Prediction NOX Emissions for High Speed DI Diesel Engine Based on PSOBP

Abstract

In this paper, BP neural network (BPNN) is studied to model and predict NO X emission of direct injection diesel engine. The model selects four parameters as input, namely rotation speed, load, exhaust temperature and fuel-air ratio. Through testing, it is concluded that the prediction performance of BPNN model will be greatly affected by the initial weight and threshold, so that the prediction accuracy of the model is not high. In order to reduce the influence of initial weight and threshold on the prediction performance of BPNN model, this paper adopts Particle Swarm Optimization (PSO) algorithm to optimize the initial weight and threshold of BPNN, and establishes the corresponding prediction model of NO X emission of diesel engine. The results show that the prediction model of BPNN optimized by PSO algorithm can effectively reduce the influence of initial weight and threshold on BPNN and make the prediction results of the model more reliable. In particular, when PSO adopts non-linear dynamic weight strategy and synchronous learning factor strategy, the prediction performance of BPNN model is more provided with reliability.

Prediction of NOx considering NO and NO2 for a CI engine

“…Several recent studies have aimed at estimating NO x emissions through a neural network or by using regressive methods. 9,10 Tan et al 10 developed an NO x emission model for a diesel engine by using a neural network with an optimization algorithm. Alcan et al 9 employed a sigmoid-based nonlinear autoregressive model with an exogenous input to predict NO x emissions of a diesel engine.…”