Nowadays, the Internet is very developed, and we can easily access all kinds of useful information. Many car owners usually browse some content about using and maintaining cars. It is reasonable to say that these contents can help us increase some car knowledge, which is a good thing. But in fact, some of the content is not rigorous, full of loopholes, not only does not help us with the car, but even misleads us. So today we will pull out some of the most common rumors and re-reveal the truth to everyone in principle.
1. The steering wheel hits the bottom damage booster pump
It has been said for a long time that the steering wheel will cause the booster pump to hold its breath and be easily damaged. Later, some people debunked rumors, saying that there was a pressure relief valve on the booster pump, and the pressure would automatically be discharged after the pressure exceeded the standard, so it was no problem to hit the direction to the end.
In fact, these two statements are not correct, and the boost pump may not necessarily hold its breath after the direction is hit to the end. In addition, the pressure relief valve is a necessary thing for the hydraulic system, that is, to prevent excessive pressure from damaging the system, just like the car circuit must have a fuse. However, when the pressure relief valve really works, the system pressure is indeed higher, which may have little impact on the new car, but it is not impossible for the old car to break the fuel pipe of the power relief system. Many old cars can hear the abnormal sound of the power pump belt, the muffled sound of the engine, and the hum of the oil pump after hitting the direction to the end, which is caused by excessive pressure.
The root of the problem is whether you let go of your hand or keep pushing hard after hitting the direction to the end. The most exquisite design of the hydraulic power steering system is the steering machine, the steering wheel is connected to a metal rod, and the metal rod is slightly deformed when the force twists when the direction is hit, and this deformation drives the hydraulic valve to open, supplying oil to the booster cylinder, so there is a boost. When we stop hitting the direction, the metal rod automatically recovers, the hydraulic valve closes, the booster cylinder runs out of oil, and the booster pump naturally does not need to hold its breath. If you still pull the direction hard after the steering wheel is hit to the end, the booster pump will have to hold its breath and the pressure relief valve will begin to work.
So the direction of playing to the end is not terrible, as long as the end of the timely release of the hand is no problem, if you still have a strong pull on the steering wheel after the end of the fight, the booster pump will definitely be unhappy.
2, the fuel tank is too full to hurt the car
Some people say that the tank is too full will lead to an increase in the pressure of the tank, which is more dangerous, it is recommended to add only 200 at a time. So the manufacturer designed such a large fuel tank only half can be used? Isn't that a great waste?
In fact, there is a clever self-sealing design inside the fuel tank, when the oil is added to the maximum scale, the internal ventilation pipe of the tank will be blocked by the oil, and the air in the tank cannot be discharged smoothly, so that the gas port will produce air resistance, causing the fuel gun to jump the gun. So don't be afraid to add more every time you refuel, you will jump the gun when you reach the maximum amount. And the real injury is to continue to add to the car after jumping the gun, because this may lead to gasoline poured into the carbon tank, waste of gasoline, not to mention, the carbon tank is some activated carbon, which is wasted by the gasoline bubble, and it will cost hundreds of pieces to change the carbon tank. Especially in the current national six car, the fuel tank evaporation control system structure is more complicated, and the maintenance cost will be higher if it really breaks out.
So remember, don't force the gun to jump every time you refuel.
3. The automatic transmission will burn out the gearbox
Will an empty-speed car burn out the automatic transmission? I think that under the same circumstances, the manual transmission will not necessarily burn out if the automatic transmission is burned out.
Because the automatic transmission has an oil pump, there are two main functions, one is to lubricate the gearbox, and the other is to power the hydraulic unit of the gearbox. The oil pump is directly connected to the engine, as long as the engine does not turn off, the oil pump will continue to supply oil to the gearbox, the lubrication conditions are so good, why is it burned out? Moreover, the automatic transmission also allows trailers, the trailer speed can not exceed 50 km / h, the towing distance can not exceed 50 km, no oil pump lubrication can be made in the case of this, now there is oil pump forced lubrication, it is impossible to burn out because of insufficient lubrication. On the contrary, the manual transmission does not have a special oil pump to force lubrication, and can only rely on the gear to stir the oil for splash lubrication, and in some cases it is really possible to burn out the gearbox.
In addition, for the CVT gearbox, after hanging into the neutral gear, the power will be cut off between the tapered wheel and the engine, and the tapered wheel group is in an empty state during the entire coasting process, and the steel belt load is smaller than when the belt is sliding.
Of course, we introduce these things not to encourage everyone to go to the empty car, but to let everyone look at these problems from a scientific point of view.
4, the engine high temperature can not be stopped immediately, otherwise the internal heat of the engine can not be dissipated
This statement sounds very reasonable, after all, the engine is constantly burning gasoline, the core temperature must be very high, if the high temperature is immediately turned off, then the coolant stops circulating, the heat of the engine core can not be dissipated, which will definitely lead to serious internal injuries.
