To understand the reason, we must first start with the cooling principle of the engine. The engine needs to have a normal temperature environment (80~90) when it is working.If the temperature is too high, the engine’scooling systemIt can automatically change the cooling water circulation, increase heat dissipation, and take away excess heat; on the contrary, reduce the circulation of cooling water to maintain the necessary temperature.The main component that realizes the automatic change of the cycle is the engine temperaturesensorsensor, thermostat thermostat and magneticfan.
When the cold engine is started, the magnetic fan is in the stopped state and the throttle valve is also in the closed state. The engine coolant only circulates in the engine water jacket for a small amount of time, which makes it difficult to dissipate heat.sensorThe temperature index of the engine will be affected by the command to increase the fuel injection and increase the opening of the idleRotating speed, It is helpful for the engine to heat up quickly; when the temperature is normal, the fuel injection quantity and the opening of the idle valve will return to normal.When the temperature exceeds 80~90 degrees (different from each car), the throttle valve opens, and the coolant in the engine water jacket flows through the throttle valveheat sinkThe radiator makes a large cycle, and takes away a lot of heat through the air flow generated by the driving of the vehicle, and maintains the normal temperature of the coolant. If the car is slow or even stopped but does not turn off, and there is no flowing air to help dissipate heat, the engine will quickly heat up. At this time, the temperature sensor sends a command to start the magnetic fan to help the radiator dissipate heat.
In winter, what the engine needs is heat preservation instead of heat dissipation! In winter, due to the influence of flowing air, the temperature of the engine is not easy to maintain between 80 and 90 degrees. The engine will increase the fuel injection and change the ignition advance angle to maintain the temperature. At the same time, the thermal efficiency of gasoline is also much lower than that of hot days. In addition, in order to maintain a normal vehicle speed, you will unknowingly increase the throttle opening. These will increase fuel consumption.
Let's talk about whether the hot air is used for fuel. The answer is yes-turning on the hot air will definitely increase fuel consumption!
In order to maintain the temperature in winter, the engine is mostly in a small cycle; when you turn on the hot air, the cold air in the car quickly flows through the heatercore surface, which actually adds a high-efficiency radiator to the cooling circulation system of the engine! Its role can be imagined.
All in all, the fuel consumption in winter is definitely higher than usual, and even higher than when the air conditioner is turned on in summer; it is even more dramatic when the hot air is turned on too much. (Tencentcar)
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