高速汽油机示功图计算机测量系统研制  

Development of indicator diagram measurement system for high speed gasoline engines

作　　者：吴锋[1] 黄琪[1] 朱建新[1] 胡章其[1] 

机构地区：[1]浙江大学机械与能源工程学院,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2002年第6期690-693,共4页Journal of Zhejiang University：Engineering Science

摘　　要：为了解决常用的测量系统采样和数据传输速度慢的问题,设计了一种高速汽油机示功图测量系统,采用计算机DMA数据传输技术,配以高速高精度A/D转换器实现在任意转速下缸内压力的测量,每循环测量720点的缸内气体压力.采用专门设计的光电轴角编码器获取曲轴转角信号和上止点信号,辅助以点火脉冲感应信号来确定信号时序.最后,对测得的示功图进行了均化处理.系统完成一次采样和数据传输的时间小于5μs,完全可以满足高速汽油机缸内压力测量的要求.An indicator diagram measurement system for high-speed gasoline engine was developed. In order to overcome the shortcomings of slow sampling and data transfer of the traditional system, DMA data transfer technology and high-speed A/D chip with high accuracy were applied. In each working cycle, 720 pressure signals were sampled. An optic-electric angle encoder was used to obtain the crank angular signal, the TDC position signal accompanied by an ignition induction signal, from all of which the accurate phase of the signal was fixed. Because the time for sampling one signal was shorter than 5 μs, the system can be used to measure the indicator diagram of high speed gasoline engines.

关 键 词：高速汽油机 示功图 计算机测量系统 计算机DMA数据传输技术 A/D转换器 

分 类 号：TK411.27[动力工程及工程热物理—动力机械及工程]