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建立了某综合传动装置可闭锁式液力变矩器3种不同工作状态的数学模型及闭锁离合器的控制油压充放油模型,应用Matlab软件建立了仿真模型。针对液力变矩器不同闭锁时机对传动系统动态特性的影响进行了仿真研究。由仿真分析表明,不同的闭锁时机对车辆的平均加速度影响不大,但Ⅲ挡以后早闭锁比晚闭锁的加速特性稍好一些。换挡时不解锁液力变矩器,由于换挡离合器中的缓冲离合器作用,传动装置输出端的动载系数没有明显的变化。不解锁闭锁离合器进行换挡会造成缓冲离合器滑摩功大幅度增加。在缓冲离合器控制油压未达到其最大值且离合器未同步时闭锁液力变矩器也使缓冲离合器的滑摩功有所增加,但增加的幅度不大。
The mathematic model of three kinds of working states of lockable torque converter and the model of hydraulic oil charge and discharge of the lock-up clutch were established. The simulation model was established by using Matlab software. Aiming at the influence of different lockup moments of torque converter on dynamic characteristics of transmission system, a simulation study was carried out. The simulation analysis shows that different locking timing has little effect on the average acceleration of the vehicle, but the early locking after the third gear is slightly better than that of the late locking. When shifting, the hydraulic torque converter is not unlocked. Due to the effect of the damping clutch in the shifting clutch, the dynamic load factor at the output of the transmission does not change significantly. Not unlock the lock clutch for shifting will result in a substantial increase in the friction of the clutch friction. Clutch hydraulic clutch torque control does not reach its maximum value and the clutch is not synchronized block torque converter also make the friction clutch frictional power has increased, but increased marginally.