机械式自动变速器的换挡控制

机械式自动变速器为非动力换挡,换挡品质是AMT换挡控制的关键.分析了换挡过程的控制策略对换挡品质的影响.在恢复动力过程中,离合器在同步时刻主从动盘转速差的变化率与车辆加速度的突变量成正比.车辆加速度变化较大时会引起使乘员感到不舒适的车辆冲击和振荡.笔者提出了通过发动机和离合器的协调控制使同步时刻离合器主从动盘转速差的变化率小于设定范围的控制策略.道路试验表明,该控制策略改善了换挡品质.

Shift Control for Automated Mechanical Transmission

The gearshift of an automated mechanical transmission is performed by cutting off the power.The key to the gearshift of AMT is shift quality.Theinfluence of the control stategy during shifting processon shift quality is analysed.While resuming the power,the derivative of the speed differencebetween the clutch active disc and the clutch slave disc time instant is in direct proportion tothe discontinuity of the vehicle acceleration at the lock-up time instant.The large discontinuity of the vehicle acceleration will result in the jerk and the oscillation of vehicle that make passengers uncomfortable.A control stategy is proposed,that make small the derivative of the speed differencebetween the clutch active disc and the clutch slave disc by the integrated control of engine and clutch.The road test shows that the control stategy improves the shift quality.