scholarly journals Control Applied to a Reciprocating Internal Combustion Engine Test Bench under Transient Operation: Impact on Engine Performance and Pollutant Emissions

Energies ◽  
2017 ◽  
Vol 10 (11) ◽  
pp. 1690 ◽  
Author(s):  
Ismael Payo ◽  
Luis Sánchez ◽  
Enrique Caño ◽  
Octavio Armas
Keyword(s):  
Internal Combustion Engine ◽  
Test Bench ◽  
Combustion Engine ◽  
Engine Performance ◽  
Internal Combustion ◽  
Pollutant Emissions ◽  
Engine Test ◽  
Engine Test Bench ◽  
Transient Operation

Improved throttle valve modeling for spark-ignition engine simulations

2018 ◽  
Vol 233 (6) ◽  
pp. 1614-1622 ◽  
Author(s):  
Elie Haddad ◽  
David Chalet ◽  
Pascal Chesse
Keyword(s):  
Internal Combustion Engine ◽  
Discharge Coefficient ◽  
Test Bench ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Simulation Software ◽  
Spark Ignition Engine ◽  
Engine Test ◽  
Engine Simulation ◽  
Throttle Valve

Automotive manufacturers nowadays are constantly working on improving their internal combustion engines’ performance by reducing the fuel consumption and emissions, without compromising the power generated. Manufacturers are therefore relying on virtual engine models that can be run on simulation software in order to reduce the amount of time and costs needed, in comparison with experiments done on engine test benches. One important element of the intake system of an internal combustion engine is the throttle valve, which defines the amount of air reaching the plenum before being drawn into the cylinders. This article discusses a widely used model for the estimation of air flow rate through the throttle valve in an internal combustion engine simulation. Experiments have been conducted on an isolated throttle valve test bench in order to understand the influence of different factors on the model’s discharge coefficient. These experiments showed that the discharge coefficient varies with the pressure ratio across the throttle valve and with its angle. Furthermore, for each angle, this variation can be approximated with a linear model composed of two parameters: the slope and the Y-Intercept. These parameters are calibrated for different throttle valve angles. This calibration can be done using automotive manufacturers’ standard engine test fields that are often available. This model is then introduced into an engine simulation model, and the results are compared to the experimental data of a turbocharged engine test bench for validation. They are also compared with a standard discharge coefficient model that varies only with the throttle valve angle. The results show that the new model for the discharge coefficient reduces mass flow estimation errors and allows expanding the applications of the throttle valve isentropic nozzle model.

Assessment of Cycle Averaged Turbocharger Maps Through One Dimensional and Mean-Line Coupled Codes

2013 ◽  
Author(s):  
Meng Soon Chiong ◽  
Srithar Rajoo ◽  
Aaron W. Costall ◽  
Wan Saiful-Islam Bin Wan Salim ◽  
Alessandro Romagnoli ◽  
...  
Keyword(s):  
Internal Combustion Engine ◽  
Performance Prediction ◽  
Combustion Engine ◽  
Engine Performance ◽  
Internal Combustion ◽  
Development Stage ◽  
Pollutant Emissions ◽  
One Dimensional ◽  
Engine Model ◽  
Industry Practice

Downsizing the internal combustion engine has been shown to be an effective strategy towards CO2 emissions reduction, and downsized engines look set to dominate automotive powertrains for years to come. Turbocharging has been one of the key elements in the success of downsized internal combustion engine systems. The process of engine-turbocharger matching during the development stage plays a significant role towards achieving the best possible system performance, in terms of minimizing fuel consumption and pollutant emissions. In current industry practice, engine modeling in most cases does not consider the full unsteady analysis of the turbocharger turbine. Thus, turbocharged engine performance prediction is less comprehensive, particularly under transient load conditions. Commercial one-dimensional engine codes are capable of satisfactory engine performance predictions, but these typically assume the turbocharger turbine to be quasi-steady, hence the inability to fully resolve the pulsating flow performance. On the other hand, a one-dimensional gas dynamic turbine model is capable of simulating the pressure wave propagation in the model domain, thus serving as a powerful tool to analyze the unsteady performance. In addition, a mean-line model is able to compute the turbine power and efficiency through the conservation method and Euler’s Turbomachinery Equation. However, none of these modeling methods have been widely implemented into commercial one-dimensional engine codes thus far. The objective of this paper is to assess the possibility of numerically producing the steady equivalent cycle averaged turbocharger turbine maps, which could be used in commercial engine codes for performance prediction. The cycle-averaged maps are obtained using a comprehensive turbocharged engine model including accurate pulsating exhaust flow performance prediction. The model is validated against experimental results and effects of flow frequency on the maps are discussed in detail.

Engine Enhancement Using Enriched Oxygen Inlet

2015 ◽  
Vol 48 ◽  
pp. 37-49 ◽  
Author(s):  
Singh P. Shivakumar
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Engine Performance ◽  
Calorific Value ◽  
Internal Combustion ◽  
Fuel Tank ◽  
Atmospheric Air ◽  
Oxygen Percentage

An internal combustion engine essentially requires a fuel which must have sufficient calorific value to produce enough power, and oxygen for the combustion of fuel. In normal vehicles fuel will be supplied from a fuel tank equipped with it. And oxygen will be taken from the atmospheric itself. Under normal conditions the percentage of oxygen present in atmospheric air will be around 21% of the total volume. Studies shows that by increasing the oxygen percentage in the inlet air increases engine performance and reduces emission produced by the engine.

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