Research On Temperature Control Of T_iO₂ Thin Film Fabrication Used By Automobile

Automobile safety has become an important influencing factor on the sustainable development of Chinese automobile industry. Auto safety can mainly be divided into active safety and passive safety. In this paper, the visual enhancement system in the active safety of vehicles has been studied. A kind of self-cleaning T_iO₂ nano-coating was brought forward. The doors, windows and mirrors of the automobile can repel fog under the help of T_iO₂ thin film. T_iO₂ thin film can also clean air. The experiments show that the substrate temperature will have an impact on the performance of coated glass. In the case of suitable substrate temperature, thin film of smoothness, high density and good crystalline on a glass substrate can be formed. Therefore, the substrate temperature is essential of the film quality and must be controlled.At present, the domestic control study of T_iO₂ coating device has just started. Preparation of T_iO₂ films largely is based on the experiences by manual control and open-loop control mode was used. In this paper, T_iO₂ substrate temperature was controlled by SCM on the closed-loop control. The quality of film-forming was improved. The control system hardware and software were designed. The substrate temperature of system is free to be set up at the beginning which can be displayed to the user. Fuzzy PID algorithm was chosen .The result of fuzzy PID operation will be associated with the output of voltage regulator. Then the control voltage with high accuracy can be got. Because the digital voltage regulator has no sliding contact and the system used MOC3041 SCR by zero-crossing trigger, it makes the output of AC voltage waveform continuous and virtually undistorted, and even does not produce high-order harmonic radiation of space.The same time, the entire system was modeled and simulated. Simulation results show that using the algorithm designed in this paper, the system works smoothly. Even if the external environmental factors have changed a lot, the system control performance still has a good dynamic quality and steady-state accuracy. The experimental results show that the quality of theT_iO₂ thin film was greatly improved under the control of the computer.The study of T_iO₂ nano-coating is of great practical significance for automotive active safety and is one of the development projects for automotive active safety technologies in the future.