The article discusses the algorithms of the population's choice of the method and means of transportation around the city. The article presents three algorithms: the general algorithm, the algorithm for regular movements and the algorithm for urgent movements. The logic used in the developed algorithms is based on the materials of a survey of 1504 respondents in Tyumen in 2021. The algorithms take into account aspects that are associated with the risk of COVID-19 infection in urban transport. These algorithms can be used in research works to simulate the process of movement of city residents.

Keywords: algorithm, urban transport system, choice of mode of transportation, choice of means of transportation, urban transport

Transportation is one of the most important stages in the management of cement delivery, which accounts for 60% of total costs. Thus, a slight improvement in the collection and processing of data on the operation of concrete mixers can have a significant impact on the overall savings spent on the work of companies engaged in transportation. On the other hand, the movement of heavy vehicles carrying cement mixture leads to the spread of air pollution and damage to the road surface in case of excessive loading. Therefore, the issue of determining the route of the vehicle to achieve this goal is very important. In this study, the routing process of concrete mixers was modeled using random routing problems and genetic algorithms. The simulation results showed that the genetic algorithm converges to the optimal answer. On the other hand, the volume of the cost function decreases from 1,177,500 rubles to 158,900 rubles. due to the optimization of the mentioned model, and the performance result led to the appearance of the shortest possible path. With the help of the algorithm, all the parameters of sustainable development management are achieved, including reducing air pollution, reducing fuel consumption and reducing the destruction of the road surface. Finally, thanks to the integration of the GLONASS/GPS software, the output data of the algorithm was mapped to the map.

Keywords: optimization of routes, fuel efficiency, reduction of emissions, preservation of the integrity of the road surface, optimization, logistics, modeling, special car, urban operation

The article deals with the priority passage of regulated intersections by public transport using the method of extending the permitting signal. The relevance of the problem under consideration is due to insufficient study of the issue of choosing the optimal control parameters for the method of extending the resolving signal. Using simulation modeling, a study was carried out of the priority passage control process on two- and three-lane road sections. In the course of the experiment, the dependences between the extension time of the allowed signal and the cycle duration were determined at different ratios of the phase coefficients, as well as the optimal distance of the priority activation detectors. The obtained results of the research work can be used in the design of the urban intelligent transport system and when adjusting the control modes in the automated traffic control system of the urban agglomeration.

Keywords: priority movement of urban passenger transport, transport detectors, intelligent transport systems, simulation, traffic light control parameters

The article provides a solution to the problem of optimizing the frequency of maintenance on the example of the frame of a KamAZ-4308 truck. As an optimization criterion, it is proposed to use unit costs for a given time, including the costs of eliminating hidden failures. The calculation of the frame resource is carried out, the empirical and approximating functions of the general population of the finite volume are obtained.

Keywords: car, probability of uptime, maintenance, optimization, unit costs, reliability assessment

In recent years, hydrogen is of particular interest among alternative fuels for vehicles, which has a high potential for use as a motor fuel today. Hydrogen and its mixtures for transport really have good opportunities to replace petroleum gasoline. The article discusses the features of hydrogen as a fuel for thermal engines. Observed in the world in recent decades, increased attention to hydrogen as a fuel and energy carrier is determined by the following main features: hydrogen reserves are almost unlimited; hydrogen is a universal energy resource that can be used to produce energy by various technologies, be (stored, transported, used) in gaseous, liquid and bound states; among the types of organic fuel, hydrogen has the highest calorific value per unit mass and the least negative impact on the environment. The article presents a systematic analysis of the use of hydrogen in heat engines, .the features of hydrogen combustion are determined, the advantages and disadvantages of its application are shown on the basis of a comprehensive analysis. It is concluded that the more promising use of hydrogen in road transport is associated with the development of fuel cells

Keywords: alternative fuels, ecology, greenhouse gases, hydrogen, energy properties, fuel cells, internal combustion engine, motor transport

The largest cities of Russia have problems with the development of rapid transit passenger transport. A good solution to the problem is to replace the tram lines with rapid transit tram lines or light rail (LRT). One of the conditions of a light rail transit is to increase the distance between stopping points. A review of the literature shows that the question of the effect of the distance between stopping points on the tram speed is insufficiently studied. The aim of the study is to determine the relationship between the tram speed and the distance between the stopping points of the light rail system. The research method is simulation at the micro level in Aimsun. The study considered the speed limit, stopping time at stopping points, delays due to signalized intersections. Based on the simulation results, a relationship between the tram speed and the distance between stopping points was determined. The obtained relationship is of practical value and can be used for LRT planning and management in cities.

