No EFI motor vehicles need to be heated in situ. "Hot car in place" is the habit of carburetor engine, and the purpose of hot car is to idle smoothly without stalling! Carburetors have long been a thing of the past in the automobile field, and 200 1 completely banned production. The requirements for motorcycles are much more relaxed, because the fuel consumption base of such vehicles is relatively small, and the consumption and exhaust emissions generated by hot cars will not have much impact. Therefore, carburetor motorcycles are not allowed to be licensed before July 20 19 1, which has caused many motorcycle users to have the bad habit of heating on the spot after entering the era of EFI.

Knowledge point 1: The function of carburetor is to output fuel for internal combustion engine, but after the engine block reaches the ideal high temperature, gasoline needs to be atomized effectively. In the low temperature environment, the carburetor temperature of the cold start engine will be lower, and the engine at this stage can not obtain a high standard of oil-gas mixture. The popular description is that the mixture is "rich or lean" and the torque of combustion conversion is "big or small". Standard torque is the basis of driving the crankshaft of internal combustion engine to run stably at idle speed. The torque is unstable, the idle speed is unstable, and direct driving is easy to cause flameout.

Knowledge point 2: EFI technology uses "pressure oil injection" instead of "oil melting" at high temperature. Its working principle is to pump gasoline out by a fuel pump, and the function of the pump is to pressurize the liquid (forming a certain concept of "forcing oil"-extrusion). After the accumulated pressure of the injector reaches the ideal standard, the nozzle hole is opened by closing the loop. Under the action of high pressure, fine atomized oil injection can be realized through a plurality of small spray holes. This principle is like a water pipe that nourishes water. When the water pipe is squeezed, it will be pressurized, and when it is loosened, it will be filled with oil.

The EFI technology is completely unaffected by temperature, because the temperature will not affect the normal operation of the fuel pump. The so-called fuel pump is actually a motor. But the freezing point of gasoline is as low as -70℃ or above, and gasoline will not wax like diesel. Therefore, EFI motorcycles and cars do not need to be preheated in situ. This mode of car use has no positive effect except increasing fuel consumption and reducing engine speed, including engine block lubrication, which is also misinterpreted according to experience.

The Core of Internal Combustion Engine Lubrication System —— Oil Pump

No matter the four-stroke engine of a car or motorcycle, its oil pump is not a "motor". The structure that drives the oil pump is the crankshaft (the structure of motorcycle engine is a little more complicated), and the internal combustion engine will reach the "idle+"state after starting, because the engine body temperature and antifreeze coolant temperature are very low during cold start, and the oil temperature of oil-cooled motorcycle will be as low as the ambient temperature.

At this time, the engine body and engine oil will absorb the heat energy generated by combustion, which is actually absorbing the torque of the internal combustion engine; The reduction of torque will lead to insufficient heat energy to drive the piston crankshaft to run normally, and the engine will inevitably stall. If you want to turn off the engine, ECU should take the initiative to increase the idle speed, at the expense of increasing fuel injection and burning more fuel to generate more torque, so as to realize cold start and hot start! —— According to the cold start idle speed of 1 100rpm, how long can the oil pump achieve effective lubrication?

Reference automobile engine

Even a large-displacement six-cylinder and eight-cylinder engine will reach the "K-class" idle speed after starting. The oil pump will get enough power after amplifying the speed through the gear, and it only takes 3/5 seconds for oil to be pumped from the oil pan to the oil circuit for pressure lubrication. But it takes 1~2 seconds to start with a motor, and the crankshaft will reach several hundred revolutions during the starting process. Therefore, the lubrication of the internal combustion engine will be formed at a very fast speed, and it can run normally after starting, without worrying about wear.

Summary: The so-called internal combustion engine wear is mainly in the cold start stage. The accurate description should be that at the moment when the ignition switch is pressed, the node that starts the motor drives the internal combustion engine to run without effective lubrication. But no one can overcome this problem, and there is no need to worry about the influence of lubrication after starting. Therefore, as a vehicle user, there is no need to worry, and there is no need to heat the car in place during normal driving unless there is a hobby of burning engine oil for fun.

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