What is the reason why the car doesn't light up in winter?

In winter, the temperature is below 0℃ in most parts of China, around -25℃ in the north and around -35℃ in some areas. When the car is used at low temperature, it is easy to cause the engine to start difficultly, the fuel consumption increases and the parts are seriously worn. At \x0d\ low temperature, the main reasons for the difficulty in starting the engine are the increase of lubricating oil viscosity, the deterioration of fuel volatility and the weakening of battery working ability. Lubricating oil has high viscosity and poor fluidity, which increases the rotation resistance of the engine crankshaft, reduces the starting speed, slows down the gas flow rate in the intake pipe, and causes poor fuel atomization and can not be started quickly. \x0d\ With the decrease of air temperature, the viscosity and specific gravity of gasoline increase, and the volatility becomes worse. According to the test, when the temperature drops from 40℃ to-10℃, the viscosity of gasoline increases by 76% and the specific gravity increases by 6%, which makes the fluidity of gasoline in carburetor oil circuit worse. In the throat, atomization is difficult because of the increase of surface tension. In addition, the engine block absorbs heat at low temperature, which affects the temperature of the mixture, causing most of the fuel to enter the cylinder in liquid state, causing the mixture to pass through olefins and making it difficult to start. \x0d\ At low temperature, due to the increase of electrolyte viscosity, the permeability decreases and the resistance increases, the output power of the battery decreases, making it difficult for the starter to drag the engine, unable to reach the minimum starting speed and affecting the engine starting. At the same time, due to the low terminal voltage of the battery, the spark of the spark plug is weak, and the density of the mixed gas increases the resistance between the electrodes, which makes it difficult to ignite the mixed gas, which is also the reason why the engine is difficult to start. \x0d\ When the engine is started at low temperature, the wear of parts is relatively accelerated, which greatly affects the life of the engine. According to relevant data, when the temperature is 5℃, the automobile starts the cold machine once and heats it to normal temperature, and the cylinder wear is equivalent to the automobile running for 30-40 kilometers; When the air temperature is-18℃, start the primary cooler and heat it to normal temperature, and the cylinder wear is equivalent to the automobile running for 200-250km. In the total amount of engine wear, the wear in the start-up stage accounts for about 50%. If cold start is often carried out at low temperature, cylinder wear will be more serious. There are three reasons for this: \x0d\ First, the friction surface is not lubricated in time. During a cold start, it is impossible for the oil pump to immediately pump lubricating oil to all friction surfaces. Deteriorate the lubrication conditions in the initial stage. \x0d\ Second, the lubricating oil film on the cylinder wall is damaged. Because of the low temperature, gasoline is difficult to atomize, and some non-atomized fuel enters the cylinder in liquid state, which washes away the residual oil film on the cylinder wall, worsens the lubrication condition between the cylinder wall and the piston ring, and the wear amount increases sharply. This situation exists to varying degrees until the engine reaches the normal temperature. Therefore, the practice of "slamming on the accelerator" after a cold start is very harmful and should be resolutely corrected. \x0d\ Third, it is corroded by acidic substances. Before the engine reaches the normal working temperature, the sulfide produced by gasoline combustion and the water vapor condensed on the cylinder synthesize acidic substances, which corrode the cylinder wall and piston ring and accelerate the wear. The lower the working temperature of the engine, the more serious the wear. Due to the difficulty in preheating the transmission part, its normal temperature is often ensured by the friction between parts and the heat generated by the stirring oil, and the temperature rises slowly. At this time, the gears and bearings are not fully lubricated, which increases the wear. At low temperature, the engine cylinder and intake pipe are filled with cold air, which leads to low starting speed and large heat dissipation, and gasoline can not be completely vaporized and burned, which not only increases fuel consumption, but also reduces engine power. \x0d\ Pay attention when starting in winter: \x0d\ 1. It is best to start the engine before turning on the lights, radios and other electrical equipment. Before parking, turn off these power-consuming electrical facilities and then turn off the engine. Because the battery is still discharged after the vehicle is turned off at night. At this time, the electrostatic discharge current is very small, generally below 0. 1 A, which belongs to normal discharge. Winter is coming, so vehicles should go to the maintenance station early to test this parameter. For some aging vehicles, the electrostatic discharge current may reach 1a or even several A, which may easily lead to battery loss and may not be started the next day. Generally speaking, below 0.5 A is within the acceptable normal range. \x0d\2。 Just don't fail the first time, just the second time and the third time? In fact, this will only accelerate the consumption of electricity. Once the power consumption is clean, even the cart will not help. Therefore, when the first startup fails, it is best to wait for 30 seconds before making a second startup attempt. Also, don't rush to drive at high speed after the car starts, but give the car a warm-up time, so that the car is not easy to wear and tear, and it can also improve fuel economy. Under normal circumstances, the water temperature of the vehicle must reach at least 40 degrees Celsius before it can be started.