The cooling system of the automobile engine is a forced circulation water cooling system, which uses a water pump to increase the pressure of the coolant and forces the coolant to circulate in the engine. The cooling system mainly consists of a water pump, radiator, cooling fan, compensation water tank, thermostat, water jacket in the engine body and cylinder head, and ancillary devices. In the cooling system, there are actually two heat dissipation cycles: one is the main cycle for cooling the engine, and the other is the vehicle interior heating cycle. Both cycles are engine-centric and use the same coolant.
1. Main circulation of cooling engine
The main cycle includes two working cycles, namely “cold cycle” and “normal cycle”. After starting the car from a cold start, the engine is gradually heating up, and the coolant temperature is not yet able to open the thermostat in the system. At this time, the coolant only goes through the water pump to perform a “cold start cycle” in the engine, with the purpose of making the engine reach the maximum temperature as soon as possible. normal operating temperature. As the engine temperature increases, the coolant temperature rises to the opening temperature of the thermostat (usually this temperature is after 80°C), and the cooling cycle begins the “normal cycle”. At this time, the coolant comes out of the engine, passes through the radiator at the front of the car, dissipates heat, and then enters the engine through the water pump.
2. Car heating cycle
This is a heating cycle, but for the engine, it is also an engine cooling cycle. The coolant passes through the heating device in the car, sending the heat of the coolant into the car and then back to the engine. One thing is different: the heating cycle is not controlled by the thermostat. As long as the heating is turned on, the cycle starts, regardless of whether the coolant is cold or hot.
Facilitate the organization of air flow, the radiator is arranged in the front of the vehicle. However, due to the limitation of the vehicle layout space, an air conditioning condenser is also arranged in front of it, which will increase the wind resistance and affect the air inlet volume of the radiator, thus affecting the cooling system. cooling capacity. The fan is arranged behind the radiator and driven by the fan motor.
Post time: Jan-16-2024