基于神经网络的柴油机NO_x排放实时仿真模型

传统的NOx排放模型都是基于Zeldovich链式反应,其大量的计算无法满足HILSS(硬件在环仿真系统)实时仿真的要求。而根据各种影响因素与NOx生成量之间的映射关系,用神经网络方法来构建NOx排放模型是一种同时兼顾实时性和准确性的解决方案。所建立的基于BPNN的NOx排放模型,采用贝叶斯正则化训练算法提高BP网络的推广能力,具有简单、可靠和通用的特点,可以在一定程度上预测发动机瞬态工况的NOx排放。

A Diesel Engine Real-time NOx Emission Simulation System Based on Neural Network

The traditional NOx emission model based on Zeldovich chain reaction needs a lot of calculation time,couldn't meet the real-time demand of HILSS.So the neural network NOx emission model base on the reflection relationship between the amount of NOxand some direct influence factors is a good solution to the contrast of accuracy and real time demand.The BPNN is trained by Bayesian regularization,which updates the weight and bias values according to Levenberg-Marquardt optimization and so as to produce a network that generalizes well.The verify of NOx emission NN model shows it is simple,reliable and universal to other type of diesel engine,and this model even could predict the state of transient engine NOxemissions accurately to some extent.