Advanced Model-Based Closed-Loop Control Strategies for Internal Combustion Engines with Flex-Fuel Capability
2022-01-0491
03/29/2022
- Content
- Meeting future limits for greenhouse gas (GHG) and pollutant emissions represents major challenges for the further development of internal combustion engines for light and heavy-duty applications. To comply with all standards, the use of E-Fuels is an important option due to their great potential in terms of energy density, sustainability and low-pollution combustion. However, the increased fuel diversity associated with their use increases the complexity of the powertrain development and calibration process, resulting in an increase in development time and cost. To address these challenges, advanced model-based closed-loop control strategies are applied to optimize the fuel- and air-path settings and make best use of the properties of the different fuels. Key to this approach is the use of a physical fuel energy balance-based feedforward control in combination with the closed-loop control of combustion parameters such as the indicated mean effective pressure, the center of heat release, and the combustion noise excitation. In addition, a model based closed-loop NOx control could simplify the calibration on the air-path side. Such a closed-loop approach can further be used for learning functions that eventually allow switching to optimal setpoints and/or correct setpoints based on the fuel properties. This publication presents an evaluation of this model-based calibration approach for the optimization of a modern Diesel engine running on a synthetic fuel (1-Octanol/Diesel blend). The control strategy is implemented on a demonstrator vehicle built up with a Rapid Control Prototyping (RCP) system. The results of emission test cycles with conventional Diesel fuel and later with the Diesel-Octanol blend are presented to illustrate the potential of the novel control concept. Moreover, the concept of setpoint adaptation with fuel detection and its advantages are discussed. * The project on which this report is based was funded by the German Federal Ministry of Economics and Energy with the number 19I18006. The authors are responsible for the content of this publication.
- Citation
- Srivastava, V., "Advanced Model-Based Closed-Loop Control Strategies for Internal Combustion Engines with Flex-Fuel Capability ," SAE Technical Paper 2022-01-0491, 2022, .