压电晶体柴油喷油器的驱动控制方法

Driving control method of piezo actuator diesel fuel injector

对压电晶体执行器进行精细控制,可进一步提高柴油机喷油器的性能。考虑能耗,散热和硬件成本等因素,采用开关式电压放大器,设计了压电晶体执行器的驱动模块。采用静态占空比调制(PWM)驱动的开环控制方法,控制MOSFET的开/关动作,来控制驱动电流。为解决开环控制标定工作繁琐的问题,提出了一种的充放电过程的控制参数自适应标定策略。在油泵台上进行实际测试,把仿真与在线得到控制参数应用于驱动模块的设计。结果表明:喷油器的快速响应特性及其喷油稳定性得到了保证,满足了柴油机实际运转的需求。

Precisely controlled piezo diesel fuel injector can improve diesel engine performance. By taking energy dissipation, heat sinking and hardware cost into consideration, a driving module using switching voltage amplifier was designed. A static open loop pulse width modulation （PWM） control method was proposed to control the charging/discharging procedure by turning ON/ OFF the MOSFET. As the solution of the difficult calibration of control parameters, an online self-tuning method was implemented. The application test was taken on the fuel bench. Control parameters were estimated through simulation and subsequently tuned online. The results show that the module assures fast response of the injector and stable injection quality, so meets the working requirement of the diesel engine.