A Shift Control Method Based on Acceleration Compensation

Abstract

The invention relates to a gear-shifting control method based on acceleration compensation. The gear-shifting control method based on acceleration compensation is characterized in that gear shifting is completed according to the following steps: firstly, obtaining a current output shaft rotating speed V according to an output shaft rotating speed sensor, and calculating output shaft rotating speed acceleration a meeting the equation that a=dV / dt according to a time period t; secondly, calculating clutch oil filling time Tfill and torque swap time Tswap during gear shifting under different conditions, and calculating compensation time T meeting the equation that T=Tfill+Tswap; thirdly, obtaining a compensated estimated output shaft rotating speed V' meeting the equation that V'=V+deltaV; fourthly, obtaining gear shifting points Vup and Vdown according to the current accelerator opening degree and the current gear; and fifthly, judging whether a whole vehicle reaches the gear shifting points or not, and reminding gear shifting when V' is larger than Vup or V' is smaller than Vdown. The gear-shifting control method based on acceleration compensation aims to solve the technical problem that in the gear shifting process, the gear shifting points elapse due to change of the output shaft rotating speed within the clutch oil filling time and the torque swap time, so that the whole vehicle completes gear shifting just at the gear shifting points, and the economical efficiency and power performance of the whole vehicle are improved.

Description

technical field [0001] The invention relates to a shift control method based on acceleration compensation, which belongs to the field of shift control of automatic transmissions. Background technique [0002] The intelligent shifting strategy aims at the best economy or power, and determines the best shifting schedule according to the engine's universal characteristic curve, combined with the vehicle's operating conditions, driver's intentions and real-time road conditions. The traditional shift schedule mainly determines the shift point based on the output shaft speed and the throttle opening. When the output shaft speed reaches the shift point, the shift point is prompted to achieve the best economical or dynamic effect. [0003] The traditional calculation of shifting schedule does not consider the time factor in the shifting process, so there will be a deviation between the target shifting speed and the actual shifting speed, and the optimal design goal cannot be achieve...

AI Technical Summary

Problems solved by technology

[0003] The calculation of the traditional shift schedule does not consider the time factor in the shift process, so there will be a deviation between the target shift speed and the actual shift speed, and the optimal design goal cannot be achieved.

However, in the actual wet dual clutch automatic transmission, during the shifting process, the clutch needs to be filled with oil and then the torque is exchanged. This process needs to wait for a certain period of time.

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