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In this study, the performance of a twin-shaft Industrial Gas Turbine (IGT) at fouling conditions is simulated through a Simulink model based on fundamental thermodynamics. Engine measurements across a twin-shaft IGT system during compressor fouling conditions were considered to validate this study. By implementing correlation coefficients in the compressor model, it is possible to predict the performance...
Air filter diagnostics/prognostics are needed to determine the condition of the intake air filter in internal combustion engines and to indicate the need for maintenance. Monitoring air filter health helps saving on operational costs, maintaining optimal fuel economy, and planning for service/maintenance before failure. In the present paper, we propose an air filter diagnostics/prognostics method...
This paper presents an alternative control to maintain the air-fuel-ratio (AFR) of port-injected spark ignition (SI) engines at certain value, i.e. stoichiometric value, to improve the fuel economy. We first reformulate the AFR regulation problem as a tracking control for the injected fuel mass flow rate, which can simplify the control synthesis when the fuel film dynamics are taken into account....
The modelling and calculation of charge cycles with conventional intake manifold pressure based extensions is difficult to implement in real-time for combustion engines with extra actuators in valve train (VVT - variable valve timing) on current control units. Additionally, there is a high parametrization effort due to a variety of engine characteristics of this approach. In this paper we will analyse...
Diesel oxidation catalysts (DOCs) have become standard components in Diesel engine aftertreatment systems to reduce carbon monoxide (CO) and unburned hydrocarbon (HC) emissions. Intensive studies have been focused on improving the performance of DOCs which has been found to be influenced significantly by its thermal behaviors. The objective of this research is to develop a control-oriented thermal...
The reliability of electrical components is an essential factor for vehicle lifetime considerations. Failure mechanisms of these components are accelerated by temperature levels and temperature cycles. Detailed knowledge about the transient temperature behavior and generated heat are key factors in designing both reliable and cost-optimized electrical components. Engine operation and vehicle driving...
The Mean Value Engine Model, commonly used in model based fault estimation of automotive spark ignition gasoline engines describes only the averaged dynamics of the engines, resulting in reduced sensitivity and isolability of faults. In this paper, estimation of faults is done using an instantaneous physics based within cycle model of the gasoline engine. A novel method for estimating certain types...
A thermal management model of a rear engine compartment was established with STAR-CCM+.The on-site temperature measurement data were used to calibrate the established model and to demonstrate the validity of the simulation results. Boundary conditions and parameters were then readjusted to match the worst working condition. Flow and temperature fields for this condition were obtained through simulation...
Mathematical modeling represents an efficient method allowing us to examine properties of a researched object. Realization of mathematic models has become a fundamental part of design of many complex systems. By use of simulation, we can experiment with mathematical model similarly as with the real object without the risk of damage and with much lower expenses. Modeling represents experimental process...
Faults affecting the automotive engines can potentially lead to increased emissions, increased fuel consumption or engine damage. These negative impacts may be prevented, or at least alleviated, if faults can be detected and isolated in a timely manner. The US Federal and State regulations dictate that automotive engines operate with an On-Board Diagnosis (OBD) system to enable the detection of faults...
The relationship between the air data system and the flight guidance and control (G&C) system design requirements which assure proper trajectory management of air-breathing hypersonic vehicles is explored. The type and precision of on-board state measurements dictated by G&C operations are characterized. Candidate procedures for their measurement are examined including assessment of likely...
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