基于频差法的涡流空气流量调节系统设计

Design of Vortex Air Flow Regulation System Based on a Frequency Difference Method

研究了一种基于频差法的空气流量算法,并根据此算法设计了一种基于西门子S7-200型可编程逻辑控制器(PLC)的空气流量智能调节系统。该系统消除了温度和压力对于空气流量测量的影响,并根据影响测量的两个因素对算法进行修正,优化了时间测量精度与进气道内空气流速分布算法,可实现对节气门开度的实时调节,使进气量始终与发动机工况相适应。该智能调节系统具有测量精准,动态调整的特点,具有一定的实用价值。

An air flow algorithm based on a frequency difference method was studied.Based on this algorithm,an intelligent air flow control system based on Siemens S7-200 programmable logic controller(PLC)was designed.The system can eliminate the influence of temperature and pressure on air flow measurement,modify the algorithm based on the two factors influencing measurement,and optimize the algorithm of time measurement accuracy and air velocity distribution in the intake port.The system can adjust the throttle opening in real time,and make the intake always adapt to the engine operating conditions.It has the characteristics of accurate measurement and dynamic adjustment,of a certain practical value.