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喷油嘴的原理:</STRONG></SPAN> 喷油嘴其实就是个简单的电磁阀,</SPAN>当电磁线圈通电时,</SPAN>产生吸力,</SPAN>针阀被吸起,</SPAN>打开喷孔,</SPAN>燃油经针阀头部的轴针与喷孔之间的环形间隙高速喷出,</SPAN>形成雾状,</SPAN>利于燃烧充分.</SPAN> 喷油量多少的控制:</SPAN>同一类型的电喷车,</SPAN>汽油泵的压力是恒定的,</SPAN>不论节气门的开度大小,</SPAN>只要经过燃油压力调节器的调节,</SPAN>喷油嘴的压力始终都是恒定的.</SPAN>喷油嘴是和燃油泵及燃油压力调节器严格配套使用的,</SPAN>只有设计的压力,</SPAN>喷油嘴才能达到最佳的雾化效果,</SPAN>压力低于设计压力，喷出的油不是雾状，呈柱状，不宜与空气混合；压力过大，喷出的油呈圆锥面形状，也不易混合，并且喷射的力量太大，很多的燃油直接就喷到管壁上，直接影响混合比参数。不论是加速还是怠速,</SPAN>压力都应当恒定.</SPAN>不同的车型压力也各不相同.(</SPAN>有朋友提到的清洗机的几挡选择,</SPAN>其实是针对不同车型的压力选择,</SPAN>并不是加速怠速的压力不同,</SPAN>错误选择了喷油压力,</SPAN>喷油嘴雾化不良).</SPAN> 喷油量的多少,</SPAN>取决于喷油时间的长短,</SPAN>喷油器按电磁线圈的控制方式不同,</SPAN>分为电压驱动式和电流驱动式两种,</SPAN>电压式也分低阻和高阻的,</SPAN>高阻的可以接12V</SPAN> 电,</SPAN>低阻的只能接低电压,</SPAN>错接在12V</SPAN>上时间稍长会烧线圈.</SPAN>喷油时,</SPAN>电脑提供的电压是恒定的,</SPAN>比如说12V,</SPAN>断油时马上变为0V,</SPAN>这个变化是瞬时的,</SPAN>就像是电脑语言里面的0</SPAN>和1</SPAN>一个概念,</SPAN>中间没有0.5</SPAN>之说.</SPAN>换言之,</SPAN>这是一个脉动的直流电信号.</SPAN>并非什么交流电等等一类的名词,</SPAN>交流电什么概念呢?</SPAN>正负交错才叫交流电.</SPAN>好像汽车里面除了发电机整流器以前的部分,</SPAN>基本上接触不到交流电.</SPAN> 当喷油嘴堵塞时,</SPAN>喷油不畅,</SPAN>或者喷油嘴间隙有积碳及胶合物,</SPAN>达不到设计的喷油量或雾化效果,</SPAN>才需要清洗.</SPAN></SPAN> Injector principle:</SPAN></SPAN> Injector is a simple fact of the solenoid valve, when the electromagnetic coil power, the resulting suction, needle being sucked on, open the nozzle, fuel by the valve pin with the head of the axis of the annular nozzle gap between the emission of high-speed, the formation of mist, in favor of the full combustion. the number of fuel injection quantity control: the same type of EFI vehicles, fuel pump pressure is constant, regardless of the size of throttle opening, as long as the fuel pressure regulator after the adjustment, the fuel injector has always been a constant pressure. injector is fuel pump and fuel pressure regulator supporting the use of strict, and only the design of the pressure nozzle atomization in order to achieve the best results, the pressure is lower than the design pressure, the oil is not out mist, was cylindrical, should not be mixed with air; pressure, oil smoke呈圆cone shape and are not easy to mix and strength of spray too much, a lot of fuel sprayed directly on the wall, the direct effects of mixing ratio parameters. Whether to accelerate or idle, the pressure should be constant. Different models vary the pressure. (A friend of mine mentioned a few block washing machine choice, in fact the pressure for different models to choose, not the pressure to speed up idle different, chosen the wrong fuel injection pressure, nozzle atomization bad). the amount of fuel injection, depending on the length of the fuel injectors, injector control by electromagnetic coils in different ways, driven into voltage and current-driven are also sub-voltage type of low resistance and high resistance, high resistance can take the 12V power, low resistance then the only low-voltage, wrong time to take a little 阅读全文>> |
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