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自动变速器升挡过程惯性相发动机协调控制 总被引:1,自引:0,他引:1
发动机协调控制是提高换挡品质的必要技术手段。分析换挡过程输出轴转矩波动与换挡品质的关系,基于液力变矩器模型设计出输出轴转矩观测器,制定出基于转矩的升挡过程惯性相发动机协调控制策略,在DEUTZ BF4M1013单体泵柴油机和Allison S2000离合器—离合器换挡式液力自动变速器组成的动力传动系统台架上,进行基于转矩的1-2升挡过程惯性相发动机协调控制试验研究。试验结果表明,单体泵柴油机的转矩响应能够满足换挡过程协调控制的要求;基于转矩的换挡过程发动机协调控制能够有效地减小输出轴转矩波动,提高换挡品质。 相似文献
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In order to improve the shift quality, a linear quadratic optimal tracking control algorithm for automatic transmission shift process is proposed. The dynamic equations of the shift process are derived using a Lagrange method. And a powertrain model is built in the Matlab/Simulink and verified by the measurements. Considering the shift jerk and friction loss during the shift process, the tracking trajectories of the turbine speed and output shaft speed are defined. Furthermore, the linear quadratic optimal tracking control performance index is proposed. Based on the Pontryagin's minimum principle, the optimal control law of the shift process is presented. Finally, the simulation study of the 1-2 upshift process under different load conditions is carried out with the powertrain model. The simulation results demonstrate that the shift jerk and friction loss can be significantly reduced by applying the proposed optimal tracking control method. 相似文献
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以玉蒙铁路钱家湾隧道、哨脚一号隧道偏压、浅埋施工为例,首先论述了监控量测在隧道施工中的作用和技术要求,然后针对监控量测在偏压、浅埋隧道施工中的方法作了详细的介绍,并强调了监控量测技术在隧道施工中的重要作用。 相似文献
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从一起仓库火灾事例入手,说明了火灾的基本情况、调查访问情况及现场勘验情况,详细介绍了起火部位、起火点的认定依据,通过火灾技术鉴定,印证调查结论,剖析火灾原因的认定过程,并结合调查中遇到的问题,总结了此次火灾事故的教训。 相似文献