Development Of An Auxiliary System For Inertia Parameters Of Powertrain Testing

This paper has researched and developed an auxiliary system for inertia parameters of powertrain testing. This system is consisted of a complete set of theory methods, practical software, operation specification and other related technical documents those can estimate the inertia parameters of powertrain before testing and examine the rationality of the testing result of inertia parameters after testing.Firstly, this paper has researched the relationship between the feature dimensions of a typical kind of powertrain and its inertia parameters. The feature models of powertrain were researched and the method for measuring the feature dimensions of feature model has also been researched. The method for estimating the inertia moment and product of inertia and other inertia parameters of powertrain by measuring mass and feature dimensions before testing was presented.Then, there are nine necessary inequality conditions that inertia parameters of powertrain must satisfied are derived from the definition of inertia parameters. By these inequality conditions, the correctness of the test results of inertia parameters can be judged. Because if a group of test results of inertia parameters are not satisfied with one of the nine inequity conditions, then this group of test results must be wrong. There are two kinds of definition formulas for product of inertia are also researched, and the corresponding formulas for compositing the inertia parameters of engine and transmission to get the inertia parameters of powertrain are given.Based on the present research, this paper improved the method for solving the inertia equivalent body of powertrain. The method for further examining the test results of inertia parameters by comparing the relative location and orientation between inertia equivalent body and the feature body was given.A practical 3D interactive software base on the techniques mentioned above was developed by MFC and OpenGL toolkit on Visual Studio 2008 platform. When the test data of feature dimensions of powertrain was input to the software, the inertia parameters of the powertrain can be estimated before testing. When the test data of inertia parameters of the powertrain was input to the software, the rationality of the test data can be judged automatically. According to the relative position and orientation between the inertia equivalent body and feature body generated by the software automatically, the rationality of the test data can be future evaluated.Finally, the specification document and help document of the software were edited for enterprise stuff training.All the research mentioned above are closely related to the problem that the inertia parameters testers have no idea to check the rationality of the test result, and have to accept the test result blindly, thus often lead to error. In this paper, a useful tool for inertia parameters testing was present, which is very important in the field of engineering application.