Keywords: high-speed tram, light rail, organization of the movement of trams, speed of communication, stop point, simulation

The article deals with the reducing issues the time spent of making informed decisions by automating the workplace of a transport engineer on the basis of the development and use of methods for selecting and calculating the number of vehicles for servicing remote objects. A specific example based on the transport service of electric power facilities, which can be implemented in any software of the organization, is considered

Keywords: Workplace automation, transport operation engineer, transport service, electric power facility, calculation of the number of vehicles.

An algorithm for determining the lower confidence limit (NDH) for the minimum value of the hardness of a set of machine parts by calculation is developed. For processing of statistical data of the hardness measurements used a three-parameter Weibull distribution is offered. The transition from sample data to population data is carried out by the graphical method. According to the algorithm, NDH was found for the minimum hardness value with confidence probabilities p=0.9; 0.92;0.93;0.94.

Keywords: hardness, machine parts, sampling, aggregate, lower confidence limit, graphic method, calculation method

As a result of analyzing various factors that reduce the level of professional working capacity of the driver of passenger vehicles, a method of pre-trip computer assessment of his professional readiness has been developed. The software for personal computers and mobile devices has been developed, which allows to carry out express diagnostics of the functional states of the driver, based on test tasks and mathematical analysis of the obtained values.

Keywords: passenger driver, express diagnostics, pre-trip performance, functional status, testing methodology

Тhe article provides a program of general and in-depth diagnosis for the entire fleet for the year for the motor company " Avtomobilist-3". The issues of expert diagnosis of car malfunction are touched upon.

Keywords: car, diagnostics, maintenance, diagnostic information, reduce downtime, database

A systematic analysis of the trends in the development of the electric transport industry has been carried out. Revealed a significant increase in sales of electric vehicles. On the basis of the analysis formed the advantages and disadvantages of its application. Particular attention is paid to the use of alternative energy sources.

Keywords: car, electric transport, environmental pollution, solar energy, energy, battery

The selective method of calculation because of the profitability is successfully applied several centuries. However when calculating non-failure operation in case of fatigue failures (often sudden) when there is a considerable sedate communication of m=10-15 for the supermulti-cycle field of loading between durability (hardness, an endurance limit) and the operating tension, decrease in the minimum resource of details will make 10-100 and more times. It turns out because of an unaccounted main part of population. In our example of 104-50=9950 pieces of such details, i.e. their potential refusals. Therefore for this case a selective method – the intermediate stage of calculations.

Keywords: selection, fatigue resource, population of final volume, sedate communication

The article discusses the features of motor vehicle leasing. The advantages and disadvantages of this form of increasing and updating the rolling stock of the enterprise are formulated. The analytical data of this market segment are given.

Keywords: car, vehicle, motor vehicle leasing, rolling stock renewal, improving the competitiveness of an enterprise, market

The article deals with the analysis of theoretical cycles of internal combustion engines. Presents Otto cycle, Diesel and Sabate-Trinkler. The theoretical cycle is a closed cycle occurring in the cylinders of the piston engine with its inherent features and assumptions. Each cycle is characterized by two main indicators, such as heat use and efficiency. In this case, the thermal utilization is determined by the thermal efficiency. The estimation of influence of thermodynamic factors on change of thermal efficiency for reception of the best efficiency and the maximum specific work of cycles is resulted. The thermal efficiency of the mixed cycle is obtained. The conclusions of the influence of the compression ratio on the thermal efficiency are presented. A comparison' of different theoretical cycles from the point of view of their cost-effectiveness and efficiency under the same conditions.

