Design and implemention of an automobile multi-functional tester based on usb data acquisition card

In order to meet the requirements of automobile vibration signal processing, analysis and automobile performance parameter testing, an automobile multi-functional tester is realized by using Matlab and Delphi mixed programming technology based on USB data acquisition card, which possesses such functions like eight-channel signal data acquisition and storage, signal processing and analysis(specially time-frequency combination methods). By using the Component Object Model (COM) technology, M Matlab files can be compiled and become the dynamic link library (DLL) files. The DLL files can be installed and called on the Delphi platform to carry out nearly 30 signal processing and analysis methods for the tester. Some novel time-frequency combination methods are proposed and implemented to be used to analyze non-stationary signal to effectively extract signal frequency characteristic information. The developed tester is used to test four sensors of the PASSAT automobile electronic control test-bed, and analyze a simulation signal, and analyze the vibration signals sampled from a FOTON type engine. Through comparing their results, the tester is validated to be effectiveness. This tester can also be applied to other fields of vibration signal processing and analysis. © 2020, Politechnica University of Bucharest. All rights reserved.