Design And Implementation Of High Precision Large Flow Real-time Flow Measurement System

There are two major measurement requirements in industry fuel system: fuel quantity measurement and fuel flow measurement.Fuel quantity measurement is one of the most important requirements in industry.Fuel flow detection can provide us with accurate information about fuel cumulative consumption and instantaneous consumption,checking the engine’s working status at the same time.Carrying out BIT test on engine fuel can supply and monitor parameters to assist engine control.At the same time,measuring the fuel flow has some advantages such as: reducing fuel consumption,protecting the environment,and lowering the cost.There for,it can be seen that the fuel flow detection parameter is one of the key parameters of industry engine control.With the development of the microelectronics industry,The application scenarios of flow sensors are becoming more and more complex in the industrial field.For flow measurement of a higher demand: high reliability-MTBF,measure-strongreal-time,high precision,anti-interference.This paper aims to solve the problems as follow: high-precision measurement needs to be carried out under a wide range of flow rates,ensuring the structural strength of fluid impact at large flow rates;It is not only does it measure the instantaneous flow rate but also perform high-precision calculation of the accumulated flow rate;what’s more that the structure of the flow sensor is simple-no complex electronic equipment which is allowed to appear near the fuel to ensure intrinsic safety,and solve the problem of electromagnetic interference in the process of signal transmission at the same time.These question above put forward new requirements for the new fuel flow measurement system mentioned in the paper,we need to do some research on the structural design of the flow sensor,parameter simulation,signal characteristic optimization,K-factor modeling,signal acquisition circuit optimization design,anti-interference design,and back-end measurement processor algorithms.This paper has already starting the following work: according to the relevant vibration,acceleration and other use environments,the flow sensor uses the intensity analysis software to conduct stress analysis simulation to guide the design;in the design of the "magnetic field-electricity" conversion device of the flow sensor,full theoretical analysis and for numerical calculation,the electrical signal is optimized by magnetic field simulation software;in addition,the modeling and simulation of the rotation ratio of the flow sensor requires fluid analysis software,using the torque balance when the impeller rotates at a constant speed as the analysis key;finally,combined with the actual engineering application,solve the interference problem of the flow measurement system in signal transmission,the anti-interference design of the back-end acquisition and conversion circuit of the system,the frequency acquisition and processing algorithm of FPGA programmable logic device,etc.,and finally realize the high reliability,real-time and anti-interference of the flow measurement system Requirements for use.