基于SPSS的凸轮型线拟合

Cam Profile Fitting Based on SPSS

柴油机在工程实际中广泛应用,而柴油机造成的排放污染也不断加剧。减少发动机有害物排放、提高发动机动力和降低燃油消耗已成为近年来国产柴油机发展的主要研究方向。研究表明柱塞面积与柱塞速度的乘积决定着油泵的供油率,通过改变凸轮型廓,可以有效地改变喷油泵的喷油压力、喷油规律和工作容量,从而有效地改善柴油机的性能。喷油泵柱塞的运动规律取决于凸轮轴的凸轮型线,如何设计和加工出具有合理型线的凸轮是喷油泵设计中很重要的问题。为此介绍了如何运用SPSS软件,从原始实测数据出发构造出喷油泵凸轮型线方程的方法,对合理设计凸轮的形状,提高喷油泵供油率及可靠性具有重要的意义。

With wide use of diesel engine in engineering practice,emission pollution caused by diesel engines is uninterruptedly increasing in recent years. Reducing harmful engine emissions,improving engine power and reducing fuel consumption become the main reseach direction of development of the domestic diesel engine. It is found that the product of the piston area and the piston speed determines the rate of the oil pump,by changing the cam profile,the injection pressure of injection pump,the law of fuel injection and working capaciby can be changed effectively,thus its performance is improved greatly. The movement rule of plunger of injection pump depends on the lines of the cam profile of camshaft. Therefore it is very important to design and manufacture the cam profile with reasonable lines in the design of the injection pump. This paper introduces the method in which SPSS software is used to construce the fuel injection pump cam profile equation based on the original data,it is of an important significance to designing the shape of the cam and improving the fuel pump supply rate and reliability.