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机油灯报警就是缺机油?-Distinguish the meaning of the flickering oil light

作者:广州星展汽车配件有限公司 浏览: 发表时间:2019-07-12 14:31:10

汽车仪表板中隐藏着各种警示灯,对于普通车主而言,任何一个警示灯点亮,都可能引起一阵恐慌。因为报警就意味着车辆可能存在故障,意味着可能又是一笔开销。


在这些警示灯中,有一个非常容易识别的,大家称之为机油灯。机油灯报警意味着什么?可能大部分人都会以为是缺机油了,补加一点机油就能解决问题,然而当你拔下机油尺,却往往发现机油量是正常的。这是为什么呢?


事实上,机油灯分为两种,而大部分车主将二者混淆了。一种叫“机油压力警告灯”,一种叫“机油液位警告灯”(很多车没有“机油液位警告灯”)。请注意二者外观的区别:“机油压力警告灯”通常看上去就像一个“阿拉丁神灯”一样;而“机油液位警告灯”则像是“阿拉丁神灯”漂在水面上。这两个警示灯所反应的问题截然不同,我们应区别对待。


顾名思义,“机油位警告灯”是警示机油油量不足的。当它报警时,我们就应该检查一下机油尺,看看是不是缺机油了。


“机油压力警告灯”则是警示机油压力问题的,之所以很多人误认为它是一个机油油量的报警灯,是因为严重缺少机油时,也会导致机油压力不足,所以此时机油压力警告灯同样会报警。


除此之外,如果存在以下问题,即便你的机油量充足,也会出现机油压力不足,造成“机油压力警告灯”报警。


01

机油黏度过低

机油黏度过低会导致系统密封性下降造成机油压力不足。造成机油黏度过低的原因我们可以分为内因和外因两部分。内因就是机油自身问题,比如选择了与发动机不匹配的机油黏度,或者使用了劣质机油。外因则是因外界因素导致机油黏度下降,如激烈驾驶导致油温过高(机油黏度会随温度升高而下降),冷却系统故障导致发动机过热,或者曲轴箱窜气导致机油被燃油稀释等。


02

机油泵故障

机油泵出现故障也是造成机油压力不足的一个主要因素,常见故障为机油泵轴承磨损过大,造成机油泄压。


03

机油油路或机油滤芯堵塞

机油油路或机油滤芯被油泥堵塞,会导致机油泵泵送的机油量不足,造成机油压力过低。造成堵塞的原因主要有两种:一个是车辆超出保养周期过长而未更换机油和机滤,另一个原因则是使用了劣质机油。


04

控制电路问题

如果机油灯的控制电路出现问题,则可能出现“报假警”,也就是机油压力和液位正常,机油灯却点亮了。造成这种现象的原因包括:机油压力传感器、机油液位传感器、仪表控制单元以及相关线路故障。


不论是以上何种原因,机油灯报警都是不容忽视的。当行驶中遇到机油灯报警的情况,我们应立即将车停在路边进行检查,如果是“机油液位警告灯”报警,通过补加机油通常可以解决,如果出现“机油压力警告灯”报警,我们应更加重视,因为机油压力不足可能导致发动机润滑不良,造成严重问题。因此,“机油压力警告灯”报警后,不可长途行驶,应将车送至就近修理厂进行检修。


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The auto dash board carries various warning lights, any flickering of which will lead to the rider’s panic. As normally the flickering warns some possible problem to vehicles resulting in possible expense.


A kind of light named engine oil light is easily differentiated with others on the dash board. What does that mean for the flickering oil light? To most of us, it may mean shortage of oil, and it will be easily solved after recharging some oil to the engine.  When we pull out the oil gauge however, the oil volume in the tank is normal. That’s why?


Actually, there are two kinds of oil lights which are easily confused by drivers. One is called oil pressure warning light and the other is called oil level warning light (lots of vehicles are not fitted with oil level warning light.). Note the difference on their appearance. Oil pressure warning light looks like a Lamp of Aladdin, while the oil level warning light looks like a floating Lamp of Aladdin. We should distinguish the two lights which reflect very different problems.


As it is named, the oil level warning light tells the problem of lacking oil. Therefore when it is flickering, we need to check the oil gauge to see if the engine oil is in shortage.   


Oil pressure warning light tells the problem of oil pressure. The reason why it is mistaken into oil volume warning light in some cases, is that the oil will also be short of pressure at sorely lack of oil, in which situation the oil pressure warning light will be flickering for alarm too.


What’s more, if any case below happens, even if the engine oil is plenty enough, the oil pressure will also be insufficient leading to the alarm of the oil pressure warning light.


01

Oil viscosity is too low

Low engine oil viscosity will reduce the sealability of the system leading to insufficient oil pressure. The reasons for over-low viscosity can be distinguished as external one and internal one.  The internal reason lies in the engine oil itself, such as the oil viscosity selected is not matching with the engine, or the oil in use is in poor quality. The external reason attributes to the exterior factors resulting in oil viscosity decline, for instance, intense driving results in oil’s overheating (the engine oil viscosity decreases with temperature raising.), or cooling system failure leads to engine’s overheating, or blow-by of crankcase cause the engine oil to be diluted by fuel.


02

Oil pump failure

Oil pump failure is one key factor for insufficient oil pressure. The common failure is the over worn to oil pump bearing resulting in oil depressurizing.


03

Oil circuit or filter is blocking

Once the oil circuit or oil filter was blocked by sludge, the oil amount sent from oil pump will be not enough leading to low oil pressure. The blocking mainly happens in two cases: first the vehicle’s maintenance is overdue for long without replacing the oil and filters; second is to use oil in poor quality. 


04

Control circuit’s problem

If there is some problem to the control circuit, it will cause “false alarm” that is, the oil light flickers with normal oil pressure and liquid level.  This is possibly caused by oil pressure sensor, oil liquid level sensor, instrumental control unit and the relative circuit failure.


No matter what reason for the flickering oil light, it should be taken seriously.  If the warning happens on the road, we should stop immediately at roadside to check the reason. For alarm from oil liquid warning light, recharging oil should be a workable solution. If the alarm is from oil pressure warning light, we should be more cautious, as the pressure shortage may lead to poor engine lubrication resulting in serious problems. Therefore, once receiving the alarm of oil pressure warning light, it is prohibited to drive the vehicle for long any more, and the vehicle should be sent to a garage nearby for checking and repairing.  


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