内燃机的速度特性和负荷特性都只能表达两个参数之间的关系，为了表示三个或者三个以上参数之间的关系，可以采用多参数特性，即万有特性。
采用基于L - M算法的BP神经网络对某发动机万有特性进行研究。
Using backpropagation neural network based on Levenberg-Marquardt algorithm, the universal characteristics of engine were investigated.
推导了三次多项式插值公式和三次多项式插值余项，绘制了发动机万有特性曲线。
The formulation of cubic polynomial interpolation and the remainder of cubic polynomial interpolation were deduced and the engine fuel consumption characteristics map was drawn by this method.
本文采用曲线拟合及曲面拟合的方法，对商用车发动机外特性和发动机万有特性进行数学模型描述。
It is identical curve surface or curve in this paper. Business car engine's characteristics describe with mathematics' model.
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