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燃油添加剂到底有没有用?该如何选择?
作者:admin 来源:本站 发布时间:2021-3-30 11:33:49 浏览次数:357

燃油添加剂到底有没有用?该如何选择?

Is fuel additive useful? How to choose?

发动机积碳一直是国内车友在汽车保养方面非常关注的一个问题。积碳过多会造成冷启动困难,怠速不稳、动力下降、油耗上升甚至损害发动机等等问题,尤其是直喷涡轮增压发动机,让很多车主都深受积碳问题的困扰。为了解决发动机积碳的问题,车友们常用的方法就是使用燃油添加剂。燃油添加剂到底有没有用?该如何选择?一直是个众说纷纭的话题。作为一个长期使用燃油添加剂的8年老司机,今天我就跟大家聊聊燃油添加剂的话题。

Engine carbon deposition has always been a concern of domestic car users in car maintenance. Too much carbon deposition will cause cold start difficulties, unstable idle speed, power decline, fuel consumption rise and even damage to the engine and other problems, especially the direct injection turbocharged engine, so that many car owners are deeply troubled by the problem of carbon deposition. In order to solve the problem of carbon deposition in the engine, the common method used by riders is to use fuel additives. Is fuel additive useful? How to choose? It has always been a controversial topic. As an 8-year-old driver who has been using fuel additives for a long time, today I would like to talk about fuel additives.

发动机积碳成因要分析燃油添加剂的作用,首先要了解积碳产生的成因。

In order to analyze the cause of carbon deposition in engine, we should first understand the cause of carbon deposition.

一是汽油油品不佳。

First, gasoline products are not good.

汽油里的不饱和烃和胶质是产生积碳的主要原材料,我国国五汽油的烯烃和芳烃含量都明显高于国际水平,因此更容易产生积碳。

The unsaturated hydrocarbon and gum in gasoline are the main raw materials for carbon deposition. The olefin and aromatics content of China's penta gasoline is significantly higher than the international level, so it is easier to produce carbon deposition.

虽然国五汽油的烯烃含量从28%降低到24%(芳烃的标准没变),但是依然远高于国际水平(尤其是美国)。所以很多优异的发动机,来到国内都会水土不服。典型的就是本田“地球梦”系列发动机,来到国内被车友们戏称为“挖煤梦”,车主深受积碳问题的困扰。

Although the olefin content of G5 gasoline has been reduced from 28% to 24% (the aromatics standard has not changed), it is still far higher than the international level (especially in the United States). So many excellent engines will not adapt to the domestic conditions. A typical example is Honda's "earth dream" engine series. When it comes to China, it is called "coal mining dream" by car friends. Car owners are deeply troubled by the problem of carbon deposition.

二是汽油发动机工作方式的先天因素。

The second is the congenital factor of the working mode of gasoline engine.

主流汽油发动机主要分为歧管喷射和缸内直喷两种,两者积碳的成因和产生的部位又有所区别。

Mainstream gasoline engines are mainly divided into manifold injection and in cylinder direct injection.

歧管喷射发动机:

Manifold injection engine:

歧管喷射发动机的喷油嘴安装在进气歧管上,喷出的汽油和空气在进气歧管中进行混合,然后进入汽缸完成燃烧做工。由于歧管喷射的工作方式是先喷油再点火,在运转的过程中多余的汽油会粘附在进气门和燃烧室上。当发动机熄灭之后,由于活塞工作不同步,有些汽缸的进气门不能完全关闭,残余的汽油又会蒸发附着到进气歧管和节气门后壁,这些残存的汽油反复受热后变硬就形成了积碳。因此,歧管喷射发动机从节气门、进气歧管、进气门、活塞顶部到汽缸内部都会产生积碳。但是汽油本身是一种良好的有机溶剂,具有一定的“自洁”能力,所以歧管喷射的发动机积碳问题相对轻一点。另外,进气系统的积碳对歧管喷射发动机的性能影响比燃烧室积碳要大一些。

The fuel nozzle of the manifold injection engine is installed on the intake manifold. The gasoline and air are mixed in the intake manifold, and then enter the cylinder to complete the combustion. As the working mode of manifold injection is to inject fuel first and then ignite, the surplus gasoline will adhere to the intake valve and combustion chamber during operation. When the engine goes out, the intake valves of some cylinders can not be completely closed due to the asynchronous operation of the piston, and the residual gasoline will evaporate and adhere to the intake manifold and the rear wall of the throttle valve. The residual gasoline will harden after repeated heating and form carbon deposition. Therefore, the manifold injection engine from the throttle, intake manifold, intake valve, piston top to the cylinder will produce carbon deposition. But gasoline itself is a good organic solvent, with a certain "self-cleaning" ability, so the problem of carbon deposition in manifold injection engine is relatively light. In addition, the effect of carbon deposition in the intake system on the performance of the engine is greater than that in the combustion chamber.

缸内直喷发动机:

In cylinder direct injection engine:

缸内直喷发动机的喷油嘴安装在燃烧室的上方,将汽油直接喷射到燃烧室内部,空气经过进气门进入燃烧室与汽油混合,完成燃烧做工。在车辆起步或者低负载的工况下(比较典型的就是城市拥堵路段的行车工况),发动机的工作温度不够高,很容易产生汽油燃烧不充分的情况,因此直喷发动机在燃烧室内比较容易产生积碳。

The fuel injection nozzle of in cylinder direct injection engine is installed above the combustion chamber to inject gasoline directly into the combustion chamber. Air enters the combustion chamber through the intake valve to mix with gasoline to complete the combustion. Under the condition of vehicle starting or low load (the typical driving condition is urban congestion section), the engine working temperature is not high enough, it is easy to produce the situation of insufficient gasoline combustion, so the direct injection engine is easy to produce carbon deposition in the combustion chamber.

直喷发动机产生积碳的另外一个重要来源是曲轴箱通风系统。

Another important source of carbon deposition in DI engine is crankcase ventilation system.

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