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With the rapid economic development, a large number of highway construction, China's expressway tunnel growing very rapidly. So far, China has become the world up to the tunnel, the longest in the country. As traffic increases, the tunnel has become increasingly serious pollution, affecting the appearance of the tunnel and traffic safety, so how the tunnel for fast, effective cleaning before us has become an urgent task. The tunnel is now used mainly cleaning brush tunnel car wash tunnel and high pressure water cleaning truck. Brush tunnel car wash is a traditional cleaning methods, inefficient, polluting the environment, etc., have gradually been eliminated; while high-pressure water tunnel car wash is a new cleaning method, because of its use of high-pressure water jet technology, clean environment high efficiency, has developed rapidly in recent years, relatively broad application prospects. Tunnel car wash water at high pressure, spray means is most critical parts in the cleaning process, it is the distance between the tunnel wall, is directly related to the cleaning efficiency and effectiveness. However, the current high-pressure water spray tunnel car wash device, mainly by the driver to manually adjust the distance between the eyes. Because the field of water jet atomization serious observational poor, plus the driver labor intensity, fatigue, this method is not reliable pitch will not only affect the cleaning effect, spray devices may also lead to a collision with the wall damaged device. So, for this situation, this article will computer technology and hydraulic control technology, designed an automatic control system that uses ultrasonic ranging and digital electro-hydraulic proportional control technology to achieve spraying device in the cleaning process automatically pitch, reducing the labor intensity of drivers, greatly improved work efficiency. Firstly, the design of the overall control scheme, then the control system according to the composition and performance requirements, a number of key components for the design calculations and selection, such as microcontroller, ultrasonic sensors, hydraulic cylinders, electro-hydraulic proportional directional valve, then down analysis of the PWM control technology and PID control algorithm, the total system design of the hardware circuit and software, and systems for all aspects of mathematical modeling, using MATLAB / SIMULINK software to analyze the system control performance. After properly calibrated, the system performance to fully meet the control requirements. Paper finally the key part of the system - Ultrasonic Ranging System studied experimentally.
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