液力变矩器闭锁过程转速调节策略研究

A Study on the Speed Governing Strategy of Hydraulic Torque Converter Lock-up Process

考虑到液力变矩器闭锁过程对动力性及闭锁品质的双重要求,提出一种基于发动机转速调节的闭锁控制策略。通过分析闭锁过程中闭锁离合器摩擦力矩和发动机惯性能量释放对闭锁冲击的影响,以闭锁离合器摩滑速度代替油门踏板位置作为柴油机调速系统输入激励,实现了闭锁过程控制。在某履带车辆上对该策略进行了实车验证,试验结果表明:基于发动机转速调节的闭锁控制策略在不损失车辆动力性的前提下能够实现更加平稳、快捷的闭锁过程。

Considering the double demands of power performance and lock-up quality for the lock-up process of hydraulic torque converter, a lock-up control strategy based on engine speed governing was proposed. Through analyzing the effects on lock-up impacts from the sliding-friction moment of lock- up clutch and inertial energy releasing of the engine, lock-up process control was realized by taking the sliding-friction velocity of lock-up clutch, instead of the position of accelerator pedal, as the input excitation of diesel engine speed governing system. The strategy was testified by an actual test with a certain tracked vehicle. The test results indicate that the lock-up control strategy based on engine speed governing can implement a smooth and fast lock-up process without losing power performance of the vehicle.