The analysis of previously performed studies to determine the fuel efficiency of automobile and tractor engines when a part of the cylinders is disconnected is carried out. This is done by stopping the fuel supply to them with simultaneous disconnection of the gas distribution mechanism for the same cylinders or without affecting the gas distribution organs in partial operating modes. It is shown that if the cylinder shut-off system for engines with forced ignition is used in serial engines, then additional research is required for diesels, since the results of experimental studies given in the literature are contradictory. The previously proposed methods are based on the use of experimental characteristics, empirical dependencies, and other experimental data that are valid only for specific diesels and their operating modes. In addition, the assessment of fuel efficiency is mainly performed by calculation without experimental confirmation. Therefore, the results of computational studies presented in some papers differ qualitatively from the results of experimental studies presented in other papers. A method based on generalized experimental data is proposed that allows the load characteristics of a full-size diesel engine to calculate its indicator and effective indicators when the fuel supply to some cylinders is stopped. The results of experimental and computational studies of changes in the fuel efficiency of a 4CH10,5/12 diesel engine in partial modes when a part of the cylinders is switched off are presented. At the same time, several options are considered - by stopping the fuel supply and closing the intake and exhaust valves, as well as without any impact on the organs of the gas distribution mechanism. It is shown that the improvement of the fuel economy of the 4CH10,5/12 diesel engine when a part of the cylinders is disconnected with the intake and exhaust valves closed is due to the absence of pump losses in the disconnected cylinders.

The article discusses the principles of operation of the catalytic neutralization system located in the exhaust path to the turbine of the diesel boost unit or gas engine. The important advantages of such a system are the high efficiency of reducing emissions of harmful substances in a wide range of loads and the possibility of using thermal energy of catalytic reactions in the operating cycle of a hybrid engine. Due to the increased neutralization efficiency, it is also possible to use catalytic reactors with a smaller core volume. The work on an experimental study of a new arrangement of the neutralization system was started in JSC “Scientific and Production Alliance “Turbotehnika”. The work is aimed at determining the possibility of regulating the power of the turbine using the heat flux of the neutralization system. To obtain the necessary thermal effect, it is proposed to use the supply of additional (secondary) fuel to the input of the catalytic converter. The oxidation of secondary fuel is provided by the presence of free oxygen in the exhaust gases of the engines during the combustion of lean mixtures. An additional regulation of the turbine power is designed to eliminate the known problems of a single-stage gas turbine pressurization, which is the lack of available exhaust energy in the low-speed region and the delay in the reaction to transient modes. The article presents the results of an experimental study of a prototype converter as part of an engine on a motor test bench. Confirmation of the possibility of additional control of the turbine was received. As a result of the research and testing, the features of the new design of the neutralization system, which provides for the combination of a converter with a turbocompressor in a single module, are identified. It is proposed to place a cellular toroidal catalytic unit in the cavity in front of the turbine coil.

The paper presents the analysis of systems for differentiated fertilization and the results of laboratory tests of subsurface fertilizer cultivator. The technology of the differentiated fertilizer application (DFA) is one of the priority areas in precision agriculture. The purpose of the research is to select the most effective DFA system for subsurface fertilizer cultivators applied in the northern regions of Kazakhstan and to test the design and technological scheme of pneumatic transport. The optimal system of differentiated application of fertilizers was chosen according to the generalized desirability function, the main difficulty was to create a sign that quantitatively determines the functioning of the object under study. To construct a multiple optimization parameter the idea of converting the natural values of specific object parameters into an unbounded scale was used. The obtained information on systems of differentiated fertilization was processed using standard methods of comparison, analysis, and synthesis. The results of laboratory tests were processed using methods of mathematical statistics. Based on the research results, according to the generalized desirability function the system «Agronavigator-Dozator» was chosen, which consists of a navigation system «Agronavigator Plus», GLONASS/GPS antenna, actuators, connecting cables and control panel for remote activation of the "Processing" mode. According to the laboratory tests, the functionality of the pneumatic transport system for mineral fertilizer granules and the dosing device was tested. The structural and technological scheme of pneumatic transport includes a fan driven by a hydraulic motor, airflow distributor, connecting pipelines and ejector funnels. It is established that in the range of fan revolutions from 2100 to 2700 rpm stable transportation of granules is provided without blockage of pipelines and ejector funnels, airflow speed in pipelines is provided in the range from 13 to 25 m/s. The deviation of the actual fertilizer dosage from the target was 2.1-5.0 %.

