旁通阀控制策略对增压汽油机瞬态响应性能的影响

摘要

For a turbocharged gasoline engine with waste‐gate valve ,the steady model was built with GT‐Power software based on the combination of simulation and test .Transient simulation model of turbocharged gasoline engine was established by using the combustion model optimized by BP neural network .The waste‐gate control strategy was optimized by adopting PID control method and the transient response parameters such as brake mean effective pressure (BM EP) ,transient response time and turbocharger transient speed were analyzed .The results show that the transient response time of the gasoline engine short‐ens obviously at medium and high engine speed after using the optimized waste‐gate control strategy .Besides ,the strategy guarantees turbocharger to operate within a safe range of boost pressure and turbocharger speed .%针对带旁通阀的废气涡轮增压汽油机，采用试验和仿真相结合的方法建立基于GT‐Power的汽油机稳态模型。运用BP神经网络法建立燃烧模型，得到增压汽油机瞬态模型。采用PID控制对原机旁通阀控制策略进行优化，通过优化后的旁通阀控制策略对汽油机瞬态响应质量参数———平均有效压力、瞬态响应时间和增压器瞬态转速进行分析。结果表明：优化后的旁通阀控制策略可以在汽油机的中高速范围内显著地缩短发动机的瞬态响应时间，同时保证汽油机增压压力与增压器转速都处于安全范围之内。