发动机热管理系统优化外文文献翻译、中英文翻译、外文翻译

Optimization of engine thermal management system

Engine thermal management is from the angle of the whole system, integrated control engine, turbocharger and exhaust, cooling system and engine cabin heat transfer etc., improve circulation efficiency, reducing heat load, change control engine components of high and low temperature limit, temperature distribution and regularity, improves the cooling capacity of the engine's colleagues, keep the engine in good power nature, economy and emission performance and reliability.

Application of engine thermal management system technology, can effectively heat transfer system involved in the engine as a comprehensive system of consideration and get the accurate boundary parameters of the engine each fluid system, precise control of temperature and heat flux of each system, can guarantee the safe and efficient operation of the key components and system control. And the optimization of the heat transfer process, reduce the size and power consumption of cooling system, reasonable utilization of heat energy, reduce waste emissions, improve energy efficiency, reduce environmental pollution. There is significant difference between engine thermal management and traditional engine cooling system. From engine cooling to engine thermal management is not only a technological progress, but also a breakthrough in management and design ideas. Engine thermal management technology has become an important measure of engine energy saving, emission reduction, power performance, reliability and engine life.

The cooling fan mechanical drive cooling system in the traditional fan from the engine crankshaft through a belt drive, the cooling air depends on engine speed and engine speed is proportional to, rather than the actual engine operation cooling capacity, unable to accurately control the air flow through the radiator, thereby it is difficult to make the engine work in the best temperature, resulting in emissions is too high, the fuel economy and engine performance deterioration. In addition to the outside of the traditional cooling fan cooling sensitivity adjustment is not high, the power loss is also large, serious power consumption, such as power consumption of the fan can reach the total output power of the engine 10%. In order to

solve the problems appeared in the self controlled electric fan, the electric fan speed according to the coolant temperature and air conditioning cycle parameters to adjust, through the sensor and computer chip according to the engine temperature control operation, to provide the best cooling medium flow and fan speed to adjust cooling capacity, reduce heat loss, the engine at low temperature when the power loss, and excessive wear, inhibit the engine overheating, reducing noise and fuel consumption. The cooling fan of transforming the traditional control mode for intelligent control, the cooling capacity of cooling fan with engine cooling and automatic precise adjustment, improved engine preheating velocity, water temperature too hot or too cold to prevent, to maintain the best working temperature, but also avoid wasting a lot of energy, which reduce the fan 90% power consumption, save fuel 10%. In addition, in order to improve the efficiency of cooling fan, replace the arc straight blade cooling fan with a plastic fan wing; with wing section plastic and streamlined hood, the formation of streamline flow in the fan airflow entrance, can improve the efficiency of hydraulic fan. Finally, the efficiency of electric fan is 85%.

The traditional mechanical driven cooling water pump is driven by V or gear, and the running speed is proportional to the engine speed. Many studies show that the traditional water pump in water only 5% of the time is right, not the precise control of the flow through the radiator cooling medium, so it is hard to make the engine work at the optimum temperature, fuel economy and engine performance. The electronic control pump driven by the motor, the flow can be independently controlled. The electric pump without crankshaft drive, the installation location is flexible, can optimize the water pump characteristic design, at the same time because there is no gear or belt wheel drives, reduces cycle lateral V belt and gear of the pump bearing load capacity, reduce the loss of driving. According to the requirements of engine cooling, not only the speed of cooling water is supplied by the electronic control pump, but also the cooling state of the part load and the high speed condition is avoided, and the unnecessary power consumption is reduced. Guo Xinmin on the domestic loader cooling system control device is studied, in order to achieve automatic adjustment of cooling water pump speed regulating overflow flow proportional relief valve according to the temperature of cooling water by using scm. The results show that, when the