THE EFFECT OF SOLID DEPOSIT FORMATIONS ON SI PFI ENGINE PERFORMANCE AND CONTROL

2014 ◽  
Author(s):  
Henry John Schmidt
Keyword(s):  
Engine Performance ◽  
Solid Deposit ◽  
And Control

A New Single-Zone Multi-Stage Scavenging Model for Real-Time Emissions Control in Two-Stroke Engines

2019 ◽  
Author(s):  
Abdullah U. Bajwa ◽  
Mark Patterson ◽  
Taylor Linker ◽  
Timothy J. Jacobs
Keyword(s):  
Gas Exchange ◽  
Internal Combustion Engines ◽  
Engine Performance ◽  
Combustion Engines ◽  
Thermodynamic State ◽  
Multi Stage ◽  
Exchange Processes ◽  
Proposed Model ◽  
Perfect Mixing ◽  
And Control

Abstract Gas exchange processes in two-stroke internal combustion engines, i.e. scavenging, remove exhaust gases from the combustion chamber and prepare the fuel-oxidizer mixture that undergoes combustion. A non-negligible fraction of the mixture trapped in the cylinder at the conclusion of scavenging is composed of residual gases from the previous cycle. This can cause significant changes to the combustion characteristics of the mixture by changing its composition and temperature, i.e. its thermodynamic state. Thus, it is vital to have accurate knowledge of the thermodynamic state of the post-scavenging mixture to be able to reliably predict and control engine performance, efficiency and emissions. Several simple-scavenging models can be found in the literature that — based on a variety of idealized interaction modes between incoming and cylinder gases — calculate the state of the trapped mixture. In this study, boundary conditions extracted from a validated 1-D predictive model of a single-cylinder two-stroke engine are used to gauge the performance of four simple scavenging models. It is discovered that the assumption of thermal homogeneity of the incoming and exiting gases is a major source of inaccuracy. A new non-isothermal multi-stage single-zone scavenging model is thus, proposed to address some of the shortcomings of the four models. The proposed model assumes that gas-exchange in cross-scavenged two-stroke engines takes place in three stages; an isentropic blowdown stage, followed by perfect-displacement and perfect-mixing stages. Significant improvements in the trapped mixture state estimates were observed as a result.

A Study on Speed Control System Based on STC89C51

2015 ◽  
Vol 713-715 ◽  
pp. 723-725 ◽  
Author(s):  
Jun Hai Jiang ◽  
Ming Hui Liu
Keyword(s):  
Control System ◽  
Engine Performance ◽  
Sensor Data ◽  
Digital Measurement ◽  
Motor Speed ◽  
Actual Measurement ◽  
Measurement And Control System ◽  
And Control ◽  
Measurement And Control ◽  
Made In

Introduces a STC89C51 microcontroller core with the speed of measurement and control system, the system can control the motor starts and stops, either manually or automatically adjust the duty cycle to control the motor speed is set by the Hall sensor data, for motor speed is measured to calculate and display the current motor speed in real time on the LCD. The system is made in the actual measurement with good results, as the research engine performance provides an important reference, so that the entire digital measurement speed system can be widely used, there is a strong practicality.

scholarly journals PRODUKSI GAS METANA DARI PENGOLAHAN SAMPAH PERKOTAAN DENGAN SISTEM SEL

2016 ◽  
Vol 11 (3) ◽  
pp. 389 ◽  
Author(s):  
Arie Herlambang ◽  
Henky Sutanto ◽  
Kusno Wibowo
Keyword(s):  
Sewage Treatment ◽  
Engine Performance ◽  
Developed Countries ◽  
Cell System ◽  
Waste To Energy ◽  
Water Control ◽  
Pipe System ◽  
Low Protein ◽  
And Control ◽  
Technology Solution

Waste to energy now become one of the technology solution that is in many developed  countries, in an effort to reduce greenhouse gas emissions from waste. Urban organic waste is a potential source of greenhouse gases. Methane gas is an energy source that can be used as fuel. It is difficult to find land for Landfill alocation in the major cities and often becomes a difficult social problem. Structured Landfill Cell is used to treat the waste at the landfill, with the aim to use land more scalable, easier waste management and control, better sanitation, better water control leachate and gas produced can bemanaged optimally and compost can be utilized with the production and quality control.This new system was first used in Indonesia by PT Navigats Organics Energy Indonesia in landfill Suwung, Denpasar, Bali. There are 5 cells already built in Suwung and two of cells have been filled with garbage. Each cell contains 12,000 m3 soliswaste. Observations carried out on gas productivity of two cells that have been filled, with a dry treatment on cell 1 (dry cell) and a wet treatment in cell 2 (wet cell). The observed gas is CH4, CO2,and O2 as the main parameters, with the addition parameters are CO and H2S. The instrument used is the GA 2000 Plus. Observations of two cells made for 4 months, with the content of CH4 around 40 to 50% in the first month and gradually decreased to reach 18 to 25% in the fourth month. Carbondioxyde going up and down following condition of CH4 and its value ranges between 16 and 28%. Oxygen consentration around 2 to 14%.For keeping engine performance the consentration of methane should more than 28%and O2 content lower than 6%. Cell with watering will temporarily reduce CH4 and CO2 and O2 increase, but it is slowly rising again. Carbonmonoside values tend to increase with age garbage (10 sd 350 ppm), whereas irregular H2S values ranging 0 up to 24 ppm, allegedly associated with the low protein content in the trash. Sewage treatment system is proven to increase CH4 gas, yet still needed modifications of structure and the gas collector pipe system so that productivity can be improved.Key Words : Solidwaste, Metana, Cell System

