汽车专业毕业论.doc

西安航空学院车辆与医电系 毕业论文 题目:汽车发动机冷却系统维护 专业:民航特种车辆维修 班级:车辆1404班? 学号:1130703140413 姓名:李哲 指导老师:李全利 二〇一四年五月 摘要 作为汽车心脏的发动机，其结构越来越复杂，性能越来越优越。发动机的的维修能力已是汽车类人才能力评价的重要方面。汽车冷却系统的作用是保证发动机可以迅速达到理想的工作温度，并且无论环境和工作条件如何变化，始终保持在这一温度范围。无论是在极冷或极热的条件下，无论是在交通堵塞的城市环境中还是在高速公路上全速行驶，发动机必须能够同样高速地运转。现代的高效率发动机对于工作温度有着极其精确的要求。尽可能高效率地利用燃油对于尾气排放的控制系统也很重要。冷却液在缸盖和发动机缸体中的水道中循环流动时可以吸收热量，然后在水泵的作用下，使冷却液流入散热器，而车外的空气穿过散热器栏，是散热器中的冷却液冷却。系统中的冷却液的流量由一个节温器控制，可以保证升温和冷却之间的平衡。 Summary As the heart of automotive engine, its structure is more and more complex, more and more superior performance. Engine maintenance ability is one of the most important aspects of the car class talented person ability evaluation The function of auto cooling system is to ensure that the engine can quickly achieve ideal working temperature, and no matter how environmental and working conditions change, always stay in this temperature range. Cooling system is to prevent engine overheating, but also to prevent the engine too cold. After the cold start of engine, cooling system and ensure that the engine rapid heating up, as soon as possible to the normal operating temperature. Whether in extremely cold or hot conditions, whether in the urban environment traffic jams or full speed on the highway, the engine must be able to operate in the same high speed way. Modern efficient engine to the requirement of working temperature is very accurate. As efficiently as possible with fuel for exhaust control system is also very important. Coolant in the engine cylinder block and cylinder head can absorb heat circulation flow in the channel, and then under the action of water pump, the coolant into the radiator, and the outside air through the radiator, radiator is the cooling liquid cooling. In the system of coolant flow is controlled by a thermostat, can guarantee the balance between heating and cooling. This paper deals with the effect of the cooling system, composition, main structure, working principle, routine maintenance, fault testing steps an