Abstract: In order to give a further research on steady state and empty carrying dynamic state torque and  fuel consuming model and universal characteristics of engine,this text tries to carry on mathematical analysis respectively on a structure of neural model and many layer forward feedback  network structure models through neural network and make some quests towards model recognition of engine.Practice clarifies that in engine working  process,the dynamic state work condition has occupied 66%～80%,dynamical  and economic capability  signs of engine have certain difference between  the steady state  work condition and the dynamic state work condition.

Key words: neural network, engine, model recognition, back propagation neural Network