For the purpose of engineering development for a new 8-step speed automatic transmission,a simplified dynamic model for this gearbox was established and key parameters which affected the shift quality were analyzed.Ai...For the purpose of engineering development for a new 8-step speed automatic transmission,a simplified dynamic model for this gearbox was established and key parameters which affected the shift quality were analyzed.Aiming at four different shift types,the ideal characteristics of shift clutch and engine control were set up.By using torque estimation method,PI slip control algorithm and engine coordinated control principle,the control model and transmission controller were well developed for three shift phases which included rapid-fill phase,torque phase and inertia phase.The testing environment on the rig and prototype vehicle level was built and the testing results obtained in ultimate condition could verify the accuracy and feasibility of this shift control strategy.The peak jerk during shift process was controlled within ±2 g/s where the smooth gearshift was obtained.The development proposal and algorithm have a high value for engineering application.展开更多
基金Project(51105017) supported by the National Natural Science Foundation of ChinaProject(2011BAG09B00) supported by the National Science and Technology Support Program of ChinaProject(2010DFB80020) supported by the Technology Major Project of the Ministry of Science and Technology of China
文摘For the purpose of engineering development for a new 8-step speed automatic transmission,a simplified dynamic model for this gearbox was established and key parameters which affected the shift quality were analyzed.Aiming at four different shift types,the ideal characteristics of shift clutch and engine control were set up.By using torque estimation method,PI slip control algorithm and engine coordinated control principle,the control model and transmission controller were well developed for three shift phases which included rapid-fill phase,torque phase and inertia phase.The testing environment on the rig and prototype vehicle level was built and the testing results obtained in ultimate condition could verify the accuracy and feasibility of this shift control strategy.The peak jerk during shift process was controlled within ±2 g/s where the smooth gearshift was obtained.The development proposal and algorithm have a high value for engineering application.
文摘为解决先进计算电信架构(Advanced Telecom Computing Architecture,ATCA)设备监测系统中存在的控制板卡自主可控度低、监测范围有限、部署实施难度大、运维成本高等问题,在实现智能平台管理控制器(Intelligent Platform Management Controller,IPMC)自主可控及监测界面设计的基础上,提出将现网中ATCA监测系统结构与近年备受关注的低功耗广域网(Low Power Wide Area Network,LPWAN)中的窄带物联网(Narrow Band Internet of Things,NB-IoT)技术相结合。通过对3种NB-IoT应用方案进行对比分析,结合目前现实情况,提出一种快速无线组网的可行方案,并基于此方案设计出一种能够进行数据处理及转发的传输节点,实现了智能平台管理接口(Intelligent Platform Management Interface,IPMI)消息在机箱管理控制器(Shelf Management Controller,ShMC)节点与NB-IoT模组之间的高效数据传输。
