Simulation and Design of Decentralized PI Observer Based Controller for Nonlinear Interconnected Systems of the Diesel Engine Airpath

Kamath, Rohith; Venkobarao, Vivek; Subramaniam, C. K.

doi:10.1016/j.egypro.2017.05.103

Cited by 2 publications

(1 citation statement)

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“…For a minimization problem, stop simulation based on convergence criteria defined in (46), where the value of ϵ is usually −2.5. 27 In addition, mathematical techniques namely: eigen value analysis, 28 large signal analysis 32 are also performed to assure a guaranteed stability of the solver as well as reduced nonlinear model.…”

Section: Solution Spacementioning

confidence: 99%

Development and validation of nonlinear dynamic engine airpath models for real-time advanced control application

Kamath

Kopold²,

Venkobarao³

et al. 2021

International Journal of Engine Research

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This paper proposes model reduction techniques for reducing engine airpath models in real-time (RT), for a control oriented application in an engine equipped with high pressure exhaust gas recirculation (EGR-HP) and single stage turbocharger. There are two major challenges addressed by authors: First, reducing the order without compromising the performance in terms of accuracy by decoupling the nonlinear coupled differential equations of airpath system in-order to use them in real-time processor-in-loop control application. A model reduction technique based on different dynamic characteristics between thermodynamic states followed by semi-implicit Euler (SIE) numerical method to solve coupled dynamic multi-input multi-output (MIMO) differential equation models is demonstrated. Second, the authors have proposed a novel method to calculate gas mass flow via compressor, coupled with engine airpath model in real-time. The proposed models of airpath system coupled with turbocharger models for a diesel engine is validated with experimental data to evaluate performance of pressures, temperatures, mass flows at relevant components. The developed airpath model is used for calculating thermodynamic properties in real-time for state of art engine control unit (ECU) in production engine and become basis for feedforward as well as closed loop control of airpath variables for real-time system. Authors further propose to use this modeling approach for calculating airpath system variables for exhaust aftertreatment system, injection system, and for virtualization of sensor values in airpath systems.

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