In fact, this is not the case at all, first of all, the internal temperature of the engine is not as high as we think, because the gasoline burns very fast, some heat is converted into power, and most of the remaining heat is left in the exhaust gas and discharged from the exhaust pipe, and the heat that is really transferred to the inside of the engine is actually very limited. If the heat burned is absorbed by the engine, then according to the calorific value of the gasoline, you can step on the throttle to 2000 turns and the engine burns itself out within a minute. So stop immediately when there is a high temperature, don't worry about the engine will have internal injuries, its internal temperature is not as high as we think.
In addition, the water temperature alarm light is lit does not mean that the engine will burn out, because the current engine has a very accurate thermal management system, when the system detects that the water temperature exceeds the limited safety range, it will light the high temperature alarm light for the first time, and in fact, the temperature at this time has not reached the level of damage to the engine. For example, the control logic of the engine thermal management system of a certain model is that the normal working temperature of the engine is between 87-95 degrees Celsius, and the high temperature alarm light is lit when the water temperature exceeds 95 degrees Celsius. That is, when the engine water temperature is at 95 degrees Celsius, there is no problem, and when the water temperature reaches 96 degrees Celsius, the high temperature lights are lit, and you say that the water temperature of 96 degrees will cause damage to the engine? On the contrary, listening to rumors and not turning off the engine is the most dangerous, because the engine is already hot, which shows that the heat dissipation system has been in trouble, and the idle speed in situ can only make the engine water temperature continue to rise, and eventually damage the engine.
5. Do not turn off the air conditioner when the engine is turned off, and increase the burden of the battery and starter when it is started again
Some people say that if the air conditioner is not turned off when the engine is turned off, then the engine will rotate with the air conditioning compressor when it is started again, which will increase the resistance of the starter, which is not good for the starter and the battery.
The actual situation is really not the case, even if you do not turn off the air conditioner directly turned off, then the compressor is impossible to work when restarting the engine. Because the car air conditioning system is not as simple as we think, it is also controlled by a computer system. For ordinary cars, the air conditioning control system is integrated in the engine computer, and the better cars will have a special air conditioning control computer. The control computer will comprehensively determine whether the compressor needs to be started according to the air conditioning line pressure, evaporator temperature, ambient temperature, engine status, AC button signal and other factors. That is to say, the AC button on the air conditioning panel is actually connected to the air conditioning control computer, rather than directly controlling the compressor electromagnetic clutch. When the car starts, the air conditioning control computer will not let the compressor work, and the compressor will only be connected after the engine is running stably.
However, there is also a disadvantage of not turning off the air conditioner when parking, that is, when you turn on the power again, the air conditioner will be turned on. I remember my friend is turned off the air conditioner, sitting in the car in order to charge the mobile phone to unscrew the ignition switch to the ON position, the result of the air conditioning fan has been turning, he did not find, and finally the battery lost power.
6, try not to use eco mode, because it is easier to produce carbon deposits
Many people think that the ECO mode is fuel-efficient because the gearbox is more inclined to use a high-grade, low-speed state to drive, so that the combustion is not sufficient, but it is easy to produce carbon deposits.
In fact, this statement is not true, the most prone to carbon deposits in the engine is a low temperature work, the other is that the mixture is too thick, and there is burning oil. Because when the engine temperature is low, the gasoline is not easy to evaporate after entering the cylinder, there will be a part of the liquid gasoline sprinkled on the relatively hot combustion chamber and piston surface, these gasoline are heated and volatilized, and those substances that are not easy to volatilize will remain on the combustion chamber and piston surface, and over time become carbon deposits. After the engine reaches the normal working temperature, the temperature in the combustion chamber is very high, and the gasoline will evaporate into a gaseous state immediately after it goes in, even if there is a combustion residue, it is easy to discharge it with the exhaust gas, and it is difficult to accumulate inside the engine. When the mixture is too concentrated, it is easy to burn incompletely, producing a large number of carbon particles, some of which will accumulate on the combustion chamber and piston to form carbon deposits.
However, the mixture in THE ECO mode is still controlled in accordance with the standard air-fuel ratio, and will not be thickened, after all, the amount of fuel injection after the thickening is increased, which is contrary to the purpose of fuel saving, and the mixture is too thick will also lead to the deterioration of the exhaust gas, and the manufacturer has no reason to find trouble for themselves. In addition, whether it is ECO mode or normal mode, the engine and gearbox are more inclined to choose high-end low-speed under the premise of sufficient power, unless you are hooked into S gear or use manual mode to forcibly lock in low gear.
In fact, eco mode mainly saves fuel by changing the sensitivity of the accelerator pedal, that is to say, forcing you to drive gently. In addition, the car in ECO mode will also limit the air conditioning power to reduce the engine burden and save fuel. Therefore, it is unscientific to say that the ECO model is prone to carbon deposits.
We usually have access to a lot of information about using a car, but there is a lot of content that is not correct in itself, so we must learn to identify and believe what we cannot see.