A Novel Air Cycling Valve for Combustion Engines

2011 ◽  
Author(s):  
Steffen Braune ◽  
Klaus-Dietrich Kramer
Keyword(s):  
Control Algorithm ◽  
Engine Speed ◽  
Single Phase ◽  
Combustion Engine ◽  
Design Procedure ◽  
Combustion Engines ◽  
Torque Density ◽  
Reduction Of Co2 ◽  
Inlet Manifold ◽  
Lower Engine Speed

This paper describes a novel actuator used as a drive system for an air cycling valve (ACV) for combustion engines. With this actuator concept, which is based on a single-phase synchronous motor, a small construction volume, a high torque density, combined with low power consumption and a robust construction is realized. The ACV enables a torque advance for the combustion engine for lower engine speed and an improvement of fuel economy, associated with a reduction of CO2. It is installed into the inlet manifold with no modification of the cylinder head. Extremely high angular accelerations with high velocities are realized to switch the flap of the air cycling valve in less then two milliseconds with a rotation angle of 45 degree. Described is the design procedure and used control algorithm.

scholarly journals INFLUENCIA DE LAS MEZCLAS DIESEL BIODIESEL EN EL COMPORTAMIENTO DE LOS PARÁMETROS EFECTIVOS Y MEDIOAMBIENTALES DE UN MOTOR DE COMBUSTIÓN INTERNA DIESEL DE 6,11 KW

2018 ◽  
Vol 27 (1) ◽  
pp. 15
Author(s):  
Antonio Mejía R. ◽  
Luis Lastra E.
Keyword(s):  
Engine Speed ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Effective Parameters ◽  
Palabras Clave ◽  
Load Characteristics ◽  
Testing Bench ◽  
Calorific Power ◽  
Made In

Este trabajo de investigación se realizó en el Instituto de Motores de Combustión Interna de la Facultad de Ingeniería Mecánica de la Universidad Nacional de Ingeniería en la ciudad de Lima, con la finalidad de evaluar la influencia de las mezclas Diésel biodiesel B10, B20 y B30 en el comportamiento de los parámetros efectivos y medioambientales de un motor de combustión interna Diésel de 6,11 kW. Los resultados obtenidos con las mezclas Diésel biodiesel y el combustible comercial B5, luego de las mediciones realizadas en el motor, permiten obtener y graficar las características de velocidad y las características de carga del motor utilizado en la investigación, mostrando la variación de los parámetros efectivos y de opacidad, de esta manera permite contrastar las hipótesis establecidas y presentar las respectivas conclusiones. Palabras clave.- Biodiesel, banco de pruebas, poder calorífico, viscosidad, índice de cetano, parámetros efectivos, motor de combustión interna, características de velocidad, características de carga. ABSTRACT This research was conducted at Combustion Engines Institute of the Mechanic Engineering Faculty in National Engineering University of Lima. The aim of this research is to evaluate the influence of Diesel blends biodiesel B10, B20 and B30 in the effective and environmental operating parameters of internal combustion Diesel engine 6.11 kW. The results obtained with the Diesel biodiesel blends and the B5 commercial fuel, after the measurements made in the engine, let us obtain and graph the characteristics of speed and load of the engine used in this research, showing a variation in the effective and opacity parameters so, the hypothesis given can be contrasted and the conclusions can be presented. Keywords.- Biodiesel, testing bench, calorific power, viscosity, cetane index, effective parameters, internal combustion engine, speed characteristics, load characteristics.

Effect of Chemical Hythane Composition on Pressure in Combustion Chamber of Engine

2019 ◽  
pp. 36-42
Author(s):  
A. P. Shaikin ◽  
I. R. Galiev
Keyword(s):  
Natural Gas ◽  
Combustion Chamber ◽  
Power Plants ◽  
Engine Speed ◽  
Combustion Engine ◽  
Fuel Mixture ◽  
Maximum Pressure ◽  
Chamber Volume ◽  
Excess Air ◽  
Scientific Papers

