Research on Parameter Optimization Design Method for Dual-Motor Coupled Drive System
Abstract
:1. Introduction
2. Materials and Methods
2.1. Configuration of DMCDS
2.2. Modeling and Mode Analysis
2.2.1. Dynamics Modeling of DMCDS
2.2.2. Driving Mode Analysis
2.3. Parameter Optimization of DMCDS
2.3.1. Mathematical Models
- (1)
- Vehicle model
- (2)
- Motor model
- (3)
- Battery model
- (4)
- Efficiency model
2.3.2. Optimization Problem
- (5)
- Inner-layer optimization
- (6)
- Outer-layer component parameter optimization
2.3.3. Optimization Process
3. Results and Discussion
4. Conclusions
- (1)
- The selection of motor parameters and gear ratios exerts a substantial influence on the power losses and drive efficiency of the system. While keeping the system maximum output power unchanged, adjustments to the rated power, rated speed, and gear ratios can enhance the utilization efficiency of the high-efficiency region and effectively reduce electrical energy consumption.
- (2)
- The optimized motors exhibit an increase in rated speed and a decrease in peak torque, resulting in a substantial improvement in the utilization efficiency of the high-efficiency region. Compared to the prototype scheme, motors EM_R and EM_S experience an increase of 45% and 48%, respectively. Moreover, the optimized DMCDS achieves an average drive efficiency 2.5% and 4.2% higher than that of DMCDS-pro and SMDS, respectively, leading to DMCDS-opt possessing the lowest energy consumption of 16.95 kWh/100 km.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Working States | Driving Modes | M1 | M2 | B1 | B2 |
---|---|---|---|---|---|
Park/Neutral | N/P | ○ | ○ | ○ | ○ |
Driving states | M1S | ● | ○ | ○ | ● |
M1R | ○ | ● | ● | ○ | |
DMC | ● | ● | ○ | ○ |
Parameter | Meaning | Value |
---|---|---|
ms (kg) | Mass of vehicle | 1949 |
Af (m2) | Frontal area | 2.66 |
CD | Air resistance coefficient | 0.4 |
fr | Tire rolling friction coefficient | 0.015 |
rw (m) | Tire radius | 0.343 |
vmax (km/h) | Maximum velocity | 150 |
tacc (s) | 0–100 km/h acceleration time | 9 |
Parameter | Lower Limit | Upper Limit |
---|---|---|
Rated power of EM_S (kW) | 30 | 60 |
Rated speed of EM_S (r/min) | 2500 | 4000 |
Rated power of EM_R (kW) | 30 | 60 |
Rated speed of EM_R (r/min) | 2500 | 4000 |
Planetary gear ratio | 1.5 | 4 |
Final drive ratio | 4 | 6.5 |
Optimization Parameter | Optimized Parameter Value | Prototype Parameter Value |
---|---|---|
Rated power of EM_S (kW) | 33.5 | 32 |
Rated speed of EM_S (r/min) | 3500 | 2250 |
Rated power of EM_R (kW) | 31.5 | 32 |
Rated speed of EM_R (r/min) | 4000 | 2250 |
Planetary gear ratio | 2.26 | 1.86 |
Final drive ratio | 5.15 | 4.93 |
Parameter | Value |
---|---|
Rated power of motor (kW) | 64 |
Peak power of motor (kW) | 106 |
Rated speed of motor (r/min) | 2250 |
First gear ratio | 3.27 |
Second gear ratio | 1.98 |
Final drive ratio | 2.826 |
Schemes | SMDS | DMCDS-pro | DMCDS-opt | |
---|---|---|---|---|
Indicator | ||||
High-efficiency region utilization (efficiency > 90%) | 6.6% | EM_R 30.2% | EM_R 43.8% | |
EM_S 8.6% | EM_S 12.8% | |||
Electricity consumption (kWh/100 km) | 18.18 | 17.58 | 16.95 |
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Li, T.; Zhang, N.; Gao, X.; Pang, D. Research on Parameter Optimization Design Method for Dual-Motor Coupled Drive System. World Electr. Veh. J. 2023, 14, 282. https://doi.org/10.3390/wevj14100282
Li T, Zhang N, Gao X, Pang D. Research on Parameter Optimization Design Method for Dual-Motor Coupled Drive System. World Electric Vehicle Journal. 2023; 14(10):282. https://doi.org/10.3390/wevj14100282
Chicago/Turabian StyleLi, Tonghui, Nan Zhang, Xiaoyu Gao, and Daqian Pang. 2023. "Research on Parameter Optimization Design Method for Dual-Motor Coupled Drive System" World Electric Vehicle Journal 14, no. 10: 282. https://doi.org/10.3390/wevj14100282