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汽车拉高速对除积碳有用吗拉高速和拉高发动机转速是一回事吗

时间:2019-07-15
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今天,每个人都在聊天并谈论一个话题,也就是说,汽车高速行驶是否有助于清除碳储量?很多人说没有这样的事情。如果它有用,我为什么要高速行驶呢?拉高速不是为了提高发动机的速度。我可以使用相同的速度来提高发动机转速吗?那么这个陈述有什么问题呢?汽车能否高速消除发动机中的积碳?拉高速和提高发动机转速是一回事吗?让我们谈谈每个人都非常关注的这个话题。

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我先告诉你一个小故事。

20世纪80年代,中国从德国进口了一些梅赛德斯 - 奔驰汽车,用于外交接待和接待大型会议。那时,这是最先进和最高尚的事情,普通人根本无法达到它。因此,选定的司机是优秀的员工,具有良好的驾驶技能和强烈的责任感,他们使用的机会较少。很多时候他们都处于城市低速状态。旅行。

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然而,即使经过如此谨慎的使用,这些车辆也经历了一段时间后出现空转抖动和加速不良等问题。当时,国内汽车维修技术水平找不到失败的原因。这可能会让车队队长匆匆忙忙地向上司报告车辆的质量存在问题,无法修复。申请制造商以协助解决方案。这一事件很快反映在梅赛德斯 - 奔驰总部。德国的梅赛德斯 - 奔驰也非常重视这个问题,并派出了几位技术专家来帮助解决这个问题。

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这些专家来到中国之后,他们仔细检查过这些车,但没有给出维修建议。相反,他们问团队的队长。北京有一条可以高速长途旅行的公路吗?船长说,从市区到密云水库有一百多公里。道路条件非常好。这位德国专家说:好吧,让你的司机上车,跟我来。我怎么打开它,让它们打开它;我开得多快,让他们开得快。然后他们在路上行驶,德国专家开始开车,行驶速度快,几乎脚足油,发动机转速极高,最高时速近200公里。中国司机过去从未如此开放,他们非常小心地慢慢加油,最高时速不超过百,车不是那么冷,他们非常担心开车破车。

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很快他们就到了目的地。德国专家下车后说的第一句话是:现在检查你的车,还在摇晃?加快怎么样?当中国司机检查时,他惊讶地发现怠速抖动和加速度不良等故障消失了。发动机转动平稳,加速度很强。这辆车比以前更透明了。这是怎么回事?队长们迫不及待地问德国专家,而专家只说了两个字:碳!

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事实证明,这些汽车长时间在城市地区以低速和短距离行驶。发动机积累了一定量的碳沉积物。这些碳沉积物导致发动机空转和加速不良。现在汽车已经经历了高速行驶,它已经清除了部分碳沉积物,并且由碳沉积物引起的故障被自然清除,并且发动机恢复到最佳状态。后来,在德国专家的指导下,这些汽车经常高速行驶,没有碳沉积造成的问题。

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What does this little story say? That is, the car running at high speed can indeed remove the carbon deposits in the engine, which is contrary to many people's opinions, but it is. Scientific experiments have also proved this: cars driving at speeds of more than 3,000 rpm on the highway for about ten minutes can remove about 20% of the carbon in the engine, but the accumulation of carbon for long-term accumulation. not so useful.

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So why can the car pull high speed to remove carbon deposits from the engine? Let's start with the source of carbon.

Carbon deposit is the residue generated by the incomplete combustion of unsaturated olefins and colloids in the engine oil and fuel at high temperature during the working process. It is not accumulated in the system at various positions in time with the exhaust gas, thus forming a black color. The focally substance, which people call "carbon accumulation." But carbon is not a "carbon", but an organic compound, which is generally sponge-like and has oil-absorbing properties, which will adsorb gasoline into it and then become carbon deposits, thus forming a vicious circle, resulting in more and more carbon accumulation. In order to change the engine's structural parameters and reduce engine performance, the engine may experience idling, acceleration, fuel consumption, cold start and other faults, which affect the normal use of the car.

