Motor and AMT (automated mechanical transmission) integration-based electric vehicle driving system and driving method

Abstract

The invention discloses a motor and AMT (automated mechanical transmission) integration-based electric vehicle driving system and a motor and AMT integration-based electric vehicle driving method. The driving system comprises a driving motor, a motor controller, a transmission drive assembly, a gear selection and shifting execution mechanism and a controller for the gear selection and shifting execution mechanism, wherein the transmission drive assembly comprises driving and driven gears of four gears, two splined hubs, two jointing sleeves and an output sensor; the driving motor is a direct current brushless motor; an output shaft of the driving motor is provided with an internal spline; a shell of the driving motor is integrally and directly connected with a transmission case through fine thread screws after being positioned through fixing pins; the output shaft, with the internal spline, of the motor is positioned in the motor; an input shaft of a transmission is directly inserted into the motor to be connected with the output shaft, with the internal spline, of the motor. According to the system, a clutch is eliminated, so that power interruption time during gear shifting is reduced, and the cost is also lowered; the jointing sleeves and the gears of a target gear can be synchronized during gear shifting by actively regulating the speed of the driving motor, and a synchronizer with high requirements on materials is eliminated from the transmission, so that the cost is further lowered.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a driving system and a driving method of an electric vehicle, in particular to a driving system and a driving method of a small pure electric vehicle with a front-drive and front-drive drive motor. Background technique [0002] As the whole society pays more and more attention to environmental issues and the problem of petroleum energy becomes more and more serious, people have invested heavily in the research and production of new energy vehicles. Among them, small pure electric vehicles have the advantages of zero pollution and zero consumption of fuel. It is playing an increasingly important role in today's society. [0003] At present, small pure electric vehicles have been put into use, and their structure is directly driven by a motor without a transmission. The power is directly output to the drive shaft through a fixed speed ratio reducer, which can ...

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Problems solved by technology

[0003] At present, small pure electric vehicles have been put into use, and their structure is directly driven by a motor without a transmission. The power is directly output to the drive shaft through a fixed speed ratio reducer, which can basically meet the requirements of low-speed starting and small-angle climbing of the vehicle, but the maximum Both the gradeability and the maximum speed of the vehicle are limited. At the same time, since there is no gearbox, the gradeability or acceleration capability is directly determined by the drive motor, and the requirements for the maximum torque Tmax and the maximum speed nmax of the motor are high, so that the quality of the motor or the entire vehicle , size and cost increase

[0004] Or existing electric vehicles with two-gear gearboxes still have certain limitations: either start or climb in first gear, or run at high speed in second gear, without intermediate normal driving gears, and the range of gear coverage is narrow. Poor adaptability to working conditions; at the same time, it is difficult for the drive motor to work in the high-efficiency zone, resulting in increased power consumption; if the second gear is set to a lower normal driving speed, it will not be able to meet the needs of the vehicle for high-speed driving, and traffic will be affected in high-speed sections. However, if there are too many gears in the gearbox, the mechanical structure will also become complicated, and the volume and mass will increase, which conflicts with the design concept of small pure electric vehicles; designing a three-speed transmission also requires gear selection and shifting It is better to make two sets of mechanisms into a four-speed transmission. In the case of adding a set of gears, the working range of the motor can be broadened, the time for speed adjustment of the motor can be shortened, and the difficulty of shifting gears can be reduced.

[0005] Existing electric vehicles adopt traditional synchronizer mechanical structure when shifting gears. Synchronization is achieved through the contact between the lock ring of the synchronizer and the conical surface of the ring gear to reduce the impact between the meshing teeth during gear shifting. The cost increases and the structure is complicated; in addition, during the gear shifting process, the synchronizer will slip due to the different speeds of the driving and driven gears, which will increase the time for the gear shifting motor to perform gear shifting and the phenomenon of motor stalling, thereby reducing the life of the motor

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