3results about How to "Improve shift smoothness" patented technology

The application discloses a kind of mechanical automatic transmission rotational speed synchronization self-adjusting predictive control method, comprising: the initial length of calculating brake combination signal sending to brake torque reaches constant value time point;Brake shaft speed drop value during brake torque constant time point is calculated to brake torque start to produce brake torque;Brake torque is zero during brake torque from constant brake torque start to reduce, and brake shaft speed drop value;According to the initial value of dynamic speed difference threshold value calculated according to the above results;Test the extreme value of brake friction plate separation torque reduction stage duration;According to the initial value of the extreme value of brake shaft speed curve parameter in separation torque reduction stage;According to the size relationship between the difference between the target speed of brake shaft before braking and current speed and dynamic speed difference threshold value, the rotational speed synchronization of transmission is controlled.The application improves control accuracy, shortens gear shifting time, improves gear shifting smoothness, enhances the robustness and stability of control method under time-varying working condition.

The invention relates to the technical field of vehicles, in particular to a transmission assembly, a drive assembly, a drive axle and a vehicle. One end of the transmission assembly is suitable for being connected with a power unit, the other end of the transmission assembly is suitable for being connected with a differential mechanism, the transmission assembly comprises a planetary structure, the planetary structure comprises a sun gear, and the sun gear is suitable for being in transmission connection with the power unit; and the gear ring surrounds the periphery of the sun gear and is in transmission connection with the sun gear, and the gear ring is connected with the differential mechanism. In the process that a planetary structure participates in gear shifting, due to the fact that the speed ratio can be designed to be small, the stage difference between a first gear and a second gear is small, and gear shifting smoothness is good, the problem that when a planetary reducer serves as a driving unit, gear shifting impact is caused by the fact that the gear shifting stage difference is large due to sun gear input and planet carrier output is solved. Therefore, according to the transmission assembly, the comfort of the vehicle can be improved.

This utility model belongs to the field of new energy vehicle power transmission technology, and discloses a single-motor two-speed electric drive axle powertrain, including a disc motor, a reducer housing, a first shaft assembly, an intermediate shaft assembly, a reducer end cover, an axle housing, a first half-shaft, a differential, a second-stage reduction passive gear, a second half-shaft, a coupling sleeve, and a differential lock assembly. This solution achieves the advantages of compact structure, short axial dimension, and high power density by adopting an integrated design of an axial flux disc motor and a two-speed reduction mechanism, which is convenient for application in vehicles with high ground clearance requirements and limited installation space. By using a ball screw type shifting actuator in conjunction with motor speed adjustment, synchronizer-free rapid shifting is achieved, improving shifting smoothness and system reliability. The hollow intermediate shaft assembly and lubrication oil passage design make lubrication efficient and the structure simplified, improving operational reliability. The rear-mounted integrated differential lock assembly enhances the ability to get out of trouble in complex road conditions and the vehicle's adaptability.