重型矿用汽车多参数动力性换挡规律

基于矿用汽车载荷变化大、行驶环境多变、油门变化频繁的特点，依据重载爬坡和轻载下坡的典型工况，制定了重型矿用汽车多参数动力性换挡策略.利用函数叠加法建立康明斯QSL-FR91674型发动机全特性曲线，得到不同油门开度情况下发动机输出转速与输出转矩的表达式.根据发动机输出动力特性，计算得到3550型矿用汽车车速、油门开度和加速度三参数动力性换挡规律.再结合道路状况识别方法、车辆载荷、驾驶员操作意图，针对轻载下坡和重载爬坡工况，修正得到重型矿用汽车多参数动力性换挡规律.在Maplesim中建立换挡模型，通过仿真计算，得到修正前后车辆轻载下坡路况时挡位和车速变化曲线，后者避免了不必要的换挡，保证了车辆的动力性能.

Powerful Shifting Strategy and Multi parameters Considered for Heavy Duty Mining Truck

The powerful shifting strategy considering multi parameters for mining truck was set up based on the weight， working condition and change rate of throttle angle， uphill with overload and downhill with empty load. The full field performance function of diesel engine Cummins QSL FR91674 was established by the superposition method. In addition， the relationship between engine speed and output torque in different throttle angles was shown by this function. Based on the engine dynamic performance， the powerful shifting strategy of vehicle speed， throttle angle and vehicle acceleration was designed for the mining truck named 3550. The strategy was further optimized combining the identification method for road condition， the state of vehicle load， and the driver intentions. The power train system simulation model was established in Maplesim， and simulation results represent that the optimized strategy can precaution unnecessary shift and improve the dynamic performance for vehicle.