The article analyzes the influence of chemical composition of hythane (a mixture of natural gas with hydrogen) on pressure in an engine combustion chamber. A review of the literature has showed the relevance of using hythane in transport energy industry, and also revealed a number of scientific papers devoted to studying the effect of hythane on environmental and traction-dynamic characteristics of the engine. We have studied a single-cylinder spark-ignited internal combustion engine. In the experiments, the varying factors are: engine speed (600 and 900 min-1), excess air ratio and hydrogen concentration in natural gas which are 29, 47 and 58% (volume).The article shows that at idling engine speed maximum pressure in combustion chamber depends on excess air ratio and proportion hydrogen in the air-fuel mixture – the poorer air-fuel mixture and greater addition of hydrogen is, the more intense pressure increases. The positive effect of hydrogen on pressure is explained by the fact that addition of hydrogen contributes to increase in heat of combustion fuel and rate propagation of the flame. As a result, during combustion, more heat is released, and the fuel itself burns in a smaller volume. Thus, the addition of hydrogen can ensure stable combustion of a lean air-fuel mixture without loss of engine power. Moreover, the article shows that, despite the change in engine speed, addition of hydrogen, excess air ratio, type of fuel (natural gas and gasoline), there is a power-law dependence of the maximum pressure in engine cylinder on combustion chamber volume. Processing and analysis of the results of the foreign and domestic researchers have showed that patterns we discovered are applicable to engines of different designs, operating at different speeds and using different hydrocarbon fuels. The results research presented allow us to reduce the time and material costs when creating new power plants using hythane and meeting modern requirements for power, economy and toxicity.

The Use of Short-Term Compressed Air Supercharging in a Combustion Engine with Spark Ignition

2021 ◽  
Vol 18 (2) ◽  
pp. 8704-8713
Author(s):  
Jarosław Janusz Mamala ◽  
K. Praznowski ◽  
S. Kołodziej ◽  
G. Ligus
Keyword(s):  
Driving Force ◽  
Negative Impact ◽  
Combustion Engine ◽  
Spark Ignition ◽  
Compressed Air ◽  
Acceleration Process ◽  
Combustion Engines ◽  
Short Term ◽  
Drive Unit ◽  
The People

The powertrain is a very important subassembly in a car and is responsible not only for the automotive industry’s impact on the environment but also for the safety of people travelling by car and performing overtaking manoeuvres and joining traffic. In general, the powertrain is a combination of the drive unit and drive transmission, wherein the drive unit is responsible for the available driving force in the car’s wheels and for the car’s ability to accelerate when the throttle pedal is rapidly pressed at a constant gearbox ratio. The availability of the driving force reserve in the powertrain is the most important issue for the reason of safety of the people travelling by car. In the case of drive unit what they are of the combustion engines, the rapid pressing of the throttle pedal in the car acceleration process leads to a temporary deficiency in the driving force and in the powertrain’s output. The deficiency in the driving force has a negative impact on acceleration and driving comfort. In this paper, the authors assessed and analysed two different short-term compressed air supercharging systems for combustion engines with air supplied from a high-pressure tank. The analysis covered the response of the combustion engine with spark ignition to the gradual increase in pressure in the air-intake system. The assumption is that the applied short-term compressed air supercharging system could improve the driving force during the phase of the engine’s increasing crankshaft rotational speed. This helps to achieve the improved passenger car acceleration dynamics, depending on the supercharging method and throttle pedal exertion. When analysing the car’s acceleration dynamics, expressed by the shorter time of increasing the longitudinal speed from initial to final, it was possible to shorten the acceleration time. It is also possible to observe an improved driving force behaviour, especially during the first phase of acceleration.

Investigating Fuel Condensation Processes in Low Temperature Combustion Engines

2014 ◽  
Author(s):  
Lu Qiu ◽  
Rolf D. Reitz
Keyword(s):  
Low Temperature ◽  
Combustion Engine ◽  
Phase Region ◽  
Low Temperature Combustion ◽  
Combustion Engines ◽  
Two Phase ◽  
Temperature Combustion ◽  
Real Gas Effects ◽  
Unburned Hydrocarbons ◽  
Late Stages

Condensation of gaseous fuel is investigated in a low temperature combustion engine fueled with double direct-injected diesel and premixed gasoline at two load conditions. Possible condensation is examined by considering real gas effects with the Peng-Robinson equation of state and assuming thermodynamic equilibrium of the two fuels. The simulations show that three representative condensation events are observed. The first two condensations are found in the spray some time after the two direct injections, when the evaporative cooling reduces the local temperature until phase separation occurs. The third condensation event occurs during the late stages of the expansion stroke, during which the continuous expansion sends the local fluid into the two-phase region again. Condensation was not found to greatly affect global parameters, such as the average cylinder pressure and temperature mainly because, before the main combustion event, the condensed phase was converted back to the vapor phase due to compression and/or first stage heat release. However, condensed fuel is shown to affect the emission predictions, including engine-out particulate matter and unburned hydrocarbons.

