重型行星式自动变速器换挡过程控制策略

为提高重型越野车辆的性能，改善车辆换挡品质，对其搭载的重型行星式自动变速器进行了详细分析，在此基础上建立了3自由度行星变速器的运动学模型.通过分析变速器电液操控系统，采用融合涡轮转速和输出轴转速的换挡离合器滑差作为控制参数，进而制定相应的换挡过程控制策略，并采用陀螺仪测量加速度信号微分的方法进行变速器换挡冲击度的分析评价.通过实车验证，能够实现重型行星式自动变速器良好的换挡过程控制，试验对比发现，基于离合器滑差的换挡过程控制试验结果优于传统基于涡轮转速的换挡过程控制试验结果. 

Shifting Control of Heavy-Duty Planetary Transmission

To improve the vehicular shift quality and the heavy off-highway vehicle''s performance, the vehicular equipped heavy-duty planetary transmission was analyzed, and a kinematic model of the testing automatic transmission with three degree of freedom was established. Then a shift control strategy was developed based on analyzing for the electro-hydraulic control system of the automatic transmission, and taking the shift clutch slipping which fused the turbine speed and the transmission output shaft speed as the control parameters. The difference of the vehicular acceleration, measured by a fiber optic gyroscope installed in the vehicular crew cabin, was used to evaluate the shift quality. Finally, the proposed control strategy was thoroughly verified on a heavy off-highway vehicle, excellent shift quality was achieved with the experimented data. And the contrast test show that the shift control quality by the clutch slipping is better than that controlled with the turbine speed.