Calcium Naphthenate Solid Deposit Identification and Control in Offshore Nigerian Fields

2013 ◽  
Author(s):  
Lukman Oduola ◽  
Clement Uchechukwuka Igwebueze ◽  
Oluwaseun Smith ◽  
Peiter Vijn ◽  
Andrew G Shepherd
Keyword(s):  
Solid Deposit ◽  
And Control

Modeling and control schedule design of a two-dimensional thrust-vectoring nozzle and aeroengine

2020 ◽  
pp. 1-37
Author(s):  
Y. Liu ◽  
M. Chen ◽  
H. Tang
Keyword(s):  
Engine Performance ◽  
Inlet Temperature ◽  
Two Dimensional ◽  
Thrust Vectoring ◽  
Modeling And Control ◽  
Surge Margin ◽  
Schedule Design ◽  
Matching Mechanism ◽  
And Control ◽  
Cooling Air

Abstract For advanced operational aircraft, the two-dimensional (2-D) thrust-vectoring (TV) nozzle effectively improves the flight mobility and post-stall manoevrability. However, its flow capacity decreases when deflecting and cooling air is injected, which impacts the engine’s operating state, including decreasing the fan surge margin and increasing the turbine inlet temperature. Therefore, in order to improve engine performance in the whole flight envelope, this paper studies the matching mechanism of the engine and the cooled 2-D TV nozzle, performance characterisation and control schedule of the nozzle, and an integrated aeroengine/nozzle modeling method is put forward. Based on these, an engine performance simulation model is modified to include a cooled 2-D TV nozzle. The testing results show that applying the nozzle control schedules recommended in this paper avoids the performance degradation when the nozzle deflects. This work advances the field of engine/nozzle integrated modeling, and helps to instruct the simulation and experimentation to better fit the needs of engine modeling and engineering applications.

Gas Turbine Performance Simulation Using an Optimized Axial Flow Compressor

2006 ◽  
Author(s):  
Cleverson Bringhenti ◽  
Jesui´no Takachi Tomita ◽  
Francisco de Sousa Ju´nior ◽  
Joa˜o R. Barbosa
Keyword(s):  
Computer Program ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Axial Flow ◽  
Engine Performance ◽  
Design Parameters ◽  
Axial Flow Compressor ◽  
Surge Margin ◽  
Flow Compressor ◽  
And Control

Gas turbines need to operate efficiently due to the high specific fuel consumption. In order to reach the best possible efficiency the main gas turbine components, such as compressor and turbine, need to be optimized. This work reports the use of two specially developed computer programs: AFCC [1, 2] and GTAnalysis [3, 4] for such purpose. An axial flow compressor has been designed, using the AFCC computer program based on the stage-stacking technique. Major compressor design parameters are optimized at design point, searching for best efficiency and surge margin. Operation points are calculated and its characteristics maps are generated. The calculated compressor maps are incorporated to the GTAnalysis computer program for the engine performance calculation. Restrictions, like engine complexity, manufacture difficulties and control problems, are not taken into account.

Model-Based Design and Optimization for Large Bore Engines: Some Industrial Case Studies

2020 ◽  
Vol 142 (10) ◽  
Author(s):  
Prashant Srinivasan ◽  
Sanketh Bhat ◽  
Manthram Sivasubramaniam ◽  
Ravi Methekar ◽  
Maruthi Devarakonda ◽  
...  
Keyword(s):  
System Design ◽  
Case Studies ◽  
Control Strategy ◽  
Cost Optimization ◽  
Engine Performance ◽  
Design And Optimization ◽  
Model Based ◽  
Performance Requirements ◽  
Engine Design ◽  
And Control

Abstract Large bore reciprocating internal combustion (IC) engines are used in a wide variety of applications such as power generation, transportation, gas compression, mechanical drives, and mining. Each application has its own unique requirements that influence the engine design and control strategy. The system architecture and control strategy play a key role in meeting the requirements. Traditionally, control design has come in at a later stage of the development process, when the system design is almost frozen. Furthermore, transient performance requirements have not always been considered adequately at early design stages for large engines, thus limiting achievable controller performance. With rapid advances in engine modeling capability, it has now become possible to accurately simulate engine behavior in steady-states and transients. In this paper, we propose an integrated model-based approach to system design and control of reciprocating engines and outline ideas, processes, and real-world case studies for the same. Key benefits of this approach include optimized engine performance in terms of efficiency, transient response, emissions, system and cost optimization, and tools to evaluate various concepts before engine build thus leading to significant reduction in development time and cost.

