Car fuel consumption is high in cold weather.

1, low tire pressure leads to increased fuel consumption.

This reason is quite common. When the outdoor temperature drops in winter, the volume of gas in the tire will become smaller, which will easily lead to low tire pressure. If the tire pressure is too low, the contact area between the tire and the ground will increase, resulting in an increase in fuel consumption. If the tire pressure is too low, it will also reduce the service life of the tire, so it is recommended that you inflate it in time after entering winter.

But some car owners will change their cars into snow tires in winter. Compared with ordinary tires, snow tires have a special formula, which increases the friction with ice and snow roads, makes the tread softer, and improves the passability and safety of water and snow roads. However, due to the improvement of grip and friction, cars equipped with snow tires tend to have higher fuel consumption, which is also the most important reason why northern car owners feel the increase in fuel consumption in winter. As for the difference in fuel consumption between using four-season tires and using snow tires, this figure is about 10%, and the fuel consumption after using snow tires will be about 10% higher than that after using four-season tires.

2. Incorrect use of automobile air conditioner.

Using the air conditioner in the car in winter, blowing hot air consumes more fuel than blowing cold air in summer. Bian Xiao thinks that many car owners should have misunderstood this point.

Theoretically speaking, the hot air will not start the air conditioner compressor, but will send the hot air from the engine water tank to the cab, thus heating up the room. On the surface, many people think that this hot air will be generated even if it is not used, and there is no extra energy consumption and no extra fuel consumption. In fact, the hot air in the engine water tank can really warm the cab, but if the hot air is insufficient, the engine will have to do extra work to generate more heat energy to meet the temperature requirements of the cab, which means extra fuel consumption.

In addition, when the vehicle is started after being fully warmed up, although the water temperature is normal, hot air has not been fully generated. If the hot air is turned on immediately, it will force the engine to do passive work, supply heat in advance, and increase additional fuel consumption.

3. The viscosity of engine oil causes the running resistance of the engine to increase.

Because of the low temperature in winter, the engine oil tends to thicken, especially after the vehicle is parked overnight, the engine oil has generally sunk to the bottom of the cylinder, and all parts in the cylinder can not be lubricated by the engine oil. Some oils have poor lubricity, which is easy to cause dry friction of the engine.

High-grade all-synthetic engine oil, the viscosity of engine oil changes little with temperature, and the same oil film requires that synthetic oil can be formed at lower temperature to protect the engine, which is helpful to reduce the energy consumption when the automobile starts at low temperature and prolong the battery life; In addition, because the lubricating oil flows to the friction surface for a short time, it can reduce the dry wear of parts when the engine is started and prolong the service life of the engine. "Using advanced all-synthetic engine oil can generally reduce fuel consumption by 3% to 5%."

4. When the temperature is low in winter, the thermal efficiency of the engine decreases.

The word thermal efficiency must be heard often. The thermal efficiency of gasoline internal combustion engines is relatively low, and the thermal efficiency of gasoline internal combustion engines of most automobile manufacturers is about 35%. The energy generated by gasoline combustion will be wasted in various ways, such as the cooling system and the friction of internal components.

In addition, because the cooling water will take away some heat in the circulation, the cooling water will take away more heat in winter than in summer, which makes it difficult to maintain the normal working temperature of the engine. In this case, the engine will also maintain its normal operation by increasing fuel injection.

5, hot car time is too long

In winter in the north, the weather is extremely cold, so hot cars naturally become the habit of most car owners before driving. Of course, a hot car can make the engine and other parts work better. In this cold environment, Bian Xiao also strongly advocated that everyone should warm up the car, but the time of warm-up must be well controlled. Overheating the car (more than five minutes) not only increases fuel consumption, but also easily produces carbon deposits.

In addition, the reason for the increase in fuel consumption may be related to the water temperature or air temperature sensor, or the engine fuel consumption may be increased due to the failure of the air flow meter or other components of the electronic system at low temperature. If the fuel consumption only increases by 1~2 liters, it is within the normal range, but if the fuel consumption increases by more than 5 liters per 100 kilometers, it is abnormal. Owners in similar situations should maintain their vehicles in time or go to professional repair shops for maintenance.

In addition to the above reasons, there are some secondary factors that lead to the increase of fuel consumption in winter-for example, because the thermal efficiency of the car is reduced, the driver will unconsciously step on the accelerator in order to maintain the normal speed; It is often windy in winter, and the wind resistance caused by driving against the wind will also increase fuel consumption; If you catch up with the snowy road, the road conditions and driving conditions are poor; Battery problems in winter, gasoline quality problems in winter, and wet and polished roads in winter also affect the fuel consumption performance of the car. Although these aspects are not important in isolation, their comprehensive impact on fuel consumption is obvious.