| This paper introduces the production process of vehicle licenses, giving a brief illumination to the first domestic auto vehicle licenses production line, and through the analysis of main control task of auto vehicle licenses production line, we choose drying system of production line as the study object. The traditional drying control system sometime could not meet evaporation rate requirements in all kinds of environment conditions, and wasting energy seriously. This paper try to design a energy optimized drying control system which could work with all weather situations. The paper starts with water evaporation model, establishing formulations between fan watt and wind speed, humidity model and temperature model, and making analysis to them.Based on these analysis, the paper make a further discussing to optimized energy working point of drying system. This paper adopted the method of establishing critical working line of system, and decrease static optimized range to avoid to figure out mass of complex differential-eguations. The paper also illuminates the limit work environment, and make a brief analysis of parameters adjustment under this environment.Finally, the paper study the three situations when system does not work on static work point: in the part of balance point controlling, the paper study the control strategy when working state is close to static work point; in the part of critical work controlling, the paper study how to push the state point to static work point; in the part of pre-heat controlling, the paper study the control of start time. The paper study the principle of state point's movement in state space, and through the energy optimized control arithmetic, to reach the aim of energy optimized control. The paper also proposes a soft measurement to internal humidity which is hard to measure.The vehicle license production line has been already put into using, and system performs well. |
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