Optimal Catalytic Converter Heating in Hybrid Vehicles

2014-01-1351

04/01/2014

Event
SAE 2014 World Congress & Exhibition
Authors Abstract
Content
In this paper, a hybrid optimal control problem (HOCP) for the optimal heating of the three-way catalytic converter is solved. We propose a model for a hybrid vehicle that beneath State of Charge and fuel consumption includes thermal system states like engine cooling water temperature and catalytic converter temperature. Since models for noxious emissions with appropriate computational demand are not yet available for optimization purposes, an artificial state that resembles the emissions produced is introduced. A hybrid optimal control problem is then formulated for the beginning of the FTP-75 drive cycle whose target is to minimize the energy loss during the catalytic converter and engine cooling water heating phase. The corresponding input values to be optimized are continuous variables as ignition angle and cylinder charge as well as discrete decisions such as different injection schemes. As additional constraint, an upper limit is imposed on the artificial emissions state. A self-developed algorithm is then used to optimize the system with respect to the constraints and results are presented accordingly. The results obtained provide a valuable help for the calibration of the catalytic heating process and to obtain a solution that fulfills today's complex legal requirements.
Meta TagsDetails
DOI
https://doi.org/10.4271/2014-01-1351
Pages
10
Citation
Schori, M., Boehme, T., Jeinsch, T., and Schultalbers, M., "Optimal Catalytic Converter Heating in Hybrid Vehicles," SAE Technical Paper 2014-01-1351, 2014, https://doi.org/10.4271/2014-01-1351.
Additional Details
Publisher
Published
Apr 1, 2014
Product Code
2014-01-1351
Content Type
Technical Paper
Language
English