公开(公告)号：US20120304779A1

公开(公告)日：2012-12-06

申请号：US13482873

申请日：2012-05-29

申请人： Yoshiharu ONO ,  Osamu KARINO ,  Yoshihiro SHIMIZU ,  Yoshihiro MIYAGAWA ,  Hiroyuki KAWAJIRI ,  Takehiro FURUKAWA

发明人： Yoshiharu ONO ,  Osamu KARINO ,  Yoshihiro SHIMIZU ,  Yoshihiro MIYAGAWA ,  Hiroyuki KAWAJIRI ,  Takehiro FURUKAWA

IPC分类号： G01F1/56

CPC分类号： G01F1/075 ,  G01F15/068

摘要： An electronic flow meter includes a magnetic sensor, phase-A and phase-B drivers, a phase-A comparator, a phase-B comparator, a two-phase encoder, and a rotational speed timer. The two-phase encoder determines a normal/reverse direction where the impeller is rotated based on event signals sampled by the phase-A and the phase-B comparators, respectively, causing a counter to count up or to count down according to the normal/reverse direction as determined, thereby outputting an event count signal. The rotational speed timer calculates a rotational frequency of the impeller from the event count signal outputted by the two-phase encoder and sets frequencies of respective sampling signals of the phase-A and the phase-B comparators at a time when the rotational frequency of the impeller is measured next, and respective drive periods of the phase-A and the phase-B drivers in accordance with the rotational frequency of the impeller as calculated.

摘要翻译： 电子流量计包括磁传感器，A相和B相驱动器，A相比较器，B相比较器，两相编码器和转速计时器。 两相编码器基于由相位A和相位B比较器采样的事件信号分别确定叶轮旋转的正/反方向，使得计数器根据正常/反相计数器向上计数或倒计数， 由此输出事件计数信号。 旋转速度计时器根据由两相编码器输出的事件计数信号计算叶轮的旋转频率，并设定相位A和相位-B比较器的各个采样信号的频率， 叶轮，根据计算出的叶轮的转速，相位-A和相位B驱动器的驱动周期相应地被测量。