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介绍了发动机控制中凸轮与曲轴盘信号的获取方法。采用合理性判别机制,把发动机信号盘的齿型系数固化到RO M中,在发动机运行过程中,采集凸轮齿、曲轴齿单齿齿宽时间,通过相邻齿之间的比值对正常齿、缺齿、多齿信号之外的高频干扰信号、丢齿信号问题进行滤波处理。在发动机工作转速范围建立曲轴信号、凸轮信号各个齿型的相邻齿齿宽比例系数MAP图,依照最大转速变化率,通过理论分析计算出单齿齿宽比例的上、下边界;同时在发动机台架上,对多转速工况下的齿型宽度信号进行测试记录,修正齿宽比例的合理性系数边界值,得出凸轮轴正常齿、多齿以及曲轴正常齿、缺齿的合理性系数,完成发动机控制同步信号的可靠获取。 相似文献
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22MnB5 is one of the most typical hot stamping boron steels. In order to study the effect of austenitizing temperature and
holding time on the mechanical properties of hot stamping boron steel 22MnB5, a series of quenching process are done. The
tensile strength and hardness of 22MnB5 samples are measured. The results show that 22MnB5 has a good quenching performance,
and the tensile strength and hardness of samples quenched in a water-cooled steel die are similar to those of water quenching.
The higher tensile strength and HRC hardness are achieved when austenitizing at temperatures of 880–910 °C. Holding at 910
°C for 5 min and then quenching gives rise to a better combination of tensile strength, hardness and ductility. 相似文献
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