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The article discusses the shortcomings of existing methods of accounting for engine operating time for the purpose of forming standards and modes of maintenance and repair. The results of testing a vehicle using specialized tools, including an adapter to the OBD diagnostic connector and a smartphone with special software, which allows registering, storing and accumulating data on the speed and load modes of the engine and the car, are presented. According to the test results, the drawbacks of registering the parameters of speed and load modes are analyzed by traditional characteristics in the form of mathematical expectation and variance of random variables. Methods of formalized display of the character of parameter changes in time are considered using autocorrelation functions and matrices of transition probabilities. The results of testing the analysis of the nature of changes in operating parameters in urban and mainline operating conditions are presented.

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Methods of testing vehicles for static lateral stability are considered. The object of the study is service of vehicles (trucks and specialized equipment) which have undergone the conversion. Subject of research is the procedure for testing vehicles for static lateral stability and the resulting errors. This article discusses the original method of testing vehicles for static lateral stability, eliminating the need for a stand with a tilt table and ensuring the equivalence of measurement to the method regulated by GOST 31507-2012. The authors proposed a method for testing a vehicle (RF Patent No. 2693140, published on July 1, 2019), which provides its placing on a horizontal supporting surface, creating a tipping moment relative to the longitudinal axis of the vehicle and brining the vehicle to an unstable position by means of a lifting device with a cargo system slings and safety ropes. In this position, the roll angle φ of the sprung masses is measured, the height of the center of mass h is determined; the angle α су of the static lateral rollover stability of the vehicle is calculated. It is shown that the developed test method will be equivalent to the method regulated by GOST 31507-2012.