变频燃油加油机系统节能与控制研究

Study on Fuel Dispenser Energy-saving and Control System Based on Variable Frequency Adjustment

针对普通燃油加油机泵送效率低和能耗大的问题,提出将变频技术引入加油机系统中。分析了变频燃油加油机的结构和原理,通过理论分析推导了系统数学模型。针对变频燃油加油机系统存在的超调量大、动态响应慢、稳态精度不足等问题,提出了一种模糊自适应PID控制策略,建立相应的数学仿真模型,并搭建变频泵送系统实验平台,进行了能耗测试。仿真和实验结果表明:采用模糊PID控制的变频控制系统超调量小、稳定性好,该方法对输入信号变化的响应具有更好的鲁棒性和快速性,显著改善了系统控制效果。随着电机频率的增大,燃油加油机的泵送效率先增大后减小,证明了加油机系统引入变频技术的必要性。与普通燃油加油机相比,采用模糊PID自适应控制的燃油加油机大大降低了系统能耗,节能率达43%以上,加注精度可控制在0. 2%内。

In view of the low pumping efficiency and high energy consumption of the fuel dispenser,the technology of variablefrequency is introduced into the fuel dispenser system. The mathematical model was established by theoretical analysis according to the structure and principle of fuel dispenser based on variable frequency adjustment. A fuzzy adaptive Proportion Integration Differential( PID) control strategy was adopted in the control system of fuel dispenser in view of the problems of big overshoot,slow dynamic response and low steady-state accuracy. The corresponding mathematical simulation model and pumping system experimental platform were established. Energy consumption test was carried out. Simulation and experimental results show that the control system has fast response speed,small overshoot and good stability by using fuzzy adaptive PID,which has better robustness and rapidity. With the increase of the motor frequency,the pumping efficiency of the fuel dispenser increases first and then decreases,which proves the necessity of introducing frequency conversion technology into the control system. Using the fuzzy adaptive PID control strategy as compared with a common fuel dispenser,the fuel dispenser based on variable frequency adjustment can greatly reduce the energy consumption of the system with the energy saving rate of more than 43% and filling accuracy of less than 0. 2%.