Model-based quantitative feedback control of EGR rate and boost pressure for turbocharged diesel engines

Abstract

This paper proposes a closed loop multivariable VGT/EGR control system for a turbocharged diesel engine. The control system is synthesized based on quantitative feedback theory to maintain robust stability and performance in the presence of model variations via sequential MIMO loop-shaping. Simulation results from a turbocharged diesel engine are included to illustrate the effectiveness of the proposed control design.

Quantitative feedback design of air and boost pressure control system for turbocharged diesel engines

“…Therefore, W(s) if designed as a direct inverse of G(s) would be an unstable compensator, which it is not desirable. (Wang, Haskara, & Yaniv, 2008) proposes a method for the design of a stable dynamic weighting matrix W(s) based on a reduced order model of G(s). For a gain-scheduled implementation of W(s) in real time, their computation is quite complicated.…”

Robust Control Approach on Diesel Engines With Dual-Loop Exhaust Gas Recirculation Systems

“…There are slight disadvantages for the process of Equation (43) where finding the optimal controller may converge to a local optimum as each iteration is dependent on finding the optimal solutions using K or D. The DK iteration can also lead to a computationally intensive controller as it will be at least the order of the plant G, plus the order of the weights, plus the order of the scaling matrix D.…”

“…43. This indicates that the gain of the complex air-path may change by up to 3.43 times depending on the direction of the input vector direction.…”

“…The feed-forward controller is based on the inverted, steady-state, mean value approximations of Equations (1) through(9). Similar feed-forward and MIMO feedback air-path control schemes have been effectively used in[29] and[43]. MIMO feedback control will still be necessary to maintain both steady-state and dynamic performance due to errors naturally inherent in the mean value approximations.…”

Decentralized robust control-system for a non-square MIMO system, the air-path of a turbocharged Diesel engine

“…[Murilo, A. et al, 2011] proposed a multivariable control strategy based on a parameterized nonlinear model predictive control approach. Nonlinear continuous-time generalized predictive control was presented in [Dabo, M. et al, 2008] [Wang, Y. et al 2008]. Most works presented above use not the throttle as a third actuator.…”