System changeable phases of gas distribution of the internal combustion engine

2015 ◽  
Vol 3 (5) ◽  
pp. 70-73
Author(s):  
A. Popov ◽  
Vasiliy Kapustin ◽  
V. Steklenev
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Gas Distribution

scholarly journals GAS DISTRIBUTION PHASES HYDRAULIC CONTROLLED INTERNAL COMBUSTION ENGINE VALVES

2022 ◽  
Vol 16 (4) ◽  
pp. 47-52
Author(s):  
Nail Adigamov ◽  
Andrey Negovora ◽  
Larisa Zimina ◽  
Alexey Maximov
Keyword(s):  
Internal Combustion Engine ◽  
High Speed ◽  
Combustion Engine ◽  
Hydraulic Drive ◽  
Internal Combustion ◽  
Valve Timing ◽  
Gas Distribution ◽  
Time Section ◽  
Engine Valves ◽  
Opening And Closing

The efficiency of an agricultural car or tractor depends on the characteristics of the engine determined by the gas distribution mechanism (GRM). Traditional timing with fixed valve timing does not provide high-quality gas exchange at all engine operating modes. The aim of the work is to improve the characteristics of the engine by using the hydraulic drive of the timing valves. The drive allows you to turn off individual valves, set the moments of their opening and closing in an arbitrary way, provide several triggering of the internal combustion engine valves during the operating cycle. The drive is controlled by an electronic control unit (ECU). The advantage of the drive is its ease of integration into the internal combustion engine. The hydraulic drive ensures that the timing valves are lifted to a height of about 14 mm. The law of displacement of the valve, revealed experimentally, is close to trapezoidal. The use of a hydraulic valve drive has a positive effect on the "time-section" factor in the area of low and medium crankshaft rotational speeds. The increment of the factor "time-section" is due to the significant speeds of opening and closing the valves. Due to the peculiarities of the kinematic characteristics of the movement of the valves when using a hydraulic drive for their movement, the use of serial phases of gas distribution of the engine is impractical. Numerical modeling of the operation of the internal combustion engine determined the regularity of the change in valve timing from the high-speed operating mode of the engine. Optimization criterion is the achievement of maximum engine power. When choosing the valve timing, the possibility of meeting the intake and exhaust valves with the engine piston was excluded. The use of optimal phases leads to an increase in power up to 4.5% at a low crankshaft speed. With an increase in the speed mode, the increase in power decreases, and with a high frequency of rotation of the crankshaft, its slight decrease (1.4%) is observed. An increase in torque, up to a power utilization factor of 0.9, and its subsequent decrease, allow stabilizing the vehicle speed on a road with variable resistance. An increase in the working pressure in the hydraulic drive of the valves makes it possible to intensify gas exchange even at a high speed of rotation of the crankshaft

Research and Analysis of the CDV Internal-Combustion Engine Gas Distribution Phase in the Low Temperature Start Process

2014 ◽  
Vol 889-890 ◽  
pp. 474-478
Author(s):  
Lei Ming Shi ◽  
Li Ge Mei ◽  
Zhi Hong Wang ◽  
Yi Ming Shao
Keyword(s):  
Low Temperature ◽  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Exhaust Emission ◽  
Intake Valve ◽  
Gas Distribution ◽  
Angle Change ◽  
Distribution Phase ◽  
Start Process

With the help of CDV internal-combustion engine start process test in the low temperature, it was investigated and analysed for the effects of the intake advance angle of gas distribution phase in the low temperature start and its exhaust-emission performance of internal-combustion engine. In the process of test ,the intake-advance angle change was from 1 °- 11 °and the valve overlap angle change was from 38 ° - 48 °. The internal-combustion engine was started according to the test number of the requirements. It was observed and calculated for starting conditions and exhaust emission with PC. The results show that the appropriate delay of intake valve open timing, and hence the change of valve timing overlap of the intake valve and exhaust valve, and the proper decrease of in-cylinder fresh intake gas, not only significantly improve the performance of internal combustion engine low temperature start combustion work, shortening start duration, but also help to reduce the quantities of HC and CO emissions during the low temperature start process.

scholarly journals Investigation of the Fluid Dynamics of Lubrication in the Gaps of the Gas Distribution Mechanism of the Internal Combustion Engine

2021 ◽  
pp. 34-39
Author(s):  
Alexander Vasilyev ◽  
◽  
Evgenij Ageev ◽  
Keyword(s):  
Fluid Dynamics ◽  
Mathematical Model ◽  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Accurate Determination ◽  
Internal Combustion ◽  
Exhaust Valve ◽  
Gas Distribution ◽  
Engine Exhaust

The method of calculating the fluid dynamics of the lubricant in the gaps is considered on the basis of a generalized mathematical model of the dynamics of the gas distribution mechanism. The results of its use for the drive of the engine exhaust valve are presented. It is shown that the developed methods and algorithms provide a more accurate determination of the dynamic and tribological characteristics of the gas distribution mechanism.

scholarly journals MODELING OF THE PROCESS OF ELECTROMECHANICAL CONTROL OF GAS DISTRIBUTION OF AN ELECTRIC ENERGY GENERATOR WITH AN INTERNAL COMBUSTION ENGINE

2021 ◽  
pp. 51-58
Author(s):  
S. Zaichenko ◽  
S. Korol ◽  
V. Opryshko ◽  
D. Derevyanko ◽  
N. Zhukova
Keyword(s):  
Internal Combustion Engine ◽  
Engine Speed ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Optimal Operation ◽  
Intake Manifold ◽  
Exhaust Pipe ◽  
Gas Distribution ◽  
Exhaust Gases ◽  
Opening And Closing

