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The main objective of this study was to develop a model for performance analysis of a spark ignition engine fueled with propane and octane. GT-Suite software was used to develop the model for a single cylinder 4-stroke gasoline engine having a bore of 85 mm and a stroke of 85 mm with a capacity of 0.48 litres. A one-dimensional gas dynamics was considered for heat transfer model development for different...
The dependability analysis is crucial for a wide range of systems. It becomes even more difficult to assess when dealing with cyber-physical systems (CPSs), being resulting as an integration of physical and cyber parts, strongly interacting to provide a service or a function. In this context, the dependability analysis of a Deicing System (DS), which aims at preventing or decreasing the ice accretion...
The following article presents the modeling and control of a refrigeration system for fruit preservation. The mathematical model developed is based on mass balance and energy balance. It has been developed in two blocks: analysis in the refrigeration components and analysis in the conservation chamber. In the refrigeration system the elements have been studied: compressor, condenser, expansion valve,...
Air-conditioning systems have been extensively used in current society. As a vital part of air-conditioning systems, the vapor compressor refrigeration cycle (VCC) systems have attracted broad attention. In this study, a VCC temperature controller is developed according to the model predictive control (MPC) method. Firstly, a model identification approach is used to model the simplified temperature...
Energy saving of compressed air system was studied in this work. The whole process model including compressor's performance, pressure loss of pipeline and pressure change of storage tank was founded. And then compared with performance equations of FSD compressors, energy cost and related Volumetric efficiency change along the variable frequency was achieved. With these models founded, simulations...
This paper introduces the application of model based systems engineering (MBSE) method in designing cabin pressurization control system (PCS) for civil aircraft. Rhapsody and Simulink are used as the design and simulation tools. Use cases, functions flow, and state-machines of the system are built by corresponding models in three MBSE design phases, i.e. requirements analysis, function analysis and...
Toward model-based development of automotive engines, it is crucial to develop an effective method to construct their accurate and low-complexity models. In this paper, we conduct an experimental study on sparse modeling of a diesel engine air path system. First, we apply two standard methods and examine their trade-offs; the Gaussian process regression that can provide a confidence interval; the...
This paper presents a tracking controller for a long pneumatic transmission line modeled by a bidirectionally coupled system of partial differential equations (PDEs) and ordinary differential equations (ODEs). The feedforward part of the controller is designed by applying a flatness-based approach for hyperbolic PDEs to a second-order quasilinear model of the pneumatic system. The stabilizing feedback...
In this paper, a nonlinear control approach is presented for an electro-pneumatic clutch actuator for heavy trucks. A clutch is required at start-up or during gear shifts to disconnect the combustion engine from the gear box. This automated actuator provides the necessary actuation force according to the large torque transmitted through the power train. Based on a control-oriented system representation,...
Thermal regulation of aircraft cabins requires controlling the temperature of supplied fresh air. State of the art plant architectures support only a small number of temperature zones. In this paper we consider a novel architecture that allows an arbitrary number of temperature zones. This is bought at the expense of a more complex control problem. Control challenges connected to this novel architecture...
This paper mainly studies the locomotive braking system flowmeter. The purpose of this paper is to accurately measure and display the air flow rate of locomotive braking system. So we can judge the opened and closed state and the closed specific location of the coupling cock. This study can prevent the locomotive brake failure and reduce the number of traffic accidents. In this paper, the appearance...
In order to realize performance test and experimental research for the accessories of aircraft fuel system, a type of integrative testing system is designed in this paper. It can accomplish function and performance tests for accessories of aircraft fuel system, and also can execute fault detection experiments. The simulation model of the system is established by using the software of AMESim, and the...
Testability is an important feature for system which is easy to test and diagnose. A system or equipment with good testability can effectively reduce the time of fault detection and isolation, reduce life cycle costs and improve system reliability and security. In view of the importance of the normal operation of the hydraulic system to the safe flight of the aircraft and the difficulty of accurately...
This paper presents a multi-variable optimal controller design based on model predictive control (MPC) scheme for automotive gasoline engines. The optimal control aims to achieve fast torque tracking with the lower pumping loss, by tuning the throttle valve angle and the intake valve timing. To this end, the nonlinear engine model was built based on the mean-value modeling theory and polynomial technique,...
This paper deals with maximizing coefficient of performance (COP) of R744 automotive heat pump. A high-side pressure variation is possible during transcritical operation employing low pressure receiver and electronic expansion valve (EXV). The optimal high-side pressure is then determined using Fibonacci search method. This approach is one of possible methods of online high-side pressure control and...
Stiction in control valve is one of the long-standing and common problems in the process industries, which accelerates equipment wear and even affects the stability of closed-loop systems. A valve stiction model is proposed to describe the dynamic feature of sticky valve. To detect and quantify valve stiction, a bootstrap Hammerstein system identification procedure is proposed. Through the identified...
This paper proposes a model predictive strategy for air path control turbocharged Spark Ignition (SI) engines with low pressure Exhaust Gas Recirculation (EGR). The proposed Nonlinear Model Predictive Controller (NMPC) is designed to track manifold pressure and EGR concentration reference, by manipulating throttle, EGR valve, continuous surge valve and waste gate. The NMPC is solved in real time using...
In this paper, explicit model predictive control (MPC) of a two-stage turbocharged diesel engine is presented. MPC provides superior performance over conventional map-based PID boost pressure control. It can be easily adapted to multivariable control and is relatively easy to tune. A control-oriented multiple-input multiple-output model of a turbocharged diesel engine was derived using system identification...
This paper deals with coefficient of performance (COP) maximization of automotive R744 heat pump using Nelder-Mead simplex method. The COP maximum is searched using high-side pressure adjustment, what is possible and necessary during transcritical operation. Selected approach allows efficient heat pump operation, fast COP maximum localization, minimum number of needed actuator changes and resistance...
Wind tunnels used for testing purposes help in analysing the forces, pressure fields and the flow patterns of air around a test specimen. This helps improving the specimen body so as to optimize the performance in the actual working model. The tests conducted are at high as well as low velocity to simulate the natural working environment when the body is in motion in the fluid. This involves maintaining...
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