Introduction (problem statement and relevance). Operation of an electric vehicle transmission in such driving modes as acceleration with speeding-up and braking with recuperation of energy leads to a sign-variable change in the driving torque and necessitates consideration of gaps affecting characteristics of torque and angular velocity fluctuations. Present-day computer simulation programs allow to increase the accuracy of calculations through consideration of gaps in a transmission with precise geometrical dimensions and parameters. The relevance of the study is determined by simulation result accuracy increase.
The purpose of the study is to assess gaps arrangement and dimensions influence on drive power and kinematic performance variation.
Methodology and research methods. The study uses computer simulation and virtual test methods.
Results. A transmission dynamic model has been developed with consideration of gaps localization and dimensions. The study was performed in two stages: at the first stage, influence of gap localization on the fluctuation parameters was studied, at the second stage, influence of the specified gap dimension was studied. It was found that gap localization on the output shaft raises the fluctuation range up to 10 times for the drive torque, and up to 4.5 times for the angular velocity. The output shaft gap increase leads to an increase in the fluctuation range by 50% for the torque and by 30% for the angular velocity.
Scientific novelty of the study consists in development of a new dynamic model of a passenger vehicle transmission allowing estimation of a degree of gap localization and dimensions influence on dynamic characteristics.
Practical significance consists in the results of the calculation study, which will be used in development of electric drive active control with precise torque input adjustment.

Introduction (problem statement and relevance). At present, use of autonomous mobile driverless transport and technological vehicles (DTTV) became widespread when working in areas with harmful and hazardous factors. Also, these vehicles can be used for search and rescue operations, cargo delivery to hard-to-reach areas, and other similar tasks. Therefore, higher requirements are applied to these DTTV reliability, including load-bearing elements fatigue strength, as during their operation some conditions can arise which will not allow performance of timely repair activities to bring the vehicles to the operable state. This paper considers the issues of influence of load-bearing system compliance on the loads appearing during operation and their influence on durability parameters.
The purpose of the study is to identify influence of transport and technological vehicle load-bearing system stiffness on suspension guiding device fatigue strength.
Methodology and research methods. The paper presents a dynamic mathematical model of a wheeled vehicle for determination of loads created in solid body dynamics simulation software; a procedure for simulation results processing; fatigue strength calculations for suspension guiding device elements made with the use of the finite element method allowing assessment of influence of load-bearing system compliance on accumulated damage rate.
Scientific novelty and results. The paper presents DTTV motion simulation results, analysis of the obtained results for absolutely rigid and compliant load-bearing systems. Recommendations for creation of calculation models have been given for further calculations of fatigue strength. As a result, the damage rate in the suspension guiding device elements has been obtained, and analysis of the results has been performed. Also, checking calculations of the load-bearing system have been performed to analyze the changes in its strength.
Practical significance. The obtained results can be used in development of highly loaded elements of wheeled vehicles.

Introduction (problem statement and relevance). A traction battery (TB) is one of the most important components of an electric vehicle determining its cruising range, performance and service life. However, the TB generates significant amount of heat during operation, which affects its performance and service life. Therefore, the TB cooling system plays an important role in keeping the battery temperature within a safe range providing stable operation and extending its service life.
The purpose of the study is modeling the cooling system in Simulink in order to analyse the factors influencing the performance of the VinFast VF 8 electric vehicle TB.
Methodology and research methods. Analysis of TB operation conditions for optimization of its performance and service life. Evaluation of TB cooling system efficiency under different operation conditions. Testing of the system model for evaluation of efficiency under different operation conditions. Experimental data analysis for evaluation of efficiency of the TB cooling system and proposing solutions for its improvement.
Scientific novelty and results. Within the study, the authors developed and modeled the electric vehicle TB cooling system with application of the Worldwide Harmonised Light Vehicles Test Procedure (WLTP) driving cycle in Matlab Simulink. The accuracy of the model was evaluated and checked by comparing the modeling results with the experimental data, which contributes to the reliability of the model. The influence of the coolant flow rate and air flow rate through the radiator on the TB liquid cooling process was analyzed.
Practical significance. Modeling of the TB cooling system in Matlab Simulink is an effective method of system performance evaluation before its practical implementation. The created model will help engineers and researchers analyze the factors influencing the TB temperature, test different cooling strategies and optimize the system design.

