机械式自动变速器同步过程的控制策略研究

Research on Control Strategy about Synchronous Process for Automatic Mechanical Transmission

详细阐述锁环式同步器的工作原理,并分析机械式自动变速器同步过程的各个阶段的工作过程,基于离散化PID控制原理,提出同步过程三个阶段的相应控制策略,并采用冲击度作为评价标准。最后,通过台架试验验证提出的控制策略的可行性。试验数据表明,该控制策略可以在保证冲击度要求的前提下,满足所限定的同步时间,改善换档的平稳性与舒适性,减少同步环的磨损,增加同步器的使用寿命。

The working principle of lock ring synchronizer was expounded and the synchronous working process of automatic mechanical transmission（AMT） at each stage was analyzed in this paper.Based on the control principle of discrete PID,the corresponding control strategy to three stages was proposed.Then,the degree of jerk when starting of motor vehicle was used as an evaluation criterion.Finally,the bench tests were carried out to verify the feasibility of the proposed control strategy.The experimental results indicate that the control strategy can ensure the demand of jerk,meet the limited synchronous time,improve the smoothness and comfort of gear shift,reduce the wear of the synchronizing ring and increase the lifetime of synchronizer.