Research On Temperature Control Strategy Of Cold Creep Forming Of Automobile Air Conditioner Accumulator

As the "blood vessel" between air-conditioning compressor and condenser,automobile air-conditioning reservoir plays a vital role in automobile air-conditioning system.The forming process is mostly completed by hot forming technology,but the traditional hot forming technology has high energy consumption,long forming process and a large amount of greenhouse gases.Compared with hot forming technology,cold forming technology completes the extrusion process at room temperature without significant temperature rise and low energy consumption.Therefore,cold creep forming technology is selected as the processing technology of automobile air conditioning reservoir in this paper.In the production of automotive air-conditioning reservoir,the accuracy of cold creep forming temperature control will directly affect the quality and output of automotive air-conditioning reservoir.When the temperature is too high,cracks will appear on the surface of the formed products,which will affect the quality of the liquid reservoir of automobile air conditioner;When the temperature is too low,it will lead to the increase of the rigid strength of the formed material,resulting in the difficulty of extrusion,which will affect the output of the liquid reservoir of automobile air conditioner.Therefore,the design of a cold creep forming temperature control strategy with high control accuracy and fast response speed plays a vital role in the production of automotive air-conditioning reservoir.According to the principle of cold creep forming process and the characteristics of forming temperature control,the control strategy of intelligent algorithm and PID temperature control is adopted.Because ant colony algorithm has excellent search ability,it is selected as the optimization algorithm of temperature control.However,the ant colony algorithm is easy to fall into local extremum when dealing with the problem with large amount of calculation.Therefore,this paper improves its search strategy based on the ant colony algorithm,adopts the control strategy of the combination of improved ant colony algorithm and PID temperature control,uses the excellent optimization ability of the algorithm to realize the self-tuning of PID temperature controller parameters,and establishes the mathematical model of cold creep forming temperature control.In the MATLAB simulation software,the temperature controller model of cold creep forming is built with the help of Simulink.The simulation experiments of conventional PID control strategy,PID control strategy based on ant colony algorithm and PID control strategy based on improved ant colony algorithm are carried out respectively,and the advantages and disadvantages of the three control strategies are compared.Through the analysis of simulation experimental data,the results show that the improved ant colony algorithm PID control strategy designed in this paper is superior to ant colony algorithm PID control strategy and conventional PID control strategy in system overshoot,adjustment time and system response speed,and verify the rationality of the control strategy.At the same time,the hardware and software parts of the cold creep forming temperature control system are selected and designed.Through the communication connection between the upper computer and the lower computer PLC controller,the functions of real-time temperature monitoring,alarm and reminder of the cold creep forming temperature control system are realized,which is convenient for users.