Introduction (problem statement and relevance). For several decades, the issues of development of a comprehensive system of inspection of safety of tanks for transportation of dangerous goods within the Agreement concerning the International Carriage of Dangerous Goods by Road (ADR) dated 30 September 1957 have been staying relevant.
The purpose of the study is to improve efficiency of ADR implementation in the Russian Federation.
Methodology and research methods. The study analyses activity of technical authorities and regulatory & technical base including standardization documents. The Russian Federation conformity assessment system organizational structure within the ADR is presented as a prospect of development of technical regulation of tanks for transportation of dangerous goods in order to improve traffic safety.
Scientific novelty and results. Recommendations and proposals on organization of primary tests for domestic plants for manufacturing of tank trucks or road tankers for transportation of dangerous goods are formulated in order to ensure manufacturing of high-quality products and compliance with the ADR requirements. Risk analysis has been performed, and approaches to organization of internal inspection services at the manufacturers (manufacturing plants) have been considered, as well as an algorithm of assessment of such services. Analysis of international experience of conformity assessment process organization for tanks for transportation of dangerous goods within the ADR has been performed, and issues of stakeholders empowerment (accreditation/notification) have been addressed.
Practical significance. The formulated proposals will make it possible to improve efficiency of implementation of the ADR provisions in the Russian Federation.

Introduction (problem statement and relevance). Launching series production of a new vehicle family and commissioning thereof comes along with the task to develop operational and service documentation for after-sales maintenance, in particular the spare parts catalog. The paper formulates requirements for the future spare parts catalog, presents differences between the engineering and service bills of materials of products, describes examples of formation of components of a service bill of materials based on the engineering bill of materials.
The purpose of the study is to describe peculiarities of development of spare parts catalog modules based on the design documentation of a new vehicle family.
Methodology and research methods. Analytical studies were conducted, and solutions for refinement of an engineering bill of materials up to the service bill of materials level were found.
Scientific novelty and results. The paper describes three examples of spare parts documentation development based on engineering bill of materials components: 1) components of the engineering bill of materials become spare parts and are transferred to the service bill of materials in their original form, preserving the identifier and visualization; 2) in case of an indecomposable assembly, only the main assembly becomes a spare part, and the components incorporated therein are not included in the service bill of materials; 3) in the service bill of materials, new spare parts are created with separate numbers and visualization which are physically present in the main assembly supplied to the assembly line.
Practical significance. Based on the study results, a spare parts catalog for the new luxury vehicle family is developed and supplemented.

Introduction (problem statement and relevance). Starting diesel engines at low temperatures is one of the critical tasks in truck operation. Organizing of the start requires auxiliary equipment, complication of the engine and vehicle design and, as a consequence, their cost increase, as well as additional maintenance. Starting a cold engine at low temperatures is accompanied by reduced engine life, excessive fuel consumption and increased hazardous substance emissions in exhaust gases. Starting characteristics of vehicle diesel engines depend on their design and performance parameters: compression ratio, fuel supply parameters, crankshaft antitorque moment, electric starting system power, properties of fuels and oils used, etc.
The purpose of the study is to assess the influence of compression ratio and viscosity of engine oil on the starting characteristics of a truck diesel engine.
Methodology and research methods. The paper uses theoretical bases of study of starting characteristics of internal combustion engines, assessment of engine operation process parameters during starting, as well as theoretical bases of chemmotology. The experimental studies were performed using modern procedures and with certified equipment.
Scientific novelty and results. A comprehensive approach to assessment of starting characteristics of a diesel engine was developed, and an algorithm of starting tests was created; theoretical assumptions about the influence of compression ratio and kinematic viscosity of engine oil on engine starting characteristics were confirmed.
Practical significance. The study results can be used to optimize engine operation parameters at low temperatures, which is especially relevant for regions with cold climates.

Introduction (problem statement and relevance). It is known that a short cruising range is one of the main disadvantages of electric buses. In cold climate regions, an electric heater can consume more than 50% of the total energy, which significantly affects the range. Installing a liquid heater that operates on diesel fuel can considerably compensate for this disadvantage, however, use of such system is connected with emissions of combustion products that can penetrate into the passenger compartment.
The purpose of the study is to determine emissions of harmful substances in exhaust gases of a diesel heating installation and to define air quality parameters in the passenger compartment of the KAMAZ6282 electric bus during operation of such heater.
Methodology and research methods. The study was performed in compliance with the requirements of GOST 33554-2015 and UN Regulation No. 122.
Scientific novelty and results. The study presents results of testing for emission of harmful substances with exhaust gases of an electric bus diesel heater. Compliance with the GOST 33554-2015 requirements in terms of air quality in the passenger compartment has been determined. Comparison with other vehicle types in terms of specific emissions has been provided.
Practical significance. This study results can be used to improve environmental performance of electric passenger transport.

