【摘要】 设计了一种高速汽油机循环内转速波动实时测量系统 ,采用专门设计的光电轴角编码器获取曲轴转角信号 ,辅助以点火脉冲感应信号来判定上止点位置。采用计算机DMA数据传输技术 ,配以 70MHz记数器实现任意转速下的循环内转速波动测量 ,并采用数字低通滤波器处理高频干扰信号。更多还原

【Abstract】 A real-time in-cycle speed fluctuation measurement system has been designed for high-speed gasoline engines by using a specially designed optic electric angle encoder to gain the crankshaft angular signal and an ignition induction signal to ensure the TDC plsition. By using the DMA method with a 70MHz counter and a data transfer, the in-cycle speed fluctuation at any engine speeds is measured, while the low-pass algorithms are used to eliminate the high frequency interference signal.更多还原