scholarly journals Adaptive Air Charge Estimation for Turbocharged Diesel Engines Without Exhaust Gas Recirculation

2004 ◽  
Vol 126 (3) ◽  
pp. 633-643 ◽  
Author(s):  
Ove F. Storset ◽  
Anna G. Stefanopoulou ◽  
Roy Smith
Keyword(s):  
Diesel Engines ◽  
Exhaust Gas Recirculation ◽  
Mean Value ◽  
Adaptive Observer ◽  
Intake Manifold ◽  
Exhaust Gas ◽  
Engine Model ◽  
Intake Manifold Pressure ◽  
Gas Recirculation ◽  
Better Than

The paper presents an adaptive observer for in-cylinder air charge estimation for turbocharged diesel engines without exhaust gas recirculation (EGR). We assess the observability of the mean value engine model when the intake manifold pressure and the compressor flow are measured, and the performance of the observer is compared to existing schemes analytically and with limited simulations. Specifically, it is shown that the designed observer performs better than the conventional schemes during fast step changes in engine fueling level, eventhough it uses a simple but time varying parameterization of the volumetric efficiency. Furthermore, the estimate is less sensitive to changes in engine parameters than the existing schemes.

scholarly journals Control-oriented modeling of two-stroke diesel engines with exhaust gas recirculation for marine applications

2018 ◽  
Vol 233 (2) ◽  
pp. 551-574 ◽  
Author(s):  
Xavier Llamas ◽  
Lars Eriksson
Keyword(s):  
Diesel Engines ◽  
Measurement Data ◽  
Simulation Models ◽  
Exhaust Gas Recirculation ◽  
Mean Value ◽  
Exhaust Gas ◽  
Cylinder Pressure ◽  
Engine Model ◽  
Marine Applications ◽  
Gas Recirculation

Large marine two-stroke diesel engines are widely used as propulsion systems for shipping worldwide and are facing stricter NO x emission limits. Exhaust gas recirculation is introduced to these engines to reduce the produced combustion NO x to the allowed levels. Since the current number of engines built with exhaust gas recirculation is low and engine testing is very expensive, a powerful alternative for developing exhaust gas recirculation controllers for such engines is to use control-oriented simulation models. Unfortunately, the same reasons that motivate the use of simulation models also hinder the capacity to obtain sufficient measurement data at different operating points for developing the models. A mean value engine model of a large two-stroke diesel with exhaust gas recirculation that can be simulated faster than real time is presented and validated. An analytic model for the cylinder pressure that captures the effects of changes in the fuel control inputs is also developed and validated with cylinder pressure measurements. A parameterization procedure that deals with the low number of measurement data available is proposed. After the parameterization, the model is shown to capture the stationary operation of the real engine well. The transient prediction capability of the model is also considered satisfactory which is important if the model is to be used for exhaust gas recirculation controller development during transients. Furthermore, the experience gathered while developing the model about essential signals to be measured is summarized, which can be very helpful for future applications of the model. Finally, models for the ship propeller and resistance are also investigated, showing good agreement with the measured ship sailing signals during maneuvers. These models give a complete vessel model and make it possible to simulate various maneuvering scenarios, giving different loading profiles that can be used to investigate the performance of exhaust gas recirculation and other controllers during transients.

Diesel Engine Intake Condition Control-Oriented Models for Active Fuel Injection Profile Control

2011 ◽  
Author(s):  
Fengjun Yan ◽  
Junmin Wang
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Fuel Injection ◽  
Combustion Process ◽  
Exhaust Gas Recirculation ◽  
High Fidelity ◽  
Exhaust Gas ◽  
Engine Model ◽  
Profile Control ◽  
Gas Recirculation

Fueling control in Diesel engines is not only of significance to the combustion process in one particular cycle, but also influences the subsequent dynamics of air-path loop and combustion events, particularly when exhaust gas recirculation (EGR) is employed. To better reveal such inherently interactive relations, this paper presents a physics-based, control-oriented model describing the dynamics of the intake conditions with fuel injection profile being its input for Diesel engines equipped with EGR and turbocharging systems. The effectiveness of this model is validated by comparing the predictive results with those produced by a high-fidelity 1-D computational GT-Power engine model.

Airpath Controls of Turbocharged Diesel Engines With Disturbance Input Observers

2008 ◽  
Author(s):  
Chia-Shang Liu
Keyword(s):  
Diesel Engines ◽  
Disturbance Observer ◽  
Coupling Effect ◽  
Engine Performance ◽  
Intake Manifold ◽  
Exhaust Gas ◽  
Engine Model ◽  
Emission Regulation ◽  
Classical Control ◽  
Intake Manifold Pressure

To achieve stringent emission regulation standard and deliver desired engine performance, modern diesel engines are equipped with an exhaust gas recirculation system and a turbocharger to regulate the fraction of exhaust gas and intake manifold pressure. Due to the actuator coupling effect and the high nonlinearity of the system behavior, it is difficult to apply classical control designs in such a case. To solve this issue, this paper presents a disturbance observer based approach for the airpath controls of turbocharged diesel engines. The disturbance observer is synthesized with the controller to compensate the unknown dynamics and system uncertainties of the engine plant that will make the controller more robust and less dependent on the accuracy of mathematical modeling. The performance of proposed observer and controller schemes are demonstrated by numerical simulation with a full order diesel engine model.

