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为提升液力机械式自动变速器的换挡品质,研究一种综合考虑发动机降扭协调和电磁阀占空比优化的换挡过程控制策略。分析换挡过程传动比,得出涡轮转矩大幅度升降阶段对应为惯性相阶段。通过CAN通信实现换挡过程发动机降扭协调,提高惯性相阶段液力变矩器传动比,消除升挡过程涡轮输出转矩大幅度升、降现象。通过标定试验车辆换挡控制电磁阀占空比,总结出换挡过程电磁阀占空比对换挡冲击度的影响。设计分阶段换挡控制流程,优化比例电磁阀占空比曲线;采用嵌入式编程,以自制变速器控制器替代原车控制器,实车验证控制策略的有效性。
In order to improve the shift quality of hydromechanical automatic transmission, a shift control strategy considering engine torque reduction coordination and solenoid valve duty cycle optimization is studied. Analysis of the gear ratio during shift process shows that the stage of turbine torque rise and fall corresponds to the phase of inertial phase. Through CAN communication, it can reduce the torsion and coordination of the engine in shift process and improve the transmission ratio of the torque converter in the inertia phase, so as to eliminate the phenomenon that the output torque of the turbine increases or decreases significantly in the process of upshifting. By calibrating the duty cycle of the test shift control solenoid valve, the influence of the duty cycle of the solenoid valve on the shift impact degree was summarized. The shift control process is designed in stages, and the duty cycle of the proportional solenoid valve is optimized. The embedded controller is used to replace the original controller with a homemade transmission controller. The real vehicle is used to verify the effectiveness of the control strategy.