Research on Drive Control of Piezoelectric Injector

Abstract

This article is based on PWM switching power supply technology, using high-performance SoC SCM ADμC841 as the main control unit and through the IGBT on-off control, the drive circuit of the piezoelectric injector is designed. The simulation model of the drive circuit is established by Matlab/Simulink. According to different current trends during charging and discharging, three current driving modes were simulated and analyzed. The test results show that the variable duty cycle based on current feedback uses an approximate trapezoidal current charging method, which not only has a faster charge-discharge speed, but also can effectively limit the maximum current, and has a stable charge and discharge process. Therefore, the variable duty ratio is the best driving method among the three driving methods.