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1.前言在汽油机试验研究过程中,点火提前角对于汽油机性能和燃烧产物的排放浓度都有影响.因此,点火提前角的测定是非常重要的项目.一般多采用闪频仪来观察点火提前角,其缺点是容易造成人为误差.相比之下,若采用脉冲信号计数进行数字处理,则不仅可以提高测量精度,而且能够避免闪频仪法的缺点.然而,脉冲信号数字处理法一定要有上止点脉冲和曲轴转角脉冲信号.为此,需要采用回转编码器.最近大多数汽车上装有带微处理机的发动机,为了精确控制点火提前角,研制出内装回转编码器的配电盘.如将它作为点火提前角测量仪的输入的话,不仅可供研究用,而且也可用于车辆检查.
1. Introduction In the process of petrol engine test, ignition advance angle has influence on gasoline engine performance and emission concentration of combustion products, therefore, the determination of ignition advance angle is a very important project.Generally, the use of flash instrument to observe ignition advance angle , The disadvantage is easy to cause human error.In contrast, the use of pulse signal counting for digital processing, not only can improve the measurement accuracy, but also to avoid the shortcomings of the flash spectrometer method However, the pulse signal digital processing method must have Top dead center pulse and crank angle pulse signal.Therefore, the need for rotary encoders.Most of the recent car equipped with a microprocessor-based engine, in order to precisely control the ignition advance angle, developed a built-in rotary encoder switchboard. It is not only available for research purposes but also used for vehicle inspection as an input to the ignition lead angle gauge.