Feasibility and Calibration Considerations for Selection of Combustion Control Features

Maldonado, Bryan P.; Solbrig, Charles E.; Stefanopoulou, Anna G.

doi:10.1109/ccta.2019.8920631

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…24 A more recent study showed that the angle Θ SA 50 = CA 50 + SA , which is the duration from spark to CA50, together with CA50 is sufficient for a feasible TITO tracking control problem. 25 This particular duration captures the effect of EGR on the flame growth rate, which is reduced under high dilution. In addition, by using the pair ( CA 50 , Θ SA 50 ) , the modeling effort for control design is reduced.…”

Section: Optimal Phasing and Combustion Limitsmentioning

confidence: 99%

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

Maldonado

Kolmanovsky

et al. 2020

International Journal of Engine Research

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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.

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Section: Optimal Phasing and Combustion Limitsmentioning

confidence: 99%

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

Maldonado

Kolmanovsky

et al. 2020

International Journal of Engine Research

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Portable In-Cylinder Pressure Measurement and Signal Processing System for Real-Time Combustion Analysis and Engine Control

Luo¹,

Maldonado²,

Liu³

et al. 2020

SAE Int. J. Adv. & Curr. Prac. in Mobility

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<div class="section abstract"><div class="htmlview paragraph">This paper presents an in-cylinder pressure measurement system for cycle-to-cycle feedback combustion control purposes. Such a system uses off-the-shelf components to measure cylinder pressure and performs user-defined algorithms for heat release analysis. The working principle of the device is discussed as well as the simplifications for heat release analysis required for fast computation. The system is benchmarked against a commercially-available combustion analyzer in order to quantify the accuracy and time response. The results showed that the system is satisfactorily accurate for combustion phasing control. The main advantage, however, comes from the reduction of calculation and communication delays observed in the commercially-available system. This enables the use of cycle-to-cycle cylinder pressure-based feedback control algorithms. The functionality of such a device is demonstrated in a spark-ignition experimental engine fitted with an externally cooled exhaust gas recirculation (EGR) loop. Here, an optimal combustion phasing was the target for a feedback combustion controller that automatically adjusted the spark advance. The favorable results proved the system suitable not only for this particular combustion control problem with EGR but also for many of the modern combustion control strategies in gasoline and diesel engines.</div></div>

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Feasibility and Calibration Considerations for Selection of Combustion Control Features

Cited by 2 publications

References 16 publications

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

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

Portable In-Cylinder Pressure Measurement and Signal Processing System for Real-Time Combustion Analysis and Engine Control

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