汽车故障诊断分析
轿车的故障涉及全车各部位，情况纷繁复杂，有时很难确定，故障的发生多取决于产品质量。可靠性高的产品出现的故障往往容易找到，而产品质量有缺陷的车，因为使用材料、加工工艺等方面的原因，故障部位常常很伤脑筋。如果我们采用故障概率分析法，按顺序排列，就会容易得多。
高级轿车故障多种多样，故障部位几乎涉及全车各部位、机械、电气、油、气等各方面故障纷繁复杂，在故障判断方面如若没有一个科学合理的判断方法，则很难迅速地确定故障所在部位。对于汽车这样一个复杂系统，发生故障的可能性主要取决于产品质量。可靠性高的产品其出现故障的部位往往是正常思维可以想到的；而产品质量有缺陷的车型，因为使用材料、加工工艺等方面的问题，故障部位往往出现在人们正常思维无法想到的地方，当然这种情况也并非是绝对的。下面几例实例则可以说明这种情况，我们在列出故障概率的时候，采用按顺序排列的方法，即从可能性大的部位、原因排列。
一辆奔驰560SEL轿车因气门异响更换新摇臂后出现怠速剧烈抖动的情况。按照一般思维过程，只拆装过摇臂、凸轮轴，查找故障应当首先考虑这几个部位，如果顺着这条线索查找下去，也许很快就可以排除故障。但遗憾的是修理工在断火试验时发现至少有三个缸工作不良，他当然想到只更换了一个缸的摇臂，即便是有故障也不会引起这三个缸都不工作，故障原因可能在于其他方面。根据经验，可能原因排列如下：
(1)废气再循环(EGR)系统故障，废气大量进入气缸(此项可能性最大)。
(2)进气系统漏气，混合气太稀，怠速工作不良(此项可能性居中)。
Fault diagnosis of car
Car Fault location of the car involved in the whole situation complicated, it is sometimes difficult to determine, the fault occurred on product quality. High reliability of our products are often easy to find fault, and the product quality defective vehicles, because of the use of materials, processing technology, and other aspects, fault position, are often troubled. If we adopt failure probability analysis, according to the order, will be much easier.
Luxury Car Fault varied, fault position, involving almost all the car parts, machinery, electrical, oil, gas and other areas failure complicated, in fault judgement if not a scientific method of reasonable judgement, it is hard to quickly identify faults of the site. For such a complex vehicle systems, the possibility of failure depends largely on the quality of products. Its high reliability failure of the products often is a normal part of thinking can think of, and product quality defective (毕业设计 )models, because of the use of materials, processing technology, and other issues often occur in fault location normal people can not think of thinking , of course, such a situation was not absolute. Below are a few examples to illustrate this, we have set out the probability of failure when used according to the order, that is, from the possibility of the site, the reasons for order.
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