A new mass and temperature control valve for exhaust gas recirculation in car diesel engines

MTZ worldwide ◽  
2007 ◽  
Vol 68 (12) ◽  
pp. 21-23
Author(s):  
Thomas Holzbaur ◽  
Eike Willers ◽  
Achim Hess ◽  
Hans-Peter Klein ◽  
Markus Schuessler ◽  
...  
Keyword(s):  
Temperature Control ◽  
Diesel Engines ◽  
Control Valve ◽  
Exhaust Gas Recirculation ◽  
Exhaust Gas ◽  
Gas Recirculation

scholarly journals Learning reference governor for cycle-to-cycle combustion control with misfire avoidance in spark-ignition engines at high exhaust gas recirculation–diluted conditions

2020 ◽  
Vol 21 (10) ◽  
pp. 1819-1834
Author(s):  
Bryan P Maldonado ◽  
Nan Li ◽  
Ilya Kolmanovsky ◽  
Anna G Stefanopoulou
Keyword(s):  
Combustion Process ◽  
Exhaust Gas Recirculation ◽  
Operating Conditions ◽  
Intake Manifold ◽  
Exhaust Gas ◽  
Model Free ◽  
Recirculation Rate ◽  
Valve Position ◽  
Gas Recirculation ◽  
Reference Governor

Cycle-to-cycle feedback control is employed to achieve optimal combustion phasing while maintaining high levels of exhaust gas recirculation by adjusting the spark advance and the exhaust gas recirculation valve position. The control development is based on a control-oriented model that captures the effects of throttle position, exhaust gas recirculation valve position, and spark timing on the combustion phasing. Under the assumption that in-cylinder pressure information is available, an adaptive extended Kalman filter approach is used to estimate the exhaust gas recirculation rate into the intake manifold based on combustion phasing measurements. The estimation algorithm is adaptive since the cycle-to-cycle combustion variability (output covariance) is not known a priori and changes with operating conditions. A linear quadratic regulator controller is designed to maintain optimal combustion phasing while maximizing exhaust gas recirculation levels during load transients coming from throttle tip-in and tip-out commands from the driver. During throttle tip-outs, however, a combination of a high exhaust gas recirculation rate and an overly advanced spark, product of the dynamic response of the system, generates a sequence of misfire events. In this work, an explicit reference governor is used as an add-on scheme to the closed-loop system in order to avoid the violation of the misfire limit. The reference governor is enhanced with model-free learning which enables it to avoid misfires after a learning phase. Experimental results are reported which illustrate the potential of the proposed control strategy for achieving an optimal combustion process during highly diluted conditions for improving fuel efficiency.

Diesel engines with low-pressure exhaust-gas recirculation

MTZ worldwide ◽  
2008 ◽  
Vol 69 (2) ◽  
pp. 20-26 ◽  
Author(s):  
Stefan Münz ◽  
Christiane Römuss ◽  
Peter Schmidt ◽  
Kai-Henning Brune ◽  
Heinz-Peter Schiffer
Keyword(s):  
Diesel Engines ◽  
Exhaust Gas Recirculation ◽  
Low Pressure ◽  
Exhaust Gas ◽  
Gas Recirculation

An experimental investigation on performance, emissions, and combustion in a manifold injection for different exhaust gas recirculation flowrates in hydrogen—diesel dual-fuel operations

2008 ◽  
Vol 222 (11) ◽  
pp. 2131-2145 ◽  
Author(s):  
N Saravanan ◽  
G Nagarajan
Keyword(s):  
Experimental Investigation ◽  
Exhaust Gas Recirculation ◽  
Intake Manifold ◽  
Dual Fuel ◽  
Injection Timing ◽  
Exhaust Gas ◽  
Exhaust Gases ◽  
Injection Duration ◽  
Performance And Emissions ◽  
Gas Recirculation

Hydrogen is receiving considerable attention as an alternative fuel to replace the rapidly depleting petroleum-based fuels. Its clean burning characteristics help to meet the stringent emission norms. In this experimental investigation a single-cylinder diesel engine was converted to operate in hydrogen—diesel dual-fuel mode. Hydrogen was injected in the intake manifold and the diesel was injected directly inside the cylinder. The injection timing and the injection duration of hydrogen were optimized on the basis of performance and emissions. Best results were obtained with hydrogen injection at gas exchange top dead centre with an injection duration of 30° crank angle. The flowrate of hydrogen was optimized as 7.5l/min with optimized injection timing and duration. The optimized exhaust gas recirculation (EGR) flowrate was 20 per cent at 75 per cent load. The optimized timings were chosen on the basis of performance, emission, and combustion characteristics. The EGR technique was adopted in the hydrogen—diesel dual-fuel mode by varying the EGR flowrate from 0 per cent to 25 per cent in steps of 5 per cent. The maximum quantity of exhaust gases recycled during the test was 25 per cent (up to 75 per cent load); beyond that unstable combustion was observed with an increase in smoke. The brake thermal efficiency with 20 per cent EGR decreases by 9 per cent compared with diesel. The nitrogen oxide (NO x) emission in hydrogen manifold injection decreases by threefold with 20 per cent EGR operation at full load. The NO x emission tends to reduce drastically with increase in the EGR percentage at all load conditions owing to the increase in heat capacity of the exhaust gases. The smoke decreases by 80 per cent in the dual-fuel operation compared with diesel at 75 per cent load.

Exhaust gas recirculation trials with high-speed marine and rail diesel engines

MTZ worldwide ◽  
2006 ◽  
Vol 67 (1) ◽  
pp. 6-9
Author(s):  
Dirk Bergmann ◽  
Christian Philipp ◽  
Helmut Rall ◽  
Rolf Traub
Keyword(s):  
Diesel Engines ◽  
High Speed ◽  
Exhaust Gas Recirculation ◽  
Exhaust Gas ◽  
Gas Recirculation
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