During the vehicle type approval procedure, ERA-GLONASS devices/systems are subject to a significant number of tests, which is determined by the requirements of a number of national regulatory documents. Meeting the requirements ensures appropriate functioning, user safety and compatibility with other on-board electronic equipment of the vehicle. The most frequently occurring non-conformances of the ERA-GLONASS devices/systems in the course of testing were analyzed. The main types of non-conformances were determined by the nature of their occurrence. The causes of occurrence of nonconformances due to imperfections in software and hardware were identified. Analytical studies were conducted to determine criticality of frequently occurring non-conformances of the ERA-GLONASS devices/systems in the course of testing.

Introduction (problem statement and relevance). There are many international and national standards describing test procedures and measurement methods for volatile organic compounds (VOC) in vehicle passenger compartments. These standards set unified requirements so that the selected vehicles are under approximately the same conditions to enable comparison of the VOC content results obtained. At the same time, now there are no GOSTs (state standards) or technical regulations either in the Russian Federation or in the Customs Union containing requirements for maximum concentrations of VOC coming from interior parts into the vehicle passenger compartments.
The purpose of the study is to formulate recommendations in the field of regulation and monitoring of main VOC content in a new vehicle passenger compartment in order to reduce their negative effect for Russian vehicle manufacturers based on analysis of scientific literature, technical documentation and AvtoVAZ JSC experience.
Methodology and research methods. Analytical review of global studies dedicated to VOC emissions in vehicle passenger compartments, VOC influence on health and physical state of occupants has been made, analysis of VOC standards and methods of VOC identification and measurement applied worldwide has been conducted, AvtoVAZ JSC experience in the field of vehicle passenger compartment air quality management has been used.
Scientific novelty and results. Summary and analysis of international experience in studying VOC emissions in vehicles. Justification of relevance of introduction of standards for eight VOC maximum allowable concentration in vehicle passenger compartments in Russia in order to reduce VOC negative effect on human body.
Practical significance. The obtained results have confirmed the necessity to start public discussions regarding timing and procedures of introduction of legal requirements for new vehicle passenger compartment air quality in Russia. The long-term result should be development of a Customs Union technical regulation for maximum allowable concentration of eight VOCs in a new vehicle passenger compartment in order to limit their negative effect on human body, improve safety and environmental friendliness of vehicles.

Introduction (problem statement and relevance). Since the information on the dependence of perforated plates geometric parameters and influence of their characteristics on suppression degree when transmitting sound waves, as well as on resistance to the gas flow, is limited but required when designing noise suppressor elements of internal combustion engine gas exchange systems, there is a need to study this matter and to determine these interrelations.
The purpose of the study is to reveal the dependence of parameters of sound insulation capability and gas-dynamic resistance and the length of perimeter of various number of circular holes on given area of the sheet material surface with the same perforation coefficient (equal total area of the holes).
Methodology and research methods. Experimental studies of various plate samples with perforation variants have been performed using laboratory facilities of FSUE “NAMI” Automotive Industry Product Testing Center, along with simulation of acoustic and gas-dynamic characteristics in the COMSOL Multiphysics and ANSYS software environment.
Scientific novelty and results. Parameters of sound transmission loss measured on the “Cold engineless installation” and backpressure measured on the “Air filter test bench” for perforated plates have been presented in comparison with the calculated values. It was revealed that there is an expressed dependence of the mentioned properties on the total perimeter length of the circular perforation holes of different diameter.
Practical significance. Analysis of the obtained results allowed the authors to make conclusions that the method of determining sound insulation properties of perforated structures in the impedance tube with normal sound waves incidence is in some degree limited in terms of its application and needs further research with other parameters of the acoustic environment.

Introduction (problem statement and relevance). Use of gases as engine fuel for automobile vehicle fleet in the territory of the Russian Federation is a modern and affordable solution to the problem of saving liquid petroleum-derived engine fuels. This paper considers the aspects of application of various gases as engine fuel for above-ground public transport in a megalopolis and presents various models and modifications of urban gas-powered buses starting from the first projects of domestic automobile manufacturers and continuing with the developments of more recent times.
The purpose of the study is to review the models of gas-powered public buses operated in megalopolises. The work was carried out in order to detect interdependence of performance characteristics such as a cruising range and gas cylinder capacity, as well as to determine influence of the bus body design type on arrangement of gas cylinders.
Methodology and research methods. In the process of preparing this paper for publication, information from open sources was searched, and secondary data was also used. Domestically manufactured gaspowered public buses used in megalopolises are considered as objects of the study.
Scientific novelty and results. The author conducted an analytical study aimed at detecting dependence between the cruising range (run or mileage) of a gas-powered city bus and consumption of the gas used as engine fuel, as well as influence of the bus body design type on arrangement of gas cylinders.
Practical significance. Based on the conducted research, one can determine dialectics of passenger transport development in megalopolises.