| Vehicle chassis dynamometer is one important equipment used to measure the performance of vehicle. In this paper, the detection and control system and the software platform for the first domestic vehicle chassis dynamometer developed by Shandong University of Technology have been improved based on previous experience and large amount of reference. Firstly, vehicle chassis dynamometer's configuration and working principle have been described simply. The paper gives the mathematical model of this detection and control system. The Fuzzy-PID control method is introduced to improve the process of simulating the real situation in the lab as vehicle run on the different roads after such more problem as nonlinear, steady state error and swing presented in the test and the character of this detection and control system was analyzed. Simulation research of the time variation and lag control system using Fuzzy-PID algorithm have been carried out. The Fuzzy-PID controller suitable for this system was designed and parameters of this controller have been set up by so many experiment. The paper also gives the regulation table of fuzzy logical reasoning. Secondly, the database application in use for store and query testing data and the precision timing of sampling was achieved using visual programming language. Also, it is available that the PID controller equipped with interface of fuzzy reference is realized using dynamic link library(DLL).The testing data on this dynamometer of CA1026LF truck and the analysis of results have been presented in the end. The results show that the dynamic and steady behavior and the measurement accuracy have been advanced as Fuzzy-PID controller was introduced. It is proved that the Fuzzy-PID controller works well in this control system. In addition, the software is compiled with block design method which is efficient and convenient to maintain. Human-computer interaction and the ability to process testing data qualify the demand of measure and test of vehicle. |
