The micro pressure difference method was used to measure fuel flowrate

which has the advantages of low pressure loss

high accuracy and fast response.A new orifice measuring section was designed

and a series of calibration experiments were done with different orifices.The experiments results show that the relation between flowrate and the square root of pressure difference was linear in the flowrate measuring range

which is in accordance with theoretical analysis.On the basis of the measuring method

a single neuron PID (proportion-integration-differentiation)controller was designed and used in the closed-loop control experiments of fuel flowrate.In contrast to open-looped control

this new control method is independent of pump characteristics

power voltage and outlet pressure.It also has good dynamic performance.In the end

the method was used in MTE(micro turbine engine) starting tests

which shows that it improves the quickness and reliability of start-up process dramatically.