能量平衡模型的涡轮增压器控制

摘要

以废气涡轮增压器控制机构的物理模型为基础,应用能量平衡方程与力平衡方程,对涡轮机构和控制机构建立数学模型,确定增压压力和控制电磁阀占空比的关系.采用PID(proportion-integral-derivative)控制方式控制输出占空比,使实际增压压力跟随目标增压压力.实车试验结果表明,增压压力跟随效果良好,相比于预存脉谱式控制系统,压力偏差值变化更小且平稳,控制系统可行.%Based on the physical model of the exhaust turbocharger control mechanism, the mathematical model for the turbine mechanism and the control mechanism is established by the energy balance equation and the force balance equation, which determines the relationship between the boost pressure and the duty cycle of the control solenoid valve. Using PID (proportion-integral-derivative) control mode to control the output duty cycle to make sure the actual boost pressure follows the target boost pressure. The vehicle road test results show that the boost control effect is good. Compared with the pre-pulse control system, the pressure deviation value changes more smoothly. The control system is feasible.