EXPERT SYSTEM APPROACH USING GRAPH REPRESENTATION AND ANALYSIS FOR VARIABLE-STROKE INTERNAL-COMBUSTION ENGINE DESIGN

1990 ◽  
pp. 85-104 ◽  
Author(s):  
STEWART N. T. SHEN ◽  
MENG-SANG CHEW ◽  
GHASSAN F. ISSA
Keyword(s):  
Expert System ◽  
Internal Combustion Engine ◽  
System Approach ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Graph Representation ◽  
Engine Design

EXPERT SYSTEM APPROACH USING GRAPH REPRESENTATION AND ANALYSIS FOR VARIABLE-STROKE INTERNAL-COMBUSTION ENGINE DESIGN

1990 ◽  
Vol 04 (03) ◽  
pp. 389-408 ◽  
Author(s):  
STEWART N. T. SHEN ◽  
MENG-SANG CHEW ◽  
GHASSAN F. ISSA
Keyword(s):  
Expert System ◽  
Particle Physics ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Graph Representation ◽  
Preliminary Design ◽  
Practical Applications ◽  
Design Alternatives ◽  
Engine Design

Even though AI technology is a relatively new discipline, many of its concepts have already found practical applications. Expert systems, in particular, have made significant contributions to technologies in such fields as business, medicine, engineering design, chemistry, and particle physics. This paper describes an expert system developed to aid mechanical engineering designers in the preliminary design of variable-stroke internal-combustion engines. Variable-stroke engines are more economical in fuel consumption but their design is particularly difficult to accomplish. With the traditional design approach, synthesizing the mechanisms for the design is rather difficult and evaluating the mechanisms is an even more cumbersome and time-consuming effort. Our expert system assists the designer by generating and evaluating a large number of design alternatives represented in the form of graphs. Through the application of structural and design rules obtained from design experts to the graphs, good quality preliminary design configurations of the engines are promptly deduced. This approach can also be used in designing other types of mechanisms.

Improving the design of an internal combustion engine with counter pistons

2021 ◽  
pp. 3-6
Author(s):  
Keyword(s):  
Internal Combustion Engine ◽  
Dynamic Characteristics ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Maximum Torque ◽  
Moment Vector ◽  
Engine Design ◽  
Torque Moment ◽  
Dimensional Parameters ◽  
Crank Mechanism

A new layout of a two-cylinder internal combustion engine with counter-pistons is proposed, which increases its efficiency by reducing the pressure angles. The dynamics of the proposed arrangement of a two-shaft crank-slider internal combustion engine, which provides maximum torque moment at maximum gas pressure in the minimum volume of the combustion chamber, is investigated, which reduces the load on the engine design and its weight and dimensional parameters. The research was carried out by comparing the dynamic characteristics of different engines using vector modular models and the KDAM program. Keywords: internal combustion engine, crank mechanism, indicator diagram, dynamic characteristics, torque moment, vector, contour, model, module [email protected]

Accuracy of identification of the state of the internal combustion engine with the customized model using the measuring expert system

2021 ◽  
pp. 54-67
Author(s):  
Иван Петрович Добролюбов ◽  
Олег Федорович Савченко ◽  
Виктор Валентинович Альт ◽  
Олег Владимирович Ёлкин ◽  
Денис Николаевич Клименко
Keyword(s):  
Expert System ◽  
Internal Combustion Engine ◽  
Computer Model ◽  
Gradient Method ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Technical Condition ◽  
The State ◽  
Actual State ◽  
Operational Conditions

Рассмотрены вопросы уменьшения погрешности идентификации технического состояния двигателя внутреннего сгорания и его составных частей как объекта экспертизы путем настраивания параметров применяемой в измерительной экспертной системе виртуальной модели ДВС. Для настройки модели предложено применение градиентного метода, обеспечивающего наиболее быструю минимизацию погрешности идентификации Purpose and methods. Improving the accuracy of identification for the technical condition of the internal combustion engine (ICE) in operational conditions using the engine measurement expert system (EMSE) is addressed by adjusting the computer dynamic model of the internal combustion engine. Results. Algorithmic schemes of computer models for the state of the ICE are obtained using the equations of its dynamics, which takes into account the factors such as the movement of the fuel supply body, the force on the hook - the load. The structural schemes of modeling at the input of a step-by-step action are presented. A promising method of tuning the model in the EMSE is proposed, which consists of measuring its working processes, in particular the angular acceleration of the crankshaft, for a specific brand of ICE. Then the corresponding set of models of its technical condition is obtained: normal, permissible, limit, pre-accident and emergency. By adjusting the values of the coefficients of these models in the EMSE, they achieve their coincidence with the actual state of the ICE. The identification error is minimized using the gradient method of steepest descent. The presence of several computer models is a practical advantage in the examination of the technical condition of the tested engines allowing its effective implementation in operational conditions. In this case, based on the experience of operation, the computer model closest to the actual state of the ICE is adjusted. At the same time, the efficiency of localization of ICE malfunctions increases, since the coefficients reflecting the state of the engine components and systems are consistently adjusted. Conclusions. The application of the proposed methodology using the criterion of minimizing the identification error by the gradient method allows implementation of this effective method for identifying the state of the ICE. It increases the reliability of determining the technical state of the ICE and its components by adjusting the computer model

scholarly journals Research of the efficiency of using the Miller cycle of an internal combustion engine

2021 ◽  
Vol 22 (2) ◽  
pp. 196-204
Author(s):  
Sergei V. Smirnov ◽  
Alexander R. Makarov ◽  
Ivan A. Zaev ◽  
Gulnara T. Khudaibergenova
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Real Data ◽  
Internal Combustion ◽  
Expansion Ratio ◽  
Miller Cycle ◽  
Otto Cycle ◽  
Atkinson Cycle ◽  
Engine Design ◽  
Intake Pressure

The article is devoted to the study of the possibilities of improving the technical and economic indicators of an internal combustion engine (ICE) through the use of the Miller cycle with a shortened intake. A review of scientific works on the use of the Atkinson cycle and Miller cycle in an internal combustion engine is carried out. A comparative analysis of theoretical cycles: Otto cycle, Atkinson cycle and Miller cycle is carried out. Calculated studies of the influence of the expansion ratio and the pressure increase ratio on the efficiency of the Atkinson cycle have been carried out. The ratios are presented that allow using the Miller cycle with a short inlet to obtain the same theoretical efficiency of the cycle as that of the Atkinson cycle. At the same time, the implementation of the Miller cycle in a real engine design significantly exceeds the possibilities of using the Atkinson cycle. The results of the study showed that the use of the Miller cycle with a shortened intake is preferable, but it must necessarily increase the compression ratio and intake pressure through the use of boost. On the example of real data of the main parameters of the cycle, it is shown that the use of the theoretical Miller cycle can provide a significant up to 12.2% increase in the efficiency of the cycle compared to the Otto cycle. The ratios, conditions and recommendations are presented that allow the effective use of the Miller cycle with a shortened intake in a real engine design.

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