scholarly journals THE COMBUSTION ENGINE INTAKE MANIFOLD CFD MODELING DEPENDING ON THE AIRBOX CONFIGURATION

2021 ◽  
Vol 2021 (6) ◽  
pp. 5421-5425
Author(s):  
MICHAL RICHTAR ◽  
◽  
PETRA MUCKOVA ◽  
JAN FAMFULIK ◽  
JAKUB SMIRAUS ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Combustion Chamber ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Stationary Flow ◽  
Cfd Modeling ◽  
Intake Manifold ◽  
Combustion Engines ◽  
Computational Fluid Dynamics Cfd

The aim of the article is to present the possibilities of application of computational fluid dynamics (CFD) to modelling of air flow in combustion engine intake manifold depending on airbox configuration. The non-stationary flow occurs in internal combustion engines. This is a specific type of flow characterized by the fact that the variables depend not only on the position but also on the time. The intake manifold dimension and geometry strongly effects intake air amount. The basic target goal is to investigate how the intake trumpet position in the airbox impacts the filling of the combustion chamber. Furthermore, the effect of different distances between the trumpet neck and the airbox wall in this paper will be compared.

scholarly journals Development of single phase 12S-6P FEFSM and field-oriented control algorithm based on the effect of rotor position on stator flux pair linkage

2020 ◽  
Vol 14 (8) ◽  
pp. 1458-1468
Author(s):  
Faisal Amin ◽  
Erwan Bin Sulaiman ◽  
Wahyu Mulyo Utomo ◽  
Mohd Fairoz Bin Omar ◽  
Faisal Khan
Keyword(s):  
Control Algorithm ◽  
Single Phase ◽  
Field Oriented Control ◽  
Rotor Position ◽  
Stator Flux

scholarly journals Fault analysis of the combustion engine used in public transport vehicles

2018 ◽  
Vol 189 (3) ◽  
pp. 95-108
Author(s):  
Pawel Drozdziel ◽  
Iwona Rybicka ◽  
Slawomir Tarkowski
Keyword(s):  
Public Transport ◽  
Combustion Engine ◽  
Fault Analysis ◽  
Annual Number ◽  
Repair System ◽  
Combustion Engines ◽  
Independent Factor ◽  
Dependent Variables ◽  
Made In

The goal of this article is the fault analysis of combustion engines on the basis of the assessment of dependent variables: initial mileage, annual mileage and the annual number of orders made in the service and repair system compared with the independent factor, i.e. bus make. In the research four vehicle makes were tested: Jelcz M121, Mercedes-Benz Citaro, Solaris Urbino 12 and Autosan Sancity 12LF. The research encompassed the number of faults of a vehicle and its systems, the initial and annual mileage. It was conducted on the basis of 2015 data broken into particular months.

scholarly journals Assessment of thermodynamic cycle of internal combustion engine in terms of rightsizing

2019 ◽  
Vol 178 (3) ◽  
pp. 182-186
Author(s):  
Zbigniew SROKA ◽  
Maciej DWORACZYŃSKI
Keyword(s):  
Internal Combustion Engine ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Combustion Process ◽  
Thermodynamic Cycle ◽  
Internal Combustion ◽  
Research Problem ◽  
Combustion Engines ◽  
Operating Characteristics ◽  
Swept Volume

The modification of the downsizing trend of internal combustion engines towards rightsizing is a new challenge for constructors. The change in the displacement volume of internal combustion engines accompanying the rightsizing idea may in fact mean a reduction or increase of the defining swept volume change factors and thus may affect the change in the operating characteristics as a result of changes in combustion process parameters - a research problem described in this publication. Incidents of changes in the displacement volume were considered along with the change of the compression space and at the change of the geometric degree of compression. The new form of the mathematical dependence describing the efficiency of the thermodynamic cycle makes it possible to evaluate the opera-tion indicators of the internal combustion engine along with the implementation of the rightsizing idea. The work demonstrated the in-variance of cycle efficiency with different forms of rightsizing.

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