Using Co-Simulation Methods to Establish Variable Valve Actuation Hardware Specifications and Control Strategies

2001 ◽  
Author(s):  
Reinhard Burk ◽  
Frederic Jacquelin ◽  
Russell Wakeman
Keyword(s):  
Internal Combustion Engines ◽  
Production Systems ◽  
Control Strategies ◽  
Engine Performance ◽  
Cost Effective ◽  
Dynamics Simulation ◽  
Variable Valve Actuation ◽  
Variable Valve ◽  
And Control ◽  
Valve Actuation

Abstract With the increasing recognition that variable valve actuation (VVA) in its various forms is a powerful tool for optimizing the performance of internal combustion engines, more and more production systems are being designed and implemented throughout the industry. However, as these control systems become more capable of altering lift, timing, duration, and even the number of valve events, the complexity of designing algorithms and calibrating them becomes enormous. In addition, without prior knowledge of an engine’s response to these algorithms, designing a cost-effective mechanism which provides adequate but not over-reaching capability is difficult. Ricardo has developed methodology for timestep coupled simulations which enables the use of one-dimensional (1-D) gas dynamics simulation of engine performance (WAVE™) coupled to a simulation of the valve actuation mechanism constructed in MATLAB® and AMESim®. This arrangement allows valve motion input to the 1-D code to be controlled either manually or by a VVA controller simulation, allowing such engine parameters as torque, fuel consumption, NVH, and EGR rates to be monitored as a function of valve timing strategy. This method allows the examination of such engine development concerns as tolerances, valve velocities and accelerations, and interactions with other engine controls to be studied without the costs, leadtimes, or hardware reliability problems that are associated with prototyping a VVA system. In addition, the interfacing of the valve control/engine performance simulation combination with the Design of Experiments optimization software iSIGHT allows the control system space to be explored automatically, without the brute force numerical search required to examine all permutations of the control strategies. The output of this procedure is an array of requirements which can be quickly translated into a specification document which will guide hardware and controls design efforts.

GDI flex fuel engine: Influence of different fuels on the performance

2020 ◽  
pp. 146808742097035
Author(s):  
Guilherme Bastos Machado ◽  
Tadeu C. Cordeiro de Melo ◽  
Katia Moniz da Silva
Keyword(s):  
Fossil Fuels ◽  
Combustion Engine ◽  
Direct Injection ◽  
Engine Performance ◽  
Gasoline Direct Injection ◽  
Low Carbon ◽  
High Efficient ◽  
Flex Fuel ◽  
Hydrous Ethanol ◽  
And Control

The internal combustion engine has been the main source of automotive propulsion for more than 100 years, but nowadays is facing challenges to significantly increase efficiency and reduce pollutants in the path to a low carbon mobility world. In this scenario, several developments have been implemented in the last years and new researches are being developed aiming high efficient and low emission vehicles. More stringent specifications for the fossil fuels and their blends with biofuels can play an important role to reduce carbon footprint of these new engines. In Brazil, since the 1970’s ethanol is widely used for spark ignited engines, either pure or blended in the gasoline (Brazilian gasoline). Brazilian flex fuel vehicles, which can run on hydrous ethanol, Brazilian gasoline or any mixture of these fuels, were released in 2000’s and represent nowadays over 90% of national light duty vehicles production. More recently, gasoline direct injection (GDI) technology was released at Brazilian flex fuel engines. Regarding fuel market, imported gasoline increased its share in recent years and although the compliance with the Brazilian specification, some properties may have significant differences compared to the ones of the average gasoline produced in Brazil. Results of performance, fuel consumption and combustion parameters of a GDI flex fuel engine running on hydrous ethanol and two different gasolines, one imported and other produced in Brazil, are shown in this paper. It is commented that flexibility to use gasoline and ethanol should be accompanied with more sophisticated engine hardware and control software to better explore the potential of the different fuels, and that different types of gasolines can affect many engine performance parameters, although this can be minimized adopting more tight fuels specifications. It is concluded that flex fuel engine designs and calibrations could be improved to obtain optimized performance with different fuels.

Sign in / Sign up

Export Citation Format

Share Document