液力机械式自动变速器换挡控制及实车验证

Shifting Control of Automatic Transmission and Real-vehicle Validation

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 automatic transmission, a shift control strategy which take both the engine torque reduce coordination and optimize the solenoid vale duty cycle curve into consideration was pro- posed. Based on the transmission ratio, conclude that the turbine torque＇s frequent fluctuation phase is inertia phase. Using CAN communication to achieve engine coordinate control by torque reduce, raise the transmission ratio of the hydraulic torque converter during inertia phase, eliminate the frequent fluctuation phenomenon of the turbine torque. Calibration the duty cycle of the shift control solenoids summarized the impact on jerk caused by different duty cycle during shifting process. Execute the shifting process by different shifting phase to optimize the duty cycle curve. By embedded programming, replace the original controller with self-made controller, verify the control strategy.