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针对预混式煤层气发动机转速扰动引起的进气系统压力波动产生的空燃比变化,提出了一种适合预混式煤层气发动机的空燃比控制方案。在基于所建煤层气发动机模型的基础上,分别采用PID控制策略、模糊控制策略和模糊PID控制策略对该控制方案进行了研究和仿真。仿真结果表明,三种控制策略中基于模糊PID控制的控制效果最理想,系统的稳定性和鲁棒性更好,且较好地解决了转速扰动造成的空燃比变化问题。
Aiming at the change of the air-fuel ratio caused by the pressure fluctuation of the intake system caused by the disturbance of the premixed coal bed methane engine speed, an air-fuel ratio control scheme suitable for a premixed coal bed methane engine is proposed. Based on the built coalbed methane engine model, PID control strategy, fuzzy control strategy and fuzzy PID control strategy are respectively used to study and simulate the control scheme. The simulation results show that the three control strategies based on fuzzy PID control the best control effect, the system stability and robustness better, and better solve the speed change caused by the disturbance of air-fuel ratio.