Synchronizer-free gear shifting system for input shaft speed regulation for electric automobile

Abstract

The invention relates to a driving motor front-engine rear-drive automatic mechanical gearbox gear shifting system, in particular to a synchronizer-free gear shifting automatic mechanical gearbox on the basis of few-gear middle shaft active speed regulation, and belongs to the technical field of automobile control. The system comprises an input shaft, an output shaft, driving and driven gears for each gear, a spline hub, an engagement sleeve, a sensor, a speed regulating motor, a speed regulating motor transmission mechanism, a clutch operation mechanism, a gear shifting executing mechanism and a controller. The system realizes the synchronism of the engagement sleeve and a target-gear gear during the gear shifting through the regulation on the input shaft rotating speed under the condition of the motive power interruption of the speed regulating motor, a synchronizer with high requirements on materials is omitted, the cost is favorably reduced, and meanwhile, the problem that the starting and acceleration performance and the relative high-speed running of a small-size pure electric automobile cannot be simultaneously considered can be favorably solved.

Description

technical field [0001] The present invention relates to a synchronizerless shifting system for electric vehicles to adjust the speed of the input shaft, and in particular to an automatic mechanical transmission without synchronizer shifting based on the active speed regulation of a motor with fewer gears AMT), mainly for small electric vehicles with front-drive motors, belongs to the field of electric vehicle control technology. Background technique [0002] With the increasing attention to environmental issues and the extreme shortage of petroleum energy in today's society, people have invested heavily in the research and production of new energy vehicles. Among them, small electric vehicles have the advantages of zero pollution and zero fuel consumption. increasingly important role in today's society. [0003] At present, small electric vehicles have been put into use, and their structure is directly driven by a motor without a transmission. The power is directly transmit...

AI Technical Summary

Problems solved by technology

[0003] At present, small electric vehicles have been put into use, and their structure is directly driven by a motor without a transmission. The power is directly transmitted to the drive shaft through one or two stages of deceleration, which satisfies the starting and climbing performance well, but the maximum speed is affected. , and because there is no gearbox, climbing or acceleration are basically directly driven by the drive motor, the maximum torque T of the motor max and maximum speed n max High requirements, which will increase the quality, volume and cost of the motor or the whole vehicle

Or the existing electric vehicles equipped with two-speed gearboxes still have certain limitations: either starting at low speed and high torque or climbing, or driving at high speed, without intermediate normal driving speed, and the adaptability to working conditions is reduced. At the same time, the motor When running at high speed, the efficiency is greatly reduced, and the power consumption is increased; even if the second gear is set to a lower normal driving speed, it cannot satisfy the relatively high speed driving, which may also have a certain impact on traffic

If there are too many gears in the gearbox, the structure will become complicated, and the volume and mass will inevitably increase, which conflicts with the design concept of small electric vehicles

Existing electric vehicles use traditional mechanical structure synchronizers 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. However, the requirements for the manufacturing materials of the synchronizer are high, which increases the cost. tall and complex

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