When volume efficiency is computed by an engine cycle simulation considering gas flow in intake and exhaust manifold as one-dimensional unsteady flow, improperly given parameters in the simulation may cause an error over 5%.

• 摘要采用进排气管流动为一维非定常模型的发动机循环模拟方法计算充气效率时，若模型中给定的参数不合适，可能引起充气效率的计算误差超过5%25。