Charged particles in the flame produced by combustion of hydrocarbon fuels provided an alternative control option via external electric fields. The liquid ethanol was used as fuel. A stainless steel tube with an inner diameter of 0.9 mm was used as the nozzle and an external direct-current electric field was applied. The voltage-current characteristics of a small scale diffusion flames under the electric field were identified. The combustion system can be assumed as an equivalent circuit model. According to the theory of circuit

the change rules of flame equivalent resistance were obtained. The ion production was used as a sensor and a classical simple PID closed control method was used to adjust the flame. The simulation results showed that the system designed in present paper had well anti-jamming capability. The present study can supply some certain guidelines for the control and stable operation of microscale combustor.