This article presents the results of the analysis of data from 500 vehicle control stations concerning periodic tests of passenger cars in the number of 2 million. Based on the collected data, a database of vehicles has been prepared to cover technical information, such as model, mass, engine capacity and maximum power. This information has been summarized with the exploitation data such as age of the car, distance traveled, the area in which the vehicle was most frequently used, the use for business or private purposes, and intensity of operation that was measured by the ratio of kilometers traveled to the age of the car. This information constituted a set of factors affecting the reliability of the car. Information about reliability itself was the results of control tests, including occurring defects and their significance. The occurring defects were codified, which allowed their allocation to particular categories describing car systems, such as steering, braking and driving. While the significance of the fault resulted from the test result: positive (minor defects) or negative (important defects). This article presents a factor and the correlation analysis of the database, which assesses which construction and operating factors have a significant impact on damages occurring in individual car systems.
The issue of energy recuperation is increasingly found in modern cars (both electric and hybrid, as well as powered by a combustion engine only). Road conditions are one of the essential factors determining the appropriateness of using certain design solutions in braking energy recovery systems. This article presents an analysis of road conditions prevailing in a large urban agglomeration together with an evaluation of their usefulness for utilizing the braking energy. Road tests were carried out for this purpose, and their analysis used the Monte Carlo method to determine the pseudo-accidental courses.
Analysis of vibroacoustic signals is one of the more frequently used mechanical devices diagnostic methods occurring among others in car diagnostics. Often, it happens that the most important element of the recorded course is the fundamental harmonic frequency of vibrations. Fundamental frequency indicates the main process related to the operation of the device and allows to follow its course. In the article the author's method of determining the fundamental frequency in the signal will be presented which is the subject of a patent application. Its theoretical basis and application examples were discussed comparing the accuracy of its use with the accuracy of other methods. The frequency range where the method finds application is shown. That is, where its accuracy turns out to be better than the accuracy of popular used methods to fundamental harmonic frequency determination.
The article discussed changes in the European Agreement concerning the International Carriage of Dangerous Goods by Road (ADR 2017) regarding the requirements for the construction of vehicles in the context of car inspection (PTI) in Poland. The changes also apply to some of the documents submitted for PTI ispection and issued by an authorized car diagnostician after an additional test.
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