Bieniek, Mitchell (University of Michigan - Ann Arbor), Stefanopoulou, Anna G. (Univ Of Michigan), Hoard, John (University of Michigan - Ann Arbor), Maldonado, Bryan (University of Michigan), Fulton, Brien (Ford Research Labs), van Nieuwstadt, Michiel J. (Ford Research Labs)

Retard to the Limit: Closed-Loop COVIMEP Control for Aggressive Exhaust Heating

Scheduled for presentation during the Invited Session "Combustion Engine Control" (ThAT2), Thursday, June 27, 2019, 10:50−11:10, Chenonceau

9th IFAC International Symposium on Advances in Automotive Control, June 23-27, 2019, Orléans, France

This information is tentative and subject to change. Compiled on April 23, 2024

Abstract

During cold-starts, diesel engines equipped with aftertreatment systems typically use combustion phasing retard to increase exhaust gas enthalpy to hasten catalyst light-off, resulting in lower tailpipe emissions. Although later combustion phasing can help achieve faster catalyst light-off, combustion variability increases which can physically manifest as vibration and erratic engine behavior. To achieve faster catalyst light-off while remaining within combustion variability constraints, the premise of closed-loop control of Coefficient of Variation of IMEP (COVIMEP) to a target value using feedback from an in-cylinder pressure sensor has been explored. COVIMEP controllers have been designed using a model and validated via simulation and experiment at steady-state. The simulation and experimental results indicate that closed-loop COVIMEP control is a viable technique for retarding combustion phasing to the combustion variability limit at steady-state conditions.