摘要：为解决天然气发动机氧闭环系统中存在的时滞问题，提出基于内模控制（internal model control, IMC）原理的氧闭环控制策略，基于系统的鲁棒性对控制参数进行整定。建立基于传递函数的发动机物理模型并进行标定与验证，对控制策略进行GTPower与Simulink联合仿真验证、台架试验验证。仿真及试验结果表明：基于IMC的氧闭环控制策略能有效解决时滞导致的控制难题，且标定周期短、控制器的鲁棒性强，在数据失配20%时依然能够达到良好的控制效果。
Abstract：In order to solve time delay problem of oxygen control for heavy duty nature gas engine, a oxygen control strategy based on internal model control(IMC) is developed and calibrated by parameters in consideration of control robustness, and the engine model based on transfer function is also built. The IMC control strategy model is simulated by using Simulink coupled with GTPower, and validated by experiments in test bench. Simulation and experiments indicate that IMC based oxygen closedloop control strategy is effectively for the control problem caused by time delay, and work for calibration is reduced. The system is more robust, even if 20% deviation occurs in the model, the system performances are quite well.
Keywords:natural gas engine; excess air coefficient; oxygen closeloop control; IMC