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Development of a Compound Power-split Hybrid Power System for Commercial Vehicles

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Abstract

A novel compound power-split hybrid power system based on two planetary gear sets for commercial vehicles is developed. The equivalent lever diagram is used to investigate the components speed and torque characteristics of the system, and then the system dynamic torque control and transmission efficiency are described in equations. Six types of operating modes which are divided into two pure electric modes and four hybrid modes are analyzed by the simplified combined lever diagrams, and their torque decoupling in form of formula is derived. The hybrid transmission (HT) external characteristic is analyzed simultaneously. A control strategy which implements the rule-based (RB) method for the system is depicted. To evaluate the performance of a hybrid vehicle equipped with this hybrid system, the vehicle control and physical models are developed. Then power performance and economic performance simulations are performed. Meanwhile, corresponding tests are carried out to validate simulations. Simulation and test results indicate that, the fuel consumption for C-WTVC of the vehicle equipped with the proposed hybrid system is about 11 L/100 km and it declines by 21% compared with 14 L/100 km of the traditional vehicle.

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Abbreviations

i 01, i 02 :

gear ratio of PG1, PG2

i HT :

transmission ratio

i FD :

final drive ratio

n C :

speed of PG1, PG2 planetary carrier, rpm

n S1 :

speed of PG1 sun gear, rpm

n S2 :

speed of PG2 sun gear, rpm

n Out :

speed of output shaft, rpm

n Eng :

speed of engine, rpm

n E1 :

speed of motor E1, rpm

n E2 :

speed of motor E2, rpm

r :

wheel tire radius, m

v :

speed of vehicle, km/h

J C :

rotational inertia of PG1, PG2 planetary carrier, kgm2

J Eng :

rotational inertia of engine, kg·m2

J e1 :

rotational inertia of motor E1, kg·m2

J e2 :

rotational inertia of motor E2, kg·m2

J S1 :

rotational inertia of PG1 sun gear, kg·m2

J S2 :

rotational inertia of PG2 sun gear, kg·m2

J Out :

rotational inertia of output shaft, kg·m2

P E1 :

power of motor E1, kW

P Eng :

power of engine, kW

P Out :

power of output shaft, kW

T Eng :

torque of engine, N·m

T E1 :

torque of motor E1, N·m

T E2 :

torque of motor E2, N·m

T Load :

resistance torque of vehicle, N·m

T C :

torque of PG1, PG2 planetary carrier, N·m

T S1 :

torque of PG1 sun gear, N·m

T S2 :

torque of PG2 sun gear, N·m

T Out :

torque of output shaft, N·m

α C :

angular acceleration of PG1, PG2 planetary carrier, rad/s2

α S1 :

angular acceleration of PG1 sun gear, rad/s2

α S2 :

angular acceleration of PG2 sun gear, rad/s2

α Out :

angular acceleration of output shaft, rad/s2

η E1 :

efficiency of motor E1

η E2 :

efficiency of motor E2

η HT :

efficiency of transmission

Ф:

electric power split ratio

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Acknowledgement

This work was supported by the China High-Tech Development Program (863) under Grant 2011AA11A 207 and the Industrial Project under Contract No.13X100030027.

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Authors and Affiliations

  1. School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China

    Qing Li & Zhendong Zhang

  2. Corun Hybrid System Technology Co. LTD, 2888 Wanfeng Road, Fengjing Industrial Park, Jinshan District, Shanghai, 201501, China

    Jianyong Bai, Tong Zhang & Fuxiang Gai

Authors
  1. Qing Li
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  2. Zhendong Zhang
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  3. Jianyong Bai
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  4. Tong Zhang
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  5. Fuxiang Gai
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Correspondence to Zhendong Zhang.

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Li, Q., Zhang, Z., Bai, J. et al. Development of a Compound Power-split Hybrid Power System for Commercial Vehicles. Int.J Automot. Technol. 23, 135–147 (2022). https://doi.org/10.1007/s12239-022-0011-4

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  • DOI: https://doi.org/10.1007/s12239-022-0011-4

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