Vol 7, No 1-1 (2013)

The article examines the structural alterations in various systems of internal combustion engines with spark ignition, which are required when switching engine to gasoline-ethanol fuel with different concentrations of ethanol.

The article considers the application of laser light sources in exhaust gas mixture analyzers of automotive internal combustion engines. The authors show functional diagram of the installation where it is possible to carry out experiments on testing and selection of lasers for use in analyzers of gases contaminated by impurities. The possibility of using the coordinate photodetectors of FDK-124 type in analyzers of gas, polluted by microparticles, is presented as well.

The authors consider issues of kinematics and mechanics of rolling of elastic wheel set with various camber and toe angles.

In the paper the authors study the problem of turbine blades design. For computer-aided design in Mathcad the application program was developed as an element of the CAD system. A blade is shaped by three parabolas: back side– by one parabola, and pressure side – by two parabolas prescribing the maximum thickness of the profile. The program was tested on more than 30 profiles of blades for gas turbine engines.

The paper presents theoretical study of possible ways of torque generating in hybrid and combined powerplants with possible changes of efficiency and environmental indicators.

The way of the formation of diesel engine load curves by means of shutdown of operating cycles is considered in the paper. The authors give the corresponding relations of the internal combustion engine theory and dependence plot of the number of working cylinders and the total number of engine cylinders.

The article provides a rationale method for stabilizing thermal stress in tires of vehicles track rollers by choosing the angle of suspension unit setting.

The authors consider the problems of creation and operation of human oriented control systems that use contactless gestural interfaces. There is an analysis of existing approaches done and assumptions about the most effective approaches to the construction of such systems.

In the paper the authors put forward the concept of increasing active safety of vehicles by controlling the air pressure in the tires of cars. The authors consider that the control of the air pressure in the tires is necessary because it directly affects the performance in handling and stability, especially automobiles.

The article presents a method of calculation that is proposed for use when selecting the main elements hydrostatic transmission of drive wheels self-propelled machines.

The article describes an estimated model of a vehicle powerplant. This model takes into account the fluctuations of the power unit along and around the three axes and considers the impact of the transmission to the whole picture of the oscillations of the power unit. The mathematical description of the computational model of the power unit is presented on the example of a small class car.

This article provides an overview of modern construction materials for production of pistons for internal combustion engines including composites. A comparison of mechanical and thermal properties of these materials is presented. It is reported on the experience of production of pistons made from carbon composite in Russia.

The authors offer the technique of forced life testing of tractor friction clutches imitating their mode of loading in actual operation. The forcing of endurance bench-testing of friction clutches according to the proposed method compared to the common performance is increased by 6 ... 10 times depending on the design of friction pairs, materials and conditions of loading operation.

The authors offer a method of segmentation of the market for agricultural tractors according to their pulling force and power, allowing more effectively analyze and predict the market comparing to conventional methods of segmentation according to engine power of a tractor.

Nonuniform distribution of velocity of cooling air over the front surface of a radiator increases its drag. The paper analyzes the factors affecting the increase of aerodynamic drag under the influence of unsteady air flow. The degree of drag change depends on aerodynamic properties of radiator core, namely, the curvature of the graph of aerodynamic characteristics of a radiator and nonuniform air velocity field over the front of a radiator. In actual use, increase of drag of a radiator can be more than 20%.

The paper provides a description of the simulation management system for control of manufacturing process of electromechanical transducers, designed for stabilizing the reliability of production.

The authors consider the relationship between kinematic parameters and energy properties of rolling wheel propulsor. The authors solve the problem of the existence of solutions for three-dimensional system "rolling wheel propulsor - bearing surface" when forming a bearing surface. The research also establishes the relationship between the speed of motion of the system and the nature of vibrations affecting ride comfort of a vehicle.

The article describes schematic diagrams of devices used to record microprofiles of automobile roads, their advantages and disadvantages. The authors propose construction diagram, free from most of the disadvantages.

The strategy of improving the environmental quality of engines using hydrogen synthesis gas as means of chemical activation of workflow is discussed in the paper. The technologies for generating synthesis gas aboard a vehicle are also considered. The authors present the description of the experimental onboard system for producing hydrogen synthesis gas by thermochemical conversion of gasoline. The article contains the materials of its testing on a real car.

The article considers the simulation of random microprofile of road surface by the method of shaping filter. Differential equations of the shaping filter for different correlation functions are obtained.

The article describes the basic principles for integrating power supply system in a multiplex system of a vehicle. Currently, the stage of integrated systems with saturation function in every particular system transforms to the stage of the information technology with integration of different “intelligent” systems in the information environment of a vehicle. Combined sharing of information from sensors creates prerequisites to the distribution of intelligence in the various systems of electrical equipment, in other words, the ability of systems to make decisions on corresponding hierarchical level.

The authors present the experimental results proving that in the real exploitation of a vehicle or a tractor self-exciting oscillations do not occur in friction pairs of friction clutch. This refers to friction clutches with asbestos, asbestos-free polymer and sintered powder friction pads.

Electrohydraulic devices are widely applied for control of transmission frictional mechanisms containing multi-plate wet clutches or brakes. Depending on function and conditions of engaging there are devices of relay or proportional operation. The last one use electromagnets of proportional action where attractive force between rotor and stator depends only on current magnitude in a winding. Such devices can be direct action devices or servo-action ones.