Do you have the wrong habit of using a car in situ hot car?
It is about to enter November, and some areas have entered winter ahead of schedule, so some fuel vehicle users have begun to heat up in situ; However, this method of using the car is wrong, and it can be said that it does more harm than good except for causing problems to the engine and exhaust system. Today, let's talk about the three hazards of in-situ hot cars, and the reasons for the formation of this car habit.
The advent of the "carburetor" determined the necessity of in-situ hot cars.
When most old drivers have this kind of car habit, there must be a reason for in-situ hot cars; Before 9/0, most of the fuel injection systems used in cars were not "EFI" but "carburetors." "The carburetor is a tool that atomizes fuel based on the venturi principle, and the engine used in the car cannot directly pour liquid fuel into the cylinder; The fuel must be atomized before it can enter the cylinder, and then the gasoline in the form of a mist is evaporated at high temperatures by the compression stroke – gaseous fuel burns more efficiently and can be burned more fully during the power stroke.
The role of the carburetor is to atomize the fuel, but the effect of the carburetor atomizing the fuel has a certain relationship with the temperature.
In short, the atomization effect is poor at low temperatures and good at high temperatures.
Poor atomization effect will cause insufficient combustion when the work is done in the cylinder, less heat energy will be converted, poor engine power performance and the difference in combustion efficiency of different cylinders will lead to unstable engine operation. It is very likely that the engine will stall while driving. Therefore, vehicles that use carburetors do need to be heated in situ after a cold start, and the formation of this driving habit makes sense.
On the contrary, after 2001 years, there is no longer a need for in-situ hot cars, because carburetors are completely banned in cars! And now motorcycles also have a carburetor disabled. At this point, cars and motorcycles no longer need to be heated in situ! Replacing the carburetor is the "EFI system." "EFI refers to pumping and pressurizing with a motor, pressurizing when the injector is closed, and then injecting and atomizing the fuel through high pressure and fine nozzle holes after opening.
The freezing point temperature of gasoline is -117°C, and the freezing point temperature of ethanol gasoline is -0°C.
As long as the temperature is not lower than minus 117 degrees, the gasoline will not freeze, and the gasoline can be effectively atomized through the EFI system. Doing this is a waste of time, fuel and energy.
1. Carbon accumulation
The combustion adequacy of the engine at idle is the lowest, and the lower the combustion adequacy of the fuel, the more free carbon particles are generated. Carbon deposition in the engine is mainly formed during the idle process, and carbon deposition will not only cause the engine to run smoothly, but also affect the power and fuel consumption, focusing on increasing the probability of detonation and combustion.
2. Oil
Engine idling also burns oil, and the average fuel consumption of a hot car idling for one hour is equivalent to the engine displacement. This means that a 5.0-litre engine idles for one hour and consumes about 0.0 litres! And the lower the temperature, the higher the fuel consumption of fuel vehicles, and the idling and hot cars of cold cars are the most fuel-intensive state.
3. Clog the particulate matter trap
現在的汽油車也有顆粒物捕捉器，在排氣系統裡；其作用是收集發動機燃燒不充分所產生的顆粒物，在高溫狀態下進行還原。長時間的原地熱車會快速堵塞顆粒物捕捉器，結果是車輛行駛三五百公里就有可能造成顆粒物捕捉器的嚴重堵塞；隨之而來的是耗油量翻倍升高，動力也會明顯變差，因為堵塞會造成排氣背壓升高，這就是有一些燃油車會在用戶手冊里註明盡量避免原地熱車或怠速用車的原因。
The biggest misconception about in-situ hot cars is "effective lubrication." ”
In order to justify their outdated driving habits, some veteran drivers come up with unrealistic reasons, such as the severe wear and tear of the engine caused by not heating the car in situ.
However, the engine can achieve effective lubrication during the start-up process, and the oil pump of the engine is divided into two categories: mechanical and electronic; The mechanical oil pump rotates synchronously with the engine crankshaft, and the engine is driven by an electric motor to drive the crankshaft to run, so when the engine is started, lubrication can be formed, and effective lubrication is basically formed after the start is completed. Is it possible that the wear and tear during the start-up process is on the high side, and if the engine is not effectively lubricated for several minutes after starting it, the engine will be scrapped after a winter? The answer is obvious.
The oil is viscous at low temperatures, so it can't form effective lubrication?
This is the opinion of other veteran drivers, but it is also a ridiculous statement - the correct answer is that the higher the viscosity of the oil, the better the lubrication! High viscosity oils form a better film of quality, which can provide a better sealing and lubrication effect. Therefore, the lubrication effect during cold start is not only not bad, but better, and at the same time, there is no need to worry about the high viscosity of the oil and the inability to flow to each mechanical part that needs to be lubricated in time.
The only disadvantage of high-viscosity motor oil is increased fuel consumption, as it increases the resistance of mechanical components to operate.
Now I get it.
In fact, some electronic oil pumps can establish lubrication before the engine starts, so in-situ hot cars are an outdated car habit and should be eliminated.