Keywords: internal combustion engine, ideal cycle, thermal efficiency, thermal processes

The compare the durability of the existing ball bearings (SHO) with the polymer homogeneous element with the durability of the modified supports, a cell model with the averaged placement of the modifier in SHO substrate and a model for bringing the multilayer sho body to the equivalent single-layer one are constructed; calculations of contact pressure, contact deformations and stresses are performed. The calculation takes into account the rheological and physico-chemical properties of the components of SHO substrate and modifier, the influence of the environment. As a result of calculations, it was found that at all points of the contour the material experiences a biaxial plane two-dimensional stress state, called pure shear with the presence of shear stresses. The most intense point of danger is the point lying in the center of the platform of contact of details.

Keywords: ball bearing, durability, modeling, polymer material, granule, modification

In the article the reasons of occurrence of uneven wear of brake pads are considered. The main types of the indicated malfunction are given. Recommendations for elimination in road conditions are given.

Keywords: car, brake system, brake shoe, wear pads, malfunction

The system analysis of the main directions of the fourth scientific and technological revolution, called "Industry 4.0" in the field of road transport, is conducted in the article. The essence of the industry 4.0 is the development of the digital economy using cyberphysical systems, the Internet of things and large data. Applicable to road transport can be identified three areas: the creation of an unmanned vehicle, the development of technological support for the movement of trucks in the convoy, the development and implementation of "automobile Internet". At the same time, there are a number of technological, legal and ethical problems that hamper the large-scale development of a new generation of transport.

Keywords: Industry 4.0, unmanned vehicle, Internet of Things, Cyberphysical systems, autonomous transport, cloud technologies

Тhe article deals with the malfunctions of the vehicle's brake system, resulting in uneven wear of the brake pads. Illustrations of damaged pads are given. Recommendations for troubleshooting are given.

Keywords: car, brake system, brake shoe, wear pads, malfunction

In the article questions of diagnosing of a technical condition of antiblocking system (ABS) of brakes of the car are considered. The main types of faults and the causes of their occurrence are outlined. Recommendations are given to drivers for the prevention of damages or failures of ABS

Keywords: car, anti-lock braking system, diagnostics, stand, malfunction, failure

The review of ways of welding of elements of bodies of cars is carried out. Merits and demerits of spot contact welding and a way of welding with use of the high-concentrated power sources are considered. The processes which are taking place in a zone of a welded seam when using laser welding are in details considered.

Keywords: metal welding, welded seam, laser welding

Researches of hardness of various steel grades for the purpose of determination of density of their distribution and distribution of extremes of selections are conducted. Results of the received researches are used for definition of a resource of details with use of a graphic method of transition from selection to set.

Keywords: selection, fatigue resource, population of final volume

The study on the hardness of samples from steel ST3 and 15G. On the basis of the correlation equations obtained values of ultimate strength of the examined steels. With the application of the law of three-parameter Weibull distribution constructed density distribution and the resulting minimum value of ultimate strength. The obtained results are proposed to use to determine the value of the resource for load-bearing systems of vehicles.

Keywords: reliability, lifetime, the hardness of steel, strength of steels, the endurance limit of steels, the Weibull law

In the article the distinctive features of the cargo car service are compared with the service servicing cars. Questions of an optimum term of carrying out of diagnostics of brake system of the lorry and qualification of the personnel of car-care center are raised. A comparative analysis of three types of stands for the diagnosis of the brake system of a car is carried out.

Keywords: Car, maintenance, diagnostics, car service, braking system, bench tests

The article raises the questions of expert diagnostics of autorefrigerators in the conditions of car-care center. A decision tree was built with a low oil pressure in the engine. Identified factors affecting the effective operation of the refrigeration unit.

Keywords: Specialized transport, car-refrigerator, maintenance, diagnostics, car service, decision tree

In the article the analysis of the market of services of a car-care center of an average city is carried out. A selection of popular car repair shops is given. The market is estimated by the number of required posts and the market share of the services in the city.

Keywords: Car, maintenance, repair, market of services of car-care center, working post