performance were completed. The results showed that the ECVT hybrid system vehicle designed in this study could achieve fuel saving rate of 57.47% compared with traditional vehicles, and 24.12% higher than ISG hybrid system vehicle. Therefore, the adoption of ECVT hybrid power system for plug-in hybrid city bus was feasible and effective, and had obvious fuel saving effect.

Key words: ECVT, hybrid electric vehicle(HEV), power system, matching computation, city bus

Table 1

Basic parameters of vehicle"

轮胎半径
r/mm		 整备质量
m/kg		 最大总质量M/kg 主减速器比
I0		 迎风面积
A/m2		 风阻系数
CD		 滚动阻力系数f 传动效率
ηt		 旋转质量系数δ 空气密度
ρ/(kg·m-3)
478 9 500 16 500 6.14 7 0.65 0.008 5 0.95 1.05 1.29

Table 2

Technique target"

最大车速
vmax/(km·h-1)		 爬坡度β(满载，20 km/h) 0 ~50 km/h加速时间/s 城市工况平均油耗
Q/(L·(100 km-1))		 纯电续航里程
(半载40 km/h车速)s/km
纯电模式 混动模式下
69 ≥12% ≥16% ≤25 ≤18 不低于50 km

Fig.1

Schematic diagram of system structure"

Fig.2

Equivalent lever diagram"

Fig.3

Equivalent lever diagram of resistance balance in pure electric mode"

Fig.4

Resistance balance diagram in hybrid mode"

Fig.5

The speed following condition in the simulation process"

Fig.6

Fuel consumption curves"

Fig.7

Simulation results of maximum range in pure electric mode"

Fig.8

Simulation results of acceleration performance"

Fig.9

Simulation results of climbing performance"

Table 3

Test results of fuel economy"

序号 油耗/L 电耗/
(kW·h)		 综合油耗/L 行驶里程/
km		 折算百公里油耗/
(L·(100 km)-1)
1 0.96 -0.03 0.93 5.8 16.03
2 0.96 -0.04 0.92 5.8 15.86

Table 4

Test results of maximum endurance mileage"

序号 行驶距离
s/km		 试验车速
v/(km·h-1)		 试验初始
SOC/%		 试验终止
SOC/%
1 50 40 100 10.6
2 50 40 100 12.1
3 50 40 100 11.5

Fig.10

Data processing result of accelerated performance test"

Fig.11

Data collection curve of maximum speed test"

Table 5

Comparison of simulation results with test results"

试验项目 油耗/
(L·(100 km-1))		 节油率/% 0 ~50 km/h时间/s 最高试验车速/
(km·h-1)		 最大爬坡度/% 初始SOC/% 结束SOC/%
ISG系统试验结果 21.02 43.95 27 69 11.3 100 11
ECVT仿真结果 15.27 59.28 12.4 70 14.6 100 12.2
ECVT试验结果 15.95 57.47 13.1 69 100 11.4
误差/% 4.26 4.26 5.34 1.45 0 7.02
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