Adaptive time delay compensation for air-fuel ratio control of a port injection SI engine

Excess Air Ratio Management in a Diesel Engine with Exhaust Backpressure Compensation

“…This real-time λ determination method ensures sufficient accuracy (errors typically do not exceed 3%) [ 9 ], while the use of the same hardware offers the additional advantage of combustion timing determination [ 10 ]. For UEGO sensors, the relatively long feedback delay problem is usually solved by various adaptive compensation algorithms incorporating Smith predictors [ 11 , 12 ] or other feed-forward/feed-back systems [ 13 ]. Furthermore, individual cylinder λ control can be realized with a single UEGO sensor located at the common exhaust runner, while signal delay is dealt with by means of simplified gas transport and mixing models [ 14 ].…”

Air–fuel ratio control of lean‐burn SI engines using the LPV‐based fuzzy technique

“…Further, in [6, 7], an adaptive internal model control for AFR control was proposed to adapt the unknown time constant of the system plant with a time‐varying delay (that makes the AFR system a parameter dependent system), and uncertain disturbances. Recently, Khajorntraidet et al [8] proposed an adaptive algorithm with Smith predictor to estimate the time delay in port injection engines. The above studies all adopted adaptive control strategies for AFR control.…”