Diesel Engine Transient NOx and Airpath Control using Rate-based Model Predictive Controller

Duraiarasan, Saravanan; Stefanopoulou, Anna G.; Middleton, Richard H.; Salehi, Rasoul; Mahesh, Siddharth; Allain, Marc

doi:10.1016/j.ifacol.2021.10.135

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…Second, a constrained case is evaluated, in which the engine-out NO X constraint is tightened, and now the controller must track the same reference intake manifold pressure P im ref as before, while satisfying the time-varying engine-out NO X constraint N O X cstr . Note that Duraiarasan et al 21 presents the simulation and the experimental validation of the low-level controller which is a standalone predictive intake manifold pressure controller with NO X constraints. However, this section in this paper presents the low-level controller in a hierarchical setup and this section on low-level controller is pertinent to compare the key differences against the high-level controller like the cost functions, prediction horizons, the linear and the non-linear airpath models.…”

Section: Low-level Controller: Air Path Predictive Controllermentioning

confidence: 99%

Hierarchical multi-time-scale predictive thermal management and fuel optimization for heavy-duty compression ignition engines

Duraiarasan

Salehi

Mahesh

et al. 2023

International Journal of Engine Research

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For heavy-duty diesel engines, NOX emissions reduction is strongly constrained by fuel efficiency. This paper presents a hierarchical model predictive controller (H-MPC) for coordinated control of tailpipe NOX emissions and fuel consumption. The H-MPC uses the separation of slow and fast dynamics that exist in the engine and its aftertreatment system. The controller is synthesized with an architecture in which a high-level MPC uses a longer prediction horizon compared to the low-level predictive controller which tracks the high-level controller command and manages the thermal dynamics of the aftertreatment system. Engine load preview enables the high-level controller to estimate the desired catalyst temperature ahead of time and addresses the selective catalytic reduction (SCR) slow thermal dynamics. Calculated by the high-level controller, the intake manifold pressure, and the start of injection (SOI) crank angle is used as reference trajectories in the low-level controller that regulates fast dynamical behaviors such as engine out NOX emissions. Hardware-in-the-loop (HIL) validation of this integrated H-MPC on a rapid prototype controller shows that when the SCR catalyst temperature is above light-off temperature (warmed-up condition), the engine operation is shifted to operate with the best fuel economy since the warmed-up SCR can efficiently reduce the engine-out NOX emissions. Results indicate that up to 0.8% benefit in cycle averaged BSFC along with a 13% reduction in tailpipe NOX compared to a stock engine calibration can be achieved with the coordinated engine and aftertreatment system through H-MPC.

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