Optimal Control with Input Constraints applied to Internal Combustion Engine Test Benches

2013 ◽  
Vol 46 (23) ◽  
pp. 463-468 ◽  
Author(s):  
Thomas E. Passenbrunner ◽  
Mario Sassano ◽  
Luigi del Re
Keyword(s):  
Optimal Control ◽  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Engine Test ◽  
Input Constraints

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.

Optimal Control of the Heat Release Rate of an Internal Combustion Engine With Pressure Gradient, Maximum Pressure, and Knock Constraints

2014 ◽  
Vol 136 (6) ◽  
Author(s):  
Florian Zurbriggen ◽  
Tobias Ott ◽  
Christopher Onder ◽  
Lino Guzzella
Keyword(s):  
Optimal Control ◽  
Pressure Gradient ◽  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Mechanical Work ◽  
Maximum Pressure ◽  
Temperature Dependent ◽  
Ideal Gases ◽  
Burn Rate

In this paper, we present an analysis of the optimal burn rate in an internal combustion engine (ICE) considering pressure gradient, maximum pressure, and knocking. A zero-dimensional model with heat losses is used for that purpose. The working fluids are assumed to behave like ideal gases with temperature dependent gas properties. In the first part, it is assumed that the burn rate can be arbitrarily chosen at every time instance in order to maximize the mechanical work. This leads to an optimal control problem with constraints. In the second part, a Vibe type burn rate is assumed, where the center of combustion, the duration and the form factor can be chosen in order to maximize the mechanical work. This Vibe type burn rate is finally compared with the arbitrary combustion as the benchmark in order to evaluate the potential of the more realistic burn shape.

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