Sliding-mode control of automotive selective catalytic reduction systems with state estimation

Yao Ma, Junmin Wang

Research output: Contribution to journalArticlepeer-review


<jats:p> A sliding-mode controller for an automotive selective catalytic reduction system is designed to drive its ammonia surface coverage ratio to the target level. The proposed controller only requires NO<jats:sub>x</jats:sub>, temperature and air flow sensor measurement installed on most mass production vehicles. Selective catalytic reduction systems have been widely equipped on diesel-powered ground vehicles to remove excessive NO<jats:sub>x</jats:sub> emissions. The tradeoff between NO<jats:sub>x</jats:sub> removal efficiency and ammonia slip poses a control challenge on regulating the ammonia surface coverage ratio to a proper level in the presence of disturbance. In this study, a sliding-mode controller is designed with explicit consideration of measurement noise and actuator saturation. The finite time convergence of tracking error is proved by a Lyapunov approach. For implementation purpose, an observer of ammonia surface coverage ratio and ammonia slip is also designed to p
Original languageEnglish
Pages (from-to)630-644
JournalDefault journal
StatePublished - Feb 2020


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