Fig 1.
Overall configuration of dual-motor electric tractor.
1. Power battery 2. Traction motor 3.PTO motor 4~11. Transmission gear pair gear 12.Synchronizer one 13.Synchronizer two 14.Power coupling device 15. PTO 16. Central transmission device.
Fig 2.
Power flow under different driving modes.
(a) Power flow in single-motor drive mode. (b) Power flow in dual-motor coupling drive mode. (c) Power flow in dual-motor coupling rotary tillage mode.
Table 1.
Main technical parameters of the reference tractor.
Fig 3.
(a) Traction motor. (b) PTO motor.
Table 2.
The main parameters of the motor.
Fig 4.
The flow chart of instantaneous optimization solution.
Fig 5.
The flow chart of drive system parameter optimization.
Fig 6.
Variation curves of operating speed and traction resistance under plowing conditions.
Fig 7.
Two motor operating points of four methods under plowing conditions.
(a)Working point of traction motor. (b) Working point of PTO motor.
Fig 8.
Power consumption of four methods under plowing conditions.
Fig 9.
Power battery SOC of four methods under plowing conditions.
Table 3.
Parameters of power battery and power coupling device obtained by different methods.
Fig 10.
Torque and tachograph of the PTO.
Fig 11.
Two motor operating points of four methods under rotary tillage conditions.
(a)Working point of traction motor. (b) Working point of PTO motor.
Fig 12.
Power consumption of four methods under rotary tillage conditions.
Fig 13.
Power battery SOC of four methods under rotary tillage conditions.
Table 4.
Parameters of power battery and power coupling device obtained by different methods.