The use of generators at different load levels allows you to use part of the rated power of the engines, by reducing the speed of the internal combustion engine, thus reducing fuel consumption and increase the overall efficiency of the system as a whole. However, it should be noted that the optimal operation of the internal combustion engine at fixed gas distribution parameters is possible only at a certain engine speed. Reducing the engine speed leads to a deterioration of the filling of the fuel-air mixture and the release of exhaust gases from the engine, accompanied by the intake of exhaust gases into the intake manifold and the emission of part of the fuel mixture into the exhaust pipe. The paper presents the results of the study of generator parameters and the general concept of creating an autonomous power supply control system based on an internal combustion engine in order to reduce the specific indicators of electricity generation. The expediency of regulating the power level of an internal combustion engine has been experimentally proved. To achieve this goal, it is proposed to adjust the opening and closing angles of the internal combustion engine with a solenoid valve. The use of this system allows to reduce the specific costs by more than 4 times when generating electricity with low generator load. Based on the phase distribution diagram of the internal combustion engine, the dependence of the change of the opening and closing angles of the inlet and outlet valves on the power of the autonomous energy source is proposed.

АКУСТИЧНА ПОМІТНІСТЬ БЕЗПІЛОТНИХ ЛІТАЛЬНИХ АПАРАТІВ З СИЛОВИМИ УСТАНОВКАМИ НА БАЗІ ПОРШНЕВИХ ДВИГУНІВ

2020 ◽  
pp. 62-80
Author(s):  
В. В. Руденко ◽  
И. В. Калужинов ◽  
Н. А. Андрущенко
Keyword(s):  
Control System ◽  
Internal Combustion Engine ◽  
Power Plants ◽  
Combustion Engine ◽  
Spectral Characteristics ◽  
Experimental Studies ◽  
Internal Combustion ◽  
Detection Range ◽  
Acoustic Signature ◽  
Static Conditions

The presence in operation of many prototypes of UAVs with propeller propellers, the use of such devices at relatively low altitudes and flight speeds makes the problem of noise reduction from UAVs urgent both from the point of view of acoustic imperceptibility and ecology.The aim of the work is to determine a set of methods that help to reduce the visibility of UAVs in the acoustic range. It is shown that the main source of noise from the UAV on the ground is the power plant, which includes the engine and the propeller. The parameters of the power plants influencing the processes that determine the acoustic signature of the UAV were investigated. A comprehensive analysis of the factors affecting visibility was carried out. The power plants include two-stroke and four-stroke engines, internal combustion and two-blade propellers. The use of silencers on the exhaust of the internal combustion engine was considered. The spectral characteristics of the acoustic fields of the propeller-driven power plants for the operating sample of the UAV "Eco" were obtained. The measurements were carried out in one-third octave and 1/48 octave frequency bands under static conditions. The venue is the KhAI airfield. Note that the propellers that were part of the power plants operated at Reynolds numbers (Re0,75<2*105), which can significantly affect its aerodynamic and acoustic characteristics. It is shown that when choosing a UAV control system, one should take into account the fact that two-stroke piston engines are the dominant source in the noise of propeller-driven control systems in the absence of a hood and mufflers in the intake and exhaust tracts. The use of a four-stroke internal combustion engine significantly reduces the noise of the control system. In the general case, the position of the boundaries of the zone of acoustic visibility of a UAV at the location of the observer is determined by the ratio between the intensity of acoustic radiation perceived by the observer from the UAV and the intensity of sound corresponding to the natural acoustic background and depends on the degree of manifestation of acoustic effects accompanying the propagation of sound in a turbulent atmosphere - the refraction of sound waves. Absorption and dissipation of acoustic energy. The calculation and comparison of the UAV detection range was carried out taking into account the existing natural maskers.The results of experimental studies are presented that allow assessing the degree of acoustic signature of the UAV. A set of measures aimed at reducing the intensity of the acoustic signature of the UAV in various regions of the radiation spectrum has been determined.

CONVERTING THE VEHICLE BY REPLACING THE INTERNAL COMBUSTION ENGINE

2019 ◽  
pp. 29-35
Author(s):  
Oleksandr Gryshchuk ◽  
Volodymyr Hladchenko ◽  
Uriy Overchenko
Keyword(s):  
Internal Combustion Engine ◽  
Electric Vehicle ◽  
Electric Motor ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Environmental Safety ◽  
Environmental Conservation ◽  
Sales Forecasts ◽  
Financial Investments ◽  
Near Future

This article looks at some comparative statistics on the development and use of electric vehicles (hereinafter referred to as EM) as an example of sales and future sales forecasts for EM in countries that focus on environmental conservation. Examples of financial investments already underway and to be made in the near future by the largest automakers in the development and distribution of EM in the world are given. Steps are taken to improve the environmental situation in countries (for example, the prohibition of entry into the city center), the scientific and applied problem of improving the energy efficiency and environmental safety of the operation of wheeled vehicles (hereinafter referred to as the CTE). The basic and more widespread schemes of conversion of the internal combustion engine car (hereinafter -ICE) to the electric motor car (by replacing the gasoline or diesel electric motor), as well as the main requirements that must be observed for the safe use and operation of the electric vehicle. The problem is solved by justifying the feasibility of re-equipment of the KTZ by replacing the internal combustion engine with an electric motor. On the basis of the statistics collected by the State Automobile Transit Research Institute on the number of issued conclusions of scientific and technical expertise regarding the approval of the possibility of conversion of a car with an internal combustion engine (gasoline or diesel) to a car with an electric motor (electric vehicle), the conclusions on the feasibility of such conclusion were made. Keywords: electricvehicles, ecological safety, electricmotor, statistics provided, car, vehicle by replacing.

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