在长时间行驶后将车停下熄火，站在车外总会听到一些奇怪的声音，例如叮叮、哒哒、啪啪、咔嚓、咔嗒等声响。我的一个朋友就遇见了这种声音，为此非常苦恼，打电话求助于我，她认为这样的声音并不正常，会导致车辆发生爆炸或者自燃。
其实并不然，有些声音是事实存在且正常的，而有的或许是有些许故障的，但也不会使车辆发生自燃或爆炸。我相信你也遇到过这种情况，今天咱们就来大概讲解一下。
大多数固有思维定式的认为，车子都熄火停车了，怎么会发出异响呢？其实车子熄火停车后，车子部分电子设备还将会进行工作一段时间，一些金属结构还会进行冷却，所以也就有发出异响的条件了。
首先第一个就是排气系统冷却的时候会产生异响，一般状况下在冷车怠速的时候排气管就会产生200多的温度。如果发动机在长时间运转或混合气在排气管燃烧的情况下，排气管有大量的高温气体排出来，如果这时将车辆熄火，排气管就会逐步冷却，这时在排气中的前端、隔热垫以及软连接处就受到热胀冷缩的原理发出异响，如果熄火停车后出现这种声音属于正常现象，不必过多的担心。
还有就是车辆上排气系统使用的材质不同，也会导致产生异响的声音大小有所不同，如果是铸铁材质的排气管，声音相对会更响一点，要是合金材质的，声音会有所好转。除此排气系统以外，三元催化器也会产生相对的异响。
三元催化器学名叫做“催化转换器”，其作用就是将排气中的二氧化碳、二氧化硫、碳氢化合物三种有害成份进行过滤的重要部件，是安装在汽车排气系统中最重要的机外净化装置，如果你身边有人爱改装车将三元催化进行移除的话，你会闻到排气中带有特别刺鼻的臭味。
在车辆发动时它一直在默默工作，其工作温度是在非常高温的状态下，可以达到400-800℃的范围，发动机突然熄火，三元催化器不再工作，内部的金属结构及部件同样会受到热胀冷缩的原理，从而产生异响。值得一说的是正因为工作与不工作时的温差相差过高，它产生的异响声音非常大，所以很多不明真相的吃瓜群众一度会认为车辆马上要发生自然或者爆炸，这个声音也就是“罪魁祸首”。
还有部分车型的风扇会在熄火后仍会努力工作，对车内部件进行强制降温，高速运转时也会发出声音， 这也是属于正常现象。还有就是有些车型在停止工作后，涡轮会进行冷却也会产生异响，综上所述这些机械结构都会受到热胀冷缩的原理发出异响均为正常状态，并不要觉得这是爆炸的前奏然后慌了神儿。
友情提示一下，车辆发生异响后不要想着打开机盖探索，更不要好奇的去抚摸车内的金属部件，不然你会像我一样仅用一只手敲打出这么多字。对了，上述的这些知识点基本出现在燃油类车型上，如果你购买的是新能源非燃油类车型，在停车时出现各种一样的话，我建议还是去专业店面进行检查一番吧。
（本文部分资料及图片来源于网络，如有侵权请联系我们）
原创文章，作者：cesifu，如若转载，请注明出处：http://www.cesifu.com/article/38777.html
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