Piezoelectric fuel injector driver with online adjustment

Abstract

The invention provides a piezoelectric oil injector driving device capable of being adjusted online. The piezoelectric oil injector driving device comprises a man-machine interaction module, a microcontroller, a DAC conversion unit and a driving voltage closed-loop control circuit. The man-machine interaction module is used for setting a driving voltage parameter value of a piezoelectric oil injector online and sending the driving voltage parameter value to the microcontroller connected with the man-machine interaction module. The microcontroller is used for generating a signal controlling the driving voltage closed-loop control circuit to work. The output end of the DAC conversion unit is connected with the piezoelectric closed-loop control circuit. The piezoelectric closed-loop control circuit is used for charging a piezoelectric oil injector under the condition that the piezoelectric oil injector is limited by the maximum value of charging current in the process from action starting to oil injecting, so that the driving voltage of the high end of the piezoelectric oil injector becomes small from large until the driving voltage reaches the driving voltage corresponding to the set driving voltage parameter value and is maintained in the oil injecting process. The driving voltage closed-loop control circuit is further used for discharging of the piezoelectric type oil injector. According to the piezoelectric oil injector driving device capable of being adjusted online, online flexible control over the driving voltage of the piezoelectric oil injector is achieved, and therefore compared with the traditional manner of frequently replacing hardware devices, simplicity and rapidness are achieved, and efficiency is high.

Description

technical field [0001] The invention relates to the technical field of high-pressure common rail for diesel engines, in particular to an online-adjustable fuel injector driving device. Background technique [0002] At present, in China, compared with the traditional solenoid valve actuator (solenoid valve injector), the research on high-voltage common rail piezoelectric actuator (such as piezoelectric injector) started late and is not mature. Piezoelectric crystal actuator Use its inverse piezoelectric effect to convert electrical energy into mechanical motion. Therefore, the driving force and stroke of the common rail piezoelectric actuator are determined by its driving voltage. In order to achieve the best driving performance of the piezoelectric actuator, during the entire fuel injection process , the voltage at both ends of the piezoelectric actuator should remain unchanged, and the driving voltage of piezoelectric actuators with different mechanical parameters is also d...

AI Technical Summary

Problems solved by technology

The drive voltage adjustment of the piezoelectric actuator is realized by frequently modifying the hardware parameters of the comparator circuit. The modification process is cumbersome, time-consuming, and error-prone, and the standardization of hardware devices cannot achieve arbitrary adjustment of the drive voltage.

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