【摘要】 在建立了发动机万有特性曲面拟合数学模型的基础上,利用MATLAB语言的矩阵运算、三维曲线绘图、等值线法等方法,提出了一种计算并绘制发动机万有特性的新方法。运用该方法,绘制了某发动机万有特性的等油耗曲线,根据此曲线对某载货汽车等速行驶燃油经济性进行了模拟计算,并与试验结果进行对比。对比结果表明,该方法具有直观、简便、精度高、实用性强等优点。更多还原

【Abstract】 On the basis of the math model of engine universal charateristic curve surface, by means of MATLAB′s matrix operation, 3D graphics drawing, and so on, a new method to protract engine universal characteristics was put forward. With this method, universal characteristic equal oil using curve of engine was drawn. Based on the curve, simulated calculation of oil using economic characteristics of a cargo carrying lorry was conducted. The results were analyzed in comparison with the test resultsThe method is of intuitiveness, simplicity, high precision, and strong practicality更多还原