起步工况液力变矩器闭锁滑差控制及滑摩温度

Slip temperature and lock-up control of torque converter clutch under launching conditions

针对装备液力机械式自动变速器的车辆起步过程效率低的问题,提出起步工况液力变矩器闭锁离合器滑差控制技术,建立其滑差控制仿真模型,分析了不同油门开度时车辆起步性能.由于闭锁离合器滑摩时产生较大热量,容易使得摩擦衬片局部高温,建立考虑油槽结构的闭锁离合器三维瞬态热传导有限元模型,借助CFX软件,分析起步工况闭锁滑差控制时闭锁离合器摩擦片温度随时间的变化规律.结果表明:液力变矩器闭锁离合器起步闭锁滑差控制技术在不影响车辆动力性的前提下可有效解决车辆起步时效率低的问题;当进行闭锁离合器闭锁滑差控制时,摩擦片的最高温升为40℃,如果工作油温度较低,摩擦片温度在允许的范围内,可以进行起步滑差控制;但当工作油温度高于100℃时,摩擦片瞬态温度已高于130℃,此时不宜进行闭锁滑摩控制.

To solve the low efficiency of vehicle equipped with AT under launching conditions, the TCCs slip and lock-up control technology was proposed. The slip and lock-up control simulation model of TCC was established to analyze the dynamic property and efficiency under launching conditions with constant engine speed as control target. The three-dimensional transient heat conduction finite element model was built by CFX. The slipping power was calculated and converted to heat flux on the surface of TTCs fric- tion plate. The temperature of TTCs friction plate was obtained at different ATF oil temperature. The si- mulation results show that the TCCs slip and lock-up control technology under launching conditions can effectively solve low efficiency of vehicles caused by torque converter. The maximum rising temperature of TCCs friction plate is 40 ℃. The TCCs slip and lock-up control can be realized within the allowable tem- perature range of TTCs friction plate when the ATF oil temperature is low. The TCCs slip and lock-up control is not suitable because the high temperature of TTCs friction plate exceeds the allowable range when the ATF oil temperature reaches 100 ℃.