Intensive and industrial technologies are based on the effective use of chemicals. However, its capabilities are far from being fully utilized. The shortage of grain crops cultivated by intensive technologies was largely predetermined by the low level of organization of agrochemical work. A successful increase in the effectiveness of the use of all types of fertilizers and chemical plant protection products is possible only on the basis of an integrated quality management system for technological processes (IQMS TP), which includes interrelated organizational, technological and social activities. The technological process of using solid organic fertilizers is a set of technological operations for the preparation of fertilizers (composts), their loading, transportation and incorporation into the soil, i.e. complex system. The efficiency indicators for it are the uneven distribution of nutrients over the entire cultivated area and the dose of fertilizers. Given that the complete identification of the technological process is a complex task, in this paper authors restrict themselves to establishing functional relationships between indicators of the second, third, and fourth levels. The need to establish a connection between these levels is due, first of all, to the fact that the quality of the technological process of using fertilizers in a production environment is determined mainly by the operations of their preparation and application, which can be controlled and managed. To justify the technological tolerances for performing these operations, authors first established a functional relationship between indicators characterizing the quality of distribution of nutrients in the mass of fertilizers and the distribution of their physical mass throughout the field to be processed, and complex indicators of the quality of distribution of nutrients in the same field. According to the compost preparation operation, dependencies are established between such input indicators as the quality of the initial components (humidity, density, fractional composition), their ratio, and the output: humidity, density and fractional composition of the obtained fertilizer, quality of distribution of nutrients in the mass. As technological constants and parameters the dependence should also include the preparation time, energy consumption for preparation and other indicators. These data are necessary to optimize the preparation operation and the entire technological process.

The article describes a method for determining the maximum pressures in contact of an ultra-low pressure tire with deformable soil: with low bearing capacity using the example of a thin-walled tire 1020x420-18 of the Bel-79 model. In the current practice of determining the effect of pneumatic tires on the soil, the method of determining the contact area of a tire on an undeformable flat bearing surface is used. By dividing the load on the tire by the obtained contact area, multiplied by correction factors, the maximum tire pressure on the soil is obtained. By comparing the maximum pressure obtained in the tire contact with the non-deformable bearing surface with the permissible pressure, the correspondence of tractor and agricultural tires to operating conditions on soils with a certain moisture and hardness is evaluated. But this method of assessment is unacceptable for tires of low and ultra-low pressure due to significant deformation of the tire and soil: in contact and, therefore, a larger contact area and lower values of maximum and average pressure on the soil. Therefore, the novelty of the work is an experimental assessment of the impact on the soil of tires of low and ultra-low pressure on deformable soil. The method includes the experimental determination of the dependence of tire and ground deformations on air pressure in a tire and load, as well as the dependence of the contact area sizes on deformable soil on tire and ground deformations. The contact areas and the coefficients of the uneven distribution of pressure in the contact according to the average values and shapes of the diagrams determine the maximum pressure in the contact of the tire with deformable soil. As a result, the curves of the dependences of maximum pressures in contact on air pressures and loads on deformable soil for low and ultra-low pressure tires were obtained for the first time. The dependences of maximum pressures in contact on air pressure at fixed loads can be a kind of passport for thin-walled tires, similar to the traction characteristics of tractor tires and the traction and speed characteristics of automobile tires. The results obtained make it possible to determine with high accuracy the operating conditions of high-traffic vehicles on low and ultra-low pressure tires.