Dual-motor drive system and control method thereof

Abstract

The invention discloses a dual-motor drive system and a control method of the dual-motor drive system. The dual-motor drive system comprises a first drive motor, a second drive motor, a first input shaft, a second input shaft, a power output mechanism, a first-gear driving gear, a first-gear gear clutch, a second-gear driving gear and a second-gear gear clutch, wherein the first input shaft and the second input shaft are coaxially arranged, the first input shaft is sleeved with the first-gear driving gear without contact, the first-gear gear clutch is fixedly connected to the first input shaft, the second input shaft is sleeved with the second-gear driving gear without contact, the second-gear gear clutch is fixedly connected to the second input shaft, the first input shaft is fixedly connected with the first drive motor, the second input shaft is fixedly connected with the second drive motor, and the first-gear driving gear and the second-gear driving gear are both fixedly connected with the power output mechanism. Efficient power output without power interruption is conducted in various power coupling modes, the drive states of the motors and the gear of a gearbox are selected according to the vehicle running condition, the motors are in efficient areas all the time, so that power compensation is conducted in the gear shifting process, and the purpose that power is output without interruption is achieved.

Description

technical field [0001] The invention relates to the field of new energy vehicles, in particular to a dual-motor drive system and a control method thereof. Background technique [0002] Pure electric vehicles are developing rapidly in the industry due to their energy saving and environmental protection features. This type of vehicle will definitely change the existing energy structure. [0003] There are a variety of technical routes in the existing pure electric vehicle drive scheme. There is a drive system that uses a single motor and a single-stage reducer. This drive system does not have a gearbox with a variable speed ratio. Adjust the speed of the motor to achieve vehicle speed regulation. This kind of drive system has obvious disadvantages: it cannot take into account the maximum gradeability and maximum speed, and cannot make full use of the high-efficiency area of ​​the motor; It can make better use of the high-efficiency area of ​​the motor and increase the mileage...

AI Technical Summary

Problems solved by technology

[0003] There are a variety of technical routes in the existing pure electric vehicle drive scheme. There is a drive system that uses a single motor and a single-stage reducer. This drive system does not have a gearbox with a variable speed ratio. Adjust the speed of the motor to achieve vehicle speed regulation. This kind of drive system has obvious disadvantages: it cannot take into account the maximum gradeability and maximum speed, and cannot make full use of the high-efficiency area of ​​the motor; It can make better use of the high-efficiency zone of the motor and increase the mileage of the vehicle

Among them, the matching gearboxes have a variety of structural forms, including AMT schemes, DCT schemes, AT schemes, etc., and the AMT transmission scheme has the disadvantage of power interruption; DCT and AT transmissions contain friction elements such as clutches and synchronizers inside, which greatly reduces the gearbox. transmission efficiency

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