摘要
汽油机工作时会在点火线圈、高压线及火花塞周围产生脉冲磁场,若将传感器置于该磁场中可感应到点火信号,经整理可由仪表指示出;由于汽油机点火频率与曲轴转速成正比,可将表盘按转速值绘制;改进设计的电路使每次点火信号的第一个脉冲触发后,输出一个脉冲,不再响应后面到来的脉冲,并持续半个周期的时间,然后复位,用这种转速表对摩托车发动机进行测量,精度可达2.5级。
When the gasoline engine operates, impules magnetic field wilt be developed around the ignition coil, high voltage wire and spark plug. If a sensor is placed in the magnetic field, it can sense the ignition signal which can be indicated by the instrument after it has been treated. Because the ignition frequency of the gasoline engine is directly proportional to the rotation speed of the crankshaft shaft, the instrument scale can be drawn according to the value of the rotation speed. The improved circuit makes the first pulse after triggering of each ignition signal transmit output an pulse which does not response the sequential pulse and which can last half of a cycle and then reset. To measure the motorcycle engine with such speedometer makes the accuracy be of Class 2.5.
出处
《摩托车技术》
1992年第2期36-39,共4页
Motorcycle Technology
