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In this paper, the energy flow characteristics of turbo charging system were studied on a gasoline direct injection engine. Based on engine dyno tests, various kinds of intake and exhaust parameters were measured under mapping characteristics, and then the maps of turbo charging system energy flows were acquired by combining energy balance equations. On this basis, the exhaust energy recovery efficiency...
Based on simulation software GT-drive, the author analyzed the transmission system performance of a passenger car with diesel engine and provided the appropriate research methods. Firstly, the numerical simulation model of a vehicle was built based on vehicle weight, frontal area, rolling, air-drag coefficient, etc. The different matching schemes were simulated and compared. The results show that,...
Discussed in this paper are the challenges facing the boosting systems of Low Temperature Combustion (LTC) system. A new term named “Gas to Fuel Ratio (GFR) in cylinder” is introduced to deal with the combined dilution effect of fresh air and cooled external EGR. Formulas are derived to illuminate the fundamental relationship between engine BMEP and GFR targets, with the required mass flowrate and...
Established in this paper is a numerical simulation based design concept for engine valve train. This is realized by combining traditional design theory and advanced simulation technologies: i.e. the kinematics analysis, dynamics analysis, engine gas exchange process optimization, finite element analysis of the camshaft, fatigue analysis, as well as the simulation study of influences on engine's noise...
This paper has studied the fatigue and friction of big end bearing on an engine connecting rod by combining the multi-body dynamics and hydrodynamic lubrication model. First, the basic equations and the application on AVL-Excite software platform of multi-body dynamics have been described in detail. Then, introduce the hydrodynamic lubrication model, which is the extended Reynolds equation derived...
Accurate control of the in-cylinder air/fuel ratio level is critical for both fuel saving and harmful emission reduction of an internal combustion engine. The fuel injection quantity is easy to control with today's electronically controlled fuel injection system, the difficulty is how to accurately determine the fresh charge mass trapped in-cylinder at the end of the gas exchange process, especially...
This article has proposed a new method for designing and studying engine intake system based on the technology of CAD/CAE/CFD integration. Firstly, according to the similarity principle and pressure wave theory, the structure parameters of target engine intake system were defined referencing the similar engine. Then, the intake system parameters were input into GT-power, and the intake system performance...
A PID control is developed for robust control of EGR (Exhaust Gas Recirculation) system in a gasoline engine. First a GT-power model of the gasoline engine with EGR system was built and verified. Then a PID controller was built using Simulink/Matlab and coupled with the GT-power engine model. A suitable tuning strategy for the PID controllers is also developed. Its response characteristics and performance...
The state assessment system of power transformer equipments based on data mining and fuzzy theory is introduced briefly in this article. The statistics-based association rule mining will be used as data preprocessing method. Assess model of power transformer equipments is created according to standards of Transformation Condition-Based Maintenance equipment which is carried out by State Power Grid...
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