| Cooling system is an important part of vehicle internal combustion engine and has an important impact on the performance of internal combustion engine.Inadequate cooling and excessive cooling of the cooling system will lead to the degradation of the vehicle’s internal combustion performance.With the continuous improvement of automobile economy,power and emission requirements,the research on cooling system is also increasingly more in-depth.On the premise of ensuring enough heat dissipation capacity,low energy consumption and high efficiency have become the development trend of cooling system components.As an important cooling device of the cooling system,the fan regulates the temperature of the cooling system so that the vehicle internal combustion engine can work in a moderate temperature range under different working conditions.Traditional mechanical and belt cooling fans will cause unnecessary power consumption and cannot meet the control requirements of modern automobiles.After continuous technical innovation,the application of PWM control technology in fans can overcome the energy loss caused by the associated engine speed fans and step fans and realize stepless variable frequency speed regulation of fans,which is also an important development direction of fans in the future.Calibration and matching are the key technologies of Frequency Conversion Fan.It is of great significance to carry out this research.This paper studies the calibration and matching of vehicle internal combustion engine.First of all,the paper analyzes the different driving modes and control modes of the cooling fan to understand the current research situation.On the basis of aerodynamics,the fan design method is analyzed and compared to find the design method that meets the requirements of this design and the performance of the fan is evaluated through the performance parameters of the fan.The GT-COOL three-dimensional front cabin simulation model is established for an engine of a certain vehicle type and the influence of fan installation position parameters on the cooling capacity of the fan is studied to provide a general reference for the fan installation position.The GT-SUITE engine-vehicle simulation model is established to verify the correctness of the model.Based on the standard road spectrum,the speed of the Frequency Conversion Fan is calibrated transiently with the coolant temperature as the calibration target.The fan model related to engine speed was established and the outlet water temperature and fan power consumption of the two fan models were compared and analyzed to verify the performance advantages of the Frequency Conversion Fan.The influence of relative speed on fan speed is analyzed,the speed of Frequency Conversion Fan is further optimized with reference to various ambient wind speeds and the fan speed MAP with combined ambient wind speed and engine outlet temperature as its control strategy is obtained. |
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