【摘要】 主要研究了以发动机转速作为自变量,在不考虑具体的化学反应动力学过程而只考虑单步不可逆反应的条件下对Arrhenius公式中计算反应率的有关参数进行了修正,以此来对发动机的有害气体NO_x排放量进行预测。基于不同转速下通过电控单元(ECU)自动调节和控制发动机的空燃比(A/F)使其燃烧在接近化学计量比时,通过PC机对发动机的转速、空气和燃料流量的回归来建立预测发动机NO_x排放模型,并用其在外特性曲线上不同转速下预测NO_x的排放量。通过LPG发动机实验证明了该方法的可行性。结果表明,预测结果和趋势与试验数据吻合较好,并具有准瞬态预测的能力。更多还原

【Abstract】 This paper mainly investigates a NOx estimation method of internal combustion engine, which takes revolution, flux of air and fuel as variables to modify the parameters in the Arrhenius formula, and at the same time the ratio of air and fuel are controlled by ECU to reach the stoichiometry approximately. The regression of revolution, flux of air and fuel are used to set up the predictive model by PC. The prediction results and trend are in agreement with the test results at the full load running of LPG engine. This method has the capability to predict the NOx emissions quickly and feasibility under the qusia ?transient state.更多还原