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Updated: Jun 9, 2025

Original Experimental Approach for Assessing Transport Fuel Stability
Published on: October 21, 2016
Optimal control of Hydrocarbon Reducer (HC) injection based on Trust-Region-Reflective Algorithm (TRRA) and physical
Wenlong Liu1, Ying Gao1, Yuelin You1
1State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China; College of Automotive Engineering, Jilin University, Changchun 130025, China.
Optimizing hydrocarbon injection into the Diesel Oxidation Catalyst (DOC) precisely controls its outlet gas temperature for Diesel Particulate Filter (DPF) active regeneration. This method ensures efficient and accurate DPF cleaning.
Area of Science:
- Automotive Engineering
- Chemical Engineering
- Environmental Science
Background:
- Diesel engines require effective emission control systems, including Diesel Oxidation Catalysts (DOCs) and Diesel Particulate Filters (DPFs).
- Active regeneration of DPFs necessitates precise control of DOC outlet gas temperature to optimize performance and prevent damage.
- Hydrocarbon (HC) injection is a key factor influencing DOC temperature during active regeneration.
Purpose of the Study:
- To develop and validate a control strategy for maintaining the DOC outlet gas temperature within a narrow range (600 ± 15 °C).
- To optimize hydrocarbon (HC) injection for efficient active regeneration of the downstream Diesel Particulate Filter (DPF).
Main Methods:
- Developed a simplified physical model of DOC thermal dynamics, solving energy conservation equations using the TR-BDF2 method.
- Optimized model parameters with the Gauss-Newton method for improved computational efficiency and accuracy.
- Designed a DOC downstream temperature observer using the Unscented Kalman Filter (UKF) algorithm.
Main Results:
- The TR-BDF2 method and Gauss-Newton optimization significantly enhanced computational efficiency and accuracy of the DOC thermal model.
- The UKF-based observer accurately estimated DOC temperature under both steady-state and transient conditions (WHTC cycle).
- Successful control of HC injection maintained DOC outlet temperature at 600 ± 15 °C, achieving the target for DPF regeneration.
Conclusions:
- The proposed model and observer provide a reliable method for precise DOC temperature control.
- Optimized HC injection strategy effectively supports active DPF regeneration, enhancing diesel engine emission control.
- This research offers valuable theoretical and practical insights for advanced diesel emission aftertreatment systems.
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