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xx那么碳沉积是如何形成的呢?如前所述,碳沉积物是由汽油和油的不完全燃烧产生的。当我们熄灭发动机时,点火装置立即切断,但在此工作循环中喷射的汽油无法回收。汽油中的蜡和胶体沉积在燃烧室和其他部件中,在高温下形成。类似地,曲轴箱强制通风系统将一些油蒸汽带入燃烧室以参与燃烧。当发动机关闭时,这些油蒸气沉积在进气系统中,并且在一系列物理和化学变化之后,逐渐形成碳沉积物。此外,如果汽车长时间低温低速运转,发动机将喷射更多燃料,燃烧室温度将降低。这些过量的燃料也会沉积在燃烧室中以形成碳沉积物。因此,在短时间内不形成碳沉积,但是存在一种方法。形成时间的长短与汽车的使用环境,发动机结构,油和汽油的质量以及驾驶员的操作有一定的关系。一般来说,轻微的碳沉积不会影响汽车的正常使用,只有当积碳严重时才会影响汽车的性能。

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那么我们日常使用的驾驶习惯会导致燃油不能完全燃烧?其中一个最重要的原因是汽车的长期低温和低速行驶(在城市拥堵下)和长期的现场热车。在这两个条件下,进入发动机的可燃混合物具有相对低的空燃比(浓混合物)。雾化不均匀,涡流速度慢。因此,可燃混合物的燃烧速率慢,燃烧温度低,并且一些燃料不能完全燃烧,因此一些燃料沉积在发动机燃烧室中。碳。此外,使用劣质燃料或油,发动机油等,也会加速碳沉积物的形成。还有一种现在常用的缸内直喷发动机。由于进气口中没有诸如汽油的良好溶剂,因此进气阀处的碳沉积非常严重。

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So what is the combustion state of the engine when the car is driving at high speed? For example, when the car cruises at a speed of 3000 rpm and a speed of 120 km/h, the fuel supply system supplies the engine with a higher air-fuel ratio combustible mixture (lean mixture), and the mixture is atomized uniformly and at a flow rate. Fast, such a mixture can be completely burned in the combustion chamber, and there is no fuel remaining, and naturally no carbon deposit will occur. In addition, at this time, the engine speed and load are relatively high, the intake air amount is large and the speed is fast, and the carbon which is partially adhered is not very solid, and is burned off together with the mixed gas; and in this case Under the flammable mixture, the combustion temperature is very high, so that the carbon deposit can be melted and burned at a high temperature, and the carbon deposit in the engine will be less and less. Therefore, when the car is driving at a high speed, not only does it not produce carbon deposits, but it can also remove carbon deposits. In theory, as long as the duration is long enough, the carbon deposits in the combustion chamber can be completely removed. The effect of the fuel additive will be more obvious. However, this only removes the carbon deposits in the combustion chamber and has no effect on the carbon deposits in the throttle and carbon deposits in the intake valves.

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In this regard, some people have done experiments specifically. Remove a spark plug of a serious carbon engine, observe the carbon deposit of the combustion chamber with an endoscope, and then let the car run normally in the urban area, drive at low speed in the urban low-speed, highway at high speed, and then observe the combustion chamber. The carbon deposit in the case. The results show that the car has a very limited effect on the removal of carbon in the low-speed driving in the urban area, and the car can remove carbon deposits at high speed. When the car is at a speed of more than 3,000 rpm, the speed is above 120 km/h. Driving on the road for about ten minutes can remove about 20% of the carbon in the engine. But continue to run, the effect of carbon removal is not obvious, mainly because the long-term formation of stubborn carbon is difficult to remove in a short time.

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xx件下运行,而发动机高转速运行仅仅是指发动机的转速高而已,它们最大的区别在于发动机负荷率的不同。比如说汽车在高速公路上以3000转/分钟的转速、120公里/小时的速度巡航,此时节气门的开度可能在60%左右,属于中高负荷工况;而汽车停在原地不动,可能只需要把节气门打开30%左右,发动机转速就可以达到3000转/分钟,属于低负荷工况。在这两种工况下,气流的流动速度、燃烧室的温度、燃烧室中气体的压力都是截然不同的,相对来说,高速行驶的汽车这些参数更高一些,对积碳的清除作用也更强。

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也会有人这样想,我在城市中让汽车以低档位、高转速行驶,这样是不是也可以清除积碳呢?这样做的效果和汽车在高速公路上高速行驶哪一个效果更好呢?事实上这样做对清除积碳也是有一定效果的,但是却不如拉高速更好。原因还在于发动机负荷率的不同,汽车高速行驶时巨大的空气阻力会大大消耗汽车的功率,发动机必须全力以赴才能完成这样的任务,因此会增加进气、快速燃烧,发动机燃烧室中的温度和压力都比低档位、高转速行驶的汽车更高,清除积碳的效果也更好。

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件下,没有任何技术可以完全阻止积碳的形成,只能在一定程度上减缓积碳的形成速度。

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