高压共轨喷油器电磁阀新型驱动控制技术研究

Research on New Driving Control of Solenoid Valve of High Pressure Common Rail Injector

为研制快速响应且稳定可靠的喷油器电磁阀驱动电路,分析了电磁阀的工作原理,建立了驱动电路模型,研究了驱动电路中影响电磁阀响应速度的关键因素。采用BOOST电压变换技术,设计了基于电流反馈控制的高低压分时驱动电路。驱动电路通过比较单片机提供的参考电压与驱动电流的采样电压,实时自动地控制峰值电流和维持电流,产生需要的电流波形,并能够较好地保证驱动电流的一致性。针对某型喷油器进行了驱动试验,结果表明:驱动电路响应快,电磁阀电流从0升至22A仅为0.045ms,同时可灵活改变驱动电流波形,驱动电流峰值一致性好。

In order to develop the driving circuit of an injector solenoid valve with fast response and stable performance, analyzing the working principle of a solenoid valve, modeling its driving circuit, and researching key factors affecting electromagnetic response speed in the driving circuit are carried out. A high and low voltage time-sharing driving circuit is designed with BOOST step technology based on current feedback control. The circuit automatically controls the peak and holding currents of a solenoid in real time, produces needed driving current and maintains good consistency of driving current by comparing the sample voltage of the driving current with the reference voltage from MCU. An experiment of the driving circuit is conducted on an injector and result shows that the new driving circuit has fast response, with only 0. 045 ms for driving current rising from 0 to 22 A, good flexibility in adjusting the form of driving